Skocz do pozycji: 1.

Tytuł:

Removal of reactive yellow dye 145 from wastewaters over activated carbon that is derived from Iraqi kehdrawy date palm seeds

Autorzy:

Esmael, Hussein A.
Lafta, Abbas J.
Nema, Noor A.
Kahdum, Salih H.
Mousa, Abdulazeez A.
Abdali, O. Karar

Powiązania:

https://bibliotekanauki.pl/articles/1193943.pdf

Data publikacji:

2015

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Activated carbon
Activated charcoal
Adsorption over activated carbon
Textile dyes
activated carbon
date palm seeds
linear Freundlich
linear Langmuir

Opis:

This work involves synthesis of activated carbon from Iraqi date palm seeds as agricultural wastes using kehdrawy palm seeds. The preparation was conducted by chemical activation method using ZnCl2 as an activator. The synthesized activated carbon (AC) was characterized by different analytical and spectroscopic methods. This involves using scanning electron microscopy (SEM), flourier transformation infrared (FTIR), ash content, adsorption capacity, the percentage of humidity and the point zero charge (PZC). The activity of the prepared activated carbon was investigated by following the removal of reactive yellow 145 dye (RY 145) from the aqueous solutions. For a comparison a sample of non- activated carbon (NAC) was used in the same process. From the obtained results it was found that AC was more efficient in dye removal in comparison with NAC under the same conditions

Źródło:

World Scientific News; 2015, 21; 77-89
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Impact of preparation and storage of activated carbon on the high pressure sorption of CO2

Autorzy:

Lutyński, M.

Powiązania:

https://bibliotekanauki.pl/articles/200536.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

activated carbon
sorption
carbon dioxide

Opis:

Adsorption of carbon dioxide on activated carbons has become extremely interesting in the field of energy and environment. Activated carbon is either used as a model to understand sorption processes on coals as a part of research on CO2 geological storage/Enhanced Coalbed Methane or as an adsorbent for processes such as natural gas treatment or CO2 separation from flue gas. The paper presents results of high-pressure CO2 sorption at the temperature of 318K on two similar activated carbons (Filtrasorb 400 and WAZ 0.6-2.4 mm) where one sample of WAZ was not subjected to any pretreatment procedure. Experimental results were fitted with three parameter Langmuir and therefore it was possible to calculate CO2 adsorbed phase densities. The WAZ activated carbon has a slightly lower sorption even though it was pretreated with the same procedure. The untreated sample of WAZ exhibited sorption which was lower over 15%. Calculated adsorbed phase densities differ between the activated carbons and the lowest value was obtained for the untreated WAZ sample (21.0 mol/dm3).

Źródło:

Bulletin of the Polish Academy of Sciences. Technical Sciences; 2014, 62, 1; 113-119
0239-7528

Pojawia się w:

Bulletin of the Polish Academy of Sciences. Technical Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Adsorption of Naproxen Sodium from Aqueous Solutions on Commercial Activated Carbons

Autorzy:

Lach, Joanna
Szymonik, Anna

Powiązania:

https://bibliotekanauki.pl/articles/123683.pdf

Data publikacji:

2019

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

naproxen sodium
activated carbon
adsorption

Opis:

The pollution of surface and drinking water with pharmaceuticals is one of the growing problems. One of the groups used in large quantities involves nonsteroidal anti-inflammatory drugs which can be bought without a prescription. This group includes naproxen, which was identified in wastewater, surface water and even drinking water all over the world. The aim of the study was to assess the opportunities for the removal of naproxen sodium from water using carbon sorbents. The measurements were carried out for three commercial microporous (WG-12 and F-300) and micro-mesoporous (ROW 08 Supra) activated carbons. The kinetics and statics of adsorption were studied. The adsorption from solutions with pH from 6 to 10 and temperature from 20°C to 40°C was analysed. It was found that the higher the pH, the lower the adsorption and the higher the temperature, the greater the adsorption of naproxen sodium. The highest adsorption of naproxen sodium was obtained for the F-300 activated carbon, whereas the lowest – for the ROW 08 Supra activated carbon. It was found that the adsorption results depend on many factors, the most important of which include hydrogen bonds between carboxyl groups of naproxen sodium and phenolic groups on the surface of activated carbons and electrostatic repulsion between the anions of naproxen sodium and negatively charged the surface of the activated carbon. The results of adsorption kinetics were described with the following models: pseudo-first order and pseudo-second order, intraparticle diffusion, and Elovich. The highest values of correlation coefficient R² were obtained for the pseudo-second order and Elovich model. The results of adsorption statics were described using the Freundlich, Langmuir, and Temkin models. A good match between isotherms and the obtained results was obtained for the Freundlich and Temkin equations. It was found based on the adsorption intensity 1/n and distribution coefficient R_L that this process was beneficial for all the considered activated carbons and the investigated adsorption conditions.

Źródło:

Journal of Ecological Engineering; 2019, 20, 10; 241-251
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Application of Powdery Activated Carbons for Removal Ibuprofen from Water

Autorzy:

Puszkarewicz, A.
Kaleta, J.
Papciak, D.

Powiązania:

https://bibliotekanauki.pl/articles/124366.pdf

Data publikacji:

2017

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

ibuprofen
adsorption
powdery activated carbon

Opis:

The paper presents the results of studies on the use of adsorptive properties of selected powdered activated carbons (Norit SA Super and Carbopol MB5) for removal of ibuprofen from water. The tests were performed on non-flow conditions, series depending on the type and dose of powdered adsorbents. The research was carried out on a model solution of ibuprofen at initial concentration C0 = 20 mg/dm³, at 20 °C. Froundlich and Langmuir adsorption isotherms were used. Lagergrene kinetic models (PFO) and Ho (PSO) were used to describe adsorption kinetics. Both carbons exhibited a higher affinity for the adsorbent at pH above 7. Norit SA Super was a better adsorbent, for which, the highest adsorption capacity q = 0.448 g/g was achieved with dose D = 35 mg/dm³. The effectiveness of adsorption (decrease of ibuprofen in water) was 78%. The total removal of ibuprofen was obtained for a dose of carbon D = 200 mg/ dm³. With respect to Carbopol, the highest adsorption capacity (q = 0.353 g/g) was achieved at a dose of 30 mg/dm³, resulting in a 53% efficiency. Studies have shown that both tested powdered activated carbons have contributed to effective cleaning of aqueous solutions containing ibuprofen.

Źródło:

Journal of Ecological Engineering; 2017, 18, 4; 169-177
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Adsorption Kinetics of Edamame Soybean Peel Activated Carbon in Reducing the Level of Phosphate

Autorzy:

Eri, Iva Rustanti
Pramudinta, Namira Kholifatul
Nurmayanti, Demes

Powiązania:

https://bibliotekanauki.pl/articles/2027815.pdf

Data publikacji:

2022

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

adsorption kinetics
activated carbon
phosphate

Opis:

Domestic wastewater, such as detergent wastewater, causes the increase of the phosphate level that strongly contributes to eutrophication. Adsorption is a method that can be used to reduce the levels of phosphate. The natural ingredients that can be made as activated carbon include edamame soybean peel, because it contains a lot of celluloses. This research aimed to analyze the adsorption kinetics and adsorption capacity of edamame soybean peel activated carbon in reducing the phosphate levels. Adsorption was carried out with batch method with various concentrations of adsorbate (2 mg/L, 4 mg/L, and 6 mg/L) and stirring time (3 hours, 6 hours, 9 hours, and 12 hours). The results showed that the highest adsorption capacity was found in 6 mg/L of adsorbate concentration and 6 hours of stirring time. The results were validated by the Langmuir isotherm and pseudo-second-order adsorption kinetics model. The Langmuir isotherm indicated that adsorption occurred in monolayer. The maximum adsorption capacity was 0.43509 mg/g and the constant of adsorption kinetics was 1.5558 g/mg•min. Activated carbon from edamame soybean peel successfully reduced the levels of phosphate. The increase of adsorption capacity was correlated with the increasing concentration of adsorbate and stirring time until the equilibrium.

Źródło:

Journal of Ecological Engineering; 2022, 23, 2; 97-107
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Utilization of spent dregs for the production of activated carbon for CO2 adsorption

Autorzy:

Serafin, J.

Powiązania:

https://bibliotekanauki.pl/articles/779998.pdf

Data publikacji:

2017

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

activated carbon
biomass
CO2 adsorption

Opis:

The objective of this work was preparation of activated carbon from spent dregs for carbon dioxide adsorption. A saturated solution of KOH was used as an activating agent. Samples were carbonized in the furnace at the temperature of 550°C. Textural properties of activated carbons were obtained based on the adsorption-desorption isotherms of nitrogen at −196°C and carbon dioxide at 0°C. The specific surface areas of activated carbons were calculated by the Brunauer – Emmett – Teller equation. The volumes of micropores were obtained by density functional theory method. The highest CO₂  adsorption was 9.54 mmol/cm³  at 0°C – and 8.50 mmol/cm³  at 25°C.

Źródło:

Polish Journal of Chemical Technology; 2017, 19, 2; 44-50
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Removal of Cadmium using Alkaline-Treated Activated Carbon from Leucaena Leucocephala Biomass

Autorzy:

Ibrahim, W. M. H. W.
Sulaiman, Nurul Syuhada
Amini, Mohd Hazim Mohammad
Kadir, W. R. A.
Mohamed, Mazlan
Ramle, Sitti Fatimah Mhd
Bilgin, Ugur
Rahman, Wan

Powiązania:

https://bibliotekanauki.pl/articles/2125550.pdf

Data publikacji:

2022

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

activated carbon
cadmium
Leucaena leucocephala
adsorption

Opis:

Water contamination that caused by heavy metals is a very common phenomenon in the industrial age. One of the popular way to treat metal contaminated water is by adsorption process using activated carbon as the adsorbent. This paper works on producing activated carbon by chemical means with impregnation ratios of NaOH:char (w/w) was predetermined at 1:1 (ACT1-1), 2:1 (ACT2-1) and 3:1 (ACT3-1) under activation temperature of 700°C. Considering the Leucaena leucocephala is a wildly, easy and fast grown species, with the availability throught the year, it was chosen to be used as the precursor. The properties of these activated carbons and its potential for cadmium removal from aqueus solution was analyzed. It was found that the highest surface area was recorded at 662.76 m²/g. Four parameters were studied which are contact time, the effect of pH, initial concentration of adsorbate and temperature. The equilibrium time was achieved in 40 min treatment at initial concentrations of 30 mg/l. The adsorbent exhibited good sorption potential for cadmium at pH 8.0 and equilibrium temperature of 30℃. Based on the results, this study had proved that activated carbon from Leucaena leucocephala biomass have the good potential to be used for removal of cadmium from wastewater.

Źródło:

Archives of Metallurgy and Materials; 2022, 67, 3; 1033--1036
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Reduction of Ammonia Nitrogen and Chemical Oxygen Demand of Fertilizer Industry Liquid Waste by Coconut Shell Activated Carbon in Batch and Continuous Systems

Autorzy:

Budianto, Agus
Pratiwi, Adelia Gita
Ningsih, Sapta Ayu
Kusdarini, Esthi

Powiązania:

https://bibliotekanauki.pl/articles/27323843.pdf

Data publikacji:

2023

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

activated carbon
waste
fertilizer
coconut shell

Opis:

The fertilizer industry laboratory produces urea and ammonia nitrogen waste that can harm living things in the surrounding water bodies. Urea, nitrogen, and ammonia can be reduced by adsorption using activated carbon. This research reduced urea nitrogen and ammonia through activated carbon adsorption with a batch and continuous system. Percentage indicator of urea and ammonia nitrogen removal through Ammonia Nitrogen (NH3-N) and Chemical Oxygen Demand (COD) NH3-N and COD analysis was determined. This study aimed to obtain: 1) the percentage of NH3-N and COD reduction in stem batch; 2) the percentage of NH3-N and COD reduction in the continuous system; 3) the Freundlich and Langmuir isotherm adsorption equation against NH3-N wastewater. They are testing the adsorption power of activated carbon in a batch system using variable levels of activated carbon: 40 g/L, 55 g/L, 70 g/L, 85 g/L, and 100 g/L and testing the adsorption power of activated carbon in a continuous system using the variable frequency of wastewater in contact with activated carbon filter cartridges, namely 2, 3, 4, 5, and 6 times. The results showed: 1) in the batch system NH3-N reduction of 98.26–98.82% and COD reduction of 92.53–97.05%; 2) in continuous system reduction of NH3-N of 86.05–88.07% and COD reduction of 93.91–97.05%; 3) Freundlich isotherm adsorption equation yields constant R2 0.9464, n 0.4482, KF 0.0616 mg/g; while Langmuir’s isotherm adsorption equation yields constant R2 0.8684, b -0.1046 L/mg, and qm 7.9872 mg/g.

Źródło:

Journal of Ecological Engineering; 2023, 24, 7; 156--164
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Zmiany właściwości węgli aktywnych po procesie ich modyfikacji
Changes in the properties of activated carbons on the process of modification

Autorzy:

Okoniewska, E.

Powiązania:

https://bibliotekanauki.pl/articles/125766.pdf

Data publikacji:

2014

Wydawca:

Towarzystwo Chemii i Inżynierii Ekologicznej

Tematy:

węgiel aktywny
modyfikacja
activated carbon
modification

Opis:

Techniczne węgle aktywne WG-12, ROW 08 Supra i F-300 poddano modyfikacji za pomocą pola ultradźwiękowego. Pierwszy z nich to węgiel WG-12 produkowany przez firmę Gryfskand z Hajnówki. ROW 08 Supra to granulowany i uszlachetniony węgiel aktywowany, który można regenerować termicznie. Produkowany jest z torfu przez holenderską firmę Norit metodą parowo-gazową. Charakteryzuje się dużą objętością porów i znacznym rozmiarem ziaren, co sprawia, że jest powszechnie stosowany do uzdatniania wody pitnej w celu polepszania smaku wody oraz usuwania zapachu, ozonu, chloru i mikrozanieczyszczeń (np. rozpuszczonych substancji organicznych czy pestycydów). Węgiel F-300 to węgiel ziarnowy produkowany przez belgijską firmę Chemviron Carbon. Badano węgle aktywne specjalnie modyfikowane za pomocą roztworu KMnO4. Ze względu na redukcyjny charakter powierzchni węglowej Mn7+, pochodzący z roztworu KMnO4, redukuje się do Mn4+, tworząc na jego powierzchni nierozpuszczalny MnO2. Zmodyfikowany w ten sposób węgiel aktywny może być stosowany do usuwania z wody manganu w niepożądanych ilościach. Celem pracy było wykonanie analiz wybranych wskaźników technicznych, takich jak gęstość nasypowa, liczba jodowa, liczba metylenowa i zawartość popiołu zgodnie z PN.
Technical activated carbons WG-12, ROW 08 Supra and F-300 were modified using ultrasonic field. The first is carbon WG-12 produced by block bags from Hajnowka. ROW 08 Supra is refined granulated activated carbon, which can be regenerated thermally, is produced of peat by the Dutch company NORIT by steam and gas. Characterized by high pore volume and a large grain size, which makes it widely used for drinking water treatment in order to improve the taste of water and removal of odor, ozone, chlorine and micropollutants (for example, organic solutes or pesticides). Coal F-300 is a carbon particle size distribution produced by the Belgian company Chemviron Carbon. Test specially modified activated carbon with a solution of KMnO4. Due to the reducing nature of the surface of the carbon derived from Mn7+ KMnO4 solution reduces to Mn4+ form on the surface of insoluble MnO2. This modified activated carbon can be used for removing manganese from water in undesirable amounts. The aim of this study was to perform analyzes of selected technical indicators, such as bulk density, iodine value, the number of methylene and ash content in accordance with Polish standards.

Źródło:

Proceedings of ECOpole; 2014, 8, 1; 250-254
1898-617X
2084-4557

Pojawia się w:

Proceedings of ECOpole

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Effectiveness of Carbon Monoxide Concentration Reduction on Active Carbon Contact System in Burning Polystyrene Foam

Autorzy:

Fikri, E.
Veronica, A.

Powiązania:

https://bibliotekanauki.pl/articles/123480.pdf

Data publikacji:

2018

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

polystyrene foam
particle size
activated carbon
carbon monoxide

Opis:

One of the wastes generated by PT Beton Elemenindo Perkasa is polystyrene foam waste. Processing of this type of waste is still done with open burning so it has an impact on health and the environmental quality degradation. One of the polystyrene foam waste processing technologies is by constructing a combustion furnace equipped with carbon filter. Activated carbon is one of the air filter media that can absorb harmful gases from the combustion process. The purpose of this research is to identify the effectiveness of carbon monoxide (CO) concentration reduction on active carbon contact system using variation of particle size. This research is a kind of an experimental study involving post test with control design. The number of samples was calculated based on the number of treatments and the number of repetitions in the study. This research used 2 kinds of treatment, including 20 mesh and 30 mesh in 9 repetitions. Independent T-Test statistical analysis showed a significant difference (p-value = 0.001) between the variation of particle size of activated carbon and the CO parameters with the average of the most effective reduction percentage on particle-sized active carbon of 30 mesh was 77.95%.

Źródło:

Journal of Ecological Engineering; 2018, 19, 4; 1-6
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Operating Parameters Effect on Adsorptive Desulphurisation Process of Diesel Oil

Autorzy:

Kalam, M. F.
Schütz, W.

Powiązania:

https://bibliotekanauki.pl/articles/342386.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Morski w Gdyni. Wydawnictwo Uniwersytetu Morskiego w Gdyni

Tematy:

desulphurisation
diesel oil
adsorption
activated carbon (AC)

Opis:

The vision of this research was to investigate the removal of thiophene sulphur compounds from high sulphur content (1.3%) diesel oil by adsorptive desulphurisation process using powdered activated carbon. The adsorptive desulphurisation process was performed under three different operating conditions such as amounts of activated carbon (g), treatment temperatures (°C) and stirring time (minutes). Results showed that these operating parameters influence the removal of sulphur compounds from diesel oil. The maximum desulphurisation obtained was 76.16%.

Źródło:

Zeszyty Naukowe Akademii Morskiej w Gdyni; 2018, 106; 41-47
1644-1818
2451-2486

Pojawia się w:

Zeszyty Naukowe Akademii Morskiej w Gdyni

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Modification of activated carbons for application in adsorption cooling systems

Autorzy:

Wolak, Eliza
Vogt, Elżbieta
Szczurowski, Jakub

Powiązania:

https://bibliotekanauki.pl/articles/298146.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie

Tematy:

activated carbon
hydrophobization
modification
heat of wetting

Opis:

In this paper commercially available activated WD-extra carbon (Gryfskand) which is applied for water treatment was used. Activated carbon was modified by the following chemical agents: H2O2, HNO3 and HCl. Chemical modifications significantly affect the chemical, structural and surface properties of activated carbons. Hydrophobization with ethereal stearic acid was performed on the raw material and samples after chemical modification. Hydrophobic properties of the samples were specified. The relationship of the chemical modification agents with hydrophobization degree was indicated. The thermal effects of wetting by methanol was measured. The heat of wetting was calculated. The purpose of the work was to modify the WD carbon properties to obtain an adsorbent for cooling systems characterized by both good thermal capacity and moisture resistance. The modifying chemical substances applied accounted for an increase in the concentration of the acid functional groups. The hydrophobized and HCl-modified WD(HCl) carbon has the best hydrophobized properties. The results of studies describing such modifications allow to conclude that the use of hydrophobic materials may lead to the production of sorbents with new functions facilitating their storage and use.

Źródło:

Technical Sciences / University of Warmia and Mazury in Olsztyn; 2019, 22(1); 87-98
1505-4675
2083-4527

Pojawia się w:

Technical Sciences / University of Warmia and Mazury in Olsztyn

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Modeling of the carbon in pulp (cip) process in gold cyanide leaching plants using the plant data

Autorzy:

Sayiner, B.

Powiązania:

https://bibliotekanauki.pl/articles/110084.pdf

Data publikacji:

2014

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

modeling
cyanide leaching
activated carbon
adsorption
gold

Opis:

An improved method to model CIP plants by plant data is presented. The Turkish gold cyanide leaching CIP plants, Bergama Ovacik, Gumushane Mastra and Eskisehir Kaymaz were modeled by using gold concentrations of monthly carbon, solution and solids spot samples of adsorption tanks without a need of laboratory work. Five carbon adsorption models were used namely k-n, Nicol-Fleming, Dixon, Film Diffusion with Langmuir isotherm and Film Diffusion with Freundlich isotherm (Johns model). Several monthly obtained plant data were collected and modeled separately and model parameters as well as regression coefficient R2 values were found by non-linear regression. By comparing R2 values, the best fit model for the three CIP plants was determined as Film Diffusion with Langmuir Isotherm that R2 values were above 0.95. Thus, by using the best fit model, the Kaymaz plant was optimized for existing 49 Mg per hour ore feed tonnage and plant parameters were predicted according to planned feed tonnage increase to 120 Mg per hour.

Źródło:

Physicochemical Problems of Mineral Processing; 2014, 50, 2; 841-852
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Improving the carbon dioxide uptake efficiency of activated carbons using a secondary activation with potassium hydroxide

Autorzy:

Zgrzebnicki, M.
Michalczyszyn, E.
Wrobel, R. J.

Powiązania:

https://bibliotekanauki.pl/articles/778515.pdf

Data publikacji:

2018

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

activated carbon
activation
pore size distribution
DFT

Opis:

Secondary activation of commercial activated carbon (AC) ORGANOSORB 10-CO was carried out at 600, 700 and 800°C with mass ratios of potassium to AC (K/AC) in range 1–3. Crucial samples have shown following CO₂  uptakes and SSA – 3.90 mmol/g and 1225 m²/g, 4.54 mmol/g and 1546 m²/g, 4.28 and 1717 m²/g for pristine material and samples obtained at 700°C with K/AC = 2 and at 800°C with K/AC = 3 respectively. Last sample also indicated significant mesopore volume increase in diameter range 2–5 nm, from 0.11 to 0.24 cm3/g. CO₂ uptake increase was explained by formation of micropores up to diameter of 0.8 nm, which distribution was established from CO₂  sorption using DFT. Surface chemistry of all samples has not changed during modification, what was proven by XPS. Moreover, deeper incorporation of potassium ions into graphite at higher temperatures was observed as confirmed with EDS, XPS and XRD.

Źródło:

Polish Journal of Chemical Technology; 2018, 20, 3; 87-94
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Activated carbons prepared from hazelnut shells, walnut shells and peanut shells for high CO2 adsorption

Autorzy:

Lewicka, K.

Powiązania:

https://bibliotekanauki.pl/articles/778748.pdf

Data publikacji:

2017

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

activated carbon
biomass
nutshells
CO2 adsorption

Opis:

Research treats about producing activated carbons for CO₂  capture from hazelnut shells (HN), walnut shells (WN) and peanut shells (PN). Saturated solution of KOH was used as an activating agent in ratio 1:1. Samples were carbonized in the furnace in the range of temperatures 600°C–900°C. Properties of carbons were tested by N2 adsorption method, using BET equation, DFT method and volumetric CO₂  adsorption method. With the increase of carbonization temperature specific surface area of studied samples increased. The largest surface area was calculated for samples carbonized at 900°C and the highest values of CO₂  adsorption had samples: PN900 at 0°C (5.5 mmol/g) and WN900 at 25°C (4.34 mmol/g). All of the samples had a well-developed microporous structure.

Źródło:

Polish Journal of Chemical Technology; 2017, 19, 2; 38-43
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

The Effect of Ozonation, Coagulation and Adsorption on Natural Organic Matter Removal

Autorzy:

Dąbrowska, Lidia

Powiązania:

https://bibliotekanauki.pl/articles/1955547.pdf

Data publikacji:

2021

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

ozone
activated carbon
polyaluminium chloride
trihalomethane precursor

Opis:

For the treatment of surface water, the coagulation process was used with highly alkaline polyaluminium chloride PAX-XL19F and coagulation supported by ozonation and adsorption on powdered activated carbon CWZ-30 for reducing the level of surface water pollution with organic substances. In addition to the typical indices used to assess the content of organic compounds (total organic carbon TOC, oxidisability OXI, ultraviolet absorbance UV254), the study also evaluated colour, turbidity, and the potential of trihalomethanes formation THM-PF. Reduction in the content of TOC in water after coagulation ranged from 22 to 24%, OXI in the range of 34-36%, and UV254 absorbance from 52-55%. The turbidity and colour of the water was reduced by 70-73% and 56-60%, respectively. The use of preliminary ozonation and activated carbon-assisted coagulation increased the efficiency of water treatment. Changes in the values of TOC, OXI, UV254 absorbance, turbidity and colour were 28-33%, 45-46%, 69-73%, 72-79% and 89-100%, respectively. In the water purified by coagulation and then chlorinated, THM-PF was 37-38% lower than in untreated surface water. The use of additional pre-ozonation and activated carbon during coagulation increased the reduction of THM-PF by 9-12%.

Źródło:

Journal of Ecological Engineering; 2021, 22, 9; 216-223
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Improved recovery of gold and silver from thiosulfate solution on activated carbon in presence of ammonium persulfate

Autorzy:

Mahmoud, Mohamed H. H.
Awad, Hesham M.

Powiązania:

https://bibliotekanauki.pl/articles/110611.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

activated carbon
adsorption
gold
silver
thiosulfate
ammonium persulfate

Opis:

Thiosulfate (TS) process for extraction of gold and silver is a promising alternative to the highly toxic cyanidation process. One of the main reasons caused limiting the practical application of the TS process is the poor recovery of gold and silver on the commonly used activated carbon (AC). Increasing amounts of TS ions greatly inhibited the adsorption of gold and silver from synthetic solutions. No adsorption was obtained when the TS concentration reached 0.8 M after 5 h. The adsorption efficiency from real leach liquor initially contained 0.2 M TS was as low as 40-50%, after a long time of 15 hours. We have suggested that the removal of the residual TS ions in leach liquor through an interaction with an oxidizing agent such as ammonium persulfate (APS) would improve the adsorption of gold and silver on AC. Increasing the APS concentrations from 0.0 M to 0.01 M drastically improved the gold adsorption efficiency from 5% to 85% after only 10 min. Almost 95% of both metals was adsorbed after 90 min. EDXRF chart confirmed the adsorption of gold and silver on AC. A process flowsheet was proposed for an integrated TS leaching and recovery of gold and silver from Al Amar tailing including adsorption on AC in presence of APS.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 5; 1271-1285
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Characteristics and Adsorption Test of Activated Carbon from Indonesian Bituminous Coal

Autorzy:

Kusdarini, Esthi
Budianto, Agus

Powiązania:

https://bibliotekanauki.pl/articles/2202119.pdf

Data publikacji:

2022

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

ammonium phosphate
coal
batik waste
activated carbon
chromium

Opis:

The fast-growing batik industry in Indonesia raises the problem of the waste containing chromium. One method to remove chromium is by the adsorption process using activated carbon. Activated carbon can be made from coal. This commodity is a mining mineral the availability of which is still abundant in Indonesia. This study aimed to obtain: 1) the best concentration of activator and activation temperature in the manufacture of activated carbon; 2) characteristics of activated carbon (moisture content, volatile matter content, ash content, fixed carbon content, iodine number, specific surface area, pore-volume, pore surface area, pore radius, and SEM photos); 3) % activated carbon removal for chromium and maximum adsorption capacity for chromium; 4) Freundlich and Langmuir isotherm adsorption equation of activated carbon to chromium. The manufacture of activated carbon was carried out by a carbonization process followed by a chemical and physical activation processes. The chemical activator was ammonium phosphate with doses of 74.5 g/L, 149 g/L, 223.5 g/L, and 298 g/L. Meanwhile, physical activation was carried out at 848 K, 948 K, 1048 K, and 1148 K. The next step was to test the adsorption capacity of activated carbon on artificial batik waste containing chromium. The results showed that: 1) activator concentration did not significantly affect the characteristics of activated carbon. Meanwhile, the optimal activation temperature is at a temperature of 1048 K and 1148 K, which can produce the activated carbon that meets the requirements of activated carbon of the Indonesian National Standard 06-3730-1995 with the following contents: air content 0.16–0.81%; volatile matter 14.62–19.31%; ash 6.48–9.97%; fixed carbon 70.60–75.79%; iodine number 1243.13–1258.65%; specific surface area 31.930 m2/g; activated carbon pore volume 0.011 cc/g; pore surface area 8.905 m2/g; activated carbon pore radius 30.614; 3) the proportion of activated carbon removal for chromium is 37–53% and the maximum adsorption capacity for chromium is 52 mg/g; 4) the Freundlich equation test resulted in a constant R2 of 0.5126, n 2.4870, KF 8.8818 mg/g, while the Langmuir equation test resulted in a constant R2 of 0.8897, b -0.0075 L/mg, qm -90.0901 mg/g.

Źródło:

Journal of Ecological Engineering; 2022, 23, 10; 129--138
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Wastewater Treatment Using Activated Carbon Produced from Oil Shale

Autorzy:

Hamdan, Mohmmad Ahmad
Sublaban, Esraa Taha
Al-Asfar, Jamil Jawdat
Banisaid, Mai Abdullah

Powiązania:

https://bibliotekanauki.pl/articles/2202355.pdf

Data publikacji:

2023

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

activated carbon
wastewater treatment
removing
heavy metal
water

Opis:

In recent years, many researchers have expressed interest in wastewater treatment using activated carbon produced from cheap raw materials. In this work, an activated carbo-aluminosilicate (ACS) – supported zero-valent iron (ZVI) composite was produced from Um AL-Rasa oil shale mine and examined to eliminate Chromium (VI) from contaminated water. Activation of raw oil shale fine particles (< 212 μm) was chemically performed using 95 and 5% wt of H2SO4 and HNO3, respectively, as activating agents. The activated material was further treated with caustic soda, named ACS, and modified with fine zero-valent iron particles < 212 μm), called ZVI/ACS composite. Kaolin was added to the composite with the ratio: (50 % wt. light kaolin: 50 % wt. ACS), named as ZVI/ACS/K. The XRD analysis for both composites confirmed iron dispersion at 45°. Adsorption experiments were carried out using the two adsorbents ZVI/ACS & ZVI/ACS/K under different values of pH, and adsorbent dosage. The results indicated that the reduction of Chromium was maximum under the 3 pH value and 2.0 gm amount of ZVI/ACS/K. Furthermore, it was found the removal rate was enhanced by 17% and 24.7% when ZVI/ACS & ZVI/ACS/K adsorbents were used, respectively, compared to that when only ACS adsorbent was used alone. Finally, the dependency of Chromium removal on its initial concentration by ZVI/ACS/K adsorbent was also investigated at two different temperatures of 27° and 50°. The results indicated a decrease in the removal rate of the Chromium as the concentration increased at 27°; however, the removal rate previously enhanced at 50° at all initial concentrations.

Źródło:

Journal of Ecological Engineering; 2023, 24, 2; 131--139
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Polyurethane Loaded with Vegetable Activated Carbon for Heavy Metals Removal from Water

Autorzy:

El Malti, Wassim
Hamieh, Mostafa
Noaman, Amer
El-Dine, Rim Nasser
Hijazi, Akram
Al-Khatib, Wassef

Powiązania:

https://bibliotekanauki.pl/articles/1955582.pdf

Data publikacji:

2021

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

activated carbon
adsorption
banana stem
heavy metals
polyurethane

Opis:

The heavy metals pollutants resulting from industrial wastewater are a major environmental problem due to their toxicity and non-biodegradability. Their removal became a trending environmental subject. The preparation of low-cost and eco-friendly adsorbents for industrial wastewater treatment has been widely investigated. Furthermore, the use of polymeric material for this purpose is highly increasing. In this study, banana stem agro-waste was valorized by preparing and characterizing its derived activated carbon used as a filler to improve the adsorption performance of polyurethane foams. The loaded polyurethane was synthesized in the shape of pellets, characterized by SEM, and tested in removing Pb2+ and Cu2+ from aqueous solutions. The effects of activated carbon filler concentration, number of filtering passes, and pH were examined. The loaded polyurethane demonstrated a good adsorption capacity that was enormously improved compared to the unloaded polymer. 77% Pb2+ and 40% Cu2+ removal were reached after one filtering pass only. The optimum pH was determined to be 4. After the 10th pass, and at any pH, almost 100% of the studied metals were eliminated. Rapid and straightforward selectivity and seawater deionization tests were carried out and confirmed the capacity performance of the prepared pellets in removing different aqueous ions.

Źródło:

Journal of Ecological Engineering; 2021, 22, 9; 99-110
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Calcium alginate/activated carbon/humic acid tri-system porous fi bers for removing tetracycline from aqueous solution

Autorzy:

Sun, Qinye
Zheng, Heng
Li, Yanhui
Li, Meixiu
Du, Qiuju
Wang, Cuiping
Sui, Kunyan
Li, Hongliang
Xia, Yanzhi

Powiązania:

https://bibliotekanauki.pl/articles/949364.pdf

Data publikacji:

2020

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

Sodium alginate
Humic acid
Activated carbon
Adsorption
Tetracycline

Opis:

In this study, activated carbon and humic acid powder were fixed by the cross-linking reaction of sodium alginate. Calcium alginate/activated carbon/humic acid (CAH) tri-system porous fibers were prepared by the wet spinning method and freeze-dried for the removal of tetracycline in aqueous solution. Subsequently, the morphology and structure of CAH fibers were measured by scanning electron microscopy (SEM) and the Brunauer-Emmett-Teller (BET) method. The effect of pH, contact time, temperature and other factors on adsorption behavior were analyzed. The Langmuir and Freundlich isotherm models were used to fit tetracycline adsorption equilibrium data. The dynamics data were evaluated by the pseudo-second-order model, the pseudo-second-order model and the intraparticle diffusion model. Thermodynamic study confirmed that the adsorption of tetracycline on CAH fibers was a spontaneous process.

Źródło:

Polish Journal of Chemical Technology; 2020, 22, 3; 9-16
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Modeling of experimental data for the adsorption of methyl orange from aqueous solution using a low cost activated carbon prepared from Prosopis juliflora

Autorzy:

Kumar, M.
Tamilarasan, R.

Powiązania:

https://bibliotekanauki.pl/articles/778002.pdf

Data publikacji:

2013

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

activated carbon
adsorption
isotherm
kinetics and methyl orange

Opis:

This paper presents the feasibility for the removal of methyl orange (MO) dye from aqueous solution using an activated carbon prepared from Prosopis juliflora bark. Batch adsorption experiments were carried out as a function of pH, contact time, adsorbate concentration, adsorbent dosage and temperature. The commonly applicable isotherms namely Freundlich and Langmuir equations are used for the prediction of isotherm parameters. A comparison of linear least-square method and a trial-and-error non-linear method are examined in Freundlich and Langmuir (Four forms) isotherms. The nature of adsorption isotherm feasibility was evaluated with dimensionless separation factors (RL). The dynamics of adsorption process was analyzed with Lagergren’s Pseudo-first order and Pseudo-second order kinetic equations. Thermodynamic parameters like the change in enthalpy (ΔHo), change in entropy (ΔSo) and change in Gibbs free energy (ΔGo) were evaluated and ΔGo shows a negative value whereas ΔHo shows the positive value indicating that the adsorption process was spontaneous and endothermic in nature. The functional group characterization of the adsorbent was done using Fourier transform infrared spectroscopy (FTIR). The thermal stability of activated carbon was analyzed using Thermo gravimetric analysis (TGA) and Differential thermal analysis (DTA).

Źródło:

Polish Journal of Chemical Technology; 2013, 15, 2; 29-39
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Adsorpcja z roztworów wodnych różnych form chromu
Adsorptions from Water Solutions Differents Forms of Chromium on the Five Activated Carbons

Autorzy:

Lach, J.

Powiązania:

https://bibliotekanauki.pl/articles/297207.pdf

Data publikacji:

2013

Wydawca:

Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej

Tematy:

adsorpcja
węgle aktywne
chrom
adsorption
activated carbon
chromium

Opis:

Tematem badań była ocena skuteczności adsorpcji chromu(III) oraz chromu(VI) z roztworów jednoskładnikowych oraz dwuskładnikowych, w których występują one równocześnie. Badania adsorpcji prowadzono z roztworów o pH 6, w których Cr(III) przyjmuje formy Cr(OH)2+ i Cr(OH)+2 , a Cr(VI) HCrO-4 i CrO2-4. Jony Cr(III) i Cr(VI) są więc w czasie adsorpcji niekonkurencyjne, ponieważ zajmują inne miejsca aktywne na powierzchni sorbentów. Istnieje jednak możliwość blokowania porów, a tym samym dostępu do miejsc aktywnych. W badaniach przeanalizowano wielkość adsorpcji Cr(III) i Cr(VI) z roztworów jednoskładnikowych oraz Cr(VI) z roztworów dwuskładnikowych na pięciu węglach aktywnych stosowanych w stacjach uzdatniania wody: F-100, F-300, WG-12, Picabiol, ROW 08 Supra. W większości przypadków (z wyjątkiem węgla WG-12) sorpcja kationów Cr(III) była większa niż anionów Cr(VI). Obecność w roztworze obok anionów Cr(VI) kationów Cr(III) wpłynęła pozytywnie na efekty adsorpcji. Uszeregowano badane węgle aktywne ze względu na wielkość adsorpcji kationów Cr(III) i Cr(VI) w stosunku do wielkości powierzchni właściwej i ilości ugrupowań kwasowo-zasadowych. Ustalono, że decydująca jest budowa chemiczna powierzchni węgla, a nie jego powierzchnia właściwa.
The topic of research was assessment of the effectiveness adsorptions of chromium (III) and chromium(IV) from monocomponents and binary solutions in which they are at the same time. The research was conducted from solutions the pH = 6 in which Cr(II) has forms Cr(OH)2+ and + 2 Cr(OH) , Cr(VI) has forms − 4 HCrO and 2 4 CrO . Ions Cr(III) and Cr(VI) during the process of adsorptions are noncompetitive because they have different active locations on sorbents area. However there is possibility to block the porous thus access to active locations. In the research analysed amount of adsorptions Cr(III) and Cr(VI) from monocomponents solutions and Cr(VI) with policomponents solutions on the five activated carbons use in water treatment plant: F-100, F-300, WG-12, Picabiol, ROW 08 Supra. The most of cases (except for carbon WG-12) the sorptions of cations Cr(III) was larger quantity than anions Cr(VI). Presences in solutions next to anions Cr(VI) cations Cr(III) have a positive impact on adsorption effects.

Źródło:

Inżynieria i Ochrona Środowiska; 2013, 16, 3; 397-403
1505-3695
2391-7253

Pojawia się w:

Inżynieria i Ochrona Środowiska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Efficient removal of imidacloprid pesticide by two eco-friendly activated carbons

Autorzy:

Mohammad, Somaia Gaber
El-Refaey, Ahmed A.

Powiązania:

https://bibliotekanauki.pl/articles/27312663.pdf

Data publikacji:

2023

Wydawca:

Instytut Technologiczno-Przyrodniczy

Tematy:

activated carbon
hazelnut
imidacloprid
pesticide
regeneration
removal
walnut

Opis:

In this study, the removal of imidacloprid (IMD) pesticide onto activated carbon produced from nut shells of hazelnut (HAC), and walnut (WAC) has been investigated. The prepared activated carbons were characterised by total carbon, nitrogen and hydrogen content, surface areas and pore volume. Fourier-transform infrared (FTIR), and scanning electron microscopy (SEM) were studied before and after adsorption experiments. Effects of adsorbent dose (0.02-0.2 g), contact time (10-120 min), initial imidacloprid concentration (10-100 mg∙dm-3), and pH (1-8), and temperatures (25-50°C) on the removal of IMD pesticide by HAC and WAC in the batch mode were studied. The removal percentage of imidacloprid pesticide by HAC and WAC was 93.79% and 94.72%, respectively. The study showed that the pseudo-second-order kinetics model fitted well for both activated carbons. Moreover, adsorption isotherm results were evaluated using Freundlich, Langmuir and Temkin isotherm models. The adsorption results correlated well with the Langmuir isotherm model (R2 = 0.987 and 0.964) with maximum adsorption capacities of 76.923 and 83.333 mg∙g-1 for HAC and WAC, respectively, and an equilibrium time within 120 min. The nature of the adsorption of imidacloprid pesticide onto HAC and WAC is exothermic, spontaneous and physical in nature. The two prepared activated carbons (HAC, WAC) were successfully regenerated for three cycles and could be used as an effective and low-cost adsorbent for the removal of IMD pesticide from aqueous solutions. The production of the activated carbons of HAC and WAC will provide minimisation of these wastes in the environment.

Źródło:

Journal of Water and Land Development; 2023, 57; 220--230
1429-7426
2083-4535

Pojawia się w:

Journal of Water and Land Development

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Adsorption behaviour of polar solvent and water vapours on Sorbonorit B4 activated carbon

Autorzy:

Downarowicz, Dorota
Gabruś, Elżbieta

Powiązania:

https://bibliotekanauki.pl/articles/27315673.pdf

Data publikacji:

2023

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

adsorption
activated carbon
isotherms
isosteric heat
column studies

Opis:

In this work, the affinity of the heterogeneous Sorbonorit B4 (SB4) activated carbon toward methyl ethyl ketone (MEK), isopropyl alcohol (IPA), n-propyl alcohol (NPA) and isobutyl alcohol (IBA), and water vapours was examined. Adsorption equilibrium measurements demonstrate a higher adsorption capacity of water vapour than organic compounds at relative pressures above 0.4. The adsorption capacities of SB4 at the same vapor pressure followed the order: NPA> IPA> MEK> IBA. The Langmuir, Dubinin-Radushkevich, Dubinin-Astakhov, and Toth isotherm models were chosen to describe experimental results. Based on the multi-temperature isotherms, the values of the isosteric heat of adsorption were determined for various adsorbate loading. The results indicate a strong influence of VOC molecule structures and the surface heterogeneity of SB4 on the adsorption efficiency. For IPA-SB4 pair, the maximum temperature rise in a fixed-bed bed in the adsorption process and the energy requirement for regeneration were calculated and experimentally verified.

Źródło:

Polish Journal of Chemical Technology; 2023, 25, 4; 28--35
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 26.

Tytuł:

Activated Carbon as a Support of Catalysts for the Removal of Nitrogen Oxides

Autorzy:

Białas, Anna
Szlendak, Joanna
Czosnek, Cezary
Motak, Monika

Powiązania:

https://bibliotekanauki.pl/articles/127578.pdf

Data publikacji:

2020

Wydawca:

Polskie Towarzystwo Mineralogiczne

Tematy:

activated carbon
functionalisation
catalyst
metal oxides
nitrogen oxides

Opis:

Activated carbon was oxidised with concentrated nitric acid and impregnated with urea to form nitrogen-containing groups. Such a support was impregnated with cobalt, copper or silver nitrates to obtain catalysts for the selective catalytic reduction of nitrogen oxides with ammonia. Infrared spectra confirmed the formation of carboxylic and other organic oxygen-containing groups during oxidation. Nitrogen-containing species resulted from urea thermal decomposition. The metal-containing samples were hydrophilic. Cobalt and copper were present in the samples as small Co3O4 and CuO crystallites, while silver occurred in the form of large metallic crystallites, as seen from the X-ray diffraction patterns. Low temperature N2 sorption revealed that all samples were microporous solids, and the chemical and thermal treatment did not change their textural properties. The copper admixture caused the highest NO conversion, but worsened the selectivity and thermal stability of functionalised carbon support.

Źródło:

Mineralogia; 2020, 51, 1; 9-16
1899-8291
1899-8526

Pojawia się w:

Mineralogia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Utilization of activated carbon of various charcoal types as absorbent in green shellfish (Perna viridis, Linnaeus, 1758) contaminated by lead heavy metal

Autorzy:

Yustindriarini, Vidya
Hasan, Zahidah
Hamdani, Herman
Sahidin, Asep

Powiązania:

https://bibliotekanauki.pl/articles/1076152.pdf

Data publikacji:

2019

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Activated Carbon
Green Shell
Lead
Perna viridis
Skeletonema

Opis:

Aims of the research are to determine the type of activated carbon with high absorption rate in absorbing heavy metals of lead in green shells. This research used experimental method with complete randomized design then analyzed used analysis of variance and duncan test to see the decrease of lead in green shells by using different charcoal filters. The results showed that the highest decrease in green shell was by using coconut shell activated filter are 0,28 with a decrease percentage of 36,51%. The best lead decrease in water maintenance coconut shell activated filter treatment are 0,33 ppm. The coconut shell activated charcoal has a low ash content compared to other types and large pore charcoal size. Factors that supporting the metal absorption by charcoal include ash content on charcoal, charcoal pores, carbon concentration and pH concentration. Water quality measurements were measured in the morning and evening as supporting parameters in the study. Water quality measurements are in a range that can still be tolerated by green shells. Based on these results it can be concluded that the use of coconut shell activated charcoal is the best type of charcoal in lowering lead in green shells.

Źródło:

World Scientific News; 2019, 116; 157-168
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Preparation of activated carbon from the biodegradable film for CO2 capture applications

Autorzy:

Serafin, J.
Antosik, A. K.
Wilpiszewska, K.
Czech, Z.

Powiązania:

https://bibliotekanauki.pl/articles/949409.pdf

Data publikacji:

2018

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

biodegradable film activated carbon
adsorption
CO2
capture

Opis:

In this work for the first time, activated carbons were prepared from carboxymethyl fi lm (low-cost carboxymethyl fi lm waste), using chemical activation with potassium hydroxide. The samples were characterized by nitrogen adsorption-desorption at 77 K, XRD, SEM methods. The high values of the specifi c surface area and total pore volume were achieved and were equal to 2064 m2/g and 1.188 cm3 /g, respectively. Waste from the fi lm can be immediately utilized without CO2 production. This is the environmentally friendly way of waste utilization. Through this process, we can protect our environment. This study showed that the activated carbon obtained from carboxymethyl fi lm waste can be used as a good adsorbent for CO2 adsorption.

Źródło:

Polish Journal of Chemical Technology; 2018, 20, 3; 75-80
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Usuwanie barwnika pąsu kwasowego 4R z roztworów wodnych na węglach aktywnych
Removal of the dye of acid bright red 4R from water solutions on activated carbons

Autorzy:

Okoniewska, E.

Powiązania:

https://bibliotekanauki.pl/articles/296947.pdf

Data publikacji:

2016

Wydawca:

Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej

Tematy:

dyes
adsorption
activated carbon
barwniki
adsorpcja
węgiel aktywny

Opis:

Dyes are compounds widely applied in the different branches of industry, such as: paint, textile, cosmetic, paper, leather, food and other industries. Presence of dyes in water, even in ultralow concentrations, can negatively influence life of organisms in this environment. There are many methods of dye removal: chemical oxidization, coagulation, membrane processes, ionic exchange and also process of adsorption. It is possible to increase the capacity of sorption considering removed dyes through corresponding physical or chemical modification of adsorbents. The aim of the presented work was determination of dye (Acid Red 18) removal efficiency from water solutions by the method of adsorption with the use of active coals. Initial WG-12 carbon and carbons specially modified with use of CO₂, H₂O and air were used in the research. Modifications with use of the three first factors were conducted in circulating stove at temperatures of 400 and 800°C, but active carbons were also treated with 20 and 30% hydrogen peroxide solution. The conducted research on the sorption of Acid Red 18 has shown that better effects (greater sorption capacities) were obtained in case of activated carbons modified at temperature of 800°C, slightly worse ones were got at temperature 400°C, and the smallest for initial carbons. Similar results were obtained for carbon modified with H₂O₂ solutions. It is possible to put carbons modified in this way in following order: WG-12 (H₂O₂ 20%) > WG-12 (H₂O₂ 30%) > WG-12 initial.
Barwniki są związkami szeroko stosowanymi w różnych gałęziach przemysłu, takich jak: przemysł farbiarski, tekstylny, kosmetyczny, papierniczy, skórzany, spożywczy itp. Obecność barwników w wodzie, nawet w bardzo niskich stężeniach, może negatywnie wpływać na życie organizmów w tym środowisku. Istnieje wiele metod usuwania barwników - utlenianie chemiczne, koagulacja, procesy membranowe, wymiana jonowa, a także proces adsorpcji. Aby zwiększyć pojemność sorpcyjną węgli aktywnych ze względu na usuwane barwniki, można tego dokonać poprzez odpowiednią modyfikację tych adsorbentów. Celem prezentowanej pracy było określenie efektywności usuwania barwnika (pąs kwasowy 4R) z roztworów wodnych metodą adsorpcji z użyciem węgli aktywnych. W badaniach wykorzystano węgiel wyjściowy WG-12 oraz węgle specjalnie modyfikowane przy użyciu CO₂, H₂O oraz powietrza. Modyfikacje przy użyciu trzech pierwszych czynników prowadzono w piecu obrotowym w temperaturze 400 i 800°C, natomiast węgle aktywne traktowano także 20 i 30% roztworem nadtlenku wodoru. Przeprowadzone badania sorpcji pąsu kwasowego 4R wykazały, że lepsze efekty (większe pojemności sorpcyjne) uzyskano w przypadku węgli aktywnych modyfikowanych w temperaturze 800oC, nieco mniejsze w temperaturze 400°C, najmniejsze dla węgli wyjściowych. Podobne wyniki otrzymano dla węgli modyfikowanych roztworami H₂O₂. Węgle modyfikowane w ten sposób można uszeregować następująco: WG-12(20% H₂O₂) > WG-12(30% H₂O₂) > WG-12 wyjściowy.

Źródło:

Inżynieria i Ochrona Środowiska; 2016, 19, 3; 331-340
1505-3695
2391-7253

Pojawia się w:

Inżynieria i Ochrona Środowiska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

The use of activated carbons for removing organic matter from groundwater
Zastosowanie pylistych węgli aktywnych do usuwania materii organicznej z wody podziemnej

Autorzy:

Kaleta, J.
Kida, M.
Koszelnik, P.
Papciak, D.
Puszkarewicz, A.
Tchórzewska-Cieślak, B.

Powiązania:

https://bibliotekanauki.pl/articles/205458.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

groundwater
powdery activated carbon
granular activated carbon
organic matter
biosorption
woda gruntowa
pylisty węgiel aktywny
granulowany węgiel aktywny
materia organiczna
biosorpcja

Opis:

The article presents research results of the introduction of powdery activated carbon to the existing technological system of the groundwater treatment stations in a laboratory, pilot plant and technical scale. The aim of the research was to reduce the content of organic compounds found in the treated water, which create toxic organic chlorine compounds (THM) after disinfection with chlorine. Nine types of powdery active carbons were tested in laboratory scale. The top two were selected for further study. Pilot plant scale research was carried out for the filter model using CWZ-30 and Norit Sa Super carbon. Reduction of the organic matter in relation to the existing content in the treated water reached about 30%. Research in technical scale using CWZ-30 carbon showed a lesser efficiency with respect to laboratory and pilot-plant scale studies. The organic matter decreased by 15%. Since filtration is the last process before the individual disinfection, an alternative solution is proposed, i.e. the second stage of filtration with a granular activated carbon bed, operating in combined sorption and biodegradation processes. The results of tests carried out in pilot scale were fully satisfactory with the effectiveness of 70–100%.
W artykule przedstawiono wyniki badań w skali laboratoryjnej, półtechnicznej i technicznej nad wprowadzeniem do istniejącego układu technologicznego stacji uzdatniania wody podziemnej, pylistego węgla aktywnego. Celem badań było obniżenie zawartości występujących w wodzie uzdatnionej związków organicznych, które po procesie dezynfekcji chlorem tworzą toksyczne związki chloroorganiczne (THM). W skali laboratoryjnej przebadano 9 rodzajów pylistych węgli aktywnych, z których dwa najlepsze wytypowano do dalszych badań. Badania w skali półtechnicznej realizowano na filtrze modelowym z zastosowaniem węgli: CWZ-30 i Norit Sa Super. Obniżenie materii organicznej w stosunku do jej dotychczasowej zawartości w wodzie uzdatnionej wynosiło ok.30%. Badania w skali technicznej z zastosowaniem węgla CWZ-30 wykazały nieco mniejszą skuteczność w odniesieniu do badań laboratoryjnych i badań w skali półtechnicznej. Obniżenie zawartości materii organicznej wyniosło ok. 15%. Ponieważ ostatnim procesem jednostkowym przed dezynfekcją jest filtracja, zaproponowano alternatywne rozwiązanie – drugi stopień filtracji ze złożem granulowanego węgla aktywnego, pracującego w połączonych procesach sorpcji i biodegradacji. Rezultaty badań zrealizowanych w skali półtechnicznej były w pełni zadowalające – skuteczność 70–100%.

Źródło:

Archives of Environmental Protection; 2017, 43, 3; 32-41
2083-4772
2083-4810

Pojawia się w:

Archives of Environmental Protection

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Desorption of volatile organic compound from activated carbon with microwave heating
Desorpcja lotnych związków organicznych z węgla aktywnego z wykorzystaniem ogrzewania mikrofalowego

Autorzy:

Araszkiewicz, M.

Powiązania:

https://bibliotekanauki.pl/articles/2070749.pdf

Data publikacji:

2009

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

desorpcja
mikrofale
węgiel aktywny
VOC
desorption
microwaves
activated carbon

Opis:

Possibility of the use of microwave energy in desorption of volatile organic compounds from activated carbon is described. General idea and preliminary experimental results obtained in a laboratory-scale experimental setup are presented.
Praca opisuje możliwość wykorzystania energii mikrofalowej do desorpcji lotnych związków organicznych z węgla aktywnego. W pracy przedstawiono ogólną ideę procesu i wstępne wyniki eksperymentalne, przeprowadzone w aparaturze badawczej w skali laboratoryjnej.

Źródło:

Inżynieria i Aparatura Chemiczna; 2009, 5; 15--16
0368-0827

Pojawia się w:

Inżynieria i Aparatura Chemiczna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Effect of silver, nickel and copper cyanides on gold adsorption on activated carbon in cyanide leach solutions

Autorzy:

Sayiner, B.
Acarkan, N.

Powiązania:

https://bibliotekanauki.pl/articles/109675.pdf

Data publikacji:

2014

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

gold
silver
nickel
copper
cyanide leaching
activated carbon adsorption

Opis:

The effect of Ag, Ni and Cu cyanides on gold adsorption on activated coconut carbon in cyanide leach solutions was investigated by synthetic cyanide leach solutions containing gold and other metal cyanides. According to the adsorption tests Ag remarkably reduces the gold adsorption on activated carbon by competing with gold to adsorption sites. When the Ag concentration in solution increases up to 200 ppm the carbon adsorption method for gold recovery becomes inapplicable. Ni has an effect on gold adsorption on activated carbon, however even at as high concentrations of Ni as 250 ppm residual Au in solution is still below 1 ppm. Cu addition up to 300 ppm does not affect the gold loading significantly. According to the adsorption test studies, it is concluded that the metal-cyanides diminish the gold adsorption on activated carbon by adsorbing themselves and competing with gold. When the metals are present in the leach solution all together with gold, they also prevent adsorption of themselves as well as gold. Thus, when Au, Ag, Ni and Cu are present in solution simultaneously, the adsorption of all these metals decreases. The adsorption results were modeled by Fleming k,n adsorption kinetic model.

Źródło:

Physicochemical Problems of Mineral Processing; 2014, 50, 1; 277-287
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Treatment of Contaminated Water from Niger Delta Oil Fields with Carbonized Sisal Fibre Doped with Nanosilica from Ofada Rice Husk

Autorzy:

Odunlami, Olayemi Abosede
Agboola, Oluranti
Odiakaose, Ebubechukwu Olive
Olabode, Oladipupo Oyindapo
Babalola, Oni
Abatan, Olubunmi Grace
Owoicho, Isaac

Powiązania:

https://bibliotekanauki.pl/articles/2173355.pdf

Data publikacji:

2022

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

adsorption
oil spill
sisal fibre
activated carbon
silica nanoparticles

Opis:

Oil spills contaminate water bodies and hence, cause the death of marine animals. The Niger Delta Oil contaminated water was treated by adsorption using sisal fibre activated carbon (SFAC) doped with silica nanoparticles (SNP) synthesized from Ofada rice husk which was carbonized at temperatures 400 °C and 650 °C. The SNP was synthesized at 600 °C (SNP-1) and 800 °C (SNP-2). The proportion in SFAC: SNP for both temperature values was 4.8:0.2 with a basis of 5 grams of the adsorbent. The samples were characterized by SEM, BET analysis, XRF and XRD. The adsorption equilibrium studies obeyed Langmuir adsorption isotherm; as the linear correlation value was close to unity, with a separation factor of 0.004. SNP-1 shows amophous nature having Fe2O3 and SNP-2 shows crystalline nature which consist of quartz. SNP-2 was used for the study due to its high surface area observed in the BET. High % removal efficiency of 99.84 was attained with silica nanoparticle (SNP-2) integrated in sisal fiber activated carbon (SFAC carbonized at 400 °C).

Źródło:

Journal of Ecological Engineering; 2022, 23, 9; 297--308
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Activated carbons from common nettle as potential adsorbents for CO2 capture

Autorzy:

Szymańska, Alicja
Skoczek, Amelia
Przepiórski, Jacek

Powiązania:

https://bibliotekanauki.pl/articles/778957.pdf

Data publikacji:

2019

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

activated carbon
common nettle
CO2 adsorption
chemical activation

Opis:

Activated carbons (ACs) prepared from common nettle (Urtica Dioica L.) were studied in terms of carbon dioxide adsorption. ACs were prepared by KOH chemical activation in a nitrogen atmosphere at temperatures (ranging from 500 to 850°C). The pore structure and the surface characterization of the ACs were specified based on adsorption-desorption isotherms of nitrogen measured at –196°C and carbon dioxide at 0°C. The specific surface area was calculated according to the BET equation. The pore volume was estimated using the DFT method. The highest values of the specific surface area (SSA) showed activated carbons produced at higher carbonization temperatures. All samples revealed presence of micropores and mesopores with a diameter range of 0.3–10 nm. The highest value of the CO₂ adsorption, 4.22 mmol/g, was found for the material activated at 700°C.

Źródło:

Polish Journal of Chemical Technology; 2019, 21, 1; 59-66
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 35.

Tytuł:

Application of Cassava Peels Activated Carbon in the Treatment of Oil Refinery Wastewater – A Comparative Analysis

Autorzy:

Oghenejoboh, K. M.
Otuagoma, S. O.
Ohimor, E. O.

Powiązania:

https://bibliotekanauki.pl/articles/125348.pdf

Data publikacji:

2016

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

cassava peels
activated carbon
adsorption
refinery wastewater
environment
pollutant

Opis:

A comparative analysis of the efficiency of activated carbon produced from fermented cassava peels (CPB), unfermented cassava peels (CPA) and commercial grade activated carbon (CAC) in the treatment of refinery wastewater was carried out. CPB was found to be 8% and 18% more efficient when compared to CPA and CAC in the removal of COD, and 14% and 3% better than CAC and CPA respectively in the removal of BOD5. The removal efficiency of Pb²⁺ by CPB was 100% compared to 95% and 57% by CPA and CAC while 96% of phenol was removed by CPB against 93% and 83% by CPA and CAC respectively. This better performance of CPB over CPA and CAC is not unconnected with its higher pH resulting from the removal of cyanide from the peels during the fermentation process. However, despite the high phenol removal efficiency by CPB, the concentration of phenol in the treated effluent does not meet the environmental guidelines for disposal. It is therefore, recommended that a two-stage CPB adsorption column arranged in series is necessary to treat refinery wastewater efficiently if it is desired to totally remove phenol from the effluent or reduce the concentration to 0.005 mg/l allowed by the Federal environmental protection agency (FEPA). The equilibrium adsorption test conducted showed that the Freundlich isotherm is a better fit for the adsorption of phenol by the three activated carbons with correlation coefficients (R2) of 0.9364, 0.9383 and 0.9541 for CAC, CPA and CPB respectively. CPB was found to be a better adsorbent as it has the highest adsorptive capacity as evidenced from its better Freundlich exponent.

Źródło:

Journal of Ecological Engineering; 2016, 17, 2; 52-58
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 36.

Tytuł:

Localized states in nanocarbons

Autorzy:

Kempiński, W.
Kempiński, M.
Markowski, D.
Łoś, M.

Powiązania:

https://bibliotekanauki.pl/articles/148234.pdf

Data publikacji:

2013

Wydawca:

Instytut Chemii i Techniki Jądrowej

Tematy:

activated carbon fibers (ACF)
carbon nanotubes
electron paramagnetic resonance (EPR)
fullerenes

Opis:

Localization phenomenon is studied in different modern nanocarbon materials: pristine C60, C60-fullerides, carbon nanotubes and graphene-based structures in the form of activated carbon fibers built of quantum dot-like basic structural units. Two experimental methods are used to define the localization and population control of spins (charge carriers) in the nanocarbon materials – electron paramagnetic resonance (EPR) and direct current (d.c.) electrical conductivity measurements. Results are discussed in the frame of the possible applications of the aforementioned materials in the molecular electronics or spintronics.

Źródło:

Nukleonika; 2013, 58, 3; 371-373
0029-5922
1508-5791

Pojawia się w:

Nukleonika

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Utilization of Desulfurized Heavy Liquid Fuel Blends in Domestic Boiler

Autorzy:

Al Aboushi, Ahmad
Abdelhafez, Eman
Hamdan, Mohammad
Ajib, Salman
Alsaqoor, Sameh

Powiązania:

https://bibliotekanauki.pl/articles/27323821.pdf

Data publikacji:

2023

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

shale oil
domestic boiler
activated carbon
diesel
sulfur oxide

Opis:

One way to cut down the consumption of diesel fuel in domestic heating in Jordan is to blend it with shale oil, which may be extracted from oil shale. This leads to a cut down in the national fuel bill in Jordan. Unfortunately, shale oil contains significant amounts of sulfur as impurities and upon burning sulfur oxides are emitted causing a negative environmental impact, and hence desulfurization of such fuel blends is essential. This may be achieved by adding activated carbon to the fluids. The process of removing sulfur from shale oil is crucial for safeguarding the environment, human well-being, and equipment, as well as meeting regulatory requirements and creating superior-quality goods. In this study, a domestic boiler was utilized to evaluate the degree of desulfurization process of blends of diesel and shale oil fuels upon their burning in a domestic boiler, to achieve this, blends of both fuels were prepared with varying amounts of shale oil (10%, 20%, 30%, and 40%) and various amounts of activated carbon were added to the prepared mixtures of diesel fuel and shale oil. The assessment of performance included examining the environmental impact, specifically by analyzing exhaust gases to measure the concentration of Sulfur Oxide (SO2). It was found that an increase in the concentration of shale oil in the mixture led to an increase in the concentration of SO2. However, adding more activated carbon to the mixture from the fuels resulted in a decrease in the SO2 concentration. The lowest SO2 concentration was observed when 1g of activated carbon was added per liter of the fuel mixture at a 20% concentration of shale oil, and 0.6g of activated carbon per liter of the fuel mixture at a 40% concentration of oil shale.

Źródło:

Journal of Ecological Engineering; 2023, 24, 7; 225--233
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 38.

Tytuł:

Batch Removal of Metanil Yellow (MY) from Aqueous Solution by Adsorption on HNO3-Treated-H3PO4-Activated Carbon (NATPAAC) from Gmelina arborea Roxb.: Kinetic and Mechanism Studies

Autorzy:

Isiuku, B. O.
Onyema, M. O.

Powiązania:

https://bibliotekanauki.pl/articles/1113804.pdf

Data publikacji:

2017

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Activated carbon
Gmelina arborea
adsorption
kinetic models
metanil yellow

Opis:

As metanil Yellow dye is removed from aqueous solution by batch adsorption on NATPAAC derived from G. aborea bark, we studied the effects of initial dye concentration (Co), initial pH and adsorbent dosage at 29 °C. The experimental equilibrium adsorption capacities (qe) obtained, were 2.35, 1.00 and 0.48 mg/g for Co 25, 50 and 100 mg/L, respectively. The kinetics and mechanism of the adsorption were then modeled by fitting experimental data into the pseudo-second order (PSO), Based on correlation coefficient R2 (> 0.95) values, results show that the PSO and Elovich models simulated experimental data well, but the PSO model simulated it the best. The Boyd model confirmed that the adsorption process was controlled by liquid film diffusion and the effective diffusion coefficients were very low. Moreover, the qe values decreased with increase in Co, increase in pH and increase in adsorbent dosage. However, the removal of MY from aqueous solution was very low. In addition, treatment of carbon with dilute HNO3 had no favorable impact.

Źródło:

World News of Natural Sciences; 2017, 13; 10-26
2543-5426

Pojawia się w:

World News of Natural Sciences

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 39.

Tytuł:

Application of surfactant-modified montmorillonite in nitrophenol removal by adsorption

Autorzy:

Baysal, Gülay

Powiązania:

https://bibliotekanauki.pl/articles/207393.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

nitrophenol removal
activated carbon
NMR
usuwanie nitrofenoli
węgiel aktywny

Opis:

Quaternary ammonium salts (QASs) such as 1-methyl-di-nonyl-1 phenyl ammonium iodide (QAS₁) and 1-methyl-di-dodecyl-1 phenyl ammonium iodide (QAS₂) were newly synthesized by complete alkylation reaction for modification of sodium montmorillonite (Mt). The sodium montmorillonite was modified via an ion-exchange reaction with QAS₁ and QAS₂, and two organoclays, Mt₁ and Mt₂, have been obtained. The synthesized quaternary ammonium salts were analyzed by nuclear magnetic resonance spectroscopy (NMR). The organoclays (Mt₁ and Mt₂) were characterized by a range of methods including X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM). The adsorption capacities of the synthesized organo-montmorillonites for the hydrophobic organic pollutant 4-nitrophenol (4-NP) have been evaluated. The distances between the organoclay layers showed a much better opening than that reported in the literature. The results show that the adsorption capacity increased in the order Mt₂ > Mt₁. The adsorption capacities of Mt₁ and Mt₂ for 4-NP were 77% and 81%, respectively.

Źródło:

Environment Protection Engineering; 2019, 45, 2; 19-33
0324-8828

Pojawia się w:

Environment Protection Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 40.

Tytuł:

Węgle aktywne ze stałej pozostałości po szybkiej pirolizie biomasy
Activated Carbons from Solid Residue from Fast Pyrolysis of Biomass

Autorzy:

Lorenc-Grabowska, E.
Rutkowski, P.

Powiązania:

https://bibliotekanauki.pl/articles/297575.pdf

Data publikacji:

2013

Wydawca:

Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej

Tematy:

węgle aktywne
piroliza
biomass-based activated carbon
adsorption
dyes

Opis:

Zbadano węgle aktywne otrzymane ze stałej pozostałości po szybkiej pirolizie biomasy celulozy (C) i trocin (T) oraz ich mieszanek z polimerami syntetycznymi: celulozy/polistyrenu (3:1) (CPS), celulozy/polipropylenu (3:1)(CPP) oraz trocin/polistyrenu (3:1) (TPS) i trocin/polipropylenu (3:1) (TPP). Węgle aktywne otrzymano na drodze aktywacji parą wodną w temperaturze 850°C do 50% ubytku masy. Węgle scharakteryzowano, opierając się na analizie technicznej, elementarnej oraz sorpcji azotu w −196°C. Dodatkowo dla wybranych węgli aktywnych przeprowadzono adsorpcję fenolu, czerwieni Kongo i witaminy B12. Adsorpcję wykonano w warunkach statycznych w temperaturze pokojowej. Wyznaczono czasy osiągania stanu równowagi oraz pojemność sorpcyjną. Wszystkie otrzymane węgle aktywne wykazały zasadowy charakter chemiczny powierzchni. Węgle otrzymane z celulozy są to typowo mikroporowate węgle aktywne, podczas gdy węgle aktywne z trocin charakteryzowały się dobrze rozwiniętą strukturą mikro- i mezoporowatą.
The activated carbons (ACs) were produced from solid residue of cellulose and synthetic polymer co-pyrolysis and sawdust and polymer co-pyrolysis. The solid residues of a mixture of cellulose/polystyrene (3:1) (CPS), sawdust/polystyrene (3:1) (TPS), cellulose/polypropylene (3:1) (CPP), sawdust/polypropylene (3:1) (TPP), and only cellulose (C) only sawdust (T) have been produced in two steps pyrolysis. In the first step the sample is slowly heated up to 400°C with heating rate 3°C/minutes and next the second step is the fast pyrolysis with heating rate 100°C/second up to 900°C. The ACs have been obtained by steam activation at 850°C up to about 50% burn off. The elemental analysis of C, H, N and S was performed using a Vario III Elemental Analyzer. The oxygen content was calculated by difference. The porous texture was determined from nitrogen adsorption isotherms measured at −196°C with a NOVA 2200 (Quantachrome). For a chosen activated carbon the adsorptive properties toward phenol, Congo red, and vitamin B12 have been determined. The adsorption processes were carried out in static condition at ambient temperature. The equilibrium time and equilibrium sorption capacity were determined. All obtained ACs have basic surface characteristics. The cellulose based activated carbons are predominantly microporous whereas the sawdust based AC have well developed both micro and mesoporous structure. Activated carbon from cellulose has high adsorption capacity toward phenol whereas AC from sawdust is found to be very efficient adsorbent for the removal of Congo red and vitamin B12. Additionally, the adsorption of phenol and Congo red was enhanced by electrostatic forces that appeared between the adsorbed molecules and activated carbon surface.

Źródło:

Inżynieria i Ochrona Środowiska; 2013, 16, 2; 205-215
1505-3695
2391-7253

Pojawia się w:

Inżynieria i Ochrona Środowiska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Kinetic Modelling and Half Life Study of Adsorptive Bioremediation of Soil Artificially Contaminated With Bonny Light Crude Oil

Autorzy:

Agarry, S. E.
Oghenejoboh, K. M.
Solomon, B. O.

Powiązania:

https://bibliotekanauki.pl/articles/123870.pdf

Data publikacji:

2015

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

activated carbon
biochar
biodegradation
crude oil
first-order kinetics

Opis:

In this study, comparative potential effects of commercial activated carbon (CAC) and plantain peel-derived biochar (PPBC) of different particle sizes and dosage to stimulate petroleum hydrocarbon biodegradation in soil were investigated. Microcosms containing soil were spiked with weathered Bonny light crude oil (WBLCO) (10% w/w) and amended with different particle sizes (0.02, 0.07 and 0.48 mm) and dosage (20, 30 and 40 g) of CAC and PPBC, respectively. The bioremediation experiments were carried out for a period of 28 days under laboratory conditions. The results showed that there was a positive relationship between the rate of petroleum hydrocarbons reduction and presence of the CAC and PPBC in crude oil contaminated soil microcosms. The WBLCO biodegradation data fitted well to the first-order kinetic model. The model revealed that WBLCO contaminated-soil microcosms amended with CAC and PPBC had higher biodegradation rate constants (k) as well as lower half-life times (t_1/2) than unamended soil (natural attenuation) remediation system. The rate constants increased while half-life times decreased with decreased particle size and increased dosage of amendment agents. ANOVA statistical analysis revealed that WBLCO biodegradation in soil was significantly (p = 0.05) influenced by the addition of CAC and biochar amendment agents, respectively. However, Tukey’s post hoc test (at p = 0.05) showed that there was no significant difference in the bioremediation efficiency of CAC and PPBC. Thus, amendment of soils with biochar has the potential to be an inexpensive, efficient, environmentally friendly and relatively novel strategy to mitigate organic compound-contaminated soil.

Źródło:

Journal of Ecological Engineering; 2015, 16, 3; 1-13
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 42.

Tytuł:

Filter beds supplemented with powdered activated carbon

Autorzy:

Bielski, A.
Zymon, W.

Powiązania:

https://bibliotekanauki.pl/articles/208040.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

PAC
powdery activated carbon
sedimentation
coagulation
złoże filtracyjne
sedymentacja
koagulacja

Opis:

Various factors influencing adsorption on powdered activated carbon (PAC) used for the removal of organic compounds from water and wastewater have been investigated. Incomplete utilization of adsorption capacity of PAC observed in current technological applications is caused by too short con-tact times of aqueous solutions with carbon particles and the system configuration (adsorption in volume systems with simultaneous coagulation). A new method has been proposed involving application of PAC into the upper layer of a two-layer filter or a middle layer of a three-layer filter during bed fluidization. The extended contact time between aqueous solutions and PAC increases the amount of adsorbate adsorbed on the surface of activated carbon. A comparative studies conducted on adsorption in both volume and column systems confirmed better utilization of adsorption capacity for PAC applied on a filter bed. Two models of PAC adsorption in transient conditions were developed for volume and column systems. Computer simulations confirmed that the adsorption capacity of PAC may be in-creased by several times in column systems with respect to the commonly used adsorption with coagulation in volume systems.

Źródło:

Environment Protection Engineering; 2017, 43, 2; 173-191
0324-8828

Pojawia się w:

Environment Protection Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Effect of the Process of WG-12 Activated Carbon Modification on the Sorption of Chromium
Wpływ prowadzenia procesu modyfikacji węgla aktywnego WG-12 na sorpcję chromu

Autorzy:

Lach, J.
Ociepa, E.

Powiązania:

https://bibliotekanauki.pl/articles/387752.pdf

Data publikacji:

2013

Wydawca:

Towarzystwo Chemii i Inżynierii Ekologicznej

Tematy:

sorption
activated carbon
modification
chromium
sorpcja
węgiel aktywny
modyfikacja
chrom

Opis:

The article presents the results of activated carbon modification with the usage of Joule heat. The modification was carried out in the reactor (h = 25 cm and d = 5,5 cm) filled with activated carbon. The reactor was equipped with two electrodes located on both sides and connected with a direct current generator. The flow of the current through the activated carbon bed was accompanied by gradual increase in activated carbon temperature. The modification took place during the flow of carbon dioxide while heating up and/or cooling down the bed. The effects of modification were evaluated on the basis of Cr(III) and Cr(VI) adsorption isotherms each time on three parts of activated carbon sampled from different heights of the bed. The presented method of modification of the WG-12 carbon for removal of Cr(III) and Cr(VI) cations from aqueous solutions improved sorption capacities of the investigated sorbents towards both ions (WG/400EII/40AIRs, WG/400EI/80AIRs). In the majority of cases, modification increased the efficiency of removing one ion while reducing the other.
W artykule przedstawiono wyniki modyfikacji węgla aktywnego z udziałem ciepła Joule’a. Modyfikację prowadzono w reaktorze o wysokości h = 25 cm i średnicy d = 5,5 cm wypełnionym węglem aktywnym. Z dwóch stron reaktora przyłożono elektrody podłączone do źródła prądu stałego. Przepływowi prądu przez złoże towarzyszyło podwyższenie temperatury węgla aktywnego. Modyfikacja następowała podczas przepływu dwutlenku węgla podczas nagrzewania i/lub studzenia tego złoża. Efekty modyfikacji oceniono na podstawie izoterm sorpcji Cr(III) i Cr(VI) każdorazowo na trzech partiach węgla aktywnego pobieranego z różnych wysokości złoża. Przedstawione w pracy sposoby modyfikacji węgla WG-12 pod kątem usuwania z roztworów wodnych kationu Cr(III) i Cr(VI) pozwalają na uzyskanie sorbentów o zwiększonych pojemnościach w stosunku do obydwu badanych jonów (WG/400EII/40AIRś, WG/400EI/80AIRś). W większości przypadków modyfikacja zwiększyła skuteczność usuwania jednego jonu, ale obniżyła drugiego.

Źródło:

Ecological Chemistry and Engineering. A; 2013, 20, 6; 731-739
1898-6188
2084-4530

Pojawia się w:

Ecological Chemistry and Engineering. A

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 44.

Tytuł:

Ocena przydatności iłołupków bentonitowych do usuwania fenolu z roztworów wodnych
Assessment of Usability of Bentonite Clays for Removing Phenol from Water Solutions

Autorzy:

Kaleta, J.
Papciak, D.
Puszkarewicz, A.

Powiązania:

https://bibliotekanauki.pl/articles/1819215.pdf

Data publikacji:

2013

Wydawca:

Politechnika Koszalińska. Wydawnictwo Uczelniane

Tematy:

przydatność iłołupków
usuwanie fenolu
activated carbon
aqueous solutions
adsorption
waste

Opis:

The paper presents the results of laboratory testing of the potential use of bentonite clay from Dynowskie Foothills for removing phenol from model water solutions. Both natural clays and those treated with sodium carbonate, hydrochloric and sulfuric acids were used. The paper shows the characteristics of phenols occurring in natural water. The sources of phenols, i.e. household and industrial wastewater as well as municipal landfills and damps are given. The aim of the experiments was to determine a quantitative formulation of the adsorption process, as well as to describe the effect of various factors on the process itself. An attempt was made to solve the tasks using model experimental setups. Model phenol solution, concentration of 20,00 mg/L, prepared using distilled water was applied as an adsorptive. The phenol concentration in model solutions was determined using the linear relationship between the concentration of this compound and the absorbency value at the wavelength of 254 nm. The absorbency value was read with a SHIMADZU UV – 1601 spectophotometer using quartz cuvets with an absorbing layer 10 mm thick. The results obtained in a successive series of experiments performed under static conditions were described using basic izoterm equations i.e. those of Freundlich, Langmuir and BET. Freundlich’s equations best described the process. The adsorption capacity of the active clays tested was calculated on the basis of the isotherms. Natural clay had an adsorptive capacity of 0,74 mg/g, clay modified with hydrochloric acid 2,41 mg/g, clay modified with sulfuric acid 1,83 mg/g and clay modified with sodium carbonate 0,50 mg/g. Dynamic conditions were realised by the column filtration method. The adsorption columns were made of organic glass 32 mm in diameter, the filling height was 750 mm, filtration rate – 12 m/h. Filtration was performed from the top downwards. Filtration lasted each time until the moment of bed exhaustion, i.e. such a point where the concentration in the discharge becomes equal to that of the initial solution. The sorption effectiveness under flow conditions for bentonite clays was 100%. On the basis of the results obtained, the breakthrough curves, the so-called iso-planes, were prepared and served in turn to determine the adsorption capacities under flow conditions. The adsorptive capacities were higher than those determined through static conditions and these were 15,9 mg/g, 19,9 mg/g, 18,8 mg/g and 15,2 mg/g for natural clay, clay modified with hydrochloric acid, clay modified with sulfuric acid and clay modified with sodium carbonate, respectively. The clay modified with sodium hydrochloric acid exhibited the highest values of adsorption capacities, as determined under both static and flow conditions. Modification of samples with hydrochloric and sulfuric acids appeared advantageous for both technological and economic reasons. The exit curves (iso-planes) were used to determine the mass penetration zone (the adsorption front height), as well as to calculate the rate at which the mass-exchange zone advanced. The adsorption front height for the carbons tested was 3–5 times lower than the adsorption bed height, thus confirming the high effectiveness of clays in phenol removal. Despite this considerable superiority of active carbon as sorbent, bentonite clays may be taken into account in designing process systems, especially as insulating materials in relation to active carbon. The array of water conditioning processes to be employed for phenol polluted water should in each case be preceded by detailed and thorough technological studies.

Źródło:

Rocznik Ochrona Środowiska; 2013, Tom 15, cz. 3; 2352-2368
1506-218X

Pojawia się w:

Rocznik Ochrona Środowiska

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 45.

Tytuł:

Adsorpcyjne usuwanie 4-nitrofenolu z wody
Removal of 4-nitrophenol from water by adsorption

Autorzy:

Gwadera, M.
Marcinek, A.

Powiązania:

https://bibliotekanauki.pl/articles/2073028.pdf

Data publikacji:

2015

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

adsorpcja
węgiel aktywny
4-nitrofenol
adsorption
activated carbon
4-nitrophenol

Opis:

Przeprowadzono badania doświadczalne równowagi i kinetyki adsorpcji 4-nitrofenolu z roztworu wodnego na węglu aktywnym. Przedstawiono model matematyczny procesu oparty na przybliżonym równaniu kinetyki adsorpcji. Wyniki badań doświadczalnych i numerycznych wykorzystano do wyznaczenia współczynnika dyfuzji składnika w ziarnach węgla aktywnego. Otrzymano wartość Ds=0,167-10-12m2/s.
Experimental study of equilibrium and kinetics of 4-nitrophenol adsorption from aqueous solution on activated carbon was investigated. A mathematical model of the process based on the approximate kinetic equation of adsorption is presented. The results of experimental and numerical studies were used to determine the diffusion coefficient in active carbon grains. A value of Ds equal to 0,167-10-12m2/s was obtained.

Źródło:

Inżynieria i Aparatura Chemiczna; 2015, 2; 36--37
0368-0827

Pojawia się w:

Inżynieria i Aparatura Chemiczna

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 46.

Tytuł:

Wpływ prowadzenia procesu modyfikacji węgla aktywnego WG-12 z udziałem ciepła Joulea i powietrza na sorpcję Cr(III)
Effect of the WG-12 active carbon modification process based on the Joule heat and the air on the sorption of Cr(III)

Autorzy:

Lach, J.
Ociepa, E.

Powiązania:

https://bibliotekanauki.pl/articles/127493.pdf

Data publikacji:

2009

Wydawca:

Towarzystwo Chemii i Inżynierii Ekologicznej

Tematy:

sorpcja
węgiel aktywny
modyfikacja
chrom
sorption
activated carbon
modification
chromium

Opis:

Węgle aktywne stosowane w technologii wody są najczęściej używane do usuwania związków organicznych. Można je jednak również wykorzystać do sorpcji zanieczyszczeń mineralnych m.in. metali ciężkich. Pojemności sorpcyjne węgli aktywnych w stosunku do tych zanieczyszczeń są niewielkie, ale również ich stężenia w wodach są małe. Dodatkowo można zwiększyć skuteczność usuwania metali ciężkich, poddając węgle aktywne modyfikacji. W artykule przedstawiono wyniki modyfikacji węgla aktywnego z udziałem ciepła Joule’a. Modyfikację prowadzono w reaktorze o wysokości h = 25 cm i średnicy d = 5,5 cm wypełnionym węglem aktywnym. Z dwóch stron reaktora przyłożono elektrody podłączone do źródła prądu stałego. Przepływowi prądu przez złoże towarzyszyło podwyższenie temperatury węgla aktywnego. Efekty modyfikacji oceniono na podstawie izoterm sorpcji Cr(III) każdorazowo dla trzech partii węgla aktywnego pobieranego z różnych wysokości złoża. W przypadku modyfikacji złoża w wyniku nagrzewania do 400°C i studzenia za pomocą przepływającego powietrza z intensywnością 40 dm3/h otrzymano znacznie większe pojemności sorpcyjne w stosunku do Cr(III), jeżeli pobierany jest węgiel z dolnej i środkowej części złoża. Węgiel z górnej części obniżył swe możliwości sorpcji kationu Cr(III). Prowadzenie procesu modyfikacji węgla aktywnego w dwóch cyklach nagrzewania i studzenia nie jest celowe. Uzyskane wartości sorpcji Cr(III) są większe niż w przypadku węgla niemodyfikowanego, ale mniejsze niż na węglach modyfikowanych w jednym cyklu. Przeanalizowano również zwiększenie prędkości przepływu powietrza podczas studzenia złoża z 40 do 80 dm3/h. Uzyskane wyniki sorpcji Cr(III) świadczą, że zmiana ilości powietrza w badanym zakresie nie wypłynęła w znacznym stopniu na parametry uzyskanego sorbentu.
The activated carbons used in the water technology are the most frequently used to the removing of organic compounds. They can also be used to the adsorption of mineral pollutions among others heavy metals. The adsorption capacities of activated carbons in relation to these pollutions are slight and their concentrations in waters are also low. There also can be increased the efficiency of removing heavy metals by modifying activated carbons. In the article there have been presented the results of activated carbon modification with the usage of Joule heat. The modification was carried out in the reactor of the height: h = 25 cm and diameter: d = 5.5 cm filled with activated carbon. At two sides of the reactor there were put electrodes which were joined with direct current generator. The flow of the current through the deposit was accompanied by a rise in temperature of activated carbon. The effects of modification were evaluated on the basis of Cr(III) adsorption isotherms at each time on three parts of activated carbon taken from different heights of the deposit. In the case of deposit modification as the result of heating up to 400ºC and cooling down by means of flowing air with the intensity of 40 dm3/h there were obtained much higher adsorption capacities in relation to Cr(III) if carbon is taken from the bottom and the middle part of the deposit. The carbon from the high part of the deposit decreased its abilities of cation Cr(III) adsorption. The carrying out of the modification process of activated carbon in two cycles of heating up and cooling down is not advisable. The obtained Cr(III) adsorption results are higher than in the case of non-modified carbon, however, they are lower than on carbons modified in one cycle. There has been also analyzed the increasing of speed of air flow during the cooling down of the deposit from 40 to 80 dm3/h. The obtained results of Cr(III) adsorption prove that the change of air in the examined range did not have a great influence on the obtained sorbent.

Źródło:

Proceedings of ECOpole; 2009, 3, 1; 165-170
1898-617X
2084-4557

Pojawia się w:

Proceedings of ECOpole

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 47.

Tytuł:

Wpływ zmian pH i temperatury na proces adsorpcji kwasu salicylowego na przemysłowych węglach aktywnych
The Effect of pH and Temperature on Adsorption of Salicylic Acid for Industrial Activated Carbons

Autorzy:

Szymonik, A.
Lach, J.

Powiązania:

https://bibliotekanauki.pl/articles/297724.pdf

Data publikacji:

2013

Wydawca:

Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej

Tematy:

adsorpcja
węgiel aktywny
kwas salicylowy
adsorption
activated carbon
salicylic acid

Opis:

Przeprowadzono badania nad sorpcją kwasu salicylowego z roztworów wodnych na przemysłowych węglach aktywnych WG-12 i ROW-08. Wykazano, że wielkość adsorpcji na poszczególnych węglach aktywnych zależy od pH i temperatury roztworu, z którego są sorbowane. Najistotniejsze znaczenie ma wartość pH roztworu, która decyduje o stopniu jonizacji cząsteczek kwasu. Najwięcej cząstek jest adsorbowanych przy niskich wartościach pH (pH = 2), w których kwas występuje w formie niezjonizowanej. Badania adsorpcji prowadzone w temperaturach 20 i 40°C świadczą o egzotermiczności procesu.
The article presents the results of the study on sorption of salicylic acid from water solutions on the selected industrial activated carbons: WG-12, ROW 08 and F-300. The highest efficiency of sorption was observed for the F-300 activated carbon. The efficiency of sorption on selected activated carbons depends on pH and temperature of the solution subjected to sorption. The highest number of particles was adsorbed at low values of pH (pH = 2) and at low temperature (20°C). With the increase in pH and temperature of the solution the efficiency of adsorption decreases.

Źródło:

Inżynieria i Ochrona Środowiska; 2013, 16, 3; 331-339
1505-3695
2391-7253

Pojawia się w:

Inżynieria i Ochrona Środowiska

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 48.

Tytuł:

Differences in thickness variations of activated carbon in decreasing oil and grease levels using modified grease trap on the canteen wastewater

Autorzy:

Fikri, Elanda
Hanifati, Dhaifina
Hidayah, Nurul

Powiązania:

https://bibliotekanauki.pl/articles/35524707.pdf

Data publikacji:

2021

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie

Tematy:

canteen wastewater
modified grease trap
thickness
activated carbon
oil
grease

Opis:

Wastewater is residual water of industrial activities and domestic wastewater that is derived from daily activities of human life related to water usage, such wastewater should not be discharged into water bodies if it has not met the standards based on the regulation. Oil and grease contained in the water bodies will form a layer on the surface because the density of oil is lower than the density of water. The layer of oil and grease will block the entry of sunlight and cause the inability in the photosynthesis process of aquatic plants. The textile industry facilitates canteens within the company which operates daily at 11.00–13.00 Western Indonesian Time, resulting in the domestic wastewater from the canteen kitchen activities. The purpose of this study was to determine differences in the thickness variations of activated carbon to reduce oil and grease levels using modified grease traps on the canteen wastewater at PT. Sipatex Putri Lestari. The type of study used was categorized as a field experiment with a pretest–posttest research design. The population of the study was the entire canteen wastewater of PT. Sipatex Putri Lestari. The sampling technique used the time composite method. The univariate analysis of the study showed the average number of decreases in oil and grease levels in the treatment as 12.32, 15.98 and

Źródło:

Scientific Review Engineering and Environmental Sciences; 2021, 30, 1; 106-116
1732-9353

Pojawia się w:

Scientific Review Engineering and Environmental Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 49.

Tytuł:

Materiały węglowe jako nośniki leków - wykorzystanie nowatorskiej metody HMD (hot-melt deposition) w syntezie układów kontrolowanego uwalniania paracetamolu
Carbon Materials as Drug Carriers - the Use of Innovative Method of HMD (Hot-Melt Deposition) in the Synthesis of New Drug Delivery Systems of Paracetamol

Autorzy:

Bielicka, A.
Wiśniewski, M.
Terzyk, A. P.
Gauden, P. A.
Furmaniak, S.
Kowalczyk, P.

Powiązania:

https://bibliotekanauki.pl/articles/297275.pdf

Data publikacji:

2013

Wydawca:

Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej

Tematy:

nanorurki węglowe
węgiel aktywny
paracetamol
hot-melt deposition
carbon nanotubes
activated carbon

Opis:

Metoda „hot-melt deposition” (HMD) cieszy się coraz większym zainteresowaniem, o czym świadczą liczne prace dotyczące preparatyki nośników leków otrzymywanych na bazie polimerów. Osadzanie leków metodą HMD ma na celu rozproszenie medykamentu w homogeniczny sposób w stosowanej matrycy. Metoda ta umożliwia wykorzystanie trudno lub słabo rozpuszczalnych leków w preparowanych układach uwalniania leków. Przedstawione wyniki systematycznych badań adsorpcji paracetamolu na zamkniętych, komercyjnie dostępnych i niemodyfikowanych nanorurkach węglowych, a także wybranych węglach aktywnych z wykorzystaniem analizy termicznej, adsorpcji metodą statyczną i dynamiczną, symulacji metodą dynamiki molekularnej pozwoliły potwierdzić, iż paracetamol w przestrzeniach międzyrurowych i w porach węgli aktywnych występuje w postaci nanoagregatów. W niniejszej pracy przedstawiono także wyniki badań osadzania paracetamolu na wybranych materiałach węglowych metodą HMD poprzez wygrzewanie w wysokich temperaturach. Zastosowanie powyższej metodyki umożliwiło otrzymanie nowego rodzaju nośnika leku. Nowe układy charakteryzowały się różną szybkością procesu uwalniania medykamentu, która zależała od typu węglowej matrycy i parametrów procesu. Metoda „hot-melt” okazuje się perspektywiczną metodą otrzymywania nowych skutecznych i efektywnych układów uwalniania leków z wykorzystaniem nanorurek węglowych jako nośników.
A method called hot-melt deposition (HMD) has increasingly been reported in the pharmaceutical literature as a means of preparing of polymer drug deliver vehicles. HMD has been widely applied to disperse drugs in a matrix down to the molecular level. This tech nology gives new hope to the glass or solid solution approach as a delivery system for poorly soluble drugs. We discussed the results of systematic studies of paracetamol adsorption on closed, commercially available, unmodified carbon nanotubes and some active carbons. The results of thermal analysis, static and dynamic adsorption measurements, and molecular dynamics simulation lead to suggestion about the formation of paracetamol nanoaggregates in the interstitial spaces between nanotubes and in the pores in active carbons. Next we illustrate that the behavior of adsorbed paracetamol during heating leads to the creation of a new drug delivery system. This new system has different rate of drug deposition which depends of the type of applied carbons matrix as well as the parameters of process. Moreover, we show that the creation of nanoagreggates can be successfully applied in new drug delivery vehicles. Summing up, it should be pointed out that carbon nanotubes can be very promising materials for preparation of new drug delivery systems.

Źródło:

Inżynieria i Ochrona Środowiska; 2013, 16, 3; 323-330
1505-3695
2391-7253

Pojawia się w:

Inżynieria i Ochrona Środowiska

Dostawca treści:

Biblioteka Nauki

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Tytuł:

Study on the treatment of fluorine-containing wastewater by precipitation-adsorption process

Autorzy:

Li, Xiaochang
Lyu, Xianjun

Powiązania:

https://bibliotekanauki.pl/articles/24201032.pdf

Data publikacji:

2023

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

sewage
fluorine
activated carbon
adsorption
ścieki
fluor
węgiel aktywny
adsorpcja

Opis:

Fluorine-containing wastewater from the Yuncheng Sewage Treatment Plant in Heze City, Shan-dong Province was treated by coagulation and precipitation with poly aluminum sulfate, and CaO chemical precipitation-activated carbon adsorption, with a view to reducing fluoride ions concentration in the wastewater to below the discharge standard. The results showed that the optimum conditions for the coagulation-sedimentation test of poly aluminum sulfate were as follows: the dosage of poly aluminum sulfate 0.3 g/dm3, initial pH value 4.0, the removal rate of fluoride ion in the fluorine-containing wastewater reached 98.46%, and the concentration of fluoride ion was 0.462 mg/ dm3, which reached the discharge standard (1.5 mg/ dm3); The optimum conditions for the CaO chemical precipitation, and lanthanum loaded activated carbon adsorption method were as follows: the amount of CaO 20 g/ dm3, initial pH of the chemical precipitation test 8.0, the dosage of lanthanum loaded activated carbon 10 g/ dm3, and the initial pH of the adsorption test 6.0. At this time, the removal rate of fluoride ions in the fluorine-containing wastewater reached 95.81%, and the concentration of fluoride ions was 1.26 mg/ dm3, which also met the discharge standard.

Źródło:

Environment Protection Engineering; 2023, 49, 2; 55--73
0324-8828

Pojawia się w:

Environment Protection Engineering

Dostawca treści:

Biblioteka Nauki

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