Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

English (EN)·Polski (PL)·Yкраїнський (UK)
Przejdź do strony domowej biblioteki Centralna Biblioteka Wojskowa Link otwiera się w nowym oknie Logo biblioteki Prolib Integro - strona głównaCentralna Biblioteka Wojskowa

Wyszukujesz frazę "Langmuir-Freundlich" wg kryterium: Temat

  Lista filtrów
Wyrównaj
Wyświetlanie 1-15 z 20
Tytuł:
Ferric hydroxide-based media for removal of toxic arsenic species. Kinetic, equilibrium and thermodynamic studies
Autorzy:
Szlachta, M.
Wójtowicz, P.
Powiązania:
https://bibliotekanauki.pl/articles/207931.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Freundlich isotherm
Langmuir isotherm
arsenic
adsorption
sewage
izoterma Freundlicha
izoterma Langmuira
arsen
adsorpcja
ścieki
Opis:
Adsorption studies were conducted to assess the feasibility of ferric hydroxide-based material for treatment of highly arsenic-contaminated effluents. The experiments were performed in a batch adsorption regime using a synthetic aqueous solution. The contact time between arsenic ions and the adsorbent, initial concentration of arsenic in treated solution, temperature of solution and adsorbent dose had a significant effect on the adsorption performance in the system. Both the mechanism of the process involved and the rate of As(III) and As(V) adsorption were analyzed based on pseudo-firstand pseudo-second order kinetic models. The adsorption data at constant temperature were described by the Langmuir and Freundlich isotherm equation, and the theoretical adsorption capacity of ferric hydroxide was determined to be 43.75 mg/g and 44.04 mg/g for arsenic(III) and (V), respectively. The estimated thermodynamic parameters, including changes in free energy, enthalpy and entropy, revealed that the adsorption is spontaneous and endothermic under applied experimental conditions.
Źródło:
Environment Protection Engineering; 2018, 44, 4; 117-129
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Assessment of the sorption properties of materials proposed for the construction of insulation barriers
Autorzy:
Sobik-Szołtysek, J.
Bień, J.
Grosser, A.
Powiązania:
https://bibliotekanauki.pl/articles/207055.pdf
Data publikacji:
2016
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
acid solution
batch methods
Insulation barriers
landfill site
Langmuir isotherm
Freundlich isotherm
mineral wastes
roztwor kwasu
metoda wsadowa
bariera izolacyjna
składowiska odpadów
izoterma Langmuira
izoterma Freundlicha
odpady mineralne
Opis:
Sorption properties of fine-grain mixtures of mineral waste proposed for construction of separation screens in landfill sites have been examined. The removal of heavy metals by the mixtures analysed was evaluated by the static batch method. It was found that they characterize by high ability to remove heavy metals at the level of over 99%, even with high contents of these elements. The sorption parameters have been determined based on the Langmuir and Freundlich isotherms. The alkaline character of some components of mixtures provides stabilization of pH, preventing removal of heavy metals to the environment in response to contact a barrier with acid solutions.
Źródło:
Environment Protection Engineering; 2016, 42, 1; 169-189
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption Studies of Nitrate by Geo-Physical Environment (Laterite soil) of the Study Area Bidar Urban & its Industrial Area, Karnataka State, India
Autorzy:
Shivasharanappa, ---
Padaki, S.
Kushtagi, S.
Powiązania:
https://bibliotekanauki.pl/articles/971327.pdf
Data publikacji:
2013
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Nitrate Adsorption
laterite
Batch Experiments
Freundlich isotherm
Langmuir isotherm
Opis:
In the present work, adsorption of Nitrate on Laterite soil has been studied using batch adsorption techniques. Main objectives of this study is to study the physical properties of Laterite soil, detection of Nitrate removal by adsorbent Laterite soil as a function of contact time, adsorbent dosage, pH, to study sorption kinetics, and to study isothermal pattern. The results of this study showed that the Optimum contact time, Optimum dosage and Optimum pH for adsorption of Nitrate on Laterite soil reached to equilibrium after 130 minutes, with removal efficiency of 68 %, 1400 mg as optimum dosage and at optimum pH of 6. The rate of adsorption of Nitrate obeys first order rate equation. The obtained results of the batch experiments are best fitted to Langmuir and Freundlich adsorption isotherms. From the experimental analysis it is concluded that Laterite soil shows good removal efficiency and hence can be used as adsorbent.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2013, 6; 66-76
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sorption process of Acid Yellow 36 on sludge-based activated carbon
Sorpcja barwnika Acid Yellow 36 za pomocą węgla aktywnego wytworzonego z osadu czynnego
Autorzy:
Pieczykolan, B.
Płonka, I.
Powiązania:
https://bibliotekanauki.pl/articles/127410.pdf
Data publikacji:
2016
Wydawca:
Towarzystwo Chemii i Inżynierii Ekologicznej
Tematy:
sewage sludge
activated carbon
dyes
sorption isotherm
sorption kinetics
Freundlich isotherm
Langmuir isotherm
osad czynny
węgiel aktywny
barwniki
izoterma sorpcji
kinetyka sorpcji
izoterma Freundlicha
izoterma Langmuira
Opis:
The study of sorption of dye Acid Yellow 36 on SAC (sludge-based activated carbon) was conducted. For this purpose, anaerobically digested and dewatered sewage sludge was dried at 105ºC to constant weight. Next this sludge was milled to a particle with a diameter of 0.5-1.0 mm and subjected to chemical activation by hydrogen peroxide. After oxidation process the sludge was subjected to thermal transformation in a muffle furnace at 600ºC. In this way obtained a powder activated carbon based on activated sludge (so-called SAC). Based on the results of the study the most favorable parameters of sorption process was achieved as follows: pH value equaled to 2.5 and reaction time equaled to 30 minutes. The linearized forms of Freundlich and Langmuir isotherms showed that the highest value of correlation factor was obtained in the case of Langmuir model. However, in this case, the negative value of constant isotherm was achieved. Therefore, it can be assumed that more accurately in this case is the Freundlich model or other model which was not examined during that studies.
Przeprowadzono badania sorpcji barwnika Acid Yellow 36 z użyciem węgla aktywnego bazującego na osadzie ściekowym. W tym celu ustabilizowany beztlenowo i odwodniony osad czynny wysuszono w 105ºC do stałej masy. Następnie osad ten zmielono do ziaren o średnicy 0,5-1,0 mm i poddano chemicznej aktywacji za pomocą nadtlenku wodoru. Po tym procesie osad spalono w piecu muflowym w 600ºC, uzyskując w ten sposób pylisty węgiel aktywny bazujący na osadzie czynnym (tzw. SAC - czyli „sludge-based activated carbon”). Dla tak spreparowanego węgla aktywnego przeprowadzono badania procesu sorpcji statycznej względem barwnika Acid Yellow 36. Na podstawie przeprowadzonych eksperymentów stwierdzono, że najkorzystniejsza wartość pH wynosi 2,5, a czas kontaktu jest równy 30 minut. Natomiast bazując na graficznych formach zlinearyzowanych modelów sorpcji według Langmuira i Freundlicha, stwierdzono, że największą wartość współczynnika korelacji odnotowano w przypadku zlinearyzowanej formy równania Langmuira. Jednakże w tym przypadku uzyskano ujemne wartości stałych izotermy, dlatego można przypuszczać, że jednak bardziej prawidłowy jest model Freundlicha lub inny rodzaj izotermy, który nie był analizowany w toku tych badań.
Źródło:
Proceedings of ECOpole; 2016, 10, 1; 67-73
1898-617X
2084-4557
Pojawia się w:
Proceedings of ECOpole
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adsorption of Congo Red Dye Using Rice Husk
Autorzy:
Omokpariola, Daniel Omeodisemi
Otuosorochi, Joy Njoku
Powiązania:
https://bibliotekanauki.pl/articles/1031769.pdf
Data publikacji:
2020
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Congo red
Freundlich model
Langmuir models
Rice husks powder
Van’t Hoff equation
adsorption
kinetics
thermodynamics
Opis:
The potential of rice husks powder (RHP), for the removal of Congo red dye from aqueous solution was investigated. Batch adsorption studies were conducted and various parameters such as contact time, adsorbent dosage, initial dye concentration, pH and temperature were studied to observe their effects in the dye adsorption process. The optimum conditions for the adsorption of CR onto the adsorbent (RHP) was found to be: contact time (100 min) pH (10.0) and temperature (303 K) for an initial dye concentration of 50 mg/l and adsorbent dose of 1.0 g respectively. The experimental equilibrium adsorption data fitted best and well to the Freundlich Isotherm model for both dyes adsorption. The maximum adsorption capacity was found to be 33.88 mg/g for the adsorption of CR dye. The kinetic data conformed to the pseudo second order kinetic model. Thermodynamic quantities such as Gibbs free energy (ΔGº), enthalpy (ΔHº) and entropy (ΔSº) were evaluated and the negative values of ΔGº, ΔHº and ΔSº obtained indicate the spontaneous and exothermic nature of the adsorption process.
Źródło:
World Scientific News; 2020, 150; 22-38
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Enhancing adsorption capacity of clay and application in dye removal from waste water
Autorzy:
Ogunmodede, O. T.
Adebayo, O. L
Ojo, A. A.
Powiązania:
https://bibliotekanauki.pl/articles/412039.pdf
Data publikacji:
2014
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
snail shell
methylene blue
natural clay
langmuir
freundlich
temkin
Halsey and Harkins-Jura isotherm equations
Opis:
Natural clay has been considered as a potential absorbent for removing pollutants from water and waste water. Nonetheless, the effective application of clay for water treatment is limited due to small surface area and presence of net negative surface charge, leading to it low adsorption capacity. The absorption capacity was boosted via intercalation of CaO derived from snail shell (SS). The methylene blue sorption potential, PZC, and the surface area of unmodified clay sample were substantially enhanced by the intercalation process. The process of sorption of MB from solution was analyzed using five different isotherm models (Langmuir, Freundlich, Temkin, Harkins-Jura, and Halsey isotherm equations). The value of the Langmuir monolayer sorption capacity qm (mg/g) increased from 50.12 to 88.71, PZC values increased from 4.50 to 7.40, and the surface area (m2/g) value increased from 27 m2/g to 123 m2/g after the intercalation process. The experimental data were fitted into two kinetic models: Lagergren pseudo-first order and the chemisorptions pseudo-second order. It was observed that chemisorptions pseudo-second order kinetic model described the sorption process with high coefficients of determination (r2) better than pseudo first other kinetic models. The modification caused no change in the clay surficial microstructure but increased the lattice spacing of the clay framework.
Źródło:
International Letters of Chemistry, Physics and Astronomy; 2014, 20, 1; 35-51
2299-3843
Pojawia się w:
International Letters of Chemistry, Physics and Astronomy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Ability of Peat in Adsorption of Biogenic Elements from Water Environment
Autorzy:
Matsuska, Oksana
Suchorska, Olga
Gumnitsky, Jaroslaw
Powiązania:
https://bibliotekanauki.pl/articles/124877.pdf
Data publikacji:
2020
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
wastewater
ammonium nitrogen
phosphates
adsorption
peat
adsorption isotherms
coefficient of determination
Langmuir model
Freundlich model
Opis:
The possibilities of using a natural sorbent – peat for the wastewater treatment of ammonium ions and phosphates discharged from runoff into natural reservoirs at high concentrations were investigated. The peat of from the Vereshchytsya-Yanovske deposit of Ukraine of two depths: lowland and upland, was studied. It was established that the lowland samples of peat have higher sorption properties to the investigated pollutants from the aquatic environment than the upland ones. A greater moisture loss in the lowland peat species was observed, as well as the major part of the plant fibers in its structure, which explains its sorption properties. Due to the high content of humic substances, the extraction of cations from the water by peat can occur due to the ion exchange. The adsorption isotherms of both ammonium and phosphate ions on the top and lowland peat species of the Vereshchytsya-Yanovske deposit were constructed and presented. The adsorption isotherm obtained in the experimental studies was used to mathematically establish the isotherm equation, using the Langmuir and Freundlich models to describe the equilibrium of the sorption processes under study. The degree of appropriation of linear equations to the experimental data was evaluated on the basis of the deterministic coefficient, which enabled to determine that in each case the Langmuir equations describe the adsorption isotherms more adequately.
Źródło:
Journal of Ecological Engineering; 2020, 21, 4; 224-230
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Biosorption Performance of Biodegradable Polymer Powders for the Removal of Gallium(III) ions from Aqueous Solution
Autorzy:
Lee, Ching-Hwa
Lin, Hang-Yi
Cadogan, Elon I.
Popuri, Srinivasa R.
Chang, Chia-Yuan
Powiązania:
https://bibliotekanauki.pl/articles/778539.pdf
Data publikacji:
2015
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
chitosan
crab shell powder
gallium
Langmuir-Freundlich
kinetics
Opis:
Gallium (Ga) is considered an important element in the semiconducting industry and as the lifespan of electronic products decrease annually Ga-containing effluent has been increasing. The present study investigated the use of biodegradable polymer powders, crab shell and chitosan, in the removal of Ga(III) ions from aqueous solution. Ga(III) biosorption was modeled to Lagergren-first, pseudo-second order and the Weber-Morris models. Equilibrium data was modeled to the Langmuir, Freundlich and Langmuir-Freundlich adsorption isotherms to determine the probable biosorption behavior of Ga(III) with the biosorbents. The biosorbents were investigated by Fourier Transform Infrared Spectroscopy, X-ray Diffraction and Scanning Electron Microscopy/Energy Dispersive Spectra analysis.
Źródło:
Polish Journal of Chemical Technology; 2015, 17, 3; 124-132
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removal of 2,4,6-trichlorophenol from aqueous solutions using agricultural waste as low-cost adsorbents
Autorzy:
Kuśmierek, K.
Świątkowski, A.
Dąbek, L.
Powiązania:
https://bibliotekanauki.pl/articles/207901.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
activated carbon
heavy metals
Langmuir isotherm
Freundlich models
węgiel aktywny
metale ciężkie
odpady rolnicze
izoterma Langmuira
Opis:
Agricultural waste products including sunflower seed hulls, pumpkin seed shells, walnut shells and peanut shells were used as low-cost adsorbents for the removal of 2,4,6-trichlorophenol (TCP) from aqueous solutions. The effects of adsorbent dosage, pH and ionic strength on the adsorption of TCP were investigated. The results showed that the adsorption of TCP was pH dependent and increased upon increasing the ionic strength of the solution. The adsorption kinetics was found to follow a pseudo-second order kinetics. The equilibrium adsorption data were fitted to the Langmuir, Freundlich and Sips isotherms and the best results were achieved with the Freundlich model. The desorption of TCP using deionized water, water/methanol mixture or 5% sodium hydroxide was also studied. The results suggest that the tested materials may be used as an effective adsorbents without any treatment or any other modification for removal of TCP from the aqueous medium.
Źródło:
Environment Protection Engineering; 2017, 43, 4; 149-163
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Thermodynamics and adsorption studies of dye (rhodamine-b) onto natural diatomite
Autorzy:
Koyuncu, M.
Kul, A. R.
Powiązania:
https://bibliotekanauki.pl/articles/110287.pdf
Data publikacji:
2014
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
diatomite
rhodamine B
adsorption
thermodynamics
Langmuir isotherm
Freundlich isotherm
Opis:
Thermodynamics and adsorption studies were conducted with a dye of rhodamine-B on natural diatomite. Adsorption of the dye was investigated with an initial dye concentration at pH 8±0.2, 303, 313 and 323 K. The adsorption experiments were carried out isothermally at three different temperatures. The Langmuir and Freundlich isotherm models were used to describe the equilibrium data and the results were discussed in details. The kinetic data agreed with the pseudo-first order model with rate constants (k2) in the range of 3.05–1.59.10–1 g/mg min. The thermodynamic parameters such as standard free energy, entropy change and enthalpy were calculated for natural diatomite. These values showed that adsorption of rhodamine-B on natural diatomite was a spontaneous and endothermic process.
Źródło:
Physicochemical Problems of Mineral Processing; 2014, 50, 2; 631-643
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Uptake of phosphates from water solutions on metallurgical sludge
Autorzy:
Kostura, Bruno
Huczala, Radim
Klika, Zdeněk
Ritz, Michal
Bartoňová, Lucie
Matýsek, Dalibor
Powiązania:
https://bibliotekanauki.pl/articles/2032862.pdf
Data publikacji:
2021
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
phosphates
heavy metals
Langmuir isotherm
Freundlich isotherm
fosforany
metale ciężkie
izoterma Langmuira
izoterma Freundlicha
Opis:
Steel-making dust slurry (SS) and convertor dust slurry (CS) were tested for uptake of phosphates from aqueous solutions. The adsorption of phosphates on SS and CS corresponded well with both Langmuir and Freundlich adsorption isotherms, which indicated the combination of physical and chemical processes. The maximum adsorbed amount of phosphates on both dust slurry samples was ca. 11 mg P/g. The study evaluates also the effect of acidic leaching on the retention characteristics of both dust slurry samples. From the slurry samples prepared by acidic leaching, the leached convertor dust slurry (CSL) was the only sample capable to retain phosphates. To reveal the retention mechanisms of phosphates, the original and leached dust slurry samples were analyzed by IR and Raman spectroscopy. Co-precipitation of Ca and Fe phosphates, or surface complexation of phosphates were evaluated as the retention mechanisms of CS and CSL while the retention of phosphates by zincite in the case of SS is probably based on their adsorption.
Źródło:
Environment Protection Engineering; 2021, 47, 3; 37-51
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removal of Ni(II) ions from aqueous solutions using manganese oxide nanoparticles from buffelgrass, Cenchrus ciliaris L., as green adsorbent. Kinetics and thermodynamic studies
Autorzy:
Kiruba, Dunston Angeline
Muthukumaran, Karpagasundaram
Thamarai, Perumal
Powiązania:
https://bibliotekanauki.pl/articles/2057616.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
Cenchrus ciliaris L.
ecosystem
Langmuir isotherm
Freundlich isotherm
heavy metals
ekosystem
izoterma Langmuira
izoterma Freundlicha
metale ciężkie
Opis:
Manganese oxide nanoparticles (MnONPs) synthesized from buffelgrass, Cenchrus ciliaris (L.), an invasive weed posing threats to ecosystems, are used in this study to remove nickel(II) ions from aqueous solutions. As a biosorbent, the synthesized MnONPs were put to the test. MnONPs were studied for their surface morphology and functional properties. A variety of adsorbent dosages and contact times were tested in batch experiments to see how they affected adsorption rates. At pH 6.0 and room temperature, MnONPs had an 87.1% removal efficiency for Ni(II) ions. Pseudo-second order correlations had a higher R2 value (0.988). In the Langmuir plot, a maximum adsorption capacity of 4.78 mg/g was observed. However, the experimental data fitted well with both Langmuir and Freundlich isotherm models (R2 = 0.99). Spontaneous and exothermic was the nature of the adsorption process. To remove heavy metal ions contaminants from aqueous solutions, these results suggested that MnONPs synthesized from buffelgrass extract could be used.
Źródło:
Environment Protection Engineering; 2022, 48, 1; 135--149
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Removal of Heavy Metal by Ion Exchange Using Bentonite Clay
Autorzy:
Hussain, Shaymaa Talib
Ali, Seroor Atalah Khaleefa
Powiązania:
https://bibliotekanauki.pl/articles/1839579.pdf
Data publikacji:
2021
Wydawca:
Polskie Towarzystwo Inżynierii Ekologicznej
Tematy:
bentonite
lead ion
copper ion
adsorption
wastewater
Freundlich isotherm
Langmuir isotherm
Opis:
Bentonite clay was utilized in this research as adsorbent element to remove the lead and copper ions from wastewater. Series of tests were performed at multiple parameters, such as pH solution, initial concentration of lead and copper ions, adsorbent mass, and contact time. The greatest removal was attained at pH 5, adsorbent weight of 0.5 g, initial heavy metal concentration of 10 mg/l, and a contact time of 60 minutes. The results revealed that bentonite clay is suitable in the removal of metal ions from polluted water. The ion exchange rate of lead was faster than that of copper. The isotherm for the adsorption of the lead and copper ions on bentonite clay was confirmed by the Freundlich and Langmuir isotherms which offered good consequences. The results indicated that bentonite was utilized as an efficient ion exchange element for the removal of heavy metal ions from polluted water. Fourier Transformed Infrared Spectrophotometer (FTIR) images of bentonite clay before and after adsorption showed the imbibition of metal ions by bentonite clay.
Źródło:
Journal of Ecological Engineering; 2021, 22, 1; 104-111
2299-8993
Pojawia się w:
Journal of Ecological Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Adsorpcja wybranych barwników z roztworów wodnych na nanoporowatych materiałach węglowych otrzymanych z prekursorów polimerowych
Adsorption of dyes from aqueous solutions on nanoporous carbon materials obtained from polymeric precursors
Autorzy:
Czubaszek, M.
Choma, J.
Powiązania:
https://bibliotekanauki.pl/articles/237872.pdf
Data publikacji:
2017
Wydawca:
Polskie Zrzeszenie Inżynierów i Techników Sanitarnych
Tematy:
porous carbon materials
adsorption isotherm
dyes
orange II
methyl orange
methylene blue
Langmuir's equation
Freundlich equation
Langmuir-Freundlich equation
iodine number
methylene number
porowate materiały węglowe
izoterma adsorpcji
barwniki
oranż II
oranż metylowy
błękit metylenowy
równanie Langmuira
równanie Freundlicha
równanie Langmuira-Freundlicha
liczba metylenowa
Opis:
Adsorption of orange II, methyl orange and methylene blue from aqueous solutions on three carbon materials was studied. The first material for studies was the microporous activated carbon obtained from sulfonated styrene- divinylbenzene resin (AC-SDVB), the second – ordered mesoporous carbon obtained from phenol-formaldehyde resin (OMC-PF) and the third – commercial micro-mesoporous activated carbon from Chemviron Carbon (AC-F400). Adsorption isotherms of the above-mentioned dyes on the carbon materials were studied under laboratory conditions at 25 C. The experimental data was described using the well-known Langmuir, Freundlich and Langmuir-Freundlich adsorption isotherm equations. On the basis of the correlation coefficient (R2) value, it was demonstrated that the Langmuir equation best described this data. The maximum adsorbed amounts for the three dyes were determined. The highest value was obtained for AC-SDVB: 625 mg/g for orange II and about 500 mg/g for methyl orange and methylene blue. These values were approximately five times higher than the maximum adsorption values for individual dyes on OMC-PF and AC-F400 (maximum adsorption values were about 100 mg/g). The difference in the effectiveness of dye adsorption on the carbon materials tested was the result of a much more developed porous structure of carbon AC-SDVB, compared to other two carbons. The specific surface area of AC-SDVB was 2 480 m2/g, 660 m2/g – for OMC-PF and 1 260 m2/g – for AC-F400. In addition, the values of standard characteristic numbers for activated carbons, methylene number and iodine number, were also evaluated. The highest value of both the methylene number, equal to 30 cm3, and the iodine number of 1 900 mg/g were obtained for AC-SDVB. In conclusion, some of the porous carbon materials obtained from polymers, characterized by excellent structural parameters, are particularly efficient in adsorption of dyes from aqueous solutions.
Badano adsorpcję trzech wybranych barwników organicznych (oranż II, oranż metylowy i błękit metylenowy) z roztworów wodnych na trzech materiałach węglowych. Pierwszym był mikroporowaty węgiel aktywny otrzymany z żywicy styrenowo-dwuwinylobenzenowej (AC-SDVB), drugim – uporządkowany węgiel mezoporowaty otrzymany z żywicy fenolowo-formaldehydowej (OMC-PF), a trzecim – handlowy mikro-mezoporowaty węgiel aktywnym firmy Chemviron Carbon (AC-F400). W warunkach laboratoryjnych wyznaczono doświadczalne izotermy adsorpcji tych barwników na węglach aktywnych w temperaturze 25C. Otrzymane dane doświadczalne opisano za pomocą znanych równań izoterm adsorpcji – Langmuira, Freundlicha oraz Langmuira-Freundlicha. Na podstawie wartości współczynnika korelacji (R2) stwierdzono, że najlepiej dane doświadczalne opisywało równanie izotermy Langmuira. Na podstawie otrzymanych izoterm adsorpcji wyznaczono maksymalne wartości adsorpcji poszczególnych barwników na badanych materiałach węglowych. Największą wartość adsorpcji uzyskano na węglu AC-SDVB – 625 mg/g (w przypadku oranżu II) oraz około 500 mg/g (w przypadku oranżu metylowego i błękitu metylenowego). Wartości te były około pięciokrotnie większe od maksymalnych adsorpcji poszczególnych barwników na węglach OMC-PF i AC-F400 (węgle te charakteryzowały sie maksymalną wartością adsorpcji każdego barwnika wynoszącą około 100 mg/g). Różnica w skuteczności adsorpcji barwników na badanych węglach była efektem znacznie lepiej rozwiniętej struktury porowatej węgla AC-SDVB, w porównaniu z pozostałymi węglami. Powierzchnia właściwa węgla AC-SDVB wynosiła 2480 m2/g, węgla OMC-PF – 660 m2/g, a węgla AC-F400 – 1260 m2/g. Ponadto wyznaczono wartości standardowych liczb charakteryzujących węgle aktywne – liczbę metylenową i liczbę jodową. Największą wartość zarówno liczby metylenowej (30 cm3), jak i liczby jodowej (1900 mg/g) otrzymano w przypadku węgla AC-SDVB. Badania wykazały, że niektóre porowate materiały węglowe otrzymane z polimerów, charakteryzujące się bardzo dobrymi parametrami struktury porowatej, wyjątkowo dobrze nadają się do adsorpcji barwników z roztworów wodnych.
Źródło:
Ochrona Środowiska; 2017, 39, 2; 3-10
1230-6169
Pojawia się w:
Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 20

Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies