Skocz do pozycji: 1.

Tytuł:

Adsorption effectiveness and adsorption efficiency of chosen surfactants

Autorzy:

Rekiel, Edyta Ada

Powiązania:

https://bibliotekanauki.pl/articles/2079921.pdf

Data publikacji:

2019

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej

Tematy:

surfactants
biosurfactants
adsorption
adsorption effectiveness
adsorption efficiency

Opis:

Surfactants are various types of chemical compounds that are present in almost every aspect of our life. They are used in many branches of industry, especially in food, cosmetics, pharmaceuticals and even in confectionery. They are considered one of the best solutions for oil residues, soil bioremediation and dealing with PAHs contaminations. Their versatility comes from their amphiphilic build – one part of the compound has hydrophilic properties (head), the other has hydrophobic properties (tail). This fact causes surfactants affinity both to polar and nonpolar compounds. Some of the classical surfactants still can affect fauna and flora by accumulating in ground waters or simply by causing allergies. In that case, many companies decide to limit their surfactant usage and reach for substances present in nature which have very similar, if not better, properties. Biosurfactants are surface active agents produced mainly by microorganisms such as bacteria, fungi and yeasts. There are many papers related to different properties (CMC, aggregation number, surface excess concentration) of various types of surfactants. However, it is difficult to find papers describing the same properties for different surfactants. In this study, adsorption effectiveness and adsorption efficiency at the water-air interface of chosen surfactants: sodium dodecylsulfate (SDDS), cationic: cetyltrimetylammonium bromide (CTAB), nonionic: Triton X-100 (TX-100) and biosurfactants: surfactin (SF) and monorhamnolipid (RL)  has been compared. Both efficiency and effectivenes decide about the practical surfactants application.

Źródło:

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2019, 74, 2; 25-39
2083-358X

Pojawia się w:

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Adsorption Potential Theory for Description of n-Butane Adsorption on Activated Carbon

Autorzy:

Bałys, Mieczysław
Szczurowski, Jakub
Czepirski, Leszek A.
Kochel, Marek

Powiązania:

https://bibliotekanauki.pl/articles/764132.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej

Tematy:

adsorption
activated carbon
butane adsorption, adsorption potential therory
heat of adsorption

Opis:

Potential theory of adsorption was used for description of adsorption isotherms of n-butane on microporous active carbon. It was shown that characteristic curve of adsorption can be treated as specific form of thermal equation of adsorption giving the possibility to calculate and predict both equilibrium and thermodynamic characteristics of adsorption in wide range of temperature and relative pressure. The results can be used for the design of adsorption systems and for predicting adsorption equilibrium behavior of binary and/or multicomponent gaseous mixtures on active carbon under wide range of conditions, without time consuming and expensive experimental determination.

Źródło:

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2016, 71, 2
2083-358X

Pojawia się w:

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Experimental study on the adsorption refrigeration device built on a water-silica gel working pair

Autorzy:

Szelągowski, Adam
Trzcinkowski, Piotr

Powiązania:

https://bibliotekanauki.pl/articles/132051.pdf

Data publikacji:

2019

Wydawca:

Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.

Tematy:

adsorption refrigeration
adsorption
water-silicagel

Opis:

Due to increasing restriction put on compressor based cooling, adsorption cooling has been increasing its popularity. Abovementioned restrictions forces usage of ecological refrigerants, such as water. Additional advantage of adsorption devices is possibility to use low-grade waste heat source or solar energy as the main driving energy instead of electricity. This trend has lead to significant development of adsorption based branch in cooling industry over past 30 years. The paper presents the results of experimental research for an adsorption refrigeration device built of two deposits. Water-silica gel was chosen as the working pair, because this solution allows to work at the lowest drive temperatures. As a result of the experiment, EER coefficients were obtained at the level of 0.57-0.82 and SCP coefficients in the range from 8 to 21 W/kg. The results allow to conclude that adsorption devices can, in many cases compete with compressor solutions.

Źródło:

Modern Engineering; 2019, 1; 42-54
2450-5501

Pojawia się w:

Modern Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Sorption of the acid dyes onto strongly basic anion exchanger: Kinetic and equilibrium studies

Autorzy:

Greluk, M.
Hubicki, Z.
Wołowicz, A.

Powiązania:

https://bibliotekanauki.pl/articles/115757.pdf

Data publikacji:

2011

Wydawca:

Fundacja na Rzecz Młodych Naukowców

Tematy:

adsorption isotherms
adsorption kinetics
acid dyes
resin

Opis:

The strong base acrylic anion exchangers, Amberlite IRA-458, was used as an adsorbent for the investigation of acid dyes (Acid Orange 7, Acid Orange 10 and Acid Red 88) adsorption kinetics and isotherms. The pseudo-fi rst order and pseudo-second order kinetic models were used to analyze the kinetic data and good agreement between the experimental and calculated amounts of dye adsorbed at equilibrium were obtained for the pseudo-second order kinetic models for the entire investigated concentrations domain in the case all three investigated dyes. The adsorption equilibrium data were analyzed by the Langmuir and Freundlich isotherm models with the best fitting being the first one.

Źródło:

Challenges of Modern Technology; 2011, 2, 1; 74-78
2082-2863
2353-4419

Pojawia się w:

Challenges of Modern Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Removal of quinoline from aqueous solutions by lignite, coking coal and anthracite. Adsorption isotherms and thermodynamics

Autorzy:

Xu, H.
Huagn, G.
Li, X.
Gao, L.
Wang, Y.

Powiązania:

https://bibliotekanauki.pl/articles/110016.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

quinoline adsorption
coking coal
adsorption isotherms
thermodynamics

Opis:

Based on the concept of circular economy, a novel method of industrial organic wastewater treatment by using adsorption on coal is introduced. Coal is used to adsorb organic pollutants from coking wastewaters. After adsorption, the coal would be used for its original purpose, its value is not reduced and the pollutant is thus recycled. Through systemic circulation of coking wastewater zero emissions can be achieved. Lignite, coking coal and anthracite were used as adsorbents in batch experiments. The quinoline removal efficiency of coal adsorption was investigated. The coking coal and anthracite exhibited properties well-suited for adsorption onto both adsorbents. The experimental data were fitted to Langmuir and Freundlich isotherms as well as Temkin, Redlich–Peterson (R-P) and Dubinin-Radushkevich (D-R) models. Both Freundlich Isotherm and D-R model provided reasonable models of the adsorption process. The thermodynamic parameters of quinoline adsorption on coking coal were calculated. The thermodynamic parameters indicated that the adsorption process is exothermic and is a physical adsorption. The △S° value indicated that the adsorption entropy decreased because the adsorbate molecule was under restrictions after it adsorption on the coal surface. The coal adsorption method for removing refractory organic pollutants is a great hope for achieving zero emission waste water for a coking plant.

Źródło:

Physicochemical Problems of Mineral Processing; 2016, 52, 1; 214-227
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Removal of quinoline from aqueous solutions by lignite, coking coal and anthracite. Adsorption kinetics

Autorzy:

Xu, H.
Wang, Y.
Huagn, G.
Fan, G.
Gao, L.
Li, X.

Powiązania:

https://bibliotekanauki.pl/articles/110664.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

quinoline adsorption
coking coal
kinetics
adsorption activation energy
coal adsorption

Opis:

Basing on the concept of circular economy, a novel method of industrial organic wastewater treatment by using adsorption on coal is introduced. Coal is used to adsorb organic pollutants from coking wastewaters. After adsorption, the coal would be used in its original purpose, as its value was not reduced and the pollutant was reused. Through the systemic circulation of coking wastewater zero emissions can be achieved. Lignite, coking coal and anthracite were used as adsorbents in batch experiments. The quinoline removal efficiency of coal adsorption was investigated. Both the coking coal and anthracite exhibited properties well-suited for quinoline adsorption removal. The experimental data were fitted to the pseudo-first- order and pseudo-second-order kinetic equations as well as intraparticle diffusion and Bangham models. An attempt was made to find the rate-limiting step involved in the adsorption processes. Both boundary-layer diffusion and intraparticle diffusion are likely involved in the rate-limiting mechanisms. Effect of pH on coal adsorptions by coking coal was investigated. The process of quinoline adsorption on coal was researched. The coal adsorption method for removing refractory organic pollutants is a great hope for achieving wastewater zero emission for coking plants.

Źródło:

Physicochemical Problems of Mineral Processing; 2016, 52, 1; 397-408
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Adsorption behaviors of typical aromatic pollutants in biologically treated coking wastewater on powdered coal

Autorzy:

Sun, H.
Wang, Y.
Bian, Y.
He, X.
Li, G.

Powiązania:

https://bibliotekanauki.pl/articles/110777.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

aromatic pollutants
wastewater treatment
adsorption affinity
competitive adsorption

Opis:

The raw coal was utilized as adsorbent based on its remarkable adsorption ability of coal slime to organic compounds in the flotation process. This paper mainly investigates adsorption behaviors of benzpyrole (BZP), pyrrole (PR) and benzoic acid (BA) on powdered coal (PC). In the monocomponent solution, the removal efficiencies of BZP, PR and BA reached 85.23%, 55.02% and 24.84% at PC dosage of 20 g/dm3. Adsorption behaviors of three pollutants fitted perfectly to the pseudo-second order kinetics model and liquid film diffusion occupied the largest proportion in rate-limiting step according to the diffusion rates. Furthermore, the influences of pH on adsorption behaviors and competitive adsorption mechanism of three pollutants were also reported.

Źródło:

Physicochemical Problems of Mineral Processing; 2018, 54, 2; 496-504
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

Kinetics of marine surfactant adsorption at an air-water interface. Baltic Sea studies

Autorzy:

Pogorzelski, S.J.
Kogut, A.D.

Powiązania:

https://bibliotekanauki.pl/articles/48394.pdf

Data publikacji:

2001

Wydawca:

Polska Akademia Nauk. Instytut Oceanologii PAN

Tematy:

coastal water
water interface
surface adsorption
marine film
kinetics
Baltic Sea
adsorption barrier
adsorption

Opis:

The paper contains the results of studies of natural surface film adsorption kinetics carried out in inland waters and in shallow offshore regions of the Baltic Sea during 2000–01 under calm sea conditions. The novel approach presented here for the adsorption dynamics is based on the mixed kinetic-diffusion model and analyses of the surface pressure-time plots at short (t → 0) and long (t→∞) adsorption time intervals. Values of the effective relative diffusion coefficient Deff/D (= 0.008 − 0.607) and energy barrier for adsorption Ea/RT (= 0.49 − 7.10) agree well with the data reported for model non-ionic surfactant solutions of pre-cmc concentrations. Wind speed is one of the factors affecting the adsorption barrier via the increased surface pressure of the natural film exposed to wind shear stress (∼ U10 2),a nd enters the relation Ea/RT = 1.70U10 1/3.

Źródło:

Oceanologia; 2001, 43, 4
0078-3234

Pojawia się w:

Oceanologia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Kinetic studies on sorption of ni(ii) and cd(ii) from chloride solutions using selected acidic cation exchangers

Autorzy:

Otrembska, P.
Gega, J.

Powiązania:

https://bibliotekanauki.pl/articles/110403.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

sorption
nickel
cadmium
adsorption kinetics
adsorption isotherm

Opis:

Sorption of nickel(II) and cadmium(II) ions from chloride solutions was tested. Three different strongly acidic cation exchangers, i.e. Lewatit MonoPlus SP 112, Amberlite 200C and Amberlyst 15, were used. Effects of phase contact time, pH and initial concentration of metal ions on equilibrium and kinetics of sorption by batch methods were studied. It was showed that sorption of Ni(II) and Cd(II) could be described by the pseudo-second order equation. Experimental results data were analyzed using the Langmuir and Freundlich isotherms. Sorption of Ni(II) and Cd(II) onto investigated resins followed the Langmuir isotherm.

Źródło:

Physicochemical Problems of Mineral Processing; 2013, 49, 1; 301-312
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Removal of methylene blue from aqueous solution by adsorption onto activated carbon prepared from animal bone and corncob – an agricultural waste

Autorzy:

Ezeugo, J. N. O.

Powiązania:

https://bibliotekanauki.pl/articles/1111953.pdf

Data publikacji:

2018

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Adsorbate
Adsorbent
Adsorption
Synthetic dye
adsorption isotherm
methylene blue

Opis:

Synthetic dyes are widely used in the rubber, textiles, plastics, paper and cosmetics industries to color their products. The effectiveness of adsorption for dye removal from wastewater has made it an ideal alternative to other expensive treatment methods. This study investigates the physicochemical properties of animal-bone- (AB) and corncob- (CC) derived activated carbon on the removal of methylene blue dye. The effects of condition variables such as initial dye concentration, adsorbent dose, pH and contact time were studied. The results show that animal-bone-derived activated carbon has better potential for dye removal than does the corn cob-derived equivalent. AB revealed a higher adsorption capacity of intensity (2.40) and is of higher surface area - 500 m2g–1, while CC has adsorptive capacity of 1.25, intensity of 2.80 and surface area of 420 m2/g–1. What is more, the removal efficiency increases as adsorbent dose increases. This makes it an interesting option for dye removal from aqueous solutions of dye.

Źródło:

World News of Natural Sciences; 2018, 19; 32-44
2543-5426

Pojawia się w:

World News of Natural Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Kinetics and isotherm modelling of Zn(II) ions adsorption onto mine soils

Autorzy:

Jalayeri, H.
Salarirad, M. M.
Ziaii, M.

Powiązania:

https://bibliotekanauki.pl/articles/110575.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

copper mine soil
Zn(II)
adsorption kinetic
adsorption isotherms

Opis:

The soils consist of various components that can play a significant role in control of heavy metals in the environment. Therefore, understanding of adsorption properties of soil is essential in solving pollution problems around mine sites. The goal of this paper is to study Zn(II) ions adsorption onto copper mine soil. Soils were examined via X-ray diffraction and scanning electron microscopy. The influence of various parameters such as effect of pH, adsorbent dose, and initial concentration of Zn(II) ions on adsorption was evaluated by batch method. The adsorption isotherms of Zn(II) ions such as Langmuir, Freundlich, and Temkin were studied. The Langmuir isotherm indicated an excellent fit for the experimental data in comparison with other isotherms that shown monolayer adsorption onto a homogenous surface. A number of kinetic models were tested to fit the kinetic data. The results show that soils can be more effective in decreasing heavy metals contamination specially Zn(II) ions from solution phase.

Źródło:

Physicochemical Problems of Mineral Processing; 2016, 52, 2; 767-779
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Study of Interactions Between Individual Phenolics of Aronia with Barley Beta-Glucan

Autorzy:

Jakobek, Lidija
Matić, Petra
Ištuk, Jozo
Barron, Andrew R.

Powiązania:

https://bibliotekanauki.pl/articles/1363268.pdf

Data publikacji:

2021-05-11

Wydawca:

Instytut Rozrodu Zwierząt i Badań Żywności Polskiej Akademii Nauk w Olsztynie

Tematy:

adsorption isotherms
adsorption capacity
non-linear models
chokeberry
interactions

Opis:

Beneficial effects of aronia phenolics are determined by their interactions with dietary fibers, such as beta-glucan. The aim of this research was to study interactions between aronia phenolics and beta-glucan by investigating the adsorption process. Phenolic compounds were extracted from aronia, analyzed using high-performance liquid chromatography, and adsorbed onto beta-glucan at pH 1.5. The adsorption data were modeled by using Langmuir, Dubinin-Radushkevich, and Hill isotherms with a novel non-linear regression developed especially for adsorption isotherms. Aronia phenolics adsorbed onto beta-glucan in amounts 31-250 mg/g (individual anthocyanins), 44-123 mg/g (individual flavonols), and 51 mg/g (neochlorogenic acid). The correlation between adsorption capacities and phenolic content was high (r2=0.94), which suggested that the adsorption might be concentration dependent. Modeling with a novel non-linear regression allowed more precise determination of adsorption isotherm parameters. Furthermore, there was a correlation between maximum adsorption capacities predicted by models and measured adsorption capacities (r2 0.76, 0.81, and 0.34 for Langmuir, Dubinin-Radushevich, Hill isotherms, respectively). The suggested bonds involved in interactions are non-covalent bonds (H bonds, Van der Waals forces). Principal component analysis showed that anthocyanins, flavonols, and phenolic acids could differently behave in the adsorption process, which could be due to differences in the chemical structures (ionic nature of anthocyanins, nonionic nature of flavonols and phenolic acids at low pH). In conclusion, aronia phenolics interacted with beta-glucan by adsorbing onto its surface, and the novel modeling developed by our team was helpful in the interpretation of this process. Interactions should be further studied due to their importance for the beneficial effects of aronia.

Źródło:

Polish Journal of Food and Nutrition Sciences; 2021, 71, 2; 187-196
1230-0322
2083-6007

Pojawia się w:

Polish Journal of Food and Nutrition Sciences

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Methods of Dyes Removal from Aqueous Environment

Autorzy:

Bożęcka, Agnieszka
Orlof-Naturalna, Monika
Kopeć, Monika

Powiązania:

https://bibliotekanauki.pl/articles/1955552.pdf

Data publikacji:

2021

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

dye
adsorption
wastewater

Opis:

In this paper, selected methods of dyes removal from water environment were discussed, with particular attention to the adsorption method. A literature review of the latest scientific research on colour impurities removal with the use of various types of adsorbents was presented. The efficiency of the methylene blue removal process, with use of selected natural sorbents and activated carbons, was tested. The competitiveness of natural sorbents was shown. It was confirmed that these materials are efficient in removing coloured compounds from aqueous solutions.

Źródło:

Journal of Ecological Engineering; 2021, 22, 9; 111-118
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Atorvastatin adsorption studies on chitosans in an in vitro pharmaceutical model

Autorzy:

Meler, Jan
Grimling, Bożena
Szcześniak, Maria
Karolewicz, Bożena
Biernat, Paweł

Powiązania:

https://bibliotekanauki.pl/articles/1034415.pdf

Data publikacji:

2018

Wydawca:

Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe

Tematy:

Atorvastatin
adsorption
chitosan

Opis:

During the pharmacological therapy of specific diseases, drugs are used which, with other preparations or foods, can create connections, in many cases changing or even blocking their action. On the other hand, the use of unsuitable polymers as excipients may result in drug-polymer incompatibilities. Interactions consisting mainly of the occurrence of the adsorption phenomenon and on the formation of complex bonds that reduce the effect of the drugs are of particular importance. The aim of the study was to investigate whether the active substance atorvastatin is incompatible with dietary supplements containing chitosan. The phenomenon of the adsorption of the drug was examined using a static model of a pharmaceutical gastrointestinal tract, in the concentration range generally ingested in a single dose. Measurement results of the amount of bound drug were used to determine the average percentage of adsorbed drug dose. The results of the study prove that the anticholinesterase drug is adsorbed on chitosan in the pH ranges used, and that the binding capacity depends on the chitosan variety, which indirectly affects the reaction of the environment. It was observed that the average size of sorption depending on the chitosan variety ranged from 38% to 86%. The fact that the lowest value of adsorption was at pH 6.4 can be explained by the chemical properties of chitosan, which shows a charge only at pH >6.7. Under such conditions, the phenomenon of electrostatic adsorption may occur in relation to the healing substances of weak acids. At a pH above 7.6, corresponding to the intestinal fluid-filled intestine, the mean sorption for the highest dose of chitosan was from 38–86%. The increase in the adsorbed amount of anticholinesterase drugs on the polymer along with the increase in pH from 7.6 to 8.0 can be explained by the chitosan swelling properties, which increase with an increase in the pH. As a result, the specific surface area of the polymer and its sorption capacity increase. Based on the above considerations, it can be concluded that there is an antagonistic interaction between the drug and the polymer studied, which involves the adsorption of a drug from this group on the polymer (chitosan) and a decrease in its bioavailability

Źródło:

Progress on Chemistry and Application of Chitin and its Derivatives; 2018, 23; 140-148
1896-5644

Pojawia się w:

Progress on Chemistry and Application of Chitin and its Derivatives

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

The adsorption of simvastatin on chitosans in an in vitro pharmaceutical model

Autorzy:

Meler, Jan
Grimling, Bożena
Szcześniak, Maria
Pluta, Janusz
Biernat, Paweł

Powiązania:

https://bibliotekanauki.pl/articles/1034541.pdf

Data publikacji:

2017

Wydawca:

Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe

Tematy:

adsorption
chitosan
simvastatin

Opis:

In clinical practice for the treatment of obesity, several natural macromolecular compounds are used, whose operation is based on supporting weight loss. During the use of dietary supplements containing chitosan, disease sometimes occurs and treatment for this often comprises different therapeutic agents and antibiotics. The aim of our study was to determine the binding capacity of simvastatin to chitosan, which is found in dietary supplements promoting weight loss, depending on variable physicochemical factors in the gastrointestinal tract model. The phenomenon of adsorption of simvastatin was investigated by a static and dynamic pharmaceutical model (according to the Modified method of Polish Pharmacopoeia IX) simulating the conditions in vitro. The amount of bound drug is used to calculate the average percentage of the adsorbed dose. The obtained results showed that simvastatin is adsorbed by chitosan in the used pH ranges, and the binding capacity is dependent on the environmental pH, viscosity, the concentration of the drug, the type of chitosan and additional substances present in the gastrointestinal tract. The average adsorption of simvastatin in the system of chitosan-nutrients, depending on the pH of the medium, was in the range of 27 to 95%. The highest amount of adsorption was noted above pH 7 (chitosan precipitated polymer forming the emulsion-gel system), when the bioavailability of dietary supplement using chitosan was almost zero.

Źródło:

Progress on Chemistry and Application of Chitin and its Derivatives; 2017, 22; 151-158
1896-5644

Pojawia się w:

Progress on Chemistry and Application of Chitin and its Derivatives

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

In vitro studies of adsorption of erythromycin on chitosans from dietary supplements

Autorzy:

Meler, Jan
Grimling, Bożena
Szcześniak, Maria
Biernat, Paweł

Powiązania:

https://bibliotekanauki.pl/articles/1035189.pdf

Data publikacji:

2014

Wydawca:

Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe

Tematy:

Erythromycin
adsorption
chitosan

Opis:

In clinical practice, in the treatment of obesity, a plurality of natural high-molecular compounds are used, the activity of which supports weight loss. During the use of dietary supplements containing chitosan, illness sometimes develops and other therapeutic agents are applied as antibiotics The aim of our study was to determine the binding capacity of the antibiotic erythromycin depending on variable physicochemical factors, in the model of the gastrointestinal tract, by chitosans found in slimming dietary supplements Erythromycin adsorption phenomenon was studied by static and dynamic pharmaceutical model (according to the modified method of the Polish Pharmacopoeia) simulating in vitro conditions. The amount of bound drug was used to calculate the average percentage of the adsorbed dose. The results obtained show that erythromycin is adsorbed by chitosans at various pH ranges, and the binding capacity of the environment depends on the pH, viscosity and concentration of the antibiotic, as well as the chitosan and type and additional substances present in the gastrointestinal tract. The average level of the adsorption of erythromycin in the chitosan-nutrients system depends on the pH of the medium. The highest amount of adsorption was noted above pH 7 (chitosan precipitated polymer forming the emulsion-gel system).

Źródło:

Progress on Chemistry and Application of Chitin and its Derivatives; 2014, 19; 119-123
1896-5644

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Progress on Chemistry and Application of Chitin and its Derivatives

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

Synthesis, Characterization and Cr(VI) Adsorption Properties of Modified Magnetite Nanoparticles

Autorzy:

Çıftçı, H.
Ersoy, B.
Evcın, A.

Powiązania:

https://bibliotekanauki.pl/articles/1031143.pdf

Data publikacji:

2017-09

Wydawca:

Polska Akademia Nauk. Instytut Fizyki PAN

Tematy:

nanomagnetite
adsorption
Cr(VI)
Langmuir
Freundlich
adsorption kinetics

Opis:

In this study, magnetite (Fe₃O₄) nanoparticles were synthesized by chemical co-precipitation method, coated with silica, and then the surface of silica coated magnetite (Fe₃O₄@SiO₂) nanoparticles was modified with (3-aminopropyl)triethoxysilane (APTES) at first. Secondly, attained nanoparticles were characterized by the Fourier transform infrared, X-ray diffraction, transmission electron microscopy, the Brunauer-Emmett-Teller, vibrating sample magnetometer, and zeta-sizer devices/methods. Finally, detailed adsorption experiments were performed to remove hexavalent chromium (Cr(VI)) from aqueous media by synthesized nanoparticles. Mean size and specific surface area of synthesized nanoparticles were about 15 nm and 89.5 m²/g, respectively. The highest adsorption capacity among used adsorbents (Fe₃O₄, Fe₃O₄@SiO₂, Fe₃O₄@SiO₂@L) was attained by Fe₃O₄ nanoparticles and it was determined that adsorption capacity of the other two adsorbents was too low when compared to the Fe₃O₄ nanoparticles. Optimum conditions for Cr(VI) adsorption by Fe₃O₄ nanoparticles were: pH, 3; temperature, 55°C; contact time, 90 min; adsorbent concentration, 0.5 g/l and initial Cr(VI) concentration 10 mg/l. Under these conditions, adsorption capacity and removal percentage of Cr(VI) were found to be 33.45 mg/g and 88%, respectively.

Źródło:

Acta Physica Polonica A; 2017, 132, 3; 564-569
0587-4246
1898-794X

Pojawia się w:

Acta Physica Polonica A

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Analiza uproszczonych równań dynamiki adsorpcji
Analysis of simplified equations of adsorption dynamics

Autorzy:

Piekarski, J.
Dąbrowski, T.

Powiązania:

https://bibliotekanauki.pl/articles/400993.pdf

Data publikacji:

2011

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

adsorpcja
uproszczone równania adsorpcji
adsorption
simplified adsorption equations

Opis:

W zależności od układu, w jakim realizowany jest proces adsorpcji, do jego matematycznego opisu można zastosować równania kinetyki, statyki oraz dynamiki adsorpcji. Najbardziej ogólnym modelem do opisu przebiegu procesu adsorpcji w układzie porcjowym jest model oparty o równanie pola stężeń adsorbatu w wewnętrznej strukturze absorbentu. Dynamika adsorpcji rozpatruje czasowo-przestrzenny rozkład adsorbatu w złożu adsorpcyjnym. W niniejszej publikacji przedstawiono analizę oraz praktyczne wykorzystanie wybranych równań dynamiki procesu adsorpcji do obliczania czasu pracy złoża sorbentu w układzie przepływowym.
Depending on the system, in which the adsorption process is implemented, equations of kinetics, statics and dynamics of adsorption can be applied for its mathematical description. The most general model used for description of adsorption process in the batch system is a model based on field equation of adsorbate concentration in the internal structure of the absorbent. Dynamics of adsorption examines the time-spatial distribution of adsorbate in the adsorbent bed. This publication presents analysis and practical use of selected dynamics equations of adsorption process for calculation of working time of sorbent deposits of in a flow system.

Źródło:

Inżynieria Ekologiczna; 2011, 24; 164-173
2081-139X
2392-0629

Pojawia się w:

Inżynieria Ekologiczna

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Removal of quinoline using various particle sizes anthracite: adsorption kinetics and adsorption isotherms

Autorzy:

Xu, Hongxiang
Sun, Xianfeng
Yu, Yuexian
Liu, Guowei
Ma, Liqiang
Huang, Gen

Powiązania:

https://bibliotekanauki.pl/articles/109567.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

adsorption isotherm
anthracite
particle size
quinoline adsorption kinetics

Opis:

This work provided an adsorption method of the removal of quinoline by using anthracite of various particle sizes. The characteristics of the adsorbents were analyzed by Camsizer XT for particle size analysis, FT-IR for functional groups, X-ray diffusion for mineralogical composition, Brunauer-Emmett-Teller for specific surface area and Barrett-Joyner-Halenda for pore size distribution. The average particle size of AC1-AC4 were 0.0342 mm, 0.1015 mm, 0.2103 mm and 0.3815 mm, respectively. The specific surface of the AC1-AC4 were 3.5 m2·g-1, 1.5 m2·g-1, 0.7 m2·g-1 and 0.1 m2·g-1 respectively. The adsorption capacity present a linear increase with the specific surface area increasing. To reveal the process of the adsorption, the adsorption kinetics and isotherms were performed. The kinetics data were analyzed by pseudo-first-order, pseudo-second-order and intra-particle diffusion equation using linearized correlation coefficient. Pseudo-second-order was found to best represent the kinetics data, which indicated that the adsorption of quinoline onto anthracite belongs to chemisorption. The equilibrium isotherms data were analyzed by Langmuir model and Freundlich model, the results indicated that the Freundlich model fit well for all the adsorption processes, which showed that the adsorption of quinoline onto anthracite belongs to endothermic reaction.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 1; 196-207
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Adsorption behavior and XPS analysis of nonylphenol ethoxylate on low rank coal

Autorzy:

You, Xiaofang
Ma, Chuandong
Li, Zhihao
Lyu, Xianjun
Li, Lin

Powiązania:

https://bibliotekanauki.pl/articles/109627.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

low rank coal
nonylphenol ethoxylate
adsorption isotherm
adsorption kinetics
XPS

Opis:

In this work, low rank coal was used for the removal of nonylphenol ethoxylate with fifteen ethylene oxide groups (NPEO15) from aqueous solutions at different contact times, temperatures, and initial adsorbent concentrations. The adsorption isotherms showed good fit with the Langmuir equation. Maximum adsorption capacities calculated at 308, 318, and 328 K were 23.64, 29.41, and 35.71 mg g–1, respectively. The changes in the free energy of adsorption (ΔG°), enthalpy (ΔH°), and entropy (ΔS°) were calculated in order to predict the nature of adsorption. The results of the thermodynamic analysis indicated that a spontaneous process took place, driven synergistically by both enthalpy and entropy. The adsorption kinetics of NPEO15 were consistent with a pseudo-second order reaction model. XPS results showed that the oxygen functional groups on the low rank coal surface were significantly covered by NPEO15. Furthermore, while the content of C–C/C–H functional groups increased significantly, that of C–O functional groups decreased after absorption. These results clearly indicate that low rank coal is more hydrophobic and displays better floatability.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 3; 721-731
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

Studies of gentamycin adsorption on chitosan

Autorzy:

Meler, Jan
Grimling, Bożena
Pluta, Janusz

Powiązania:

https://bibliotekanauki.pl/articles/1035211.pdf

Data publikacji:

2013

Wydawca:

Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe

Tematy:

Gentamycin
adsorption
chitosan

Opis:

Chitosan as a dietary supplement has been used in the treatment of obesity due to its capability of binding bioactive compounds. A molecule of a cationic polymer, such as chitosan, may bind gentamycin. The aim of the study was to determine the binding capability of Gentamycin by chitosan’s contained in weight-loss supplements. The Gentamycin absorption was investigated by means of a dynamic method in a biopharmaceutical model imitating in vitro conditions including the required level of nutrients. Mean absorption of gentamycin by chitosan ranged from 2,1% to 34,1% depending on the environmental pH. The highest absorption rate was observed at above pH 6,8. Concluding, the studies confirmed that the investigated gentamycin interact with chitosan, what leads to decrease in their amount and affects the bioavailability of the drugs.

Źródło:

Progress on Chemistry and Application of Chitin and its Derivatives; 2013, 18, 18; 175-179
1896-5644

Pojawia się w:

Progress on Chemistry and Application of Chitin and its Derivatives

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Studies on adsorption chloramfenicol on chitosans in pharmaceutical “in vitro” model

Autorzy:

Meler, Jan
Grimling, Bożena
Biernat, Paweł
Pluta, Janusz

Powiązania:

https://bibliotekanauki.pl/articles/1035338.pdf

Data publikacji:

2013

Wydawca:

Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe

Tematy:

Chloramphenicol
adsorption
chitosan

Opis:

In clinical practice in the treatment of obesity, uses several natural macromolecular compounds, whose functioning is based on supporting the weight loss. In use of dietary supplements containing chitosan, sometimes reaches the illness and in the treatment, which the other therapeutic agents are chemotherapeutic drugs. The aim of our study was to determine the binding capacity of chloramphenicol chemotherapeutic depending on variable factors physico-chemical properties, present in the intestinal tract model of chitosans present in the drugs. The phenomenon of adsorption of chloramphenicol was examined by a dynamic model simulating the conditions of the pharmaceutical in vitro. the amount of adsorbed chemotherapy. The obtained results show that chloramphenicol is adsorbed by chitosans at pH ranges used, and the binding capacity depends on the pH of the environment and the viscosity and concentration of the chemotherapeutic agent as well as the type of chitosan and the additional substances present in the gastrointestinal tract. The average size of the adsorption system chemotherapeutic chitosan-nutrients depending on the pH of the medium ranged from 22.3 to 100.0%. Maximum number of adsorption points above pH 7 (chitosan precipitated polymer forming the emulsion-gel system).

Źródło:

Progress on Chemistry and Application of Chitin and its Derivatives; 2013, 18, 18; 187-191
1896-5644

Pojawia się w:

Progress on Chemistry and Application of Chitin and its Derivatives

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

Studies of norfloxacin adsorption on chitosan

Autorzy:

Meler, Jan
Grimling, Bożena
Pluta, Janusz

Powiązania:

https://bibliotekanauki.pl/articles/1035394.pdf

Data publikacji:

2012

Wydawca:

Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe

Tematy:

adsorption
chitosan
norfloxacin

Opis:

In clinical practice a lot of natural macromolecular compounds which operation is based on assisting weight loss are used in the obesity treatment. These measures swell in the digestive tract and form the polymer gel system, which has the ability to adsorb up to 5 times more lipids relative to its own weight. When using dietary supplements containing chitosan, sometimes it comes to illness and in the therapy other agents such as chemotherapeutics are used. The aim of our study was to determine the binding capacity of chemotherapeutic norfloxacin present in the digestive tract model by chitosans found in slimming medicines, depending on variable physico-chemical factors. Phenomenon of norrfloxacin adsorption was studied by a dynamic pharmaceutical model simulating in vitro conditions. The amount of adsorbed chemotherapeutic agent by chitosan was calculated by the difference in concentrations of study drug before and after sorption. The results of measurements of quantities bounded norfloxacin were used to calculate the average percentage of adsorbed dose. The results show that norfloxacin is adsorbed by the chitosans in the applicable pH ranges, and the binding capacity depends on the pH, viscosity and concentration of chemotherapeutics, as well as the type of chitosan and additional substances in the gastrointestinal tract. The average amount of chemotherapeutic adsorption in the system chitosan-nutrients, depending on the pH ranged from 80 to 98%. The highest number of adsorption points above pH 7. In conclusion, the addition of dietary supplement such as chitosan reduces the amount of administered uniformly chemotherapeutic and simultaneously has a large impact on the bioavailability. The observed dependence may require changes in therapeutic process.

Źródło:

Progress on Chemistry and Application of Chitin and its Derivatives; 2012, 17; 103-110
1896-5644

Pojawia się w:

Progress on Chemistry and Application of Chitin and its Derivatives

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Fuzzy logic approach in the analysis of heat transfer in a porous sorbent bed of the adsorption chiller

Autorzy:

Grabowska, K.
Krzywański, J.
Sztekler, K.
Kalawa, W.
Nowak, W.

Powiązania:

https://bibliotekanauki.pl/articles/297943.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Warmińsko-Mazurski w Olsztynie

Tematy:

adsorption chiller
porous media
fuzzy logic
thermal conductivity
coated adsorption bed

Opis:

Thermal conductivity in the boundary layer of heat exchange surface is the crucial parameter of adsorption process efficiency which occurs in the adsorption bed. In order to improve heat transfer conditions in the adsorption chiller, novel constructions of adsorption beds are currently investigated. The porous structure of the sorbent layer causes low thermal conductivity in the adsorption bed. One of the methods to improve heat transfer conditions is a modification of porous media bed structure with glue which is characterized with higher thermal conductivity. The optimum parameters of sorbents and glues to build the novel coated construction, in terms of improving the chiller Coefficient of Performance (COP) were defined in (Grabowska et al. 2018a). The paper implements fuzzy logic approach for predicting thermal conductivity of modified porous media layers. The developed model allows determination of the sorbent layer thermal conductivity based on various input parameters: arithmetic average of particle distribution d, density ρ and thermal diffusivity k. The data from empirical research was used to build up the model by fuzzy logic methods.

Źródło:

Technical Sciences / University of Warmia and Mazury in Olsztyn; 2018, 21(4); 281-290
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: 25.

Tytuł:

The influence of alkali concentration and temperature on chemical activation of halloysite

Autorzy:

Maziarz, P.

Powiązania:

https://bibliotekanauki.pl/articles/184280.pdf

Data publikacji:

2016

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

clay mineral
adsorption
structure

Opis:

The influence of alkali activation on clay minerals is not thoroughly investigated, particularly in terms of its impact on adsorption possibilities of clay minerals. One of the studied applications of base treated clay minerals was to control sustained drug release (Wang et al. 2013). Based on the recent studies, the base treatment can cause changes in structure, texture, and morphology of clay minerals. These changes are related to partial dissolution of layered structure and subsequent release of Si and Al to the solution (White et al. 2012, Yuan et al. 2015). This modification can be especially promising in case of halloysite, which is a clay mineral revealing unique nanoscale tubular morphology. Previous studies indicate that selective dissolution of halloysite’s aluminosilicate layers can lead to opening of the tubes interior (lumen) (Wang et al. 2013). This type of structural alteration can influence utilization possibilities of halloysite. Therefore, the aim of this work is to investigate the influence of alkali concentration and reaction temperature on the halloysite structure. The halloysite used in the studies came from Polish deposit located in Dunino, near Legnica (SW Poland) which is constantly exploited. The base activation was carried out using sodium hydroxide (NaOH). Firstly, the effect of NaOH concentration on activation efficiency was investigated. The experiments were carried out for the concentration range from 0.01 to 5.0 mol/L at room temperature. Additionally, for the 1.0 mol/L concentration the experiments were performed at temperatures of 50°C, 60°C, 70°C, 80°C and 90°C. the suspensions consisting of 2 g of halloysite and 50 mL of appropriate solution were mixed for 24 h using magnetic stirrer. Subsequently, the samples were washed with water and dried at 60°C. The prepared materials were characterized using XRD and FTIR methods. The IR results revealed that the concentrations of NaOH below 5 mol/L at room temperature did not cause significant changes in spectra of the tested samples. However, the results of experiments carried out in the temperature range from 60°C to 90°C showed that the temperature of the suspension can significantly affect the alkali activation. Based on the IR spectra the reaction at 50°C did not alter the structure of halloysite, in contrast to 60°C, 70°C, 80°C and 90°C temperatures. The changes of relative intensities of the bands associated with inner surface hydroxyls were observed in the 3700–3600 cm −1 region. These results suggest a gradual removal of inner surface hydroxyls, with the temperature increase. The results also indicated a gradual increase of intensity and broadening of the band with the maximum at 3430 cm −1 and 1647 cm −1 which were attributed to H–O–H stretching and bending vibrations of adsorbed water, respectively. It can be also observed that base treatment at higher temperature also caused structural changes within the aluminosilicate framework of halloysite. The frequency shift and broadening of bands assigned to Si-O-Si stretching (1033 cm −1 , 1008 cm −1 ) and bending (54 0 cm −1 ) vibrations were observed. The perturbations and/or removal of Al-O-H was confirmed by the decrease of bands intensity assigned to bending vibrations at 936 cm −1 and 914 cm −1 The higher temperatures resulted in an appearance of new bands at 1470 cm −1 and 1400 cm −1 associated with carbonates. These bands become more evident with the increase in temperature. The XRD results indicated the formation of additional crystalline phases: sodium aluminum silicate, hydrated sodium carbonates and sodium aluminum carbonate silicate. The presence of carbonates in the samples was confirmed also by FTIR spectra. It was suspected that the presence of carbonate may be related to uptake of atmospheric CO 2 and its reaction with NaOH in accordance with earlier reports by Slaty et al. (2013) and Aldabsheh et al. (2015). The results of this work suggest that different variations of the activation conditions should be examined, to find the optimal temperature for alkaline treatment that leads to an increase in the lumen diameter of halloysite, but does not affect the mineral morphology.

Źródło:

Geology, Geophysics and Environment; 2016, 42, 1; 97-98
2299-8004
2353-0790

Pojawia się w:

Geology, Geophysics and Environment

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 26.

Tytuł:

Application of adsorption isotherms in evaluating the influence of humic acid and farmyard manure on phosphorous adsorption and desorption capacity of calcareous soil

Autorzy:

Jamal, Aftab
Muhammad, Dost
ur Rahman, Mujeeb
Jamal, Hifsa

Powiązania:

https://bibliotekanauki.pl/articles/1165501.pdf

Data publikacji:

2018

Wydawca:

Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN

Tematy:

Adsorption
Humic acid
Isotherm

Opis:

The phosphorus adsorption capacity of soil in the presence and absence of HA and FYM was determined by adding 0, 10, 20, 40, 60, 120, 240 and 360 mg L-1 (initially applied P, IPA) to 5 g soils with and without HA (10 mg kg-1) and FYM (20 g kg-1). The soils along with respective phosphorus solution were taken in duplicates, were shaken on horizontal shaker for 30 hr continuously. The suspension were then filtered through whattman-42 and analyzed for P which represented the equilibrium P concentration (EPC). These soils were then applied another 45 mL distilled water and shaken for 24 hr for desorption study. The study revealed that the soils treated with P+FYM and P+HA significantly decreased the adsorption of Phosphorous at each level of IPA as compared with soil treated with P alone. Furthermore in case of alone P the higher Xad and Kd values attributed towards more P adsorption, at any levels of IPA than the soil which received HA and FYM treatments. Soils treated with P+FYM and P+HA indicated higher desorption of P as well at any IPA than the soil treated with P alone, confirmed that FYM and HA not only reduced P adsorption but also played a vital role in the release of P from soil surfaces into soil solution. Langmuir and Freundlich isotherms models were used in the study, however Freundlich model was found best fit in the present study. Such type of studies should be encouraged at field levels.

Źródło:

World Scientific News; 2018, 107; 136-149
2392-2192

Pojawia się w:

World Scientific News

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 27.

Tytuł:

Wastewater Purification from Excess Phosphates Using Bentonite Activated by Microwave Radiation

Autorzy:

Boichuk, Bohdan
Kuzyk, Andrew
Sysa, Leonid
Pastukhov, Paul
Shuplat, Taras

Powiązania:

https://bibliotekanauki.pl/articles/2086429.pdf

Data publikacji:

2022

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

phosphates
adsorption
bentonite
microwaves

Opis:

This article examines the possibilities of improving the ecological condition of small rivers on the example of the upper part of the Prut River in the vicinity of Yaremche (Ivano-Frankivsk region, Ukraine). The previously published data of the article authors and other researchers that the amount of pollutants in river water in this area has increased, in particular, phosphorus compounds, has been confirmed. It was shown that the incompletely purified wastewaters of Yaremche, which contains an excess of phosphate ions, has a significant impact on this fact. On the basis of their own previous research and current work, the authors propose removing these ions using a natural sorbent based on bentonite, activated by microwaves in various ways. Experiments have shown that microwave activation of this sorbent increases the coefficient of phosphate ions extraction from wastewater significantly higher compared to natural bentonite. An approximate technological scheme of wastewater purification from excess phosphates after the main standard purifying cycle was suggested.

Źródło:

Journal of Ecological Engineering; 2022, 23, 5; 251--259
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Adsorption of Phenol from Water on Natural Minerals

Autorzy:

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

Powiązania:

https://bibliotekanauki.pl/articles/123900.pdf

Data publikacji:

2018

Wydawca:

Polskie Towarzystwo Inżynierii Ekologicznej

Tematy:

phenol
adsorption
attapulgite
alganite

Opis:

Phenol and its derivatives (chlorophenol, nitrophenol, methylphenol, cresol etc.) belong to highly toxic contaminants, and their occurrence in industrial and municipal sewage as well as in groundwater carries a high threat to the environment and human health. Elimination of such contaminants is one of the major challenges in solving the global environmental problems. Implementation of pro-ecological methods of water treatment is associated with the use of natural, cheap and unprocessed materials, with the possibility of their repeated use. The article presents the results of the studies on the use of powdery adsorbents for the removal of phenol from aqueous solutions. The following natural minerals were used: attapulgite – Abso'net Superior Special (ASS) and alganite – Abso'net Multisorb (AM). Tests were performed under non-flowing conditions, in series, depending on the type and dose of adsorbents. Tests were conducted on a model solution of phenol with the initial concentration of C₀ = 20 mg /dm³, at the temp. of 20° C. Alganite mineral (AM) proved to be effective in adsorption of phenol. Maximum adsorption capacity P = 0.21 g/g, was obtained for a dose 10 mg/dm³. Almost complete removal of phenol (99.9%) was obtained for a dose of 500 mg/dm³. For natural attapulgite – Abso'net Superior Special (ASS) the maximum adsorption capacity (at a dose 5 mg/dm³) amounted to P = 0.15 g/g. The efficiency of phenol removal at the level 99% was obtained at a dose of 1000 mg/dm³).

Źródło:

Journal of Ecological Engineering; 2018, 19, 6; 132-138
2299-8993

Pojawia się w:

Journal of Ecological Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Adsorption Behavior of Glucuronic Acid on Pyrite Surface: an electrochemical and DFT Study

Autorzy:

Ning, Xu Jia
Ying, Yang Hong
Lin, Tong-Lin

Powiązania:

https://bibliotekanauki.pl/articles/355049.pdf

Data publikacji:

2020

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

glucuronic acid
pyrite
adsorption

Opis:

Bacterial adsorption on mineral surface is one of the key steps in bioleaching process. The bacteria adsorb on the mineral surface via the extracellular polymeric substances (EPS) layer. In this paper, the behavior of glucuronic acid, one of the key substances in EPS layer, adsorbed on the pyrite surface is studied using DFT and electrochemical methods. Adsorption capacity of glucuronic acid is stronger than that of water. Glucuronic acid adsorbs on pyrite surfaces and it follows a mixed type of interactions (physisorption and chemisorption). Adsorption of glucuronic acid on pyrite surface followed Langmuir’s adsorption isotherm with adsorption standard free energy of –27.67kJ mol^-1. The structural and electronic parameters were calculated and discussed.

Źródło:

Archives of Metallurgy and Materials; 2020, 65, 1; 433-440
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Removal of methylene blue by natural and Ca and K-exchanged zeolite treated with hydrogen peroxide

Autorzy:

Canli, M.
Abali, Y.
Bayca, S. U.

Powiązania:

https://bibliotekanauki.pl/articles/109770.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

dye adsorption
methylene blue
adsorption
isotherms
zeolite
aluminosilicate
hydrogen peroxide

Opis:

A comparison was made of influence of physically adsorbed methylene blue (MB) dye on the physicochemical properties of Manisa-Akdere zeolite (natural zeolite) and zeolite modified with K and Ca (all samples treated with hydrogen peroxide before modification) using batch adsorption technique. After elementary characterization of this adsorbent, the effects were investigated of initial MB concentration, pH, contact time, stirring rate, adsorbent dosage and temperature on the selectivity and sensitivity of the removal process. A larger adsorption of the dye was observed for modified zeolite (42.7 mg/g) than for natural zeolite (28.6 mg/g) per gram of an adsorbent after all zeolite samples treated with hydrogen peroxide. Zeolite treated with H2O2 showed higher adsorption capacity than untreated zeolite samples. The Langmuir model (R2 values between 0.959 and 0.996) fitted the experimental data better than the Freundlich model (R2 values between 0.804 and 0.988). The adsorption process was found to be slightly influenced by adsorbent dosage, contact time and temperature. Optimum pH for adsorption of MB was found to be at 7. Adsorption equilibrium attained within 30 minutes. The sorption of MB increased slightly with rising temperature. In addition, adsorption values rose with modification Ca-Exchanged (after H2O2 treatment) > K-Exchanged (after H2O2 treatment) > Zeolite treated with H2O2 > Ca-Exchanged >K-Exchanged >Natural Zeolite.

Źródło:

Physicochemical Problems of Mineral Processing; 2013, 49, 2; 481-496
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Adsorption of methylamine cations on kaolinite basal surfaces : A DFT study

Autorzy:

Chen, Jun
Min, Fan-fei
Liu, Ling-yun
Jia, Fei-fei

Powiązania:

https://bibliotekanauki.pl/articles/949692.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

kaolinite
methylamine cations
density functional theory
competitive adsorption
adsorption mechanism

Opis:

To explore the interaction of alkylamine surfactants with kaolinite, the density functional theory (DFT) method was used to calculate the single adsorption of different methylamine cation on kaolinite basal surfaces and the competitive adsorption of methylamine cation and water molecule on kaolinite basal surfaces, respectively. Different methylamine cations can adsorb on kaolinite basal surfaces by electrostatic interaction and hydrogen bonds, and the methylamine cations more easily adsorbed on kaolinite Si-O surface. In the case of competitive adsorption with water molecule, the methylamine cation is capable of flushing out the surrounding water molecule to get rid of its steric effect and stably adsorbing on kaolinite basal surfaces, and the adsorption state of the competitive adsorption system is more stable. The adsorption mechanism of methylamine cation on kaolinite basal surface should be the result of electrostatic interaction and hydrogen bonds, and the electrostatic interaction plays the main role.

Źródło:

Physicochemical Problems of Mineral Processing; 2020, 56, 2; 338-349
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Adsorption of CO2 by surface modified coal-based activated carbons: kinetic and thermodynamic analysis

Autorzy:

Xinzhe, Liu
Mingyang, Zhang
Juan, Chen
Zhengyu, Hu
Shuaifei, Xian
Mingxuan, Tang
Chenchen, Zhang

Powiązania:

https://bibliotekanauki.pl/articles/2174813.pdf

Data publikacji:

2022

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

Surface modification
CO2 adsorption capacity
adsorption kinetics
thermodynamic parameters

Opis:

The effects of different surface modifiers on the CO2 adsorption capacity of coal-based activated carbons were studied, and the diffusion behavior, adsorption kinetics and thermodynamic parameters of CO2 in activated car-bons were analyzed. The results show that compared with ethylene glycol, 1,2-propylenediamine and zinc chloride, potassium hydroxide and sodium hydroxide can greatly improve CO2 adsorption capacity. The adsorption rate is faster, and the adsorption capacity is larger, with the maximum CO2 adsorption capacity being 33.54 mL/g. Fick’s law can well describe the diffusion behavior of CO2 in activated carbon. The addition of a surface modifier can increase the diffusion coefficient. The diffusion of CO2 in activated carbon falls into the category of crystal diffusion. The adsorption kinetics of CO2 before and after surface modification follow the Bangham equation. During the adsorption process, δ H < 0, δ G < 0, δ S < 0. Surface modification can reduce adsorption heat and promote adsorption, and the adsorption process is dominated by physisorption.

Źródło:

Polish Journal of Chemical Technology; 2022, 24, 3; 19--28
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Adsorpcja - fizykochemiczny fundament zjawisk powierzchniowych i międzyfazowych
Adsorption: the physicochemical basis of surface and interfacial phenomena

Autorzy:

Garbacz, Jerzy K.
Kozakiewicz, Mariusz
Kopkowska, Ewa

Powiązania:

https://bibliotekanauki.pl/articles/50427628.pdf

Data publikacji:

2023

Wydawca:

Włocławskie Towarzystwo Naukowe

Tematy:

adsorption system
monolayer
adsorption isotherm
układ adsorpcyjny
monowarstwa
izoterma adsorpcji

Opis:

Przedmiot artykułu stanowią wybrane aspekty adsorpcji, która jest jednym z najważniejszych zjawisk fizykochemicznych limitujących dynamikę wszelkich procesów zachodzących w układach wielofazowych. Podkreślając powszechność zjawiska, wskazano na przykłady jego praktycznego wykorzystania zarówno w skali mikro, jak i w różnych gałęziach przemysłu, a także w ochronie i inżynierii środowiska. Jako zasadniczy cel omówienia przyjęto teoretyczny opis równowagi adsorpcyjnej ograniczając, z konieczności, analizę do najprostszego przypadku, tj. do układu gaz/ciało stałe. Rozwój teorii zilustrowano, w pierwszej kolejności, przykładami modeli adsorpcji mono- i poliwarstwowej na powierzchniach homogenicznych, a następnie omówiono najważniejsze determinanty konstytuujące opis zjawiska z udziałem adsorbentów heterogenicznych pod względem rozkładu potencjału adsorpcyjnego. Wykaz literatury ograniczono do pozycji o charakterze kanonicznym.
The paper concerns selected aspects of adsorption, which is among the major physicochemical phenomena restricting the dynamics of any processes that occur in multiphase systems. The phenomenon is pointed out to be universal and examples are presented of how it can be put to practical use both in the micro scale and in various branches of industry, as well as environmental protection and environmental engineering. The principal object of the paper is to describe adsorption equilibrium in theoretical terms, perforce reducing the analysis to the simplest case, being the gas-solid system. The development of the theory is illustrated primarily with examples of mono- and multi-layer adsorption models on homogeneous surfaces, followed by a description of the major determinants by which the phenomenon is described, including adsorbents heterogenic in terms of adsorption potential distribution. The list of references is reduced to canonical texts.

Źródło:

Zapiski Kujawsko-Dobrzyńskie; 2023, 36; 89-128
1426-7136

Pojawia się w:

Zapiski Kujawsko-Dobrzyńskie

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Adsorption mechanism and modelling of hydrocarbon contaminants onto rice straw activated carbons

Autorzy:

Abdel daiem, Mahmoud M.
Sánchez-Polo, Manuel
Rashed, Ahmed S.
Kamal, Nehal
Said, Noha

Powiązania:

https://bibliotekanauki.pl/articles/779863.pdf

Data publikacji:

2019

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

activated carbon
rice straw
adsorption mechanism
adsorption modeling
pore volume surface diffusion

Opis:

The adsorption of Diphenolic acid (DPA), 2,4-Dichlorophenoxyacetic acid (2,4-D), and 2-methyl-4-chlorophenoxyacetic acid (MCPA) were examined in aqueous solution using activated carbon rice straw. The rice straw was activated by using two reagents, zinc chloride and phosphoric acid and named as RSZ, RSP, respectively. The results showed that both carbons have a relatively high adsorption capacity. Concerning the adsorption kinetic, the second-order model has better fit than the first model to experimental data. The adsorption yield of both carbons increased in the order: DPA < 2,4-D < MCPA. The pore volume diffusion model satisfactorily fitted the experiment on both carbons. Furthermore, solution pH has a high influence on the adsorption capacity for both carbons. The adsorption mechanism of selected pollutants onto carbon samples has been controlled by dispersion interaction π-π electrons and electrostatic interaction, moreover, the contribution of pore volume diffusion is the controlling mechanism of the overall rate of adsorption.

Źródło:

Polish Journal of Chemical Technology; 2019, 21, 4; 1-12
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Wpływ obecności wybranych SPC na adsorpcję jonów Cr(III) i Cr(VI)
The influence presence of selected spc for absorption Cr (III) and Cr (VI)

Autorzy:

Lach, J.

Powiązania:

https://bibliotekanauki.pl/articles/297450.pdf

Data publikacji:

2015

Wydawca:

Politechnika Częstochowska. Wydawnictwo Politechniki Częstochowskiej

Tematy:

chrom
substancje powierzchniowo czynne
adsorpcja
izotermy adsorpcji
chromium
surfactants
adsorption
adsorption isotherm

Opis:

Przeprowadzono adsorpcję kationów chromu trójwartościowego i anionów chromu sześciowartościowego na węglu ROW 08 Supra z roztworów jednoskładnikowych i dwuskładnikowych zawierających substancje powierzchniowo czynne (SPC). Przeanalizowano znaczenie obecności w roztworze kationowych, anionowych i niejonowych SPC (2 związki z każdej grupy na adsorpcję jonów Cr(III) i Cr(VI). Stwierdzono pozytywny wpływ substancji powierzchniowo czynnych w przypadku, gdy miały one przeciwny ładunek w stosunku do usuwanego jonu chromu (kationowe SPC podczas adsorpcji anionów Cr(VI), anionowe SPC podczas adsorpcji kationów Cr(III)). Jest to spowodowane najprawdopodobniej powstawaniem nowych centrów aktywnych na powierzchni węgli aktywnych w wyniku adsorpcji jonowych SPC. Obecność w roztworze niejonowych SPC oraz jonowych o takim samym znaku ładunku jak adsorbowane jony Cr(III) lub Cr(VI) powoduje zmniejszenie pojemności adsorpcyjnej węgla. Jest to spowodowane blokowaniem jonów oraz konkurencyjnością między jonami chromu a SPC. Do opisu wyników adsorpcji użyto modeli Langmuira, Freundlicha, Temkina i Dubinina-Radushkevicha. Wszystkie te izotermy opisują uzyskane rezultaty procesu z wysokimi wartościami współczynnika korelacji.
The present study reports the results of the adsorption of trivalent chromium cations and hexavalent chromium anions on ROW 08 Supra carbon from single solute and bisolute solutions containing surfactants. The roles of the cationic, anionic and non-ionic (2 compounds per group) surfactants’ presence in the solution were analysed with reference to the adsorption of Cr(III) and Cr(VI) ions. The positive impact of surfactants was observed in the cases when their charge was the opposite to the removed chromium ion (cationic surfactant during the adsorption of Cr(VI) anions, anionic surfactant during the adsorption of Cr(III) cations). Most probably it is the result of new active cents on the surface of active carbons caused by ionic surfactant adsorptions. The presence in the solution of non-ionic and ionic surfactants of the same charge as the adsorbed Cr(III) and Cr(VI) ions results in the decrease of carbon adsorption surface. It is caused by ion blocking and competition between the chromium ions and surfactants. The Langmuir, Freundlich, Temkin and Dubinin-Radushkevich models were used for the adsorption result descriptions. All the isotherms of high correlation coefficient values describe the obtained results of the process.

Źródło:

Inżynieria i Ochrona Środowiska; 2015, 18, 4; 537-547
1505-3695
2391-7253

Pojawia się w:

Inżynieria i Ochrona Środowiska

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Study of 2–thiocytosine/ surfactant adsorption at the R-AgLAFe/chlorate(VII) interface – impact of surfactant ionic character

Autorzy:

Martyna, Marlena
Grochowski, Mariusz
Urban, Teresa
Nosal-Wiercińska, Agnieszka

Powiązania:

https://bibliotekanauki.pl/articles/2146942.pdf

Data publikacji:

2022

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

mixed adsorption layers
2-thiocytosine
SDS
CTAB
adsorption parameters
R-AgLAFe electrode

Opis:

Effect of 2 – thiocytosine on the parameters of double R-AgLAFe/ chlorate(VII) interface layer in the presence of different surfactants has been studied. There were determined the adsorption parameters such as: differential capacity of the double layer (Cd) at the R-AgLAFe/ basic electrolyte interface; potential of zero charge (Ez) and surface tension at the potential of zero charge (γz). The predominance of 2–thiocytosine in formation of adsorption equilibria of 2–thiocytosine–SDS and 2– thiocytosine–CTAB mixtures as well as the competitive adsorption between molecules 2–thiocytosine-surfactant or mixed micelles was proved. The changes pointing out to different arrangement of SDS or CTAB molecules on the electrode surface also in the presence of 2–thiocytosine were observed.

Źródło:

Physicochemical Problems of Mineral Processing; 2022, 58, 2; art. no. 144322
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

First-principles study on the adsorption structure of water molecules on a pyrite (100) surface

Autorzy:

Liu, Yingchao
Chen, Jianhua
Li, Yuqiong
Zhang, Junjie
Kang, Duan

Powiązania:

https://bibliotekanauki.pl/articles/1447970.pdf

Data publikacji:

2021

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

pyrite
water molecules
adsorption

Opis:

The hydration structure of water molecule adsorption at different coverages of a monolayer on a pyrite (100) surface were simulated using the density functional theory (DFT) method. The results demonstrate that the Fe-O interaction weakens and the adsorption energy per water molecule decreases with increasing water coverage, except at a monolayer coverage of 12/12 (i.e., full coverage). H-S and H-O hydrogen bonds were formed on the nearest surface layer. When large amounts of water molecules adsorb onto the surface, the adsorbed water molecules can be divided into three layers: the layer nearest to the surface, the second nearest to the surface, and the layer farthest from the surface. The thickness of the former two layers is approximately 5.5 Å. The three layers have water densities of 1.12 g/cm3, 1.08 g/cm3, and 0.95 g/cm3, respectively, suggesting that there is a strong interaction between the pyrite surface and water molecules and the influence of surface structure on water adsorption reaches a distance of more than 10 Å. Dynamics simulations suggest that the water molecules close to the mineral surfaces are in an orderly arrangement while those far from the surface are disordered.

Źródło:

Physicochemical Problems of Mineral Processing; 2021, 57, 2; 121-130
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Phosphate removal from aqueous solutions by chitin and chitosan in flakes

Autorzy:

Szymczyk, Paula
Filipkowska, Urszula
Jóźwiak, Tomasz
Kuczajowska-Zadrożna, Małgorzata

Powiązania:

https://bibliotekanauki.pl/articles/1034690.pdf

Data publikacji:

2016

Wydawca:

Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe

Tematy:

adsorption
chitin
chitosan
phosphate

Opis:

The article presents the effectiveness of phosphate adsorption on the flakes of chitin and chitosan. Studies performed determined adsorption capacity of chitin and chitosan, best among the tested adsorption pH and the equilibrium time. Langmuir model was used to describe the results. The highest removal efficiency of phosphorus compounds using chitin was obtained at pH 3 and with chitosan at pH 4. The study of phosphate equilibrium concentration time obtained for both sorbents was carried out at three concentrations of 1, 5 and 10 mg/dm3. The highest sorption efficiency of the phosphate using chitin was achieved after 20 minutes of the process and at the chitosan after 40 minutes. In the case of chitosan after the equilibrium time the effect of partial P-PO4 release was observed, which could be related to the change in pH of the solution by the sorbent. Studies have shown that chitosan is a more effective absorbent for phosphorus compounds. The maximum adsorption capacity of chitosan with phosphate was 6.65 mg/g, and chitin - 2.09 mg/g.

Źródło:

Progress on Chemistry and Application of Chitin and its Derivatives; 2016, 21; 192-202
1896-5644

Pojawia się w:

Progress on Chemistry and Application of Chitin and its Derivatives

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Uptake of phenol from aqueous solution by burned water hyacinth

Autorzy:

Uddin, M.T.
Islam, M.S.
Islam, M.A.
Abedin, M.Z.

Powiązania:

https://bibliotekanauki.pl/articles/779654.pdf

Data publikacji:

2008

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

fenol
adsorpcja
równowaga
kinetyka adsorpcji
phenol
adsorption
burned water hyacinth
equilibrium
adsorption kinetics

Opis:

The potential of burned water hyacinth (BWH) for phenol adsorption from aqueous solution was studied. Batch kinetic and isotherm studies were carried out under varying experimental conditions of contact time, phenol concentration, adsorbent dosage and pH. The pH at the point of zero charge (pH(PZC)) of the adsorbent was determined by the titration method and the value of 8.8 š 0.2 was obtained. The FTIR of the adsorbent was carried out in order to find the potential adsorption sites for the interaction with phenol molecules. The Freundlich and Langmuir adsorption models were used for the mathematical description of adsorption equilibrium and it was found that the experimental data fitted very well to the Langmuir model. Maximum adsorption capacity of the adsorbent was found to be 30.49 mg/g. Batch adsorption models, based on the assumption of the pseudo-first-order and pseudo-second-order models, were applied to examine the kinetics of the adsorption. The results showed that kinetic data closely followed the pseudo-second-order model.

Źródło:

Polish Journal of Chemical Technology; 2008, 10, 2; 43-49
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Waste Plant Material as a Potential Adsorbent of a Selected Azo Dye

Autorzy:

Tomczak, E.
Tosik, P.

Powiązania:

https://bibliotekanauki.pl/articles/184994.pdf

Data publikacji:

2017

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

sunflower husk
Direct Orange 26
adsorption equilibrium
adsorption kinetics
adsorption dynamics
łuska słonecznika
równowaga adsorpcji
kinetyka adsorpcji
Dynamika adsorpcji

Opis:

This paper discusses the adsorption of Direct Orange 26 azo dye on sunflower husk - an agricultural waste product. During the study, sorption kinetics and equilibrium as well as sorption capacity of the husk were investigated. The adsorption kinetics was analyzed using pseudo-first and pseudo-second order equations, which indicated a chemical sorption mechanism. The sorption equilibrium was approximated with the two-parameter Freundlich and Langmuir equations and the three-parameter Redlich-Peterson equation. The main experiments were carried out in a laboratory adsorption column under different process conditions. Experimental data were interpreted with the Thomas model, based on the volumetric flow rate, initial composition of the feed solution and mass of the adsorbent. The results of modeling the adsorption equilibrium, adsorption kinetics and adsorption dynamics were evaluated statistically.

Źródło:

Chemical and Process Engineering; 2017, 38, 2; 283-294
0208-6425
2300-1925

Pojawia się w:

Chemical and Process Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Experimental study of a sorption cold storage supporting the air conditioning system

Autorzy:

Grzebielec, Andrzej
Szelągowski, Adam

Powiązania:

https://bibliotekanauki.pl/articles/132075.pdf

Data publikacji:

2019

Wydawca:

Centrum Rzeczoznawstwa Budowlanego Sp. z o.o.

Tematy:

adsorption
energy efficiency
cold storage

Opis:

Techniques related to elimination of environmental pollution are divided into two main trends. These are primary and secondary solutions. Primary solutions are based on the creation / selection of technologies that do not emit pollutants, secondary solutions are used in the situation that pollutants are already generated. Elimination is made by selected technological processes. When using residential, office or industrial buildings, emissions are primarily associated with the use of energy carriers such as electricity, heat or cold. During electricity production, pollution is related mostly to the atmosphere degradation. Thus, any solution that reduces energy consumption or improves the energy efficiency of buildings is the primary method of environment protection. This article proposes and investigates an idea of cold storage system based on an adsorbent bed (silica gel), which aims to reduce the energy consumption of the domestic air conditioning system. As a result of experimental research, it was shown that for a building with a volume of 1000m 3 and multiples of air exchanges at 0.5 level, a silica gel bed with a volume of 1.63 m3 is required in order to continuously unload the air conditioning system for 8 hours (while outside air temperature exceeding 25oC).

Źródło:

Modern Engineering; 2019, 1; 10-15
2450-5501

Pojawia się w:

Modern Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Removal of chromium and strontium from aqueous solutions by adsorption on laterite

Autorzy:

He, Yong
Chen, Yong-Gui
Zhang, Ke-Neng
Ye, Wei-Min
Wu, Dong-Yu

Powiązania:

https://bibliotekanauki.pl/articles/204768.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

adsorption
isotherms
chromium
strontium
laterite

Opis:

To investigate the adsorptive properties of a local laterite deposited in Chenzhou, Hunan province, China, the adsorptive properties of the natural laterite were investigated by batch technique in this study. The effects of contact time, pH, ionic strength, temperature, and the concentration on adsorption properties were also analyzed. The obtained experimental results show that the main mineral composition of laterite is kaolinite and montmorillonite. The adsorption process achieved equilibrium within 60 minutes and 90 minutes for Sr(II) and Cr(VI), respectively. The adsorption capacities for Cr(VI) and Sr(II) by the laterite were about 7.25 mg·g^-1 and 8.35 mg·g^-1 under the given experimental conditions, respectively. The equilibrium adsorption data were fitted to the second-order kinetic equation. The adsorption capacity for Sr(II) onto the laterite increased with increasing pH from 3–11 but decreased with increasing ionic strength from 0.001 to 1.0 M NaCl. The Sr(II) adsorption reaction on laterite was endothermic and the process of adsorption was favored at high temperature. Similarly, the adsorption capacity for Cr(VI) onto the laterite increased with increasing pH from 3–11, however, the ionic strength and temperature had an insignificant effect on Cr(VI) adsorption. The adsorption of Cr(VI) and Sr(II) was dominated by ion exchange and surface complexation in this work. Furthermore, the Langmuir and Freundlich adsorption isotherm model was used for the description of the adsorption process. The results suggest that the studied laterite samples can be effectively used for the treatment of contaminated wastewaters.

Źródło:

Archives of Environmental Protection; 2019, 45, 3; 11-20
2083-4772
2083-4810

Pojawia się w:

Archives of Environmental Protection

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Adsorption Kinetics of Reactive Dyes on Ash from Town Heating Plant

Autorzy:

Djordjevic, D.
Stojiljkovic, D.
Smelcerovic, M.

Powiązania:

https://bibliotekanauki.pl/articles/205104.pdf

Data publikacji:

2014

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

kinetics
reactive dye
adsorption
ashes

Opis:

In order to investigate the mechanism of adsorption of reactive dyes from the textile industry on ash from heating plant produced by brown coal combustion, some characteristic sorption constants are determined using Langergren adsorption equations for pseudo-first and pseudo-second order. Combined kinetic models of pseudo-first order and pseudo-second order can provide a simple but satisfactory explanation of the adsorption process for a reactive dye. According to the characteristic diagrams and results of adsorption kinetic parameters of reactive dyes on ashes, for the applied amounts of the adsorbents and different initial dye concentrations, it can be concluded that the rate of sorption is fully functionally described by second order adsorption model. According to the results, the rate constant of pseudo-second order decreases with increasing initial dye concentration and increases with increasing amount of adsorbent – ash.

Źródło:

Archives of Environmental Protection; 2014, 40, 3; 123-135
2083-4772
2083-4810

Pojawia się w:

Archives of Environmental Protection

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Investigation of adsorption behavior of phosphonium salts onto Na-montmorillonite

Autorzy:

Cinku, K.
Baysal, B.

Powiązania:

https://bibliotekanauki.pl/articles/110682.pdf

Data publikacji:

2014

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

Na-montmorillonite
phosphonium salts
adsorption

Opis:

Montmorillonite is an important clay mineral due to its cation exchange capacity and technological properties such as swelling and gelling. It has been widely used in many scientific applications like organoclay. Adsorption studies, involving montmorillonite in the presence of variety of organic compounds, like ammonium and phosphonium salts, are very important because of their application in organoclay and polymer nanocomposites. These materials have a high thermal resistivity. Different types of phosphonium salts, including hexadecyl triphenyl phosphonium bromide (HTPB), hexadecyl tributyl phosphonium bromide (HTBPB), and tetraphenyl phosphonium bromide (TPB), were used to investigate their adsorption on Na-montmorillonite. They have different structures and TPB contains only one aromatic part without any organic chain, HTBPB possess an organic chain with three branches while HTPB has an organic chain and an aromatic part. The adsorption of the surfactants was supplemented with other properties such as zeta potential, surface tension, and ability to flocculation. The results indicated that the adsorption behavior of these surfactants depended on their structure.

Źródło:

Physicochemical Problems of Mineral Processing; 2014, 50, 2; 417-432
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

Characteristics of cationic red x-grl adsorption by raw diatomite and diatomite concentrate

Autorzy:

Ren, Z.
Guan, J.
Gao, H.
Tian, J.
Wen, Y.
Zheng, R.

Powiązania:

https://bibliotekanauki.pl/articles/110723.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

diatomite
dye
adsorption
fine particles

Opis:

Raw diatomite (RD) and diatomite concentrate (DC) were used for the adsorption of cationic Red X-GRL from aqueous solutions. Mono-factor experiments were carried out to investigate the effects of the operation factor, and adsorption kinetics, isotherms, thermodynamics and mechanisms were explored. Similar trend for X-GRL adsorption onto RD and DC was observed. The adsorption capacity of dyes increased slightly with temperature, and the neutral pH was the optimum level. The adsorption processes occurred in accordance with the pseudo second-order model and were well fitted by the Langmuir isotherm model. The main driving forces of the physical adsorption on the diatomite were electrostatic attraction and van der Waals force. The RD could uptake more X-GRL than DC due to its higher content of fine particle and therefore, due to higher surface area available for adsorption. Raw diatomite as a cheap absorbent for X-GRL removal can be suggested as a promising supplement to activated carbon.

Źródło:

Physicochemical Problems of Mineral Processing; 2016, 52, 1; 44-55
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Biosorption of Cu2+ and Ni2+ ions from aqueous solutions using waste dried activated sludge biomass

Autorzy:

Aslan, S.
Yildiz, S.
Ozturk, M.

Powiązania:

https://bibliotekanauki.pl/articles/777992.pdf

Data publikacji:

2018

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

adsorption
copper
nickel
waste biomass

Opis:

Adsorption of Cu(II) and Ni(II) ions onto the waste powdered activated sludge biomass (PWB), which was obtained from the biological wastewater treatment plant, was investigated in this experimental study. The effects of contact time, pH, temperature, initial sorbate and sorbent concentrations on the adsorption were determined. The BET surface area, pore volume, and pore diameter of PWB were found to be about 0.51 m²/g, 0.0053 cm³/g, and 41.4 nm, respectively. Considering the R²  value, q_exp  and q_cal , the Langmuir and Freundlich models were well described for Cu(II) and Ni(II) adsorption, respectively. The adsorption mechanism of Cu(II) and Ni(II) onto the PWB could be better simulated by the pseudo-second-order kinetic mechanism than the pseudo-first-order, intra particle diffusion and Elovich models. Thermodynamic aspects of the adsorption of heavy metals were also investigated. Considering the applied desorbing agents for reuse of PWB for Ni(II) recovery, desorption cycle is not feasible due to the deterioration of the PWB structure.

Źródło:

Polish Journal of Chemical Technology; 2018, 20, 3; 20-28
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 47.

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: 48.

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: 49.

Tytuł:

The use of active carbon immobilised on chitosan beads for rb5 and bv10 dye removal from aqueous solutions

Autorzy:

Filipkowska, Urszula
Jóźwiak, Tomasz
Szymczyk, Paula
Kuczajowska-Zadrożna, Małgorzata

Powiązania:

https://bibliotekanauki.pl/articles/1034631.pdf

Data publikacji:

2017

Wydawca:

Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe

Tematy:

activity carbon
adsorption
chitosan
immobilisation

Opis:

This paper presents the adsorption of dyes – the anionic Reactive Black 5 (RB5) and cationic Basic Violet 10 (BV10) dyes – on activated carbon (AC) immobilised on chitosan (CHs). The results were compared with the removal efficiency of RB5 and BV10 on the individual sorbents: chitosan beads and activated carbon. In this study, the sorption capacities of the sorbents, sorption pH and the point of zero charge (pHZPC) were determined. For the description of the obtained results, the Freundlich, Langmuir and double Langmuir models were used. The results show that the developed sorbent (CHs-AC) is effective for both types of dye (RB5 or BV10) over a broad pH range 4–10, which makes it a universal sorbent. The maximum sorption capacity of CHs-AC with RB5 was 639.8 mg/g, while for BV10 it was 50.7 mg/g.

Źródło:

Progress on Chemistry and Application of Chitin and its Derivatives; 2017, 22; 14-26
1896-5644

Pojawia się w:

Progress on Chemistry and Application of Chitin and its Derivatives

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 50.

Tytuł:

Adsorption of cadmium ions on chitosan membranes: kinetics and equilibrium studies

Autorzy:

Zielińska, Katarzyna
Chostenko, Alexandre G.
Truszkowski, Stanisław

Powiązania:

https://bibliotekanauki.pl/articles/1035519.pdf

Data publikacji:

2010

Wydawca:

Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe

Tematy:

adsorption isotherm
cadmium
chitosan
membranes

Opis:

The presence of toxic heavy metals in industrial wastewater is a serious pollution problem. The ability of chitosan membranes as an adsorbent for cadmium ions in aqueous solution was studied. Experiments were carried out as function of contact time and concentration of cadmium ions. This study has shown that chitosan is capable of removing cadmium from aqueous solution. The removal efficiency depends on reaction time and concentration of cadmium. The Langmuir and Freundlich adsorption models were applied to describe the isotherms and isotherm constants. Equilibrium data agreed very well with the Langmuir model. The maximum adsorption capacity of the Langmuir isotherm equation was 94 mg/g and the Langmuir adsorption equilibrium constant was 1.6 × 10-3 dm3/mg at 25 °C.

Źródło:

Progress on Chemistry and Application of Chitin and its Derivatives; 2010, 15; 73-78
1896-5644

Pojawia się w:

Progress on Chemistry and Application of Chitin and its Derivatives

Dostawca treści:

Biblioteka Nauki

/5

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