Adsorption of copper cations at chitosan samples prepared by lyophilic drying

Соловцова, О. В.; Grankina, T. Yu.; Красильникова, О. К.; Serebryakova, N. V.; Shinkarev, Sergey

doi:10.1134/s2070205109010055

Cited by 5 publications

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“…There are some works that used the TVFM approach (including the Dubinin-Radushkevich equation) to describe the sorption of heavy metal ions onto polysaccharide sorbents [14,48,65,66].…”

Section: Dubinin-radushkevich Isotherm Of Sorptionmentioning

confidence: 99%

“…The ion-exchange mechanism was identified from the value of E evaluated using the Dubinin-Radushkevich equation for approximation of experimental isotherm. Solovtsova et al [66] carried out a comparative analysis of applicability of the Langmuir, Freundlich, Redlich-Peterson, and Dubinin-Radushkevich models to describe the sorption isotherms using the parameters related to adsorption process. It was shown that the Dubinin-Radushkevich equation (for liquid phase) best described the experimental isotherms.…”

Section: Dubinin-radushkevich Isotherm Of Sorptionmentioning

confidence: 99%

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Regularities of the effects of the nature of polysaccharide materials on distribution of heavy metal ions in a heterophase biosorbent–water solution system

Никифорова

Козлов

2016

Prot Met Phys Chem Surf

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The possibility of using cellulose-containing biosorbents obtained on the basis of agro-industrial wastes and byproducts to recover heavy metal ions from aqueous solutions was considered. The influence of the nature of sorbents (composition of biopolymers, content of carboxyl groups, specific surface, pore diameter and pore volume, swelling) on the kinetics and thermodynamics of distribution of heavy metal ions in a heterophase system consisting of water and biopolymer sorbent was determined. It was established that cellulose-based sorbents act as cationites at pH of 1-7, being inferior in their kinetic characteristics and sorption properties to commercial sorbents. Relying on literature data and the experimental results, it was found that the Langmuir, Freundlich, and TVFM models and other theories describe reasonably well the process (the correlation coefficients were 0.99); however, the Langmuir model provided the most exact determination of maximum sorption capacity of sorbents. It was concluded that, despite the comparatively low equilibriumkinetic characteristics, the cellulosic sorbents have received greater attention from researchers around the world due to their clear advantages with respect to ecological cleanliness, availability, and renewability of raw materials.

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“…There are some works that used the TVFM approach (including the Dubinin-Radushkevich equation) to describe the sorption of heavy metal ions onto polysaccharide sorbents [14,48,65,66].…”

Section: Dubinin-radushkevich Isotherm Of Sorptionmentioning

confidence: 99%

Section: Dubinin-radushkevich Isotherm Of Sorptionmentioning

confidence: 99%

Regularities of the effects of the nature of polysaccharide materials on distribution of heavy metal ions in a heterophase biosorbent–water solution system

Никифорова

Козлов

2016

Prot Met Phys Chem Surf

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“…3b, respectivamente), se puede observar cambios en la intensidad de las bandas de absorción de 36003370 cm-1, atribuibles a los grupos OH y NH2. Estos cambios indican la formación de complejos, los cuales aumentan las energías de los enlaces debido a los iones metálicos adsorbidos (Solovtsova et al, 2009). Así también, puede observarse un pico muy débil en la región de 2340 cm-1 (señalado con un círculo) que puede ser atribuido a la interacción CuN (Miller y Wilkins, 1952).…”

Section: Estudio Comparativo De La Adsorción De Cr(vi) En Quitosano Yunclassified

Estudio del equilibrio y cinética de adsorción de Cd(II), Ni(II) y Cr(VI) usando Quitosano y Quitosano modificado con cobre

Castro

Cruz

Betanco

et al. 2014

Nexo Revista Científica

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RESUMENEn este trabajo, se estudió el equilibrio y la cinética de adsorción de Cd(II), Ni(II) en quitosano y Cr(VI) en quitosano modificado con cobre. Para ello, soluciones de iones metálicos a diferentes concentraciones, fueron puestas en contacto con el adsorbente y se agitaron por un período de 3 -4 h. Al final del proceso, las muestras fueron analizadas en un espectrómetro de absorción atómica. Los datos experimentales del equilibrio de adsorción de los iones metálicos fueron evaluados aplicando las isotermas de Langmuir y Freundlich; mientras los datos cinéticos fueron evaluados utilizando los modelos cinéticos de pseudo-primer orden y pseudo-segundo orden. Los resultados del proceso demostraron que los iones fueron eficazmente adsorbidos por el quitosano (Cd y Ni) y por el Cuquitosano (Cr). Además, se comprobó que los datos experimentales del equilibrio de adsorción de Cr(VI) y Ni(II) se ajustan al modelo de Langmuir; mientras que los datos experimentales del Cd(II) fueron mejor ajustados por el modelo de Freundlich. Mediante el uso de la isoterma de Langmuir se determinó la capacidad máxima de adsorción de cromo (29.7 mg/g Cu-quitosano), cadmio (102.0 mg/g quitosano) y níquel (83.31 mg/g quitosano). Los resultados de la cinética de adsorción de los iones metálicos mostraron que los datos experimentales fueron mejor ajustados por el modelo de pseudo-segundo orden; es decir, el paso limitante en la velocidad es la reacción de adsorción y no la transferencia de masa.Palabras claves: isotermas de adsorción; cinética de adsorción; modelos cinéticos; metales pesados; quitosano; Cu-quitosano ABSTRACTIn this paper, the equilibrium and adsorption kinetics of Cr(VI), Cd(II) and Ni(II) onto Chitosan and Cu-chitosan was studied. Metal ion solutions at different initial concentration were put in contact with chitosan and Cu-chitosan and the mixture was agitated by 3 -4 h. Afterwards, the samples were analyzed by atomic absorption spectroscopy. The experimental data of adsorption equilibrium were evaluated by application of Langmuir and Freundlich isotherms; while the kinetics experimental data were evaluated using kinetic models of pseudo-first order and pseudo-second order. The results showed that the metallic ions were effectively adsorbed by the chitosan (Cd and Ni) and Cuchitosan (Cr). Besides, it was found that the experimental data of adsorption equilibrium of Cr(VI) and Ni(II) fit the Langmuir model, while the equilibrium adsorption data of Cd(II) were better fitted by Freundlich model. The maximum adsorption capacity of chromium (29.7 mg/g Cu-chitosan), cadmium (102.0 mg/g chitosan) and nickel (83.31 mg/g chitosan) was determined using the Langmuir model. The results of adsorption kinetics of the metallic ions showed that the experimental data were better adjusted by pseudo-second order model. Therefore, the ratelimiting step is the adsorption reaction and not mass transfer processes.

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“…For such systems, it is most promising to investigate changes in the structure and mobility of molecules because of a change in the poly mer volume during adsorption. For example, the adsorption capacity of freeze dried chitosan in the adsorption of water vapor and metal cations is much higher than that of the same adsorbent dried at room temperature [7]. For such adsorbents, the shrinkage of an adsorbent in during drying and its subsequent swell ing affect significantly its adsorption properties [8].…”

mentioning

confidence: 99%

Volume change induced by water vapor sorption in cellulose dried under supercritical conditions

et al. 2013

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Adsorption of copper cations at chitosan samples prepared by lyophilic drying

Cited by 5 publications

References 11 publications

Regularities of the effects of the nature of polysaccharide materials on distribution of heavy metal ions in a heterophase biosorbent–water solution system

Regularities of the effects of the nature of polysaccharide materials on distribution of heavy metal ions in a heterophase biosorbent–water solution system

Estudio del equilibrio y cinética de adsorción de Cd(II), Ni(II) y Cr(VI) usando Quitosano y Quitosano modificado con cobre

Volume change induced by water vapor sorption in cellulose dried under supercritical conditions

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