Application of Chitosan for the Removal of Metals From Wastewaters by Adsorption—Mechanisms and Models Review

Gérente, Claire; Lee, V. K. C.; Cloirec, Pierre Le; McKay, Gordon

doi:10.1080/10643380600729089

Cited by 719 publications

(387 citation statements)

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“…Other studies showed that chitosan alone has the ability to remove heavy metals from water and wastewater (Gerente et al, 2007). Accordingly, the main hypothesis of this study was to investigate the efficiency of chitosan and bentonite clay together.…”

Section: Resultsmentioning

confidence: 99%

Exploratory study to assess the impact of chitosan /bentonite ratio on the metal removal capacity of chitosan modified bentonite clay

2016

Global NEST Journal

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Adsorption is one of the methods that can be used for metal removal. In this study five metals were used cadmium, chromium, lead, copper and nickel (Cd, Cr, Pb, Cu, and Ni) over a concentration range from 0.8 to about 7 mg l -1 for each metal. Adsorbents were prepared with increasing chitosan to bentonite ratio from 0 to 0.67 g chitosan/g bentonite. The study showed that adsorption of metals on plain bentonite and chitosan modified bentonite can fit well with Langmuir and Freundlich adsorption isotherms. Furthermore, the bentonite adsorption capacity will decrease with the increase of chitosan/bentonite ratio. This study concluded that bentonite is a good adsorbent. However, the applicability of bentonite as potential adsorbent may be limited by its physical properties such as slow settling rate and difficulty to use it as an adsorbent in adsorption columns. Despite the decrease of maximum theoretical adsorption capacity as a result of chitosan modification, the addition of small amount of chitosan can improve the physical characteristics of bentonite clay to be used as an adsorbent.

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Section: Resultsmentioning

confidence: 99%

Exploratory study to assess the impact of chitosan /bentonite ratio on the metal removal capacity of chitosan modified bentonite clay

2016

Global NEST Journal

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“…Donde Co es la concentración inicial del ión metálico en la solución (mg/L), Ce es la concentración del ión metálico en el equilibrio (mg/L), V es el volumen de la solución (L) y m es la masa del adsorbente (g) (Gerente et al, 2007). Los valores numéricos de KF y n son obtenidos del intercepto y la pendiente, respectivamente, de la forma lineal de la isoterma de Freundlich:…”

Section: Isotermas De Adsorciónunclassified

“…Para evaluar los datos experimentales obtenidos para cada ión metálico, los modelos simplificados de pseudoprimer orden y pseudo-segundo orden fueron aplicados (Gerente et al, 2007).…”

Section: Modelos Cinéticosunclassified

“…Donde k1 es la constante de pseudo-primer orden (min-1), qe y qt son las capacidades de adsorción en el equilibrio y para un tiempo t (Gerente et al, 2007). Los valores numéricos de k1 y qe son obtenidos de la pendiente y del intercepto, respectivamente, de la forma lineal de la ecuación de pseudo-primer orden, la cual es Vol.…”

Section: Modelos Cinéticosunclassified

“…Donde k2 es la constante de pseudo-segundo orden (g/mgmin) (Gerente et al, 2007). Los valores numéricos de k2 y qe son obtenidos de la forma lineal de la ecuación de pseudo-segundo orden:…”

Section: Modelos Cinéticosunclassified

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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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New Alternative Fertilizers Based on Algae Biomass Loaded with Metal Ions

Bulgariu

2020

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Application of Chitosan for the Removal of Metals From Wastewaters by Adsorption—Mechanisms and Models Review

Cited by 719 publications

References 341 publications

Exploratory study to assess the impact of chitosan /bentonite ratio on the metal removal capacity of chitosan modified bentonite clay

Exploratory study to assess the impact of chitosan /bentonite ratio on the metal removal capacity of chitosan modified bentonite clay

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

New Alternative Fertilizers Based on Algae Biomass Loaded with Metal Ions

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