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Study of the adsorption-desorption of Cu2+, Cd2+ and Zn2+ in single and binary aqueous solutions using oxygenated carbons prepared by Microwave Technology

Dur�n-Jim�nez, G.; Hern�ndez-Montoya, V.; Montes-Mor�n, M. A.; Rangel-M�ndez, J. R.; Tovar-G�mez, R.

Authors

G. Dur�n-Jim�nez

V. Hern�ndez-Montoya

M. A. Montes-Mor�n

J. R. Rangel-M�ndez

R. Tovar-G�mez



Contributors

Abstract

In the present work was studied the adsorption-desorption of heavy metals from aqueous solutions using carbonaceous materials prepared with a technology that combines radiant and microwave heating. Three optimum carbons O-Cu, O-Cd and O-Zn were prepared and characterized using elemental analysis, potentiometric titration, nitrogen adsorption isotherms at - 196 °C, SEM/EDX analysis, and temperature programmed desorption (TPD). The three optimum carbons had very high oxygen contents mainly ascribed to surface functional groups of acidic nature. In contrast, the porosity of the carbons was very limited with specific surface areas being < 50 m2/g. Liquid adsorption isotherms were carried out and capacities of the three optimum carbons were 67, 26 and 24 mg/g for Cu2 +, Cd2 + and Zn2 +, respectively. The higher capacity of the O-Cu carbon was explained in terms of the higher electronegativity of metallic Cu and the theory of hard and soft acids and bases (HSAB) defined by Pearson, when compared with both Cd and Zn atoms. Additionally, the desorption percentage of heavy metals was lower than 10%.

Citation

Durán-Jiménez, G., Hernández-Montoya, V., Montes-Morán, M. A., Rangel-Méndez, J. R., & Tovar-Gómez, R. (2016). Study of the adsorption-desorption of Cu2+, Cd2+ and Zn2+ in single and binary aqueous solutions using oxygenated carbons prepared by Microwave Technology. Journal of Molecular Liquids, 220, 855-864. https://doi.org/10.1016/j.molliq.2016.05.027

Journal Article Type Article
Acceptance Date May 10, 2016
Online Publication Date May 24, 2016
Publication Date Aug 1, 2016
Deposit Date Jun 24, 2022
Journal Journal of Molecular Liquids
Print ISSN 0167-7322
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 220
Pages 855-864
DOI https://doi.org/10.1016/j.molliq.2016.05.027
Public URL https://nottingham-repository.worktribe.com/output/8636233
Publisher URL https://www.sciencedirect.com/science/article/abs/pii/S0167732216309680?via%3Dihub