Applied Surface Science, ( ISI ), Volume (301), No (1), Year (2014-4) , Pages (568-575)

Title : ( Kinetic and thermodynamic studies of Hg(II) adsorption onto MCM-41 modified by ZnCl2 )

Authors: Foad Raji , Majid Pakizeh ,

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Kinetics and thermodynamics of mercury ions sorption onto ZnCl2-MCM-41 sorbent were studied. Several rate models in the form of two main classes of mathematic kinetic models (adsorption reaction models and adsorption diffusion models) were investigated. Pseudo-first-order, pseudo-second-order, Elovich, film and intraparticle diffusion models were used to analyze the kinetic data. Results showed that the pseudo-second order model can well describe the adsorption kinetic data. The thermodynamic parameters, such as Gibb’s free energy change (G◦), standard enthalpy change (H◦) and standard entropy change (S◦) were also evaluated. Negative value of free energy at temperature range of 20–55 ◦C, indicates the spontaneous nature of Hg(II) sorption by ZnCl2-MCM-41 sorbent. The adsorption capacity which was found to decrease with temperature showed the exothermic nature of the mercury sorption process (H◦ = −49.4 kJ mol−1). The negative S◦ value (−148.9 J mol−1 K−1) revealed a decrease in the randomness at the solid/solution interface and also indicated the fast adsorption of the Hg(II) onto active sites.

Keywords

, Hg(II) adsorption, ZnCl2-MCM-41, Adsorption kinetic, Thermodynamic parameters, Pseudo-second order
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@article{paperid:1040719,
author = {Raji, Foad and Pakizeh, Majid},
title = {Kinetic and thermodynamic studies of Hg(II) adsorption onto MCM-41 modified by ZnCl2},
journal = {Applied Surface Science},
year = {2014},
volume = {301},
number = {1},
month = {April},
issn = {0169-4332},
pages = {568--575},
numpages = {7},
keywords = {Hg(II) adsorption; ZnCl2-MCM-41; Adsorption kinetic; Thermodynamic parameters; Pseudo-second order model},
}

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%0 Journal Article
%T Kinetic and thermodynamic studies of Hg(II) adsorption onto MCM-41 modified by ZnCl2
%A Raji, Foad
%A Pakizeh, Majid
%J Applied Surface Science
%@ 0169-4332
%D 2014

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