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Equilibrium study of adsorption of L-cysteine by natural bentonite

Published online by Cambridge University Press:  09 July 2018

H. Faghihian  and
M. Nejati-Yazdinejad
H. Faghihian*
Affiliation:
Department of Chemistry, Isfahan University, Isfahan, I.R. Iran 81746-73441
M. Nejati-Yazdinejad
Affiliation:
Department of Chemistry, Isfahan University, Isfahan, I.R. Iran 81746-73441
*
*E-mail: [email protected]
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Abstract

L-cysteine (Cys) was adsorbed by bentonite (Ben) from aqueous solutions of variable concentrations and pHs. The raw materials and the adsorbed molecules (Ben-Cys) were characterized using X-ray diffraction (XRD), infrared spectroscopy (IR), thermal analysis methods (TG, DTG and DSC). The results indicated that the adsorption process depended strongly on pH, temperature and concentration of amino acid. Cysteine is specifically adsorbed on bentonite surface sites, probably through its NH3+ moiety. The pH dependence suggests that these sites may be silanolate groups (≡Si-O–). It is presumed that ion exchange interaction governs the adsorption process. The experimental data of adsorption isotherms obtained and analysed with the Langmuir model showed that this model fitted the adsorption data. Calculated thermodynamic parameters (ΔHº, ΔSº, and ΔGº) indicate that the adsorption processes were exothermic.

Keywords

bentoniteamino acidcysteineadsorptionisothermthermodynamics
Type
Research Article
Information
Clay Minerals , Volume 44 , Issue 1 , March 2009 , pp. 125 - 133
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2009

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