Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
583695 | Journal of Hazardous Materials | 2008 | 9 Pages |
Abstract
Organophilic-bentonite, produced by exchange of cetyltrimethylammonium cation for metal cations on the bentonite, was exploited as adsorbent for removal of catechol from aqueous solutions using batch technique. The dependence of removal on various physico-chemical parameters, such as contact time (1-250 min), concentration (0.8-15.3 mmol Lâ1), temperature (30, 40, 50 ± 1 °C) and pH (5-12) of the adsorptive solution were investigated. Obtained results show that catechol could be removed efficiently (â¼100%) at pH values â¥9.9. The uptake process follows first-order rate kinetics and the equilibrium data fit well into the Langmuir and Freundlich adsorption isotherms over a wide range of concentration (1-10 mmol Lâ1). The magnitude of change of free energy (ÎG°), enthalpy (ÎH°) and entropy (ÎS°) were determined.
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Authors
K. Shakir, H.F. Ghoneimy, A.F. Elkafrawy, Sh.G. Beheir, M. Refaat,