Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 150, Issue 3, Pages 765-773Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2007.05.037
Keywords
catechol removal; phenols; organophilic-bentonite; quaternary ammonium salts; adsorption; thermodynamics; kinetics
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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 L-1), temperature (30, 40, 50 +/- 1 degrees C and pH (5-12) of the adsorptive solution were investigated. Obtained results show that catechol could be removed efficiently (similar to 100%) at pH values >= 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 L-1). The magnitude of change of free energy (Delta G degrees), enthalpy (Delta H degrees) and entropy (Delta S degrees) were determined. (c) 2007 Elsevier B.V. All rights reserved.
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