Journal
ARABIAN JOURNAL OF CHEMISTRY
Volume 9, Issue -, Pages S1077-S1083Publisher
ELSEVIER
DOI: 10.1016/j.arabjc.2011.12.013
Keywords
Adsorption; Cork biomass; Cadmium; Equilibrium; Kinetics; Modeling; Thermodynamics
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The removal of toxic metal, cadmium, by using adsorption into Algerian cork biomass was investigated. The biosorption process was studied with respect to contact time, particle size, pH and temperature. The results showed that equilibrium was reached within 1 h. The used biosorbent gave the highest adsorption capacity at pH 6. The experimental isotherm data were analyzed and modeled. The maximum adsorption capacity, Langmuir's q(max), improved from 9.65 to 14.77 mg/g as the temperature increased from 20 to 40 degrees C. The enthalpy Delta H degrees and entropy Delta S degrees values were respectively estimated at 110.47 kJ mol(-1) and 0.3795 kJ K-1 mol(-1) for the process, which reflects the endothermic nature and the spontaneous feasibility of the present sorption system. Besides, the adsorption kinetics was found to follow the second-order model, suggesting therefore a possible chemisorption process. (C) 2011 Production and hosting by Elsevier B.V. on behalf of King Saud University.
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