期刊
ARABIAN JOURNAL OF CHEMISTRY
卷 7, 期 6, 页码 1091-1098出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.arabjc.2012.03.020
关键词
Acacia nilotica; Biomass; Cadmium; Lead; Kinetics
In the present study a biomass derived from the leaves of Acacia nilotica was used as an adsorbent material for the removal of cadmium and lead from aqueous solution. The effect of various operating variables, viz., adsorbent dosage, contact time, pH and temperature on the removal of cadmium and lead has been studied. Maximum adsorption of cadmium and lead arises at a concentration of 2 g/50 ml and 3 g/50 ml and at a pH value of 5 and 4, respectively. The sorption data favored the pseudo-second-order kinetic model. Langmuir, Freundlich and Dubinin-Radushkevich (D-R) models were applied to describe the biosorption isotherm of the metal ions by A. nilotica biomass. Based on regression coefficient, the equilibrium data found were fitted well to the Langmuir equilibrium model than other models. Thermodynamic parameters such as free energy change (Delta G degrees), enthalpy change (Delta H degrees) and entropy change (Delta S degrees) have been calculated, respectively revealed the spontaneous, endothermic and feasible nature of adsorption process. The activation energy of the biosorption (Ea) was estimated as 9.34 kJ mol(-1) for Pb and 3.47 kJ mol(-1) for Cd from Arrhenius plot at different temperatures. (C) 2012 Production and hosting by Elsevier B.V. on behalf of King Saud University.
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