Title: Removal of Ni2+ from aqueous solution by rice bran

Authors: Xue-Song Wang, Yong Qin

Addresses: Department of Chemical Engineering, Huaihai Institute of Technology, Lianyungang, Jiangsu, 222005, China. ' School of Resources and Geo- Science, China University of Mining and Technology, Xuzhou, Jiangsu, 221008, China

Abstract: Rice bran, an agricultural by-product, was used for the sorptive removal of Ni2+ from aqueous solutions. Batch adsorption experiments were performed as a function of initial concentrations, contact time, pH and temperature. The experimental data were analysed by Langmuir, Freundlich and Redlich-Peterson isotherms. The equilibrium sorption capacity of Ni2+ was determined from the Langmuir equation and was found to be 28.36 mg/g. The sorption process follows pseudo-second-order kinetics. The thermodynamic parameters, such as ΔG and ΔS, have been calculated. The thermodynamics of Ni2+/rice bran system indicates the spontaneous nature of the process.

Keywords: isotherms; adsorption kinetics; rice bran; Ni2+ removal; thermodynamics; nickel; metal removal; sorption; biosorption; equilibrium; heavy metals; wastewater treatment; water pollution.

DOI: 10.1504/IJEP.2008.020804

International Journal of Environment and Pollution, 2008 Vol.34 No.1/2/3/4, pp.364 - 373

Published online: 16 Oct 2008 *

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