Keywords: isotherms, adsorption kinetics, rice bran, Ni2&, #43, removal, thermodynamics, nickel, metal removal, sorption, biosorption, equilibrium, heavy metals, wastewater treatment, water pollution
Removal of Ni2+ from aqueous solution by rice bran
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.