2011•Journal of Central South University(Science and Technology)Requires access
Adsorption of Cd~(2+) and Ni~(2+) from aqueous solutions by MgCl_2 modified orange peel
Qinghua Tian
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Abstract
Orange peel(OP) was modified with MgCl2 to prepare a novel orange peel adsorbent named as MgOP.The effects of pH,ratio of solid to liquid,temperature,contact time and metal ion mass concentration on Cd2+ and Ni2+ adsorption from aqueous solutions by MgOP were investigated.SEM and FTIR were used to characterize the adsorbent.The adsorption efficiencies of Cu2+ and Cd2+ by MgOP increase with the increase of pH and the ratio of solid mass to liquid volume.The temperature has little effect on adsorption capacity,and both adsorption processes are very fast and can attain equilibrium with 20 min.Both kinetics data of Cd2+ and Ni2+ are fitted to pseudo-second-equation.The maximum adsorption capacity of Cd2+ and Ni2+ by MgOP are 125.47 and 44.58 mg/g,respectively.