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Adsorption of Ni (II) from aqueous solution by magnetic chitosan resin

Hai Song, Xinghai Yu, Shuping Jin, Xuejian Ma, Yuanzhi Zheng, Guifang Yan, Xiaoqin Zhang

The purpose of this work is to prepare a low-cost biosorbent, Magnetic chitosan resin (MCR), and determine the ability of this biosorbent to removing Ni (II) ion from aqueous medium. The characteristics of this biosorbent such as adsorption isotherms, the influence of pH value, adsorption time and temperature were all researched. The adsorption equilibriumwas achieved after about 150min at pH = 6 and the equilibrium date were fitted better with the Langmuir isothermequation than Freundlich mode. The maximum adsorption capacity was 14.47 mg·g-1. Both kinetics and thermodynamic parameters of the adsorption process were also estimated. The thermodynamic parameters indicated an exothermic spontaneous process and the kinetics followed the second-order adsorption process. Moreover, the magnetic chitosan resin (MCR) could be regenerated through the desorption of the Ni (II) ions using 0.1 mol·L-1 HCL solution and could be reused to adsorb again. Overall the results reported herein indicated that the magnetic chitosan resin (MCR) with high adsorption efficiency and magnetic property is very attractive and implies a potential of practical application for removing Ni (II) ion from aqueous medium.