MgCl_2改性橘子皮对水溶液中镉镍的吸附性能

Adsorption of Cd^(2+) and Ni^(2+) from aqueous solutions by MgCl_2 modified orange peel

以橘子皮(OP)为原料通过MgCl2改性制备新型橘子皮吸附剂MgOP。考察溶液pH、固液比、温度、吸附时间和金属离子质量浓度对其从水溶液中吸附Cd2+和Ni2+的吸附性能的影响。采用扫描电镜及红外光谱仪对吸附剂进行表征。MgOP对2种金属离子的吸附率随pH和固液比的增大而增大;温度对吸附率的影响较小;吸附速度很快,能在20 min内达到吸附平衡。MgOP对Cd2+和Ni2+的吸附动力学均符合准二级动力学方程;MgOP对Cd2+和Ni2+的的Langmuir最大吸附量分别为125.47和44.58 mg/g。

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.