MgCl_2改性柑橘皮对水溶液中重金属离子的吸附性能  

Adsorption of heavy metal ions from aqueous solutions by MgCl_2 modified orange peel

作　　者：郭学益[1] 梁莎[1] 肖彩梅[1] 田庆华[1] 

机构地区：[1]中南大学冶金科学与工程学院,长沙410083

出　　处：《中国有色金属学报》2011年第9期2270-2276,共7页The Chinese Journal of Nonferrous Metals

基　　金：国家自然科学基金资助项目(50774100)

摘　　要：以柑橘皮(OP)为原料,通过MgCl2进行改性制备新型柑橘皮生物吸附剂MgOP。考察溶液pH值、温度、固液比、吸附时间和金属离子浓度对MgOP从单组分溶液中吸附Cu2+、Cd2+、Pb2+、Zn2+和Ni2+的吸附性能的影响。结果表明,pH值和固液比对吸附率的影响较明显;温度对吸附率的影响较小;所有吸附过程可在20 min内达到吸附平衡,对5种金属离子的吸附动力学均符合准二级动力学方程;与原始柑橘皮相比,MgOP对5种金属离子的最大吸附量显著提高;MgOP可重复使用10次以上;共存金属离子对吸附率影响很小。Orange peel（OP） was modified by MgCl2 to prepare a novel orange peel adsorbent named as MgOP.The effects of pH,temperature,solid/liquid ratio,adsorption time and metal ion concentration on the removal behavior of individual heavy metals such as Cu2＋,Cd2＋,Pb2＋,Zn2＋ and Ni2＋ from aqueous solution with single component by MgOP were investigated.The results show that pH and solid/liquid ratio have positive effects on the adsorption efficiency;temperature has little impact on the adsorption efficiency.All adsorption processes can attain equilibrium within 20 min,and the kinetics data of five kinds of metal ions are fitted to pseudo-second-equation.The MgOP can increase the maximum adsorption capacities of Cu2＋,Cd2＋,Pb2＋,Zn2＋ and Ni2＋,compared with those of OP.The MgOP can be used for more than 10 cycles.The effect of coexisting metal ions on adsorption can be neglected.

关 键 词：改性柑橘皮 吸附 重金属离子 吸附剂 

分 类 号：X703.1[环境科学与工程—环境工程]