(中南大学 冶金科学与工程学院，长沙 410083)
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。
关键字: 改性柑橘皮；吸附；重金属离子；吸附剂
aqueous solutions by MgCl2 modified orange peel
（School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China）
Abstract: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.
Key words: modified orange peel; adsorption; heavy metal ions; adsorbent
