水溶液中铜和铅在4'-甲基苯并-15-冠-5修饰的膨润土上的吸附
Adsorption of copper and lead in aqueous solution onto bentonite modified by 4'-methylbenzo-15-crown-5.
作者信息
Liu Yun, Shen Xing, Xian Qiming, Chen Haidong, Zou Huixian, Gao Shixiang
机构信息
State Key Laboratory of Pollution Control and Resource Reuse, School of Environment, 22 Hankou Road, Nanjing University, Nanjing 210093, China.
出版信息
J Hazard Mater. 2006 Sep 21;137(2):1149-55. doi: 10.1016/j.jhazmat.2006.03.057. Epub 2006 Apr 7.
The adsorption of heavy metal ions (Cu2+ and Pb2+) onto organobentonite modified by 4'-methylbenzo-15-crown-5 (MB15C5) from bentonite compared with natural bentonite (N-Bentonite) is described in this paper. The kinetic parameters of the models are calculated and discussed, and closely fitted a pseudo-second-order model in all cases. For bentonite modified with MB15C5 (MB15C5-Bentonite) and N-Bentonite, the equilibrium data closely fitted the Langmuir model and showed the following affinity order: Pb2+ > Cu2+, and the adsorption capacity of MB15C5-Bentonite is higher than that of N-Bentonite for Pb2+ and Cu2+. The effect of pH is examined over the range 1.5-6. The adsorption of Cu2+ and Pb2+ increases with increasing pH and the adsorption of Cu2+ and Pb2+ reaches a maximum at pH 3.5-6.
本文描述了4'-甲基苯并-15-冠-5（MB15C5）改性有机膨润土对重金属离子（Cu2+和Pb2+）的吸附，并与天然膨润土（N-膨润土）进行了比较。计算并讨论了模型的动力学参数，在所有情况下均与准二级模型紧密拟合。对于用MB15C5改性的膨润土（MB15C5-膨润土）和N-膨润土，平衡数据与Langmuir模型紧密拟合，显示出以下亲和顺序：Pb2+>Cu2+，且MB15C5-膨润土对Pb2+和Cu2+的吸附容量高于N-膨润土。考察了pH值在1.5至6范围内的影响。Cu2+和Pb2+的吸附量随pH值升高而增加，且Cu2+和Pb2+的吸附在pH值为3.5至6时达到最大值。
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