Preparation of electrochemical removal lead ion imprinted composite film and its performance

doi:10.16085/j.issn.1000-6613.2016-2425

Abstract

Abstract: Ion-surface imprinting technology has been widely used to remove heavy metal ions existed in waste water,due to its high selectivity to the target ions and good chemical stability. In this paper, electroactive surface-imprinted composite film was prepared successfully using Pb²⁺ as the template ion, polyaniline(PANI)as the polymer matrix and hydroxylated carbon nanotubes(MWCNTs-OH)as imprinting substrate, during which,Pb²⁺ ions were eluted by applying constant positive potential to form imprinted cavities. The structures of MWCNTs-OH and imprinted film were characterized by Fourier transform infrared(FTIR)and X-ray diffraction(XRD). The Pb²⁺ ion separation performance of the film was studied by electrochemical quartz crystal microbalance(EQCM)and atomic absorption spectrophotometer(AAS).The results showed that the maximum ion exchange capacity of composite film was 359mg/g and had excellent selectivity for Pb²⁺at the presence of other heavy metals ions(Cd²⁺,Zn²⁺,Co²⁺,Ni²⁺),with the separation factor of Pb²⁺/Zn²⁺ reached 418.74. Besides, the film exhibited outstanding cycle stability and rapid adsorption/desorption properties. In conclusion, this novel ion-surface imprinted composite film can be used for the efficient separation and recovery of Pb²⁺ in wastewater.

Key words: ion-surface imprinting, electrochemistry, separation, lead ions, waste water

摘要： 离子表面印迹技术对目标离子具有较高的选择性和良好的化学稳定性，在去除废水中的重金属离子技术中得到广泛运用。本文以Pb²⁺为模板离子，聚苯胺（PANI）为高分子基体，羟基化碳纳米管（MWCNTs-OH）为印迹载体，施加恒定正电位洗脱Pb²⁺形成印迹孔穴，成功制备出具有电活性的Pb²⁺表面印迹复合膜。采用傅里叶红外（FTIR）和X射线衍射（XRD）对MWCNTs-OH和印迹复合膜进行结构表征。借助电化学石英晶体微天平（EQCM）和原子吸收分光光度计（AAS）对印迹复合膜的Pb²⁺分离性能进行研究。结果表明，离子印迹复合膜对Pb²⁺的交换量可达359mg/g，且在掺杂了其他重金属离子（Cd²⁺、Zn²⁺、Co²⁺、Ni²⁺）的含Pb²⁺溶液中对Pb²⁺表现出良好的选择性，其中Pb²⁺/Zn²⁺的分离因子可达418.74。此外，复合膜具有优异的循环稳定性和快速吸脱附速率。这种新型的离子表面印迹复合膜有望用于废水中重金属Pb²⁺的高效分离与回收。

关键词: 离子表面印迹, 电化学, 分离, 铅离子, 废水

CLC Number:

X703.1

LIU Xiuhong, WANG Yonghong, LIU Chengcen, HOU Mengjie, LI Long. Preparation of electrochemical removal lead ion imprinted composite film and its performance[J]. Chemical Industry and Engineering Progress, 2017, 36(09): 3422-3428.

刘秀红, 王永洪, 刘成岑, 侯蒙杰, 李龙. 电化学脱除Pb²⁺印迹复合膜的制备及其性能[J]. 化工进展, 2017, 36(09): 3422-3428.

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