电位调控的“离子印迹”聚苯胺电极柱在阴离子分析中的应用  

Application of "Ion Imprinted" Polyaniline Electrode Column Modulated by Potential in the Analysis of Anions

作　　者：陈智栋[1] 李雪莹[1] 孔泳[1] 秦勇[1] 

机构地区：[1]常州大学石油化工学院,江苏常州213164

出　　处：《分析测试学报》2011年第9期953-958,共6页Journal of Instrumental Analysis

基　　金：国家自然科学基金资助项目(20805021);江苏省高校自然科学基金资助项目(10KJB150004)

摘　　要：以氯离子为掺杂阴离子,采用化学氧化法合成了聚苯胺(PAn)。将PAn作为导电固定相填充到多孔陶瓷管中以制备PAn电极柱,并以此电极柱作为三电极体系中的工作电极。在电极柱上施加0.6 V的负电位使PAn呈还原态,PAn中掺杂的氯离子发生脱掺杂,从而在PAn骨架上留下在三维空间上与氯离子完全匹配的空穴,即形成了"离子印迹"PAn电极柱。当含有F-、Cl-、Br-、SO42-、H2PO4-的不同流动相流经该电极柱时,在该电极柱上施加+0.6 V的电位,由于PAn具有掺杂/脱掺杂完全可逆的性质,则流动相中的不同阴离子在静电作用下被掺杂到PAn骨架上。基于分子印迹的原理,"Cl-印迹"的PAn电极柱对Cl-具有最高的亲合力,对其它阴离子的亲合力则随着阴离子半径的增大而依次降低。在含不同阴离子电解液中,"离子印迹"PAn的循环伏安图也呈现了相似的规律。Polyaniline（PAn） was synthesized by chemical oxidation using Cl^-as the doping anions,and then it was packed into a porous ceramic tube as conductive stationary phase to fabricate an electrode column which was used as the working electrode of a three-electrode system.A potential of-0.6 V was applied on the electrode column to make PAn in its reduction state,and thus Cl^-was de-doped from the PAn backbone.Cavities complementary to Cl^-in three dimensional space were left in PAn to form ＂ion imprinted＂ PAn electrode column.Effects of various experimental factors on the de-doping amount of Cl^-were investigated,and the optimal conditions for de-doping were using a potential of-0.6 V,a dedoping time of 4 000 s and a pH value of 4.0.When different mobile phases containing F^-,Cl^-,Br^-,SO4^2-and H2PO-4 flew through the electrode column,a potential of ＋0.6 V was applied on this column.The different kinds of anions in the mobile phases were doped into the PAn backbone because of the reversible doping/de-doping property of PAn.The ＂Cl^-imprinted＂ PAn electrode column has the maximum affinity to Cl^-based on the mechanism of molecular imprinting,and its affinity to the other anions decreased with the increase of the anions radii.The cyclic voltammograms of the ＂ion imprinted＂ PAn in electrolytes containing different anions also showed a similar trend.Therefore,PAn was expected to be used as the stationary phase controlled by electrochemistry.

关 键 词：电位调控 离子印迹 聚苯胺 电极柱 阴离子分析 

分 类 号：O657.1[理学—分析化学] TQ423.11[理学—化学]