零流电位法考察聚苯胺膜的pH响应性质
Study on pH-Response of Polyaniline Film by Zero-current Potentiometry
摘 要
将经电化学聚合的聚苯胺膜修饰的铅笔芯电极连接于一种新型电化学检测系统中,采用零流电位法考察了聚苯胺膜的pH响应性质。结果表明:试验制得的聚苯胺膜主要以中间氧化态形态存在,在B-R缓冲溶液中pH可控的质子化和去质子化形态转换,导致零流电位Ezcp-pH曲线呈现两段相交的线性关系,其pH范围分别为pH 1.81~5.43及pH 5.43~9.91,两直线的交叉点在pH 5.43处,由此求得中间氧化态的pKa值为5.43。
聚苯胺膜
pH响应
pKa值
Zero-current potentiometry
Polyaniline film
pH-response
pKa value
Abstract
An electrochemically polymerized polyaniline film modified pencil graphite electrode was connected with the novel electrochemical testing system, and its pH-response was studied by the zero-current potentiometry. As shown by the experimental results, the polyaniline prepared was present mainly as the intermediate oxidative form of emeraldine. The protonation and de-protonation of polyaniline were dependent on pH-values of the B-R buffer medium, and linear relationships between values of Ezcp and pH were obtained in 2 sections in the ranges of pH 1.81-5.43 and pH 5.43-9.91, having the intersection at pH 5.43. The apparent pKa value of emeraldine was found to be 5.43 as calculated from the pH value.
中图分类号 O657.1
所属栏目
基金项目 国家自然科学基金项目(20775047、20905045);河南省科技攻关项目(102102310392);商丘师范学院青年基金资助项目(2010QN17)
收稿日期 2010/5/13
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备注武耐英(1980-),女,山西孝义人,副教授,博士,主要从事环境分析及电化学方面的研究。
引用该论文: WU Nai-ying,GAO Wei,ZHANG Xiang-fei,ZHU Xu,XU Mao-tian. Study on pH-Response of Polyaniline Film by Zero-current Potentiometry[J]. Physical Testing and Chemical Analysis part B:Chemical Analysis, 2011, 47(4): 380～382
武耐英,高伟,张向飞,朱旭,徐茂田. 零流电位法考察聚苯胺膜的pH响应性质[J]. 理化检验－化学分册, 2011, 47(4): 380～382
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参考文献
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【2】BHADRA S, KHASTGIR D, SINGHA N K, et al. Progress in preparation, processing and applications of polyaniline［J］. Prog Poly Sci, 2009,34:783-810．
【3】SLIM C, KTARI N, CAKARA D, et al. Polyaniline films based ultramicroelectrodes sensitive to pH［J］. J Electroanal Chem, 2008,612:53-62．
【4】LINDFORS T, IVASKA A。 Raman based pH measurements with polyaniline［J］. J Electroanal Chem, 2005,580:320-329．
【5】MAEIKIEN R, TOMKUT V, KUODIS Z, et al. Raman spectroelectrochemical study of polyaniline and sulfonated polyaniline in solutions of different pH［J］. Vib Spectrosc, 2007,44:201-208．
【6】ADHIKARI B, MAJUMDAR S. Polymers in sensor applications［J］. Prog Polym Sci, 2004,29:699-766．
【7】KAEMPGEN M, ROTH S. Transparent and flexible carbon nanotube/ polyaniline pH sensors［J］. J Electroanal Chem, 2006,586:72-76．
【8】GAO Wei, SONG Jun-feng. Towards surface acid-base property of the carboxylic multi-walled carbon nanotubes by zero current potentiometry［J］. Electrochem Commun, 2009,11:1285-1288．
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