| 零流电位法考察聚苯胺膜的pH响应性质 |
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| 引用本文： | 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(4). |
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| 作者姓名： | 武耐英 高伟 张向飞 朱旭 徐茂田 |
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| 作者单位： | 商丘师范学院化学系;上海烟草集团; |
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| 基金项目： | 国家自然科学基金项目(20775017、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) |
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| 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E_(ZCP)-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pK_a值为5.43。
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| 关 键 词： | 零流电位法 聚苯胺膜 pH响应 pK_a值 |
Study on pH-Response of Polyaniline Film by Zero-current Potentiometry |
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| 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 Analgsis,2011(4). |
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| Authors: | WU Nai-ying GAO Wei ZHANG Xiang-fei ZHU Xu XU Mao-tian |
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| Institution: | WU Nai-ying~1,GAO Wei~2,ZHANG Xiang-fei~1,ZHU Xu~1,XU Mao-tian~1 (1.Dept.of Chemistry,Shangqiu Normal College,Shangqiu 476000,China,2.Shanghai Tobacco Group Co.Ltd.,Shanghai 200082,China) |
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| 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 E_(zcp)and pH were obtai... |
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| Keywords: | Zero-current potentiometry Polyanilinc film pH-response pK_a value |
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