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将新型显色剂2-(5-碘-2-吡啶偶氮-2-二甲氨基苯胺)(5-I-PADMA)修饰在ITO玻璃电极上以捕获溶液中的钴离子,再将其在电极上原位还原,制备了纳米钴/ITO修饰电极,基于此建立了测定肼的电化学传感新方法.通过循环伏安法和安培法,对比研究了有无5-I-PADMA的两种传感器的构置及传感响应.实验结果表明:5-I-PADMA形成的修饰膜,可以高稳定存在,并有效捕获溶液体系中的钴离子,构置的传感器性能显著优于无显色剂的情况.该结果表明,将显色剂引入电化学体系,在完成传统的重金属污染处理的同时,可以二次利用富集后的金属离子,实现对一些电活性物质环境污染物的测定.“,”A new chromogenic agent 2-(5-iodine-2-pyridine azo)-2-dimethyl amine aniline (5-I-PADMA) was modified on ITO glass electrode to capture cobalt ions in solution system .Then, Co2+was reduced on the electrode in situ to prepare cobalt nanopartides /ITO.Based on the above strategy , a novel electrochemical sensor for the determination of hydrazine was established .Cyclic voltammetry and amperometry were employed to compare the fabrication and sensing behavior of the sensors with and without 5-I-PADMA.The results indicated that 5-I-PADMA could form high stable membrane and capture Co 2+effectively .The sensor with 5-I-PADMA showed significantly better performance than that without it.Introducing chromogenic agent onto electrochemical system , not only addressed traditional heavy metal pollution , but also contributed further detection of environmental pollutants with electrochemical activity , based on the metal ion-contained sensing membrane .