巯基—聚吡咯薄膜修饰电极的制备及其电化学性能

The Preparation of Mercaptoacetic Acid-Polypyrrole Film Modified Electrode and Its Electrochemical Properties

摘要: 通过将巯基乙酸作为一种支持电解质,将巯基固定在导电聚吡咯薄膜电极上,从而制得巯基—聚吡咯薄膜修饰电极,该修饰电极保持了巯基的螯合性能,并具有良好的稳定性。对水溶液中的重金属离子具有很好的吸附作用,其灵敏度与未修饰的玻碳电极相比,测汞离子时电沉积提高了3倍,化学吸附时提高了近5倍。并对其吸附机理进行了初步的探讨,证明了其对汞离子的吸附为不可逆的产物弱吸附。

Abstract: This work shows that mercaptoacctic acid can be fixed on the conducting polypyrrole film electrode by one-step or two-step method. The mercaptoacetic acid-polypyrrole film chcmically modified electrode with surface unctionalization maintains the chelating