中华医学超声杂志

应用化学 ›› 1994, Vol. 0 ›› Issue (2): 73-76.

• 研究论文 • 上一篇    下一篇

PtCl62-接着PVP修饰电极及其对Fe2+的催化氧化

杨大纲, 张五昌, 陆嘉星   

  1. 华东师范大学化学系 上海 200062
  • 收稿日期:1993-05-17 修回日期:1993-08-30 出版日期:1994-04-10 发布日期:1994-04-10

Bound PVP Modified Electrode in Catalytic Oxidation of Fe2+

Yang Dagang, Zhang Wuchang, Lu Jiaxing   

  1. Department of Chemistry, East China Normal University, Shanghai 200062
  • Received:1993-05-17 Revised:1993-08-30 Published:1994-04-10 Online:1994-04-10

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摘要： 研究了PtCl62-接着PVP修饰电极及其催化动力学,用循环伏安法考察了电极的电化学性质,结果表明在酸性溶液中对Fe2+的氧化有显着的催化作用,采用旋转圆盘电极法、极化曲线法等就电极对Fe2+氧化催化过程的控制步骤及有关动力学参数进行了测定。

关键词: 六氯铂酸, 聚－乙烯基吡啶, 修饰电极, 亚铁离子, 催化氧化

Abstract: The electrode coated with PVP(polyvinyl-pyridine) film electrostatically bound PtCl62- has been studied by means of cyclic voltammetry. The results showed that the electrode has a good electrocatalytic activity in the oxidation of Fe2+ to Fe3+ in aqueous acidic solution. The rate-controlling step and the kinetic parameters of catalytic reaction were determined by rotating disk electrode coated with PVP electrostaticaIIy bound PtCl62-. The rate constant of the catalvtic reaction was calculated to be 5.67?105cm3·mol-1·s-1. The number of electron transfered and the anodic transfer coeffcient were determined.The electrode coated with promoted PVP electrostatically bound PtCl62- give very stable response for the oxidation of Fe2+ to Fe3+.

Key words: hexachloroplatinic acid, polyvinylpyridine, chemical modified electrode, ferrousion, catalytic oxidation

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