物理化学学报 >> 2002, Vol. 18 >> Issue (11): 1038-1042.doi: 10.3866/PKU.WHXB20021116

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Mn(Ⅱ)/Mn(Ⅲ)电对在硫酸溶液中氧化还原行为

米常焕;夏熙;张校刚   

  1. 新疆大学应用化学所,乌鲁木齐　830046
  • 收稿日期:2002-01-17 修回日期:2002-05-06 发布日期:2002-11-15
  • 通讯作者: 张校刚 E-mail:yhs@xju.edu.cn

Redox Behaviours of Mn(Ⅱ)/Mn(Ⅲ) in Sulphuric Acid

Mi Chang-Huan;Xia Xi;Zhang Xiao-Gang   

  1. Institute of Applied Chemistry, Xinjiang University, Urumqi　830046
  • Received:2002-01-17 Revised:2002-05-06 Published:2002-11-15
  • Contact: Zhang Xiao-Gang E-mail:yhs@xju.edu.cn

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摘要： 采用循环伏安法对Mn(Ⅱ)/Mn(Ⅲ)电对在硫酸溶液中铂电极上的氧化还原与Mn(Ⅱ)浓度、酸浓度、扫描速率、温度以及对流因素的函数关系进行了研究.结果发现,Mn(Ⅱ)在铂电极上Mn(Ⅱ)的氧化及Mn(Ⅲ)的还原均受扩散控制；升高温度和磁搅拌均能增加Mn(Ⅱ)氧化为Mn(Ⅲ)的速率；增加酸浓度和Mn(Ⅱ)浓度有利于增加Mn(Ⅲ)的稳定性,减少Mn(Ⅲ)的歧化和水解.

关键词: Mn(Ⅱ)/Mn(Ⅲ)电对, 电化学氧化, 电化学还原, 循环伏安, 酸溶液

Abstract: Oxidation of Mn(II) to Mn(Ⅲ) and reduction of Mn(Ⅲ) on platinum electrode in sulphuric acid were investigated by cyclic voltammetry as a function of the Mn(II) concentration ,acid concentration, scan rate, temperature and convection. It was found that oxidation of Mn(II) and reduction of Mn(Ⅲ) were mass transfer controlled. High temperature and stirring enhanced the oxidation rate of Mn(II) to Mn(Ⅲ).Increase of acid concentration or Mn(II) concentration favours the stability of Mn(Ⅲ), i.e. inhibits the disproportionation and hydrolysis of Mn(Ⅲ).

Key words: Mn(Ⅱ)/Mn(Ⅲ) redox, Electrochemical oxidation, Electrochemical reduction, Cyclic voltammetry, Acid solution