Acta Phys. -Chim. Sin. ›› 2002, Vol. 18 ›› Issue (11): 1038-1042.doi: 10.3866/PKU.WHXB20021116

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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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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