物理化学学报 >> 1996, Vol. 12 >> Issue (12): 1119-1123.doi: 10.3866/PKU.WHXB19961215

研究简报 上一篇    

硫酸溶液中Ag+离子对Mn2+离子阳极氧化的催化作用

李伟善,江琳才,黄仲涛   

  1. 华南师范大学化学系,广州 510631|华南理工大学化工系,广州 510641
  • 收稿日期:1996-04-18 修回日期:1996-09-06 发布日期:1996-12-15
  • 通讯作者: 李伟善

Anodic Oxidation of Mn2+ Ion in H2SO4 Solutions Catalyzed by Ag+ Ion

Li Wei-Shan,Jiang Lin-Cai,Huang Zhong-Tao   

  1. Department of Chemistry,South China Normal University,Guangzhou 510631|Department of Chemical Engineering,South China University of Technology,Guangzhou 510641
  • Received:1996-04-18 Revised:1996-09-06 Published:1996-12-15
  • Contact: Li Wei-Shan

关键词: 锰离子, 阳极氧化, 银离子, 催化, 硫酸溶液

Abstract:

Anodic oxidation of Mn2+ and Ag+ ions and anodic oxidation of Mn2+ ion on platinum electrode in H2SO4 solution catalyzed by Ag+ ion are studied by using RRDE and triangle voltammetry techniques. Mn2+ ion is oxidized on the anode surface with adsorped OH group to form a certain compound containing Mn3+, which causes Mn2+difficult to be oxidized directly on anode. Near the potential of oxygen evolution from H2O decomposition, Ag+ ion is oxidized to form Ag2+ ion. This is the main reaction on anode because of its reversability. At higher potential silver oxide is formed on the anode. The oxide catalyzes the decomposition of H2O strongly. The anodic oxidation of Mn2+ion catalyzed by Ag+ takes place and Ag2+ ion and silver oxide are no longer the product of Ag+ anodic oxidation when Mn2+ exists in solution at the potential for Ag+ anodic oxidation. It is confirmed that the catalysis reaction is homogeneous and very fast.

Key words: Manganous ion, Anodic oxidation, Silver ion, Catalysis, Sulphuric acid solution