Acta Phys. -Chim. Sin. ›› 1996, Vol. 12 ›› Issue (12): 1119-1123.doi: 10.3866/PKU.WHXB19961215

• Note • Previous Articles    

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

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