日本金属学会誌

J. Japan Inst. Metals, Vol. 48, No. 3 (1984),
pp. 272-277

Oxidation of As(III) with Oxygen in Alkaline Solutions in the Presence of Cu(II)

Masao Iwai1, Hiroshi Majima2 and Yasuhiro Awakura2

1Department of Metallurgy, Toyama Technical College, Toyama
2Department of Metallurgy, Faculty of Engineering, Kyoto University, Kyoto

Abstract:

The kinetics of the oxidation of As(III) with oxygen in alkaline solutions in the presence of Cu(II) was studied. The oxidation reaction of As(III) proceeds via two different paths; one is independent of pO_2, while the other is dependent on pO_2. The former path is influenced by the concentration of alkali, showing the suppressed tendency with the increase in alkali concentration. On the other hand, the latter path is independent of the concentration of alkali. The dependences of the two paths on the concentration of Cu(II) appeared to be different from each other.
The experimental rate equation was found to be


(Received 1983/07/2)

Keywords:

arsenious ion, oxidation with oxygen, Cu(II) catalyst, alkaline solutions, kinetics


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