Photocatalytic Oxidation of Cyanide.
Zhang-J; Hendrix-JL; Wadsworth-ME
Paper in Epd Congress '91 TMS 1991 :665-675
Fresh cyanide solution was treated by near-uv light with the assistance of photocatalysts. Cyanide was oxidized mainly to cyanate. Photochemical behavior of the anatase and rutile forms of tio2 was compared. It is found that anatase has a much higher activity than that of rutile. Bubbling of oxygen in the reactor showed no appreciable increase in cyanide oxidation, implying that the reaction is surface controlling. A very interesting finding in this study is that a natural mineral, ilmenite, can replace chemical titanium dioxide as the photocatalyst. Ilmenite without any treatment did not catalyze the oxidation of cyanide. But, after being roasted at high temperature with oxygen, the oxidation was enhanced dramatically. The mechanisms of photooxidation of cyanide and the roasting of ilmenite are proposed.
OP; Final Contract Report;
Paper in Epd Congress '91. TMS, 1991, PP. 665-675
Univ. of Nevada/g1175132-3223