Stability of selenourea in aqueous solutions
Studies of the synthesis of metal selenides from aqueous solutions are being conducted within the framework of investigations on the creation of new semiconductor materials. Selenourea in solution is a complex multicomponent system. The products of hydrolytic decomposition are H/sub 2/CN/sub 2/, Se/sup 2 -/, and HSe/sup -/. As a result of the oxidation of selenium-containing decomposition products by atmospheric oxygen, elementary selenium is formed. The decomposition of selenourea in alkaline sulfite solutions is accompanied by the dissolution of Se/sup 2 -/ and HSe/sup 0/ ions (Se/sup 0/), with the formation of selenosulfate. A study of the kinetics of decomposition was conducted under the conditions of formation of metal selenides, which do not exclude the oxidation process. The end product of the decomposition of selenourea in alkaline sulfite solutions is selenosulfate. The formation of selenosulfate was demonstrated by the isolation of elementary selenium under the action of formaldehyde. The rate constants of the decomposition of selenourea were calculated by the method of changes in concentration, slope of the straight lines, and a logarithmic method. The use of methods of monitoring of selenourea and its decomposition products permitted a theoretical substantiation of the selection of the optimum conditions of formation of metal selenides.
- Research Organization:
- Urals Scientific-Research and Planning Inst. of the Copper Industry Unipromed, USSR
- OSTI ID:
- 5306071
- Journal Information:
- J. Appl. Chem. USSR (Engl. Transl.); (United States), Vol. 55:12; Other Information: Translated from Zh. Prikl. Khim.; 55: No. 12, 2719-2723(Dec 1982)
- Country of Publication:
- United States
- Language:
- English
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