Oxidation kinetics of ultrasmall colloidal chalcopyrite (CuFeS{sub 2}) with one-electron oxidants
- Univ. of Melbourne, Victoria (Australia); and others
The stopped flow technique has been used to study the oxidation of ultrasmall colloidal chalcopyrite (CuFeS{sub 2}) particles (diameter 50-90 {angstrom}) by the one-electron oxidants hexacyanoferrate(III) (Fe(CN){sub 6}{sup 3{minus}}) and hexachloroiridate(IV) (IrCl{sub 6}{sup 2{minus}}) in aqueous solution. The stoichiometry of the initial oxidation step corresponds to the reaction CuFeS{sub 2(s)} + 5H{sub 2}O {yields} Cu(OH){sub 2(s)} + Fe(OH){sub 3(s)} + 2S{sub (s)}{sup 0} + 5H{sup +} + 5e{sup {minus}}. Further oxidation of the elemental sulfur results in the formation of S{sub 2}O{sub 3}{sup 2{minus}} and SO{sub 4}{sup 2{minus}} in solution, as determined by ion chromatography. Time-resolved measurement of both the oxidant and chalcopyrite concentrations has provided a detailed understanding of the mechanism involved in the oxidation of colloidal chalcopyrite. 88 refs., 11 figs., 2 tabs.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- DOE Contract Number:
- W-31-109-ENG-38
- OSTI ID:
- 555057
- Journal Information:
- Journal of Physical Chemistry, Vol. 96, Issue 11; Other Information: PBD: 28 May 1992
- Country of Publication:
- United States
- Language:
- English
Similar Records
A high temperature diffraction-resistance study of chalcopyrite, CuFeS{sub 2}
The electrochemistry of surface oxidation of chalcopyrite