Semiconductor electrochemistry of coal pyrite [electronic resource].

Published:: Washington, D.C. : United States. Dept. of Energy, 1992.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: Pages: (14 pages) : digital, PDF file
Additional Creators:: Pennsylvania State University. Department of Materials Science, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

The kinetics of the formation of Fe(HS)[sup 2]-n[sub n,] the intermediate in the formation of FeS (from the reaction between aqueous sulfide ions and dissolved FE(II) salts) was studied with a stopped-flow spectrophotometric technique. As described in the previous report, the absorbance-time curve indicated that a black substance formed within the first few seconds of the reaction; this material subsequently decomposed gradually to give a lighter dark product within the following several minutes. It was proposed that an intermediate species, Fe(HS)[sup 2]-n[sub n], was formed initially from the reaction between Fe[sup 2+] and HS ions in aqueous solution and this intermediate was converted to FeS finally. The kinetic experiments showed that the rate of formation of Fe(HS)[sup 2]-n[sub n] was first order with respect to both Fe[sup 2+] and HS, with a rate constant of 103.81 (mol/l)[sup [minus]1]sec[sup [minus]1]. These results suggest that the black intermediate is FeHS[sup +].

Report Numbers:

E 1.99:doe/pc/91303-t4
doe/pc/91303-t4

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Note:

Published through SciTech Connect.
01/01/1992.
"doe/pc/91303-t4"
"DE93008124"
Wei, D.; Osseo-Asare, K.

Funding Information:

FG22-91PC91303

View MARC record | catkey: 13842134