Thumbnail
Access Restriction
Open

Author Wei, D. ♦ Osseo-Asare, K.
Sponsorship USDOE
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CHEMISTRY ♦ PYRITE ♦ ELECTROCHEMISTRY ♦ PHOTOCHEMISTRY ♦ PH VALUE ♦ NITRIC ACID ♦ COAL PREPARATION ♦ ORE PROCESSING ♦ HYDROMETALLURGY ♦ ENVIRONMENTAL ENGINEERING ♦ GEOCHEMISTRY ♦ PHOTOVOLTAIC CONVERSION
Abstract Electrochemical and photoelectrochemical experiments were conducted to investigate the pyrite/aqueous interface reaction by using microparticles of synthetic pyrite as electrodes. The potential of the conduction bandedge of pyrite as a function of pH was estimated to be E{sub c} = 0.34--0.059 pH in volts vs. saturated calomel electrode (SCE). The open-circuit potential of pyrite electrode in 1 M HNO{sub 3} solution was 0.38 V{sub SCE}. Illumination of pyrite microelectrodes increased both the anodic current and the dissolution rate dramatically but had little effect on the cathodic current and the cathodic dissolution. These results indicate that pyrite, as an n-type semiconductor, dissolves anodically through a hole transfer (valence band) pathway, while cathodic dissolution only involves electron reaction (conduction band).
ISSN 00134651
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-10-01
Publisher Place United States
Journal Journal of the Electrochemical Society
Volume Number 143
Issue Number 10


Open content in new tab

   Open content in new tab