AN XPS STUDY OF PRODUCTS FORMED ON Pyrite and pyrrhotine BY REACTING WITH PALLADIUM(II) CHLORIDE SOLUTIONS
A. S. Romanchenko, Yu. L. Mikhlin
Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russia
Keywords: X-ray photoelectron spectroscopy, sulfide minerals, pyrite, pyrrhotine, palladium sulfides, palladium chloride complexes
Abstract
X-ray photoelectron spectroscopy (XPS) is used to study the products formed by reacting the main iron sulfide minerals-pyrite and pyrrhotine-with an H2PdCl4 solution (pH 2, 25 °C). Palladium deposition data are obtained depending on time and the pretreatment of the surface of the minerals. Palladium is shown to be bonded as PdS sulfide nanoparticles and, to a small degree, as an adsorbed Pd(II) chloride complex. Preoxidation of the minerals has little effect on the composition of Pd-containing surface products on pyrrhotine, but on pyrite a part of Pd(II) is reduced to metal and lower sulfides. No reduced products form if oxidation results in a metal-deficient polysulfide layer on the surface.
DOI: http://dx.doi.org/10.1134/S002247661503021X
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