Oxidation of galena surface - an XPS study of the formation of sulfoxy species

被引:85
作者
Nowak, P
Laajalehto, K
机构
[1] Polish Acad Sci, Inst Catalysis & Surface Chem, PL-30239 Krakow, Poland
[2] Turku Univ, Mat Sci Lab, Dept Appl Phys, FIN-20014 Turku, Finland
基金
芬兰科学院;
关键词
galena; lead sulfide; galena oxidation; sulfidic sulfur oxidation;
D O I
10.1016/S0169-4332(99)00575-9
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
There are controversies existing in the literature, concerning the formation of sulfoxy species (sulfates, thiosulfates, sulfites) during the oxidation of galena (lead sulfide) surface. In view of those controversies, the XPS investigations of galena oxidation with the special reference to the oxidation of sulfide sulfur were undertaken. The results of the present work show that the sulfoxy species are formed at the galena surface under favorable conditions, even in the initial stage (first few minutes) of oxidation, and can be investigated by XPS. Those sulfoxy species may be best characterized as a mixture of thiosulfate and adsorbed SO(n) species. However, they are easily decomposed at the presence of atmospheric carbon dioxide and in the vacuum, even at the room temperature, therefore special precautions have to be undertaken to observe their formation by XPS. (C) 2000 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:101 / 111
页数:11
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