A flotation related X-ray photoelectron spectroscopy study of the oxidation of galena surface
A flotation related X-ray photoelectron spectroscopy study of the oxidation of galena surface
复制标题
DOI：
10.1016/s0927-7757(99)00214-9
复制
发表时间：
2000-02-15
影响因子：
5.2
通讯作者：
Kartio, I
中科院分区：
文献类型：
--
作者：
Nowak, P;Laajalehto, K;Kartio, I
通过 X 射线光电子能谱法 (XPS) 研究了方铅矿 (PbS) 表面氧化的初始步骤，特别关注水环境中的氧化。来自两个不同来源的方铅矿单晶被裂解并暴露于空气或水环境中。结果表明方铅矿表面有机污染物的存在可能对其表面氧化过程产生巨大影响。在空气氧化的情况下，杂质的存在改变了反应路径，选择性地抑制硫化物硫氧化成硫酸盐类物质。在水氧化的情况下，表面存在有机污染物（该污染物主要是羧酸及其盐）会抑制氧化。根据一致的溶解-氧化机制，在自发建立的电位下与水溶液接触的方铅矿表面上发现很少的氧化产物。 (C) 2000 Elsevier Science B.V. 保留所有权利。
The initial steps of the oxidation of galena (PbS) surface with special attention to the oxidation in an aqueous environment were investigated by the X-ray photoelectron spectroscopy method (XPS). Galena monocrystals from two different sources were cleaved and exposed to either air or an aqueous environment. The results show that the presence of organic contamination at the galena surface may exert a dramatic effect on the course of its surface oxidation. In the case of aerial oxidation, the presence of impurities changes the reaction path, suppressing the oxidation of sulfide sulfur to sulfate like species selectively. In the case of aqueous oxidation, the presence of organic contamination at the surface (this contaminants are supposed to be mainly the carboxylic acids and their salts) inhibits the oxidation. Very little oxidation products were found on the galena surface contacted with aqueous solutions at the spontaneously established potential, in accordance with the congruent dissolution-oxidation mechanism. (C) 2000 Elsevier Science B.V. All rights reserved.