PALLADIUM SORPTION AND REDUCTION ON SULFIDE MINERAL SURFACES - AN XPS AND AES STUDY

被引：41

作者：

HYLAND, MM ^{[1
]}

BANCROFT, GM ^{[1
]}

机构：

[1] UNIV WESTERN ONTARIO,DEPT MED,LONDON N6A 5B7,ONTARIO,CANADA

来源：

GEOCHIMICA ET COSMOCHIMICA ACTA | 1990年 / 54卷 / 01期

关键词：

D O I：

10.1016/0016-7037(90)90200-5

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

High resolution X-ray photoelectron spectroscopy (XPS) and Auger electron spectroscopy (AES) were used to study the sorption/reduction of aqueous Na2PdCl4 at FeS2, PbS, and (Zn, Fe)S surfaces. Two concurrent reactions take place: the sorption of Pd(II) and the reduction of Na2PdCl4(aq) to Pd(0). Detailed studies on pyrite indicate the reduction is dependent on Cl- and H+ concentrations, which control the concentration of the electroactive species, PdCl2(H2O)2 and/or PdCl2(H2O)(OH)-. Palladium metal deposition and crystal growth take place at high energy sites on the mineral surface. The surfaces of PbS and (Zn, Fe)S become metal-depleted, and sulphide groups are oxidised to polysulphides. Pyrite oxidation was undetected by XPS but presumably results in the formation of soluble sulphoxy species. © 1990.

引用

页码：117 / 130

页数：14

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