X-RAY-ABSORPTION SPECTROSCOPY INVESTIGATION OF SURFACE REDOX TRANSFORMATIONS OF THALLIUM AND CHROMIUM ON COLLOIDAL MINERAL OXIDES

被引：156

作者：

BIDOGLIO, G

GIBSON, PN

OGORMAN, M

ROBERTS, KJ

机构：

[1] COMMISS EUROPEAN COMMUNITIES,INST ADV MAT,JOINT RES CTR,I-21020 ISPRA,ITALY

[2] SERC,DARESBURY LAB,WARRINGTON WA4 4AD,CHESHIRE,ENGLAND

[3] UNIV STRATHCLYDE,DEPT PURE & APPL CHEM,GLASGOW G1,SCOTLAND

来源：

GEOCHIMICA ET COSMOCHIMICA ACTA | 1993年 / 57卷 / 10期

关键词：

D O I：

10.1016/0016-7037(93)90576-I

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：

Examination of the adsorption mechanism of Tl and Cr on selected mineral oxides was carried out by X-ray Absorption Spectroscopy (XAS) using synchrotron radiation. Information on the oxidation states of surface bound species was obtained from the low energy side of XAS spectra, the XANES (X-ray Absorption Near Edge Structure) region. Surface precipitation of Tl2O3(S) was found to take place on delta-MnO2(s) as a result of Tl(I) sorption and oxidation at the mineral surface. Adsorption of chromates on alpha-FeOOH(s) containing very small amounts of ferrous ions was observed to be followed by partial reduction to Cr(III).

引用

页码：2389 / 2394

页数：6

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