Accumulation and remobilization of aqueous chromium(VI) at iron oxide surfaces: Application of a thin-film continuous flow-through reactor

被引：27

作者：

Deng, YW ^{[1
]}

Stjernstrom, M ^{[1
]}

Banwart, S ^{[1
]}

机构：

[1] ROYAL INST TECHNOL,DEPT INORGAN CHEM,S-10044 STOCKHOLM,SWEDEN

来源：

JOURNAL OF CONTAMINANT HYDROLOGY | 1996年 / 21卷 / 1-4期

关键词：

D O I：

10.1016/0169-7722(95)00039-9

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

A thin-film continuous flow-through reactor was used to investigate reactions between aqueous Cr(VI) and two iron oxides, goethite and magnetite. Delayed effluent breakthrough of Cr(VI) indicated significant uptake by both oxides. Accumulation and remobilization of Cr(VI) depends on pH and the redox properties of the surface. For goethite the surface was quickly saturated and no further adsorption observed. Chromate anion (CrO42-) exhibited Langmuir-type adsorption. For magnetite, a significant slow steady-state rate of Cr(VI) uptake was observed. We propose two different mechanisms of chromium uptake: surface complexation of Cr(VI) species on goethite, and reductive precipitation of Cr(VI) at Fe(II) sites on magnetite.

引用

页码：141 / 151

页数：11

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