Structural Incorporation of As5+ into Hematite

被引：84

作者：

Bolanz, Ralph M. ^{[1
]}

Wierzbicka-Wieczorek, Maria ^{[1
]}

Caplovicova, Maria ^{[2
]}

Uhlik, Peter ^{[2
]}

Goettlicher, Joerg ^{[3
]}

Steininger, Ralph ^{[3
]}

Majzlan, Juraj ^{[1
]}

机构：

[1] Univ Jena, Inst Geosci, D-07745 Jena, Germany

[2] Comenius Univ, Dept Econ Geol, Bratislava 84215, Slovakia

[3] Karlsruhe Inst Technol, Inst Synchrotron Radiat, D-76344 Eggenstein Leopoldshafen, Germany

来源：

ENVIRONMENTAL SCIENCE & TECHNOLOGY | 2013年 / 47卷 / 16期

关键词：

CRYSTAL-STRUCTURE; ARSENATE; FERRIHYDRITE; TRANSFORMATION; REFINEMENT; CHEMISTRY; PHOSPHATE; GOETHITE; GEOMETRY; OXIDES;

D O I：

10.1021/es305182c

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Hematite (alpha-Fe2O3) is one of the most common iron oxides and a sink for the toxic metalloid arsenic. Arsenic can be immobilized by adsorption to the hematite surface; however, the incorporation of As in hematite was never seriously considered. In our study we present evidence that, besides adsorption, the incorporation of As into the hematite crystals can be of great relevance for As immobilization. With the coupling of nanoresolution techniques and X-ray absorption spectroscopy the presence of As (up to 1.9 wt %) within the hematite crystals could be demonstrated. The incorporated As5+ displays a short-range order similar to angelellite-like dusters, epitaxially intergrown with hematite. Angelellite (Fe4As2O11), a triclinic iron arsenate with structural relations to hematite, can epitaxially intergrow along the (210) plane with the (0001) plane of hematite. This structural composite of hematite and angelellite-like clusters represents a new immobilization mechanism and potentially long-lasting storage facility for As5+ by iron oxides.

引用

页码：9140 / 9147

页数：8

共 27 条

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