Potential application of highly reactive Fe(0)/Fe3O4 composites for the reduction of Cr(VI) environmental contaminants

被引:69
|
作者
dos Santos Coelho, Flavia [1 ]
Ardisson, Jose Domingos [2 ]
Moura, Flavia C. C. [3 ]
Lago, Rochel M. [1 ]
Murad, Enver [1 ,4 ]
Fabris, Jose Domingos [1 ]
机构
[1] Univ Fed Minas Gerais, Dept Quim, ICEx, BR-31270901 Belo Horizonte, MG, Brazil
[2] CDTN, Lab Fis Aplicada, Belo Horizonte, MG, Brazil
[3] Univ Fed Ouro Preto, ICEB, Dept Quim, BR-35400000 Ouro Preto, MG, Brazil
[4] Bayer Landesamt Umvelt, D-95603 Marktredwitz, Germany
关键词
chromium reduction; iron metal; magnetite; mechanical alloying;
D O I
10.1016/j.chemosphere.2007.10.016
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
We describe the use of highly reactive Fe(0)/Fe3O4 composites for the reduction of Cr(VI) species in aqueous medium. The composites were prepared by simple mechanical alloying of metallic iron and magnetite in different proportions, i.e. Fe(0) 25, 50, 75 and 90 wt%. While after 3 h of reaction pure Fe(0) and pure Fe3O4 showed only a low reduction efficiency of 15% and 25% Cr(VI) conversion, respectively, the composites, in particular Fe(0)(25 wt%)/Fe3O4, showed a remarkable activity with ca. 65% Cr(VI) conversion. Kinetic experiments showed a high reaction rate during the first 3 h, which subsequently decreased strongly, probably due to a pH increase from 6 to 8. Experiments with composites based on Fe(0)/alpha-Fe2O3, Fe(0)/gamma-Fe2O3 and Fe(0)/FeOOH showed very low activities, suggesting that Fe-oct(2+) in the magnetite structure plays an important role in the reaction. Scanning and high resolution electron microscopies and Mossbauer spectra (transmission and conversion electron Mossbauer spectroscopy) indicated that the mechanical alloying process promotes a strong interaction and interface between the metallic and oxide phases, with the Fe(0) particles completely covered by Fe3O4 particles. The high efficiency of the composite Fe(0)/Fe3O4 for Cr(VI) reduction is discussed in terms of a special mechanism where an electron is transferred from Fe(0) to magnetite to reduce Fe-oct(3+) to Fe-oct(2+), which is active for Cr(VI) reduction. (C) 2007 Elsevier Ltd. All rights reserved.
引用
收藏
页码:90 / 96
页数:7
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