Reduction of nitrobenzene and formation of corrosion coatings in zerovalent iron systems

被引：100

作者：

Huang, Yong H. ^{[1
]}

Zhang, Tian C. ^{[1
]}

机构：

[1] Univ Nebraska, Dept Civil Engn, Omaha, NE 68182 USA

来源：

WATER RESEARCH | 2006年 / 40卷 / 16期

关键词：

zerovalent iron; nitrobenzene; ferrous iron; iron oxides; iron corrosion;

D O I：

10.1016/j.watres.2006.06.016

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Batch tests were conducted to investigate reduction of nitrobenzene in a zerovalent iron system (Fe-0) under various conditions. The results indicated that a limited amount of nitrobenzene (ArNO2) could be reduced to aniline by Fe-0, but formation of a lepidocrocite (gamma-FeOOH) coating could significantly slow down the reaction. However, augmenting Fen with substoichiometric FeCl2 could dramatically accelerate the reaction. Surface-adsorbed Fe(II), not pH nor Cl-, was found to be responsible for rejuvenating the system. 02 and nitrobenzene could be concomitantly reduced by Fe-0 in the presence of Fe 2,. In the Fe-0 system, both nitrobenzene and O-2 favored formation of lepidocrocite; in the presence of aq. Fe(II), a stratified corrosion coating could develop, with magnetite (Fe3O4) as the inner layer and lepidocrocite as the outer layer. Fe2+ was not the main reductant for the reactions, but might accelerate the autoreduction of lepidocrocite to magnetite by the underlying Fe-0. our understanding on the role of Fe(II) in conjunction with a stratified, evolving corrosion coating may be useful for establishing an iron aquatic corrosion model. (c) 2006 Elsevier Ltd. All rights reserved.

引用

页码：3075 / 3082

页数：8

共 35 条

[1] Reduction of nitro aromatic compounds by zero-valent iron metal [J].