• 关键词：硝基苯  苯胺  零价铁  过二硫酸盐  连续运行  亚铁离子  还原与氧化

• 基金项目：国家自然科学基金（No.21107101）

• 杨世迎
• 1. 海洋环境与生态教育部重点实验室, 青岛 266100;2. 中国海洋大学环境科学与工程学院, 青岛 266100

• 马楠
• 中国海洋大学环境科学与工程学院, 青岛 266100

• 王静
• 中国海洋大学环境科学与工程学院, 青岛 266100

• 王雷雷
• 中国海洋大学环境科学与工程学院, 青岛 266100

• 摘要：水中硝基苯（NB）的高毒性对人体健康具有极大的危害，因此，本文建立了零价铁-过二硫酸盐（Fe⁰-PS）连续运行体系以降解水中NB.研究结果表明，单独Fe⁰柱可还原降解NB，Fe⁰对不同浓度NB的还原效果均较好，随着流速的减慢及初始pH的降低，NB还原效果变好；但还原体系中总有机碳（TOC）基本没有去除，只是生成了中间产物苯胺（AN）.Fe⁰-PS联合体系中，随着PS的投加，产生的Fe²⁺活化PS，发生了类Fenton反应，从而使还原产物AN得以氧化降解，TOC去除率可达54.8%；随着Fe⁰填充量的增加，氧化产物Fe²⁺随之增加，还原产物AN随之减少.可见，Fe⁰-PS连续运行体系，以Fe²⁺为媒介巧妙结合还原与氧化作用，能有效去除NB.

• Abstract：Nitrobenzene (NB) in water poses significant health risks because of its persistence and high toxicity. A continuous operation system combining zero-valent iron (Fe⁰) and persulfate (PS) was developed to degrade NB in aqueous solution. Firstly, for Fe⁰ column-only system, NB removal increased with the decrease of the flow rate and that of the initial pH of solution. However, there was a negligible total organic carbon (TOC) removal because NB has merely been changed into aniline (AN), the intermediate product of NB reduced by Fe⁰. Secondly, for Fe⁰-PS system, as the PS dosing, a Fenton-like reaction took place during the reaction between the produced Fe²⁺ and the added PS. The probable production of sulfate radicals was attributed to the degradation of AN. The TOC removal was able to reach a rate as high as 54.8%. With the increasing of the dosage of Fe⁰, the concentration of Fe²⁺ increased and more AN was removed. In conclusion, the Fe⁰-PS continuous operation system, combined with reduction and oxidation via the medium, Fe²⁺, can effectively degrade NB in aqueous solution.

• Key words：nitrobenzene  aniline  zero-valent iron  persulfate  continuous operation system  ferrous ion  reduction and oxidation

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