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环境化学  2015 

零价铁/过二硫酸盐去除水中硝基苯的还原与氧化机理

Keywords: 硝基苯,苯胺,零价铁,过二硫酸盐,还原与氧化

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Abstract:

探讨了零价铁(Fe0)/过二硫酸盐(PS)去除水中硝基苯(NB)体系中还原反应和氧化反应之间的相互影响机制.实验表明,采用依次投加Fe0和PS的方式去除NB,随着PS投加时间的推后,Fe0还原NB产生更多的苯胺(AN),加入PS后,氧化去除AN更彻底;在NB/Fe0/PS的反应体系中,当NB和AN同时存在,SO4-·易和AN反应,而基本不去除NB.酸性条件和增加Fe0投加量,利于Fe0还原NB产生更多的AN,增加PS投加量利于AN的氧化去除.投加PS后AN的去除可能主要是发生了Fe2+催化PS的类Fenton氧化反应.

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