作　　者： ; ; ; ;

机构地区： 教育部

出　　处： 《环境科学学报》 2014年第4期920-924,共5页

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. 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 Fe0column-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 Fentonlike 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.

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

领　　域： [环境科学与工程]