Enhanced nitrobenzene removal by persulfate-assisted zerovalent iron

doi:10.11949/j.issn.0438-1157.20171065

Abstract

Abstract:

The removal of nitrobenzene in the zerovalent iron-persulfate (ZVI-PS) system was investigated in this study. During the process of nitrobenzene reduction by pristine ZVI, fast adsorption of nitrobenzene was observed at pH_ini 3.0 and the removal rate was accelerated with the decrease of initial pH values. The increase of ZVI dosage enhanced the removal effectively and PS added to the system significantly promoted the removal rate of nitrobenzene. The cost of PS added was far less than the increase of counterpart of ZVI dosage to achieve the same removal effect. By XRD characterization of the precipitates after reaction, PS was supposed to enhance nitrobenzene removal by promoting ZVI corrosion and transformation of ZVI corrosion products. By FTIR characterization, it was determined that PS accelerated the nitrobenzene reduction process only, but did not change its reduction pathway. GC-MS results verified that the main product of nitrobenzene reduction by ZVI/ZVI-PS was aniline.

Key words: zerovalent iron, persulfate, reduction, nitrobenzene, aniline

摘要：

考察了过硫酸盐（PS）强化零价铁（ZVI）对水中硝基苯去除的性能。结果表明在单纯利用ZVI还原去除硝基苯过程中，初始pH 3.0时初期去除硝基苯速率较快，初始pH 4.0～7.0时随pH的升高反应速率减慢，而ZVI投量的增加对去除速率有较大提升作用。向体系中投加PS能显著促进零价铁去除硝基苯的速率，在达到相同去除效果的情况下，外加PS的成本远远小于提升ZVI投量所引起的成本增加。综合固体产物的XRD表征得知，PS提高ZVI去除硝基苯的效果主要是通过促进ZVI的腐蚀和改变ZVI腐蚀产物的种类来实现。通过FTIR表征可知，外加PS仅对硝基苯去除过程起加速作用，而不改变其还原路径。GC-MS的结果则验证了硝基苯被ZVI/ZVI-PS降解的主要产物为苯胺。

关键词: 零价铁, 过硫酸盐, 还原, 硝基苯, 苯胺

CLC Number:

X522
X592

FAN Peng, CHEN Jie, GUAN Xiaohong, QIAO Junlian. Enhanced nitrobenzene removal by persulfate-assisted zerovalent iron[J]. CIESC Journal, 2018, 69(5): 2175-2182.

樊鹏, 陈杰, 关小红, 乔俊莲. 过硫酸盐强化零价铁还原去除硝基苯的实验研究[J]. 化工学报, 2018, 69(5): 2175-2182.

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