Xie Gang, Zhou Lincheng, Gao Weijie, Li Yanfeng
State Key Laboratory of Applied Organic Chemistry, College of Resources and Environment, Institute of Biochemical Engineering and Environmental Technology, Lanzhou University, Lanzhou, 730000, People's Republic of China.
Environ Sci Pollut Res Int. 2015 May;22(9):7082-92. doi: 10.1007/s11356-014-3809-4. Epub 2014 Dec 12.
Nitrobenzene (NB) is considered a toxic and potential carcinogen. Continuous contamination has resulted in an urgent need for remediation. Fenton reagent provides an advanced oxidation process that is capable of remediating recalcitrant nitroaromatic compounds, such as NB. However, one drawback of Fenton chemistry is that the reaction requires acidic pH to prevent precipitation of iron. Our studies have investigated Fenton conversion of NB at near-neutral pH with several organic additives: β-cyclodextrin (β-CD), hydroxypropyl-β-cyclodextrin (HPCD), carboxymethyl-β-cyclodextrin (CMCD), and polyethylene glycol (molecular weight (MW) = 200, 400, and 600) for developing a process for treating NB-contaminated waters. The main factors influencing NB conversion, such as iron concentration, hydroxyl radicals (·OH) scavengers, and kinds or concentration of organic additives, were examined. Meanwhile, the reactive mechanisms and kinetics were investigated for Fenton conversion of NB. The results show that organic additives for Fenton process should be a good alternative for the advanced treatment of NB at near-neutral pH.
硝基苯（NB）被认为是一种有毒的潜在致癌物。持续的污染导致了对修复的迫切需求。芬顿试剂提供了一种高级氧化工艺，能够修复难降解的硝基芳香化合物，如NB。然而，芬顿化学的一个缺点是该反应需要酸性pH值以防止铁沉淀。我们的研究调查了在近中性pH条件下，使用几种有机添加剂（β-环糊精（β-CD）、羟丙基-β-环糊精（HPCD）、羧甲基-β-环糊精（CMCD）和聚乙二醇（分子量（MW）=200、400和600））对NB进行芬顿转化，以开发一种处理受NB污染水体的工艺。研究了影响NB转化的主要因素，如铁浓度、羟基自由基（·OH）清除剂以及有机添加剂的种类或浓度。同时，对NB的芬顿转化反应机理和动力学进行了研究。结果表明，芬顿工艺中的有机添加剂应该是近中性pH条件下对NB进行深度处理的一个良好选择。
