空化水射流结合Fenton处理硝基苯废水的实验  

Experimental study on nitrobenzene by cavitating water jets assisted with Fenton

作　　者：卢义玉[1] 蒋林艳[1] 夏彬伟[1] 左伟芹[1] 张赛[1] 赵艳萍[1] 

机构地区：[1]重庆大学资源及环境科学学院,重庆400044

出　　处：《重庆大学学报（自然科学版）》2010年第9期79-85,共7页Journal of Chongqing University

基　　金：国家自然科学基金委专项创新研究群体基金项目(50621403);重庆市杰出青年基金(CSCT;2009BA6047);新世纪优秀人才支持计划(NCET-06-07677)

摘　　要：硝基苯类化合物具有弱致突变性,且化学性能稳定,常规的废水处理方法很难使其净化。采用空化水射流结合Fenton处理硝基苯废水,研究了多种因素对硝基苯去除率的影响,通过对比分析得出,当硝基苯初始质量浓度为50mg/L,处理条件为Fe2+质量浓度40mg/L,H2O2质量浓度150mg/L,围压0.5MPa,pH值5.0,泵压10MPa时,硝基苯去除率达到95.06%;同时,通过高效液相色谱揭示了其降解机理:空化水射流促使Fenton释放出更多的HO·并加剧Fe2+的催化能力,将硝基苯直接降解或氧化,分解成链烃、有机酸等小分子有机物,并分析得出硝基苯降解中间产物为苯醌,4硝基酚,2硝基酚,对苯二酚等。Nitrobenzene compounds,featured with weak mutagenicity,chemical stability,are difficult to be purified by traditional degradation method.Several factors involved in the nitrobenzene wastewater degradation are comparatively analyzed by cavitating water jets assisted with Fenton.The removal ratio of nitrobenzene,whose concentration is 50 mg/L,reaches 95.06% when the Fe^2＋ concentration is 40 mg/L,the pH value,5.0,the hydrogen peroxide concentration,150 mg/L,the confining pressure,0.5 MPa,and the jetting pressure,10 MPa.The degradation mechanism,shown by high performance liquid chromatography（HPLC）,is that the cavitating water jet impelled the Fenton to release more HO· and enhances the catalytic capacity of Fe^2＋,then the nitrobenzene is degraded or oxidized totally,or graded into small organic molecules such as chain hydrocarbon and organic acids,etc.Besides,the intermediate products,including Benzoquinone,4-Nitrophenol,2-Nitrophenol and Hydroquinone,are also shown by HPLC.

关 键 词：硝基苯降解 空化水射流 羟基自由基 FENTON试剂 

分 类 号：X703[环境科学与工程—环境工程]