Fenton试剂氧化对硝基酚中氧化还原电位的变化规律  

Variation of ORP during p-nitrophenol degradation by Fenton oxidation process

作　　者：赵云[1,2,3] 王丽萍[1,2] 何士龙[1,2,3] 侯梅锋[1,2] 陈雪梅[1,2] 张莉[1,2] 

机构地区：[1]中国矿业大学环境与测绘学院,江苏徐州221008 [2]江苏省资源环境信息工程重点实验室,江苏徐州221008 [3]中国科学院生态环境研究中心,环境水质学国家重点实验室,北京100085

出　　处：《环境污染与防治》2011年第4期58-61,65,共5页Environmental Pollution & Control

基　　金：中国矿业大学青年基金资助项目(No.2008A031)

摘　　要：考察了Fenton试剂氧化对硝基苯酚(PNP)过程中氧化还原电位(ORP)的变化规律。结果表明:(1)当pH为3、H2O2投加量为3 mmol/L、Fe2+投加量为0.3 mmol/L时,废水中PNP在5.0 min时降到5 mg/L左右,去除率达95%;废水可生化性得到有效改善(BOD5/COD由最初的0.073升至0.390)。(2)ORP反应了整个Fenton体系中的氧化还原状态,而整个体系中主要的氧化还原物质是Fe2+、·OH、H2O2、Fe3+以及氢醌等,ORP变化规律直接反映了哪种氧化还原物质的变化尚未明确,需进一步验证。(3)ORP的变化直接反映了Fe2+/Fe3+的形态变化。(4)利用ORP的变化可以反映Fenton试剂降解有机物的起始、快速降解及降解结束的稳定阶段。Degradation of p-nitrophenol（PNP） in aqueous medium by Fenton reagent was conducted to monitor the variation of oxidation-reduction potential（ORP） during Fenton oxidation process.Results showed that under the condition of initial pH value was 3,H2O2 dosage was 3 mmol/L and Fe2＋ dosage was 0.3 mmol/L,PNP could decreased to 5 mg/L in 5.0 min,giving the removal rate of 95%.The biodegradability of wastewater was greatly improved for the BOD5/COD value increased from 0.073 to 0.390.ORP could reflect the oxidative redox status of Fenton system perfectly;Fe2＋,·OH,H2O2,Fe3＋ and hydroquinone were main oxidation-reduction materials,but which one could be reflect by ORP need further verification.ORP was distinctly corresponded with Fe2＋/Fe3＋,it was also found to be an effective indicator to monitor the beginning,quick reaction and ending of p-nitrophenol degradation by Fenton oxidation process.

关 键 词：FENTON试剂 对硝基苯酚 氢醌 氧化还原电位 

分 类 号：X703[环境科学与工程—环境工程]