类芬顿试剂液相氧化法脱硝的实验研究
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2020-04-16 15:14:14
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中阁环境科学2012,32(6):988-993ChinaEnvironmentalScience类芬顿试剂液相氧化法脱硝的实验研究范春贞,李彩亭,路培,张星,赵伟伟,陶沙沙(1.、湖南大学环境科学与工程学院’湖南长沙410082;2湖南大学环境生物与控制教育部重点实验室,湖南长沙410082)摘要:以类芬顿i~J(H2O2/Fe/tr~)液相氧化法脱硝,探讨了液相催化和类芬顿脱硝反应的机理及其关系.研究了H202浓度、[H202]/[Fe】、初始pH值、气体流量、紫外光和H2O2投加方式对NO去除率的影响.结果表明,脱硝效率随H202浓度增加而升高;H202浓度一定时,Fe浓度的增加有利于NO的脱除,[H202]/[Fe]=6时,脱硝效率最高;当初始pH值<3时,脱硝效率随pH值的升高而升高,当初始pH值>3时,pH值升高,脱硝效率下降,初始pH值为3时脱硝效果最好;NO去除率随气体流量的增加而下降;紫外光的照射能提高脱硝效率;分3次等量投加H1O2可以使脱硝效率维持在80%左右.关键词:类芬顿试剂;氧化;液相催化;脱硝中图分类号:X703文献标识码:A文章编号:1000—6923(2012)06—0988—06ExperimentalresearchofpurificationNO-containinggasbyaqueousoxidationwithFenton—likeagent.FANChun—zhen,LICai-ring’,LUPei,ZHANGXing,ZHAOWei—wei,TAOSha—sha(1.CollegeofEnvironmentalScienceandEngineering,HunanUniversity,Changsha410082,China;2.KeyLaboratoryofEnvironmentalBiologyandPollutionControl,MinistryofEducation,HunanUniversityChangsha410082,China).ChinaEnvironmentalScience,2012,32(6):988~993Abstract:Thefenton·likeagent(H202/Fe”/UV1liquid-phaseoxidationmethodwasusedtopurifytheNO—containinggas.Themechanismofaqueouscatalyticoxidationandfenton—likereactionindenitriflcationandtheirrelationshipwerestudiedbyinvestigatingtheinfluenceofdiferentoperationparameterssuchasH202concentration,【H202]/[Fe”】,initialpHvalue,gasflow,ultravioletrays(uV)andaddingH202ontheNOremovaleficiency.TheresultsshowedthattheeficiencywasimprovedwiththeincreaseofH202concentration,andthebesteficiencycouldbeachievedwhen[H2O2]/[Fe”】=6.Furthermore,whentheinitialpHvaluewaslessthan3,theNOremovaleficiencywouldincreaseduetotheenhancementofpHvalue,whileonthecontrarywheninitialpH>3,andthebesteficiencycouldbereachedattheinitialpHvalueat3.Besides,otherprocessingactivitiessuchasemployingtheUVordecreasingthefluegasmassflowratecouldalsoraisetheeficiency.Theexperimentindicatedthattheeficiencycouldbemaintainedatabout80%ifaddingH202forthreetimes.Keywords:fenton—likeagent;oxidation;liquidphasecatalytic;denitrification大气中的氮氧化物(NO)是引发光化学烟雾和酸雨等环境问题的主要原因,为治理其带来的污染,需要开发经济、高效、清洁且易于操作的脱硝技术.类Fenton试剂催化氧化法作为一种高级氧化技术,具有氧化能力强、
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