类光-芬顿体系PW_(11)O_(39)Fe(Ⅲ)(H_2O)^(4-)_H_2O_2可见光催化降解罗丹明B
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2020-04-16 15:14:15
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第55卷第4期中山大学学报(自然科学版)2016年7月ACTASCIENTIARUMNATURALIUMUNIVERSITATISSUNYATSENIV01.55No.4Ju1.2016DOI:10.13471/j.cnki.acta.snus.2016.04.014类光一芬顿体系PW11O39Fe(m)(H2O)/H202可见光催化降解罗丹明B陈艳,黎杜雷,杨金曼,高文凯,华英杰,王崇太(海南师范大学化工学院,海南海口571158)摘要:以Keggin型铁取代杂多阴离子PW。0,Fe(Ⅲ)(H0)一(PWFe)为可见光活性组分构建了一个类光一芬顿体系(PWFc/H:0),并用于模型污染物罗丹明B(RhB)的可见光催化降解,同时考察了H:0浓度、PW,。Fe浓度、RhB初始浓度及溶液pH值对RhB可见光催化降解速率的影响,讨论了RhB光催化降解的动力学性质。实验结果表明,当溶液pH=4.5时,由0.6mmol·L—PWI】Fe和4mmol·L~H2O构成的体系对RhB的光催化降解效果最佳,O.01mmol·L的RhB在250W金卤灯照射下反应60min,其降解率达到100%,反应240min,总有机碳(TOC)去除率约48%。羟基自由基猝灭和电子顺磁共振(EPR)实验表明,PWFe/H。O体系在可见光照射下产生羟基自由基,从而导致RhB的快速降解,降解反应的表观速率常数为(6.2±2)×10一mmol·L一·min一。关键词:Keggin型铁取代杂多阴离子;过氧化氢;罗丹明B;均相光催化;电子顺磁共振中图分类号:0643.3文献标志码:A文章编号:0529—6579(2016)04—0081—06VisiblephotocatalyticdegradationofrhodamineBbyaphotofenton-likesystemconsistingofPWl1o39Fe(111)(H2o)/H202CHENYan,LIDulei,YANGJinman,GAOWenkai,HUAVi~ie,WANGChongtai(SchoolofChemistryandChemicalEngineering,HainanNormalUniversity,Haikou571158,China)Abstract:Aphoto—Fenton—Likesystem(PW1lFe/H2O2)usingKeggin-typeFe(11)一substitutedhet—eropolyanionPW11O39Fe(11)(H2O)一(PWl1Fe)asthevisiblelightactivitycomponentwasstudied,whichwasemployedf0rthephotocatalyticdegradationofmodelpollutantrhodamineB(RhB)underanartificialVISirradiation.InfluencesoftheH202concentration,thePW11Feconcentration,theinitialRhBconcentrationandthesolutionpHonthephotocatalyticdegradationrateofRhBwasalsoexamined,togetherwithadiscussiononthekineticsofRhBdegradation.Theresultsshowedthatthedegradationra—tioof100%wasobtainedat60rainfor0.0lmmol·L~RhBwiththeoptimumconditionsofpH4.5.0.6mmol·L-1PW11Feand4mmol·L~H2O2undertheirradiationof250Wmetalhalidelamp.Thetotalorganiccarbon(TOC)removalwasabout48%at240min.Thehydroxylradicalquenchingande—lectronparamagneticresonance(EPR)experimentsrevealedthathydroxylradicalsgeneratedbyPW11Fe/H2O2systemundervisiblelightirradiationwerethemainreactiveoxygenspecies,resultingintherapiddegradationofRhB.TheapparentrateconstantofRhBdegradationwasestimatedtobe(6.2士2)10}收稿日期:2016—02—25基金项目:国家自然科学
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