CdSTiO2光催化去除水体中氨氮的研究

研究论文CdS/TiO2陈晓慧1,柳丽芬1,2,杨凤林1,张兴文1,余济美3(1.,116023;2.,116023;3.,):利用溶胶-凝胶法制备了不同比率的CdS掺杂TiO2复合纳米颗粒催化剂,并用其进行了紫外光日光灯和太阳光全波长光催化去除水中氨氮和其它形式无机氮的对比实验研究.考察了添加催化剂的量CdS复合比率有氧化态氮亚硝酸根或硝酸根与氨氮共存时光催化脱氮的耦合效果外加光源等对脱除氨氮效率的影响,并研究了后3个因素对CdS光腐蚀程度的影响.对于氨氮初始质量浓度为50mg/L的模拟废水,在通空气搅拌条件下,n(CdS)Bn(TiO2)=0.17的CdS/TiO2催化剂脱氮效果最佳,此时经紫外光照2h后脱除氨氮效率达41.5%.实验结果表明:复合催化剂中CdS的含量是影响光催化活性和光腐蚀程度的重要因素.:溶胶-凝胶法;氨氮;二氧化钛;硫化镉;光腐蚀:1000-3231(2007)02-0089-13:O64:ATiO2[1],,.TiO2,e-,h+.[2-4].,,,.(WHO)1.5mg/L[5,6].,,Lee[5];[7]TiO2+;Zhu[6]pH.:2006-09-15;:2006-11-14.:(20477006).:(1983-),,,;,,E-mail:[e-mail],:0411-84706173,:403,:116023.89252Vol.25No.220073PhotographicScienceandPhotochemistryMar.,2007TiO2,5%,,[8].:[8,9].,,:TiO2[10];,[11],pH[12],[12].,,,,CdSCdSePbSFe2O3TiO2,,,[3,13].CdS,TiO2(1,2)[14],,,,1[14]Energybandgraphofsemiconductor2CdSTiO2[14]EnergybandgraphofCdSandTiO2CdS,TiO2,,TiO2.CdS,,TiO2[3,5,14].Fujii-CdS-TiO2,Pt,450nm,7000min,HCdS7,CdS,.TiO2CdS[13].Wu[15]CdS-TiO2,CdSTiO2CdS.CdS.,,-.-CdSTiO2,9025,,.11.1,;.722E();752-();101-1A();LG6-1-1();JB-2().,(20W,254nm)([11W,).,,6cm.(50mg/L100mL,100mL/min,,.,pH9.0)10.2).722E.,K=420nm;N-(1-)-,K=540nm;,752,K=220nm275nm,3.,K=420nm[16].1.2CdS/TiO2TiO2,,[14],:TiO2:50mL50mL,,20min,,60min,.CdS:1mmol10mL10mL,115mmol10mL,30min.S,CdS.CdS/TiO2:CdS20mLTiO2,,,(0.22Lm),,CdSTiO2.2:CdS/TiO291CdS/TiO2:80e,,105e.,500e1h,N2.,320,5CdSTiO2,A[n(CdS)Bn(TiO2)=0.034B1],B[n(CdS)Bn(TiO2)=0.068B1],C[n(CdS)Bn(TiO2)=0.17B1],D[n(CdS)Bn(TiO2)=0.34B1]E[n(CdS)Bn(TiO2)=0.68B1].TiO2:80eTiO2,105e,1h,,320.F.1.3:D/MAX-2400X(Cu,KA);Tecnai20;UV-550;SRS-3400X.22.12.1.1X(XRD)XRDBCD,3.3BCDXRDXRDpatternofthecatalystsB,C,D3,TiO2,(101)(004)(200)(211);CdS,(111)(220).ScherrerD=0.89K/BcosH[XK0.15406nm;H(b)][17],CdS/TiO2B,C,DCdS4.9nm)13.4nm,TiO27.0nm)12.3nm,C9225.XRD,.2.1.2(TEM)4CTEMTEMimagesofthecatalystC4,5nm)30nm,XRD,CdSTiO2,TiO2,.,,,.2.1.3(UV-Vis)5,CdSTiO2,,.,500)600nm[4],800nm.2.1.4X(XRF)XRD,CdTi.,.2.2C,50mg/L100mL,0.5g/L1.5g/L.2:CdS/TiO2935BCDFUV-VisUV-VisspectraofthecatalystsB,C,D,andF,2h,.67.6CInfluenceofthecatalystCquantityontheremovalofammonianitrogen7CNO2--NformedinsolutionusingdifferentamountofphotocatalystC6,7,1g/L,,.,,,.1g/L.2.3CdSABCDEF(TiO2)CdS.50mg/L100mL,100mL/min,,.,pH9.0)10.2,.8,9.94258,n(CdS)Bn(TiO2)0.0340.68,,n(CdS)Bn(TiO2)=0.17(C),,.C.8NH4-NremovalusingdifferentcatalystsunderUV9NO2--NformationusingdifferentcatalystsunderUV,CdSCdSCd2+SO42-[6],810,CdS0.5h,0.5h,.10CdSPhotocorrosionratioofCdSindifferentcatalystsTiO2CdS.CdS68%TiO2,CdS,TiO2,CdS,TiO2,.[18],CdS,,,CdSCdS.[17]P25,,,.2.4/2.4.12:CdS/TiO295C11W()(),50mg/L100mL,11,12,,pH9.0)10.2,.11Removalofammonianitrogenusingdifferentlightsources122h2hremovalofammonianitrogenusingdifferentlightsources1112,-,.20W11W.,(2h0.9mg/L),.,0.5h,1.5h,.2.4.2,3.,.,C,25mg/L,.,,pH9.0)10.0,2h.13,,,1B1,32.7%,11.8%,2212%,(2h1.4mg/L).14,,2B1,,26.3%,96255411%,,(2h2.4mg/L),40.1%.13Influenceofratioofnitritetoammoniumontheremovalofnitrogen14InfluenceofratioofammoniumtonitrateontheremovalofnitrogenC,25mg/L,(2B1),(1B1).,-,,.2.5/CdS,,.50mg/L,C2h,,15,16,C,,,,,.15,,,,,,2h(0.9mg/L1.6mg/L),(1.9mg/L).16,CCdS.,,CdS.,,.,2:CdS/TiO297,.,,S2-SO42-,.,15/Removalofnitrogenindifferentsolutionsunderirradiation16/CdSPhotocorrosionratioofCdSindifferentsolutionsunderUV/VisirradiationCdS,[19]:4NO3-+CdS4NO2-+SO42-+Cd2+(1)NO3-+CdS+2H2ONH3+SO42-+Cd2++OH-(2)17Reductionofammonianitrogenwithotherphotocatalystundersolarlight,(),,.Guan[3]CdS,Na2SH3PO2,CdS,Sato[19]H2Ti4O9/CdSNO3-,NO3-CdS,Pt.,()CdS,.2.6,:,85mg/L,C[11]Ag(1.0%)/TiO298252h,[10],17.17,CdS/TiO2,2h41.2%,[10](46.0%),[11]Ag(1.0%)TiO2(24.1%).N,CdS0.5h,1.5h,.31.-CdS/TiO2.X(XRD)(TEM)-(UV-Vis),TiO2,CdS.CdS/TiO2CdS4.9)13.4nm,TiO27.0)12.3nm.,800nm.n(CdS)Bn(TiO2)0.17.2.CdSTiO2;CdS,;n(CdS)Bn(TiO2)0.17.,50mg/L2h,41.5%,,1mg/L,.3.,.2h,41.5%38.8%35.7%.,,.,.4./:25mg/L,1B1,,22.2%;,2B1,,26.3%,54.1%,40.1%,,.5.,,C2h,,.CdS,CdS,,Na2SH3PO2.6.,,85mg/Ln(CdS)Bn(TiO2)=0.172h,41.2%.2:CdS/TiO299:[1]FujishimaA,HondaK.Electrochemicalphotolysisofwateratasemiconductorelectrode[J].Nature,1972,238:37-38.[2],,,.[J].,2004,33(1):40-42.CaoGX,LiuZH,LiGL,etal.StudyonthetreatmentofcontentofNO2-inwastewaterthroughphotocatalysismechanismofnanometertitaniumdioxide[J].AppliedChemicalIndustry,2004,33(1):40-42.[3]GuanGQ,KidaT,KusakabeK,etal.PhotocatalyticactivityofCdSnanoparticlesincorporatedintitaniumsilicatemolecularsievesofETS-4andETS-10[J].AppliedCatalysisA:General,2005,295:71-78.[4]BessekhouadY,RobertD,WeberJV.Bi2S3/TiO2andCdS/TiO2heterojunctionsasanavailableconfigurationforphotocatalyticdegradationoforganicpollutant[J].JournalofPhotochemistryandPhotobiologyA:Chemistry,2004,163:569-580.[5]LeeJ,ParkH,ChoiW.SelectivephotocatalyticoxidationofNH3toN2onplatinizedTiO2inwater[J].Environ.Sci.Technol.,2002,36:5462-5468.[6]ZhuXD,CastleberrySR,NannyMA,etal.EffectsofpHandcatalystconcentrationonphotocatalyticoxidationofaqueousammoniaandnitriteintitaniumdioxidesuspensions[J].Environ.Sci.Technol.,2005,39:3784-3791.[7],,,.[J].,2005,18(3):43-45.QiaoSJ,ZhaoAP,XuXL,etal.StudyonammonianitrogeninwastewaterdegradationbyTiO2photocatalysis[J].