Fe3掺杂TiO2光催化剂处理造纸废水的研究

[]　2006-07-21[]　([2000]66);(20040284);(20063202).[]　(1968—),,;:(1967—),,,,.[]1000-1832(2006)04-0095-05Fe3+TiO2石中亮1,宁　波2,王传胜1,姚淑华1(1.沈阳化工学院应用化学系,辽宁沈阳110142;2.长春职业技术学院,吉林长春130033)[　]　利用TiCl4在无水乙醇中水解,制备了纳米TiO2和Fe3+掺杂的光催化剂,通过XRD和TEM对产物的晶体结构、晶粒大小、形貌进行了表征,讨论了Fe3+掺杂浓度、焙烧温度、焙烧时间、催化剂用量、溶液的pH值和光照时间等对TiO2光催化剂处理造纸废水的影响.结果表明:掺杂Fe3+的TiO2光催化剂氧化性能有所提高,在掺杂量为1.25%(质量分数),焙烧温度为500℃、焙烧时间3h时,光催化活性最高;溶液pH值为4.0,催化剂用量为2.5g/L,光照时间4h时TiO2降解造纸废水的能力最强.[]　TiO2;掺杂;Fe3+;光催化氧化;造纸废水[]　X703　　　[]　610·30　　　　[]　A0　21,、.20001428m3,,[1].,,,.、,,,.,.(SS)、,(COD)、,90%..,TiO2[2-5].TiO2,TiO2:(1)3.2eV,387.5nm,,5%,;(2),.,TiO2,.,TiO2[6-7].TiCl4,Fe3+Fe3+/TiO2,第38卷第4期东北师大学报(自然科学版)Vol.38No.42006年12月JournalofNortheastNormalUniversity(NaturalScienceEdition)December2006DOI:10.16163/j.cnki.22-1123/n.2006.04.021,.1　1.1　:(,);(,),(,),(,).:();pHS-2();78-3();().1.2　,TiCl4,,,,120℃,,TiO2.1h,Fe3+TiO2.1.3　RigakuD/max-rBX(CuKa)X(XRD);JE-OLJSM-6360LV(SEM).1.4　,300W,,,pH,15min,5min,.,[8]COD,.2　2.1　XRDSEMa:TiO2(350℃);b:TiO2(500℃);c:Fe3+/TiO2(500℃);1　XRDXRD1,1a,350℃.,,,,1b,500℃TiO2,1c,,TiO2500℃,.,Fe3+,TiO2X,TiO2,TiO,,.350℃500℃Fe3+/TiO22.2a,,,,80nm.,,.2.2　Fe3+/TiO22.2.1　光催化降解造纸废水的机理TiO23.2eV,—,—e-cd,h+vb:TiO2+hν※e-cd+h+νb;96东北师大学报(自然科学版)第38卷H2O+h+νb※OH·+H+;OH-+h+νb※OH·;h+νb+Red※Red+.OH·,,,CO2H2O.a:350℃;b:500℃2　Fe3+/TiO2SEM2.2.2　焙烧温度的影响Fe3+TiO23h,3.3500℃,COD,..2.2.3　焙烧时间的影响TiO2500℃,4.4,500℃3h,COD,,3h,COD,3h.　　　　3　COD　　　　　　　　　4　COD2.2.4　Fe3+掺杂量的影响,Fe3+,COD,5.5,Fe3+COD,,COD,Fe3+1.25%,COD.,,,-,97第4期石中亮,等:Fe3+掺杂TiO2光催化剂处理造纸废水的研究;,,,TiO2,TiO2,,Fe3+1.25%,.2.2.5　催化剂用量的影响,4h,COD6.6,,COD,,OH·,.2.5g/L(TiO2),COD.,,,.,2.5g/L.　　　　　5　Fe3+COD　　　　　　　　6　COD2.2.6　pH值的影响pHCOD,H2SO4NaOHpH4h,COD7.7:CODpH,pH4COD,pHCOD,TiO2pH,-pH,pH.pH4.0.　　　　　　　　7　pHCOD　　　　　　　　　8　COD2.2.7　光照时间的影响,pH4.0,1.25g/L,COD,8.8,COD,,,,4h,COD,4h.98东北师大学报(自然科学版)第38卷3　Fe3+TiO2,1.25%,500℃,3h,Fe3+/TiO22.5g/L,pH=4.0,300W4h,COD80%.[　　　][1]　,.TiO2[J].,2000,32(5):40-42.[2]　,,,.TiO2[J].,2004,20(2):138-143.[3]　VERONICAVAMATHEVAN,HELENTSE,ROSEAMAL,etal.EffectsofFe3+andAg+ionsonthephotocatalyticdegradationofsucroseinwater[J].CatalysisToday,2001,68(1-3):201-208.[4]　NAVIOJA,TETAJJ,DJEDJEIANP,etal.Irondopedtitantiapowderspreparedbyasol-gelmethod.partⅡ:photocatalyticprop-erties[J].ApplCatalA,1999,178(2):191-203.[5]　HagfeldtA,GratzelM.Light-inducedredoxreactionsinnanocrystallinesystems[J].ChemRev,1995,95(1):49-68.[6]　ROSANAMA,WILSONFJ.PhotocatalysisdestructionofVOCsinthegas-phaseusingtitaniumdioxide[J].ApplCatalBEnviron,1997,14:55-68.[7]　HIROSHIY,TSUKASAT.Titaniumdioxide/adsorbenthybridphotocatalystsoforganicsubstancesofdiluteconcentration[J].CatalToday,2000,32(1):1-21.[8]　,,,.MnSO4COD[J].,2003,21(5),54-56.　StudyontreatmentofpapermakingwastewaterwithFe3+dopedTiO2photocatalysisSHIZhong-liang1,NINGBo2,WANGChuan-sheng1,YAOShu-hua1(1.DepartmentofAppliedChemistry,ShenyangInstituteofChemicalTechnology,Shenyang110142,China;2.TheChangchunVocationalInstituteTechnology,Changchun130033,China)Abstract:PureandFe3+dopedTiO2nanoparticleswerepreparedbyTiCl4hydrolysisprocessinabsoluteal-cohol,andwerecharacterizedbymeansofXRDandTEM.Theeffectsaremainlyinvestigatedaboutcalcin-ingtemperatureandtime,catalystamount,pHvalue,radianttimeonpapermakingwastewaterdegradation.TheexperimentalresultsshowedthatFe3+dopantpromotedTiO2phasetransformation,andincreasedthephotocatalyticoxidationofTiO2nanoparticles.Moreover,intheexperimentofphotocatalyticdegradationpapermakingwastewater,Fe3+dopedTiO2nanoparticleofFedopingcontent1.25%(massfraction).cal-cinedat500℃for3hexhibitedahigherphotocatalyticactivity,andtheadequatereactionconditionswerefoundasfollowing:quantityofcatalystreached2.5g/L(TiO2),thepHvaluewas4.0,andtheradianttimewas4h.Attheoptimalcondition,theremovalrateofpapermakingwastewaterisover80%.Keywords:TiO2;doping;Fe3+;photocatalyticoxidation;papermakingwastewater(:)99第4期石中亮,等:Fe3+掺杂TiO2光催化剂处理造纸废水的研究