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当前位置:首页 > 行业资料 > 国内外标准规范 > TiO2CeSO42光省略化氧化体系光度法测定化学需氧量赵登山
DeterminationofchemicaloxygendemandbynanoTiO2-Ce(SO4)2coexistedphotocatalyticoxidationsystem-spectrophotometryZhaoDengshan,LiDenghao(DepartmentofBioengineeringandChemicalEngineering,HuaiyinInstituteofTechnology,Huaian223003,China)TiO2-CeSO42—,(,223003)[]TiO2Ce(),TiO2,Ce()TiO2,TiO2。Ce()ΔA,(COD)。,TiO24g/L、Ce()6mmol/L,45℃、pH1.210min,COD1.0~10mg/LCe()ΔA,:ΔA=0.0238COD+0.3072,R=0.9982,COD0.5mg/L。[];;;[]O0657.3[]B[]1005-829X(2008)12-0070-04Abstract:BasedontheprinciplethatnanoTiO2andCe()cooperateswithphotocatalyticoxidation,TiO2isusedasphotocatalyst,andCe()astheacceptorofthenanoTiO2photo-generatedelectronsforimprovingthephotocatalyticoxidationcapacityofnanoTiO2.ThroughthedeterminationoftheUVabsorbancechangingvalueΔA,thenanophotocatalysissystemfordeterminingchemicaloxygendemand(COD)hasbeenestablished.Theoptimizedoperationconditionsofthedeterminationareinvestigated.WhenthemassconcentrationofTiO2=4g/L,Ce()concentration=6mmol/L,reactiontemperature=45℃,thepHofthereactionliquid=1.2andreactiontime=10min,theCODisintherangeof1.0mg/Lto10mg/LandhasalinearrelationshipwithCe()absorbancechangingvalueΔA.ItscorrelationlinearequationisΔA=0.0238COD+0.3072,correlationcoefficientR=0.9982andthelowestdetectionlimitis0.5mg/L.Keywords:chemicaloxygendemand;nanotitaniumdioxide;cesiumsulfate;photocatalyticoxidation(COD)。COD〔1〕,,,、。,,、、、,。,,。,,,〔2~6〕。TiO2Ce(),Ce()COD。Ce()COD,COD1.0~10mg/LCe()ΔA,0.5mg/L,、、,COD。2812200812IndustrialWaterTreatmentVol.28No.12Dec.,20087011.1Spectrumlab22PC,;T5,11W,;GL-206-,;,。TiO2(,):≥34m2/g,≤50nm;:12mmol/L;(COD=100mg/L),。,。1.212mmol/L,0.2gTiO2,COD10mL,50mL,pH。10min,,10min,5mL,,320nm。CODCe()ΔA(ΔA=A0-A1,A0Ce(),A1Ce())。COD,Ce(),,COD。22.12.1.1Ce()Ce()3mmol/L,pH1.1,,1。1,Ce()330nm。,Ce(),Ce()260nm,Ce(),。,,330nmCe()。2.1.2pH=1.1,45℃COD5mmol/L,Ce(SO4)2-H2SO4、TiO2-H2SO4TiO2-Ce(SO4)2-H2SO4。2。2,Ce(SO4)2-H2SO410%,TiO2-H2SO460%,TiO2-Ce(SO4)2-H2SO4,TiO2Ce(SO4)2。Ce(SO4)2,TiO2,TiO2,TiO2。2,cab,。2.1.3TiO2,,。TiO2,(e-),(h+),/。HO·,HO·,R,〔7,8〕。(1)~(5):1.200.800.400200250300350400λ/nm1Ce()Ce()Ce()Ce()100806040200510152025/min/%a—Ce(SO4)2-H2SO4;b—TiO2-H2SO4;c—TiO2-Ce(SO4)2-H2SO42cba,:TiO2-Ce(SO4)2—2008-12,28(12)71TiO2+hυ→h++e-(1)h++H2O→HO·+H+(2)HO·+R→…→CO2+H2O(3)h++R→…→CO2+H2O(4)h++e-→hυ(5)Ce(),Ce()(6):Ce4++e-→Ce3+(6)Ce(),,TiO2。,CODCe()△A。2.2-pH(A)、TiO2(B)、(C)、(D)、(E)。54,。1。1,5,pHCe(),,。,pH1.5,,,pH。pH=1.2。,40℃,,45~60℃,,,。TiO24g/L、Ce()6mmol/L、45℃、pH1.210min。2.32.3.1,CODCe()△A,Ce()△ACOD1.0~10mg/L,△A=0.0238COD+0.3072,R=0.9984。0.5mg/L。2.3.2COD。,。Cl-,。5.00mg/LCODCl-2。2,Cl-≤800mg/L,。2.4,,,COD10mg/L,。3。3,COD,。[][1]《》.1AB/(g·L-1)C/(mmol·L-1)D/℃E/min△A11.513.04510.90321.524.55051.10431.536.055101.55841.547.560151.53751.214.555151.09661.223.060100.96271.237.54551.47981.246.05011.30390.916.06051.035100.927.55510.933110.933.050150.959120.944.545101.159130.617.550100.852140.626.045150.922150.634.56010.576160.643.05550.691K15.1023.8863.5154.4633.715K24.8403.9213.9354.2184.309K34.0864.5724.8184.2784.531K43.0414.6904.8014.1104.514R2.0610.8041.2860.3530.8162Cl-CODCl-/(mg·L-1)02004006008001000COD/(mg·L-1)5.005.005.014.954.914.73/%———-1.0-1.8-5.42008-12,28(12)3COD/(mg·L-1)/(mg·L-1)RSD/%/(mg·L-1)15.1214.552.935.005.215.512.865.0013.2613.843.245.00/(mg·L-1)/%19.72103.410.3296.218.96102.4:n=7。72[M].:,1990:235.[2].TiO2-KMnO4—[J].,2007,26(9):116-119.[3],,,.[J].,2004,25(5):823-826.[4]FanC,XueP,SunY.Preparationofnano-TiO2dopedwithceriumanditsphotocatalyticactivity[J].JournalofRareEarths,2006,24(3):309-313.[5],,,.[J].,2005,63(2):148-152.[6],,,.(COD)[J].(),2003,26(6):649-651.[7],,,.Fe()TiO2X3B[J].,2004,62(16):1455-1459.[8],,,.TiO2[J].,2006,25(6):604-607.1,2,1,2,2,2(1.,150001;2.,132012)[]TritonX-100,Hg2+,、Hg2+———。pH2Hg2+,λmax=495nm,5~60μg/L,Hg2+,0.9995,ε=4.7×104L/(mol·cm)。()。1μg/L,。[];;;;[]O657.3[]A[]1005-829X(2008)12-0073-04StudyonthedirectdeterminationoftracemercuryinaqueoussolutionbyspectrophotometrySunXuhui1,2,MaJun1,LiXiaohua2,WangXiaoyu2,ZhangJing2(1.SchoolofMunicipalandEnvironmentalEngineering,HarbinInstituteofTechnology,Harbin150001,China;2.ChemicalEngineeringCollege,NortheastElectricPowerUniversity,Jilin132012,China)Abstract:InthepresenceofsurfaceactiveagentTritonX-100andethonal,andbasedonthechromogenicreactionbetweendithizoneandHg2+inwater,aneasyandenvironmentalfriendlyanalyticalmethodhasbeensetupforthedirectdeterminationoftheconcentrationoftracemercuryinaqueousphase.UndertheconditionofpH2,Hg2+inwaterreactwiththesystemtodevelopacoloredcomplex.Itsλmax=495nm,andintherangeof5-60μg/L,theabsorbancehasalinearrelationshipwiththeconcentrationofHg2+andtherelativecoefficientis0.9995,whileε=4.7×104L/(mol·cm).Itsrelativestandarddeviationandrelativeerrorarealllessthanthosebyithizoneextractionphotometry(nationalstandardmethod).Afterbeingenrichedwithactivecarbonpowder,thedetectionofitsminimumlimitcanbelowerthan1μg/L.Cu2+interferenceexistsinthereaction.Keywords:dithizone;polyoxyethyleneoctyphenylether;ethanol;mercury;spectrophotometry,,。,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,2812200812IndustrialWaterTreatmentVol.28No.12Dec.,2008[](1965—),2006,,,。:15950388097,E-
本文标题:TiO2CeSO42光省略化氧化体系光度法测定化学需氧量赵登山
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