TiPbO2电极在测定COD中的应用谢天

361四川大学学报(工程科学版)Vol.36No.120041JOURNALOFSICHUANUNIVERSITY(ENGINEERINGSCIENCEEDITION)Jan.2004:1009-3087(2004)01-0037-04Ti/PbO2COD谢　天,旦德忠,王　斌(,610065)　:Ti/PbO2,COD,,COD。1.8V、0.03mol/L、2.5min;0.2mol/L、2min;COD50～350mg/L。,COD。COD。:PbO2;COD;:X832:AFastDeterminationofCODwithTi/PbO2ElectrodeXIETian,DANDe-zhong,WANGBin(SchoolofEnivronmentSci.andEng.,SichuanUniv.,Chengdu610065,China)Abstract:Theconventionalmethodforchemicaloxygendemand(COD)measurementneedsalongtimeandcannotmeetthedemandfortheonlinetest.Inthepaper,athree-electrodesystemwithTi/PbO2asworkinganodewaspreparedforthefastdeterminationofCOD.Bymeasuringthecurrentchangeontheanodeinastandardsolutionwithdifferentcon-tentsofglucoseunderaconstantelectrolyticvoltage,theCODvaluescanbecorrespondinglydetermined.Throughthetest,theoptimizedworkingconditionsweredetermined:workingvoltageis1.8V,electrolyteconcentrationis0.03mol/L,anddeterminationtimeis2.5min,theoptimumrebirthconditionis:rebirthsolutionconcentrationis0.2mol/Landrebirthtimeis2min;theoptimumCODdeterminationrangeis50～350mg/LunderwhichtheCODvaluescanbecorre-latedwiththecurrentchangeinalinearrelationship.Keywords:leaddioxideelectrode;CODmeasurement;constantvoltageelectrolysis　　COD,,,。,,TiPbO2COD,COD,,,,,。:2003-03-21:　(1978-),,.:.PbO2,,(·OH),,Comninel-lis[1](1)(2):PbO2+H2OPbO2[·OH]+H++e-(1)R+PbO2[·OH]2CO2+PbO2+2H++2e-(2),R。,。,DOI:10.15961/j.jsuese.2004.01.010。COD,,-COD,。。1　1.1　PbO2[2],β-PbO2。Pb(NO3)2·3H2O30g/L()。,、30mA/cm2、65℃pH=3,2h。PbO2,0.1mm。1.2　,;,;,;GMBP-1,;UT60E,;HW78-1,。1.3　:1.0321g,1L,COD1000mg/L。:100℃,2h,,0.8504g,1L,COD1000mg/L。:4.26gNa2SO41,0.03mol/L。:28.42gNa2SO41,0.2mol/L。2　2.1　2.1.1　工作电压的确定50ml,1L,COD50mg/L,80ml,20ml0.03mol/LNa2SO4,,0～2.4V。,0～1.2V,,1.4V,,2.2V,,。,,,1.4～2.0V:Na2SO40.03mol/L,1.4、1.6、1.82.0V,COD50～300mg/L,,R,1。11.8V,COD,1.8V。1　Tab.1　Influenceofworkingvoltageoncurrentchangevalue/V1.41.61.82.0R0.771740.91520.961490.896762.1.2　电解液浓度的确定1.8V,Na2SO4。Na2SO40.02、0.03、0.04、0.05、0.060.1mol/L,COD50～300mg/L,,R,2。2　Tab.2　InfluenceofelectrolyteconcentrationoncurrentchangevalueNa2SO4/(mol·L-1)0.020.030.040.050.060.1R0.871920.993830.905590.612590.841280.57991　　Na2SO4,,,Na2SO40.03mol/L,COD,,Na2SO40.03mol/L。2.1.3　测定时间的确定1.8V,Na2SO40.03mol/L,,1。1,1min,,,,,[3],,,,。2.5min。38()361　Fig.1　plotofdeterminationtimevscurrent2.2　(1)(2),PbO2(PbO2[·OH]),,,,:PbO2[·OH]1/2O2+H++e-+PbO2(3)2.2.1　再生液浓度的确定1.8V,Na2SO40.03mol/L,2.5min,Na2SO4,,。3,Na2SO40.2mol/L,,。0.2mol/L。3　Tab.3　Theinfluenceofelectrolyteonrebornoftheanode/(mol·L-1)0.020.040.060.080.10.20.32.2.2　再生时间的确定1.8V,Na2SO40.03mol/L,2.5min,,,,,1.0、1.5、2.0min,,R,4。,,,。,,。4,2min,,2min。4　Tab.4　Influenceofreborntimeoncurrentchangevalue/min1.01.52.0R0.827220.980430.997892.2.3　最佳COD测定范围的确定,COD。1.8V,0.03mg/L,,2.5min,,0.2mol/L,2min,,COD,2。2　CODFig.2　PlotofCODvscurrentchangevalue2,COD50～350mg/L,COD。,:1.8V,0.03mol/L,,2.5min,。,,0.2mol/L,2min。COD50～350mg/L,,。2.2.3　标准工作曲线的绘制COD50～300mg/L,COD,3。y=2.6503x+349.26,R=0.99481。2.3　,COD50～350mg/L,COD,4。391　,:Ti/PbO2COD3　Fig.3　Standardworkingcurve4　Fig.4　Comparisioncurveofptassiumacidphyhalatestan-dardsolutiony=2.92873x+355.22,R=0.99159,,R0.99,,,α=0.05,F=0.7474F0.05(1,12)=4.75,COD,。,COD,。3　　1)Ti/PbO2,Pt,,COD,CODCOD,COD。,,;2)COD,,,,。COD,COD。:[1]ComninellisC,PulgarinC.Anodicoxidationofphenolforwastewatertreatment[J].JApplElectrochem,1991,21(10):703～705.[2],,,.[P].CN87106028.[3].[M].3.:,2002.143～146.(　)40()36