紫外_TiO2_芬顿复合工艺增强在近中性pH值下对布洛芬的降解能力

ChineseJournalofCatalysis39(2018)701–709催化学报2018年第39卷第4期|www.cjcatal.orgavailableatwww.sciencedirect.comjournalhomepage:www.elsevier.com/locate/chnjcArticle(SpecialIssueonEnvironmentalandEnergyCatalysis)EnhancementofUV‐assistedTiO2degradationofibuprofenusingFentonhybridprocessatcircumneutralpHMeijuanChena,b,WeiChub,*,JingziBeiyuanb,c,YuHuangd,eaSchoolofHumanSettlementsandCivilEngineering,Xi’anJiaotongUniversity,Xi’an710049,Shaanxi,ChinabDepartmentofCivilandEnvironmentalEngineering,TheHongKongPolytechnicUniversity,HongKong,ChinacCentreofSustainableDesignandEnvironment,FacultyofDesignandEnvironment,TechnologicalandHigherEducationInstituteofHongKong,HongKong,ChinadKeyLabofAerosolChemistry&Physics,InstituteofEarthEnvironment,ChineseAcademyofSciences,Xi’an710061,Shaanxi,ChinaeStateKeyLabofLoessandQuaternaryGeology(SKLLQG),InstituteofEarthEnvironment,ChineseAcademyofSciences,Xi’an710061,Shaanxi,ChinaARTICLEINFOABSTRACTArticlehistory:Received28October2017Accepted13December2017Published5April2018AsynergisticUV/TiO2/Fenton(PCF)processisinvestigatedforthedegradationofibuprofen(IBP)atcircumneutralpH.TheIBPdecayinthePCFprocessismuchfasterthanthatwiththeconvention‐alUV,UV/H2O2,Fenton,photo‐Fenton,andphotocatalysisprocesses.ThekineticsanalysisshowedthattheIBPdecayfollowsatwo‐stagepseudo‐firstorderprofile,thatis,afastIBPdecay(k1)fol‐lowedbyaslowdecay(k2).Theeffectsofvariousparameters,includinginitialpHlevel,dosageofFenton’sreagentandTiO2,wavelengthofUVirradiation,andinitialIBPconcentration,areevaluat‐ed.TheoptimumpHlevel,[Fe2+]0,[Fe2+]0/[H2O2]0molarratio,and[TiO2]0aredeterminedtobeapproximately4.22,0.20mmol/L,1/40,and1.0g/L,respectively.TheIBPdecayatcircumneutralpH(i.e.,6.0–8.0forwastewater)showsthesameIBPdecayefficiencyasthatattheoptimumpHof4.22after30min,whichsuggeststhatthePCFprocessisapplicableforthetreatmentofwastewaterinthecircumneutralpHrange.Thelnk1andlnk2areobservedtobelinearlycorrelatedto1/pH0,[IBP]0,[H2O2]0,[H2O2]0/[Fe2+]0andln[TiO2]0.Mathematicalmodelsarethereforederiv