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1、JournalofEnvironmentalSciences2010,22(10)1527–1533EnhancedozonationofdichloroaceticacidinaqueoussolutionusingnanometerZnOpowdersXuZhai1,ZhonglinChen1;,ShuqingZhao1;2,HeWang1,LeiYang11.StateKeyLaboratoryofUrbanWaterResourceandEnvironment,SchoolofMunicipalandEnvironmentalEngineering,HarbinInstituteo
2、fTechnology,Harbin150090,China.E-mail:xuzhai@yahoo.cn2.ForestryInstitute,NortheastForestryUniversity,Harbin150090,ChinaReceived10November2009;revised08February2010;accepted11February2010AbstractNanometerzincoxide(ZnO)powderswereusedasacatalysttoenhancetheozonationforthedegradationofdichloroaceticac
3、id(DCAA)inaqueoussolution.Thebatchexperimentswerecarriedouttoinvestigatetheeectsofkeyfactorssuchascatalystdosage,ozonedosage,solutionpHandtert-butylalcohol(t-BuOH)onthedegradationeciencyofDCAA.Densityfunctionaltheory(DFT)wasadoptedtoexplorethemechanismofgeneratinghydroxylradical(.OH)ontheZnOsurfac
4、e.TheresultsshowedthatadsorptionandozonationprocesseswerenoteectiveforDCAAremoval,andtheadditionofZnOcatalystimprovedthedegradationeciencyofDCAAduringozonation,whichcausedanincreaseof22.8%forDCAAdecompositioncomparedtothecaseofozonationaloneafter25min.Underthesameexperimentalconditions,theDCAAdeco
5、mpositionwasenhancedbyincreasingcatalystdosagefrom100to500mg/Landozonedosagefrom0.83to3.2mg/L.ThecatalyticozonationprocessismorepronouncedthantheozonationprocessaloneatpH3.93,6.88,and10.Withincreasingtheconcentrationoft-BuOHfrom10to200mg/L,thedegradationofDCAAwassignificantlyinhibitedintheprocessofc
6、atalyticozonation,indicatingthatZnOcatalyticozonationfollowed.OHreactionmechanism.BasedontheexperimentalresultsandDFTanalysis,itisdeducedthatthegenerationof.OHontheZnOsurfaceisascribedtotheadsorptionofmoleculeozonefollowedbytheinteractionofadsorbedozonewithactivesitesofthecatalystsurface.Itisalsoco
7、ncludedthatZnOmaybeaneectivecatalystforDCAAremoval,whichcouldpromotetheformationof.OHderivedfromthecatalyticdecompositionofozone.Keywords:dichloroaceticacid;catalyticozonation;densityfunctionaltheory;hydrox
