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1、物理化学学报(WuliHuaxueXuebao)MarchActaPhys.鄄Chim.Sin.,2008,24(3)：533-538533[Note]www.whxb.pku.edu.cn活性炭孔结构对TiO2/AC复合光催化剂光催化活性的影响*刘守新陈孝云(东北林业大学生物质材料教育部重点实验室,哈尔滨150040)摘要：以4种表面化学性质相近,而孔结构差异较大的活性炭(AC)为原料,采用酸催化水解法合成了系列TiO2/AC复合催化剂,考查活性炭孔结构对复合光催化剂活性的影响.以苯酚为模型物,考察了催化剂的活性；以
2、低温(77K)液氮吸附测定活性炭的比表面积、孔容和孔径分布；以Boehm滴定及元素分析定量表征活性炭表面化学性质.以SEM观测复合催化剂表面TiO2的分散性能；以X射线衍射(XRD)、漫反射光谱(DRS)测试光催化剂晶相结构参数及光吸收阈值.结果表明,活性炭孔结构性质对TiO2/AC活性影响显著.AC1、AC2、AC3、AC4对TiO2活性提高的协同系数分别为1.55、2.03、1.28、1.43.协同系数大小与接触界面面积变化值(驻S)趋势相似.具有发达的微孔及适量中孔结构的TiO2/AC复合光催化剂的催化活性最高.
3、关键词：活性炭；孔结构；TiO2；光催化活性中图分类号：O643EffectofPoreStructureofActivatedCarbononthePhotocatalyticActivityofTiO2/ACCompositePhotocatalyst*LIUShou鄄XinCHENXiao鄄Yun(KeyLaboratoryofBiologicalMaterialsoftheMinistryofEducation,NortheastForestryUniversity,Harbin150040,P.R.China
4、)Abstract：Withtheaimofinvestigatingtheeffectofporestructureofactivatedcarbon(AC)onthephotocatalyticactivityofTiO2/ACcompositephotocatalyst,4kindsofACwithsimilarsurfacechemicalcharacteristicsanddifferentporestructureswereusedandcompared.Phenoldegradationwasusedfo
5、rphotocatalyticactivitytest.N2adsorptionisotherm(77K)wasusedforBETsurfacearea(SBET),porevolume,andporesizedistributionmeasurement.Boehmtitrationandelementalanalysiswereusedforsurfacechemicalcharacteristicsdetermination.XRD,DRS,andSEMwereusedtocharacterizethecrys
6、talstructure,spectracharacteristics,andsurfaceproperties.TheresultsshowedthattheporestructureofAChadsignificanteffectonthephotocatalyticactivityofTiO2/AC.ThesynergisticcoefficientsfortheactivityenhancementofAC1,AC2,AC3,andAC4were1.55,2.03,1.28,and1.43,respective
7、ly,whichexhibitedthesimilartendencywiththecontactinterface(驻S).ACwithbothdevelopedmicroporeandmesoporestructuresexhibitedthehighestactivitywhencompositedwithTiO2.Thedevelopedmicroporestructurecanprovidemoreadsorptionsitesforpollutantmolecules.Moremesoporecanbebe
8、neficialtothetransferofadsorbedphenolfromadsorptionsitestoactiveTiO2.Also,themesoporecaninhibittheaggregationofnano鄄sizeTiO2,improveitsdispersionandincreasethecontact
