二氧化钛固载杂多酸催化剂的制备及其光催化性能研究.doc

二氧化钛固载杂多酸催化剂的制备及其光催化性能研究 第2O卷第4期 2006年8月 高校化学工程 JoumalofChemicalEngineeringofChineseUniversities N0.4VoI.2O Aug.2006 文章编号:1003-9015(2006)04-0554?05 二氧化钛固载杂多酸催化剂的制备及其光催化性能研究 孙亚萍,赵靓2赵景联,侯永平,种法国,梁勇. (1.西安交通大学环境工程系,陕西西安710049;2.北京大学物理学院,北京100871) 摘要:采用浸溃法以Ti02为载体制备了固载型杂多酸光催化剂——爿wl202,I-IsSiWl204删02, H7PMol204/ri()2.通过Hammer指示剂与紫外光谱相结合的方法测定固体杂多酸催化剂的酸度,分别考察杂多酸种类, 漫溃时间,浸溃浓度,烧结方式,烧结温度对催化剂酸度的影响,并对所制备的催化剂进行了红外光谱和光催化活性 测试.结果表明,杂多酸固载到Ti()2的表面,得到了催化活性较Ti()2更强的复合杂多酸光催化剂,其对酸性大红3R 的降解率从纯Ti()2的79%提高到91%.以磷钨酸水溶液浸溃Ti()2,浸溃浓度为0.10mol?L-,浸溃时间为28h,烘干 温度为120℃,微波炉焙烧功率为650W,烧结时间为40rain制得的催化荆活性最高.在HPA-TiO2光催化系统中.杂 多酸显着加速电子从Ti()2表面到()2分子的传递,改变了Ti()2光催化反应历程,从而提高光催化效率. 关键词:固载酸光催化剂;二氧化钛;杂多酸;光催化;酸性大红3R 中圈分类号:X703~TQ085;TQ032.4;TQ426.61文献标识码:A PreparationandPhotocatalyticActivityofHeteropol~racidSupportedonTitanium DioxidePhotocatalysts SUNYa-ping,ZHAOLiang2 , ZHAOJing-lian,HOUYong-ping,CHONGFa-guo,LIANGYong (1.EnvironmentalEngineering,Xi811JiaotongUniversity,Xiall710049,China; 2.SchoolofPhysics,PekingUniversity,Beijing100871,China) Abstract:Threekindsofheteropolyacid(I-IPA)supportedontitaniumdioxide(TIC2)photocatalysts-- H3PW120iO2,HsSiWI2042/TiO2,andHTPMoI2042/TiO2werepreparedseparatelybyimmersingTi02powder ineachcorrespondingaqueoussolutionofHPA,andthenagglomeratedatacertaintemperature.Theacid intensitiesofsupportedHPAphotocatclystsweredeterminedbyHammerindicatorassociatedwithUV spectrum.TheeffectsofthekindsofHPA,immersingtime,concentrationofHPAaqueoussolution,the temperatureandmodeofagglomerationontheacidintensityofthesupportedI-IPAphotocatalystswere investigated.ThesupportedHPAphotocatalystswerecharacterizedbyIRspeetnnnandtheirphotocatalytic activitiesweremeasuredbythephotodegradationexperimentsofacidbrilliantred31LResultsshowthatHPAiS loadedonthesurfaceofTiO2anditcausesthepreparedcatalysthashigheracidintensity.Thesupported photocatalystspreparedhavehighercatalyticactivitiesthanthatofunloadedTiO2, anditsphotodegradation efficiencyforacidbrilliantred3RiSincreasedfrom79%to91%.Amongtheabovementi