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

第20卷第4期高校化学工程学报No.4Vol.202006年8月JournalofChemicalEngineeringofChineseUniversitiesAug.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1,赵靓2,赵景联1,侯永平1,种法国1,梁勇1（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：采用浸渍法以TiO2为载体制备了固载型杂多酸光催化剂⎯⎯H3PW12O40/TiO2，H8SiW12O42/TiO2，H7PMo12O42/TiO2。通过Hammett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、浸渍时间、浸渍浓度、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TiO2的表面，得到了催化活性较TiO2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TiO2的79%提高到91%。以磷钨酸水溶液浸渍TiO2，浸渍浓度为0.10mol⋅L−1，浸渍时间为28h，烘干温度为120℃，微波炉焙烧功率为650W，烧结时间为40min制得的催化剂活性最高。在HPA-TiO2光催化系统中，杂多酸显著加速电子从TiO2表面到O2分子的传递，改变了TiO2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中图分类号：X703；TQ085；TQ032.4；TQ426.61文献标识码：APreparationandPhotocatalyticActivityofHeteropolyacidSupportedonTitaniumDioxidePhotocatalystsSUNYa-ping1,ZHAOLiang2,ZHAOJing-lian1,HOUYong-ping1,CHONGFa-guo1,LIANGYong1（1.EnvironmentalEngineering,Xi’anJiaotongUniversity,Xi’an710049,China;2.SchoolofPhysics,PekingUniversity,Beijing100871,China）Abstract:Threekindsofheteropolyacid（HPA）supportedontitaniumdioxide(TiO2)photocatalysts—H3PW12O40/TiO2,H8SiW12O42/TiO2,andH7PMo12O42/TiO2werepreparedseparatelybyimmersingTiO2powderineachcorrespondingaqueoussolutionofHPA,andthenagglomeratedatacertaintemperature.TheacidintensitiesofsupportedHPAphotocatclystsweredeterminedbyHammettindicatorassociatedwithUVspectrum.TheeffectsofthekindsofHPA,immersingtime,concentrationofHPAaqueoussolution,thetemperatureandmodeofagglomerationontheacidintensityofthesupportedHPAphotocatalystswereinvestigated.ThesupportedHPAphotocatalystswerecharacterizedbyIRspectrumandtheirphotocatalyticactivitiesweremeasuredbythephotodegradationexperimentsofacidbrilliantred3R.ResultsshowthatHPAisloadedonthesurfaceofTiO2anditcausesthepreparedcatalysthashigheracidintensity.ThesupportedHPAphotocatalystspreparedhavehighercatalyticactivitiesthanthatofunloadedTiO2,anditsphotodegradationefficiencyforacidbrilliantred3Risincreasedfrom79%to91%.AmongtheabovementionedthreekindsofHPA/TiO2photocatalysts,theca