掺铜TiO_2薄膜光催化降解碱性品红的研究_齐帅

—————————————————————————————————————————————Cu-dopingTiO2thinfilmanditsphotocatalyticdegradationofalkalinefuchsinQiShuai，LiuYixin，MengLihua，WangAnan（DepartmentofEarthandSpaceSciences，UniversityofScienceandTechnologyofChina，Hefei230026，China）掺铜TiO2薄膜光催化降解碱性品红的研究齐帅，刘义新，孟丽华，王阿楠（中国科学技术大学地球和空间科学系，安徽合肥230026）［摘要］采用溶胶-凝胶法在硅胶载体颗粒的表面制得Cu掺杂TiO2薄膜，通过扫描电镜（SEM）观察了TiO2纳米颗粒在载体表面的负载情况，显示二氧化钛纳米颗粒在载体表面是均匀分布的。研究了在自然光照条件下，碱性品红在TiO2薄膜上的光催化降解与溶液初始浓度、催化剂用量之间的关系，并比较了掺铜和未掺铜催化剂光催化的效率。结果表明，随着光催化剂投加量的增加，光降解效率增大，但当光催化剂投加量达到一定程度，继续增加其用量，光降解效率增加不多；随着初始浓度的增加，光催化效率在降低。考虑到经济性和光催化效率，选取催化剂的投加量为30.0g/L、品红溶液初始质量浓度为10mg/L时，5d光催化降解率为83.61%。掺铜的TiO2薄膜比不掺铜的TiO2薄膜光催化活性高。催化剂重复使用3次的实验结果表明，其具有很好的稳定性。［关键词］碱性品红；溶胶-凝胶法；Cu掺杂TiO2薄膜；光催化［中图分类号］X703.1［文献标识码］A［文章编号］1005-829X（2009）05-0050-03Abstract：TheevenlydistributedCu-dopingTiO2thinfilmsdepositedoncarriersilicagelhavebeenpreparedbysol-gelprocessing.TheloadingconditionsofTiO2nanoparticlesoncarrierareobservedonscanningelectronmicroscope（SEM）.TheresultsshowthatTiO2nanoparticlesarehomogenizedoncarrier.Undernaturalsunlight，therelationshipofphotocatalyticdegradationofalkalinefuchsinonTiO2thinfilmswiththeinitialconcentrationofthesolutionandthedosageofcatalystisstudied.TheefficiencyofphotocatalysisofCu-dopingcatalystiscomparedwithnon-Cu-dopingcatalyst.Theresultsshowthattheefficiencyofphotocatalyticdegradationincreaseswiththeincreaseofcatalystdosage，butwhencatalystdosagereachesacertainamount，theefficiencyofphotocatalyticdegradationincreasesless.Theefficiencyofphotocatalyticdegradationreduceswiththeincreaseofinitialalkalinefuchsinconcentration.Consideringeconomicefficiencyandefficiencyofphotocatalyticdegradation，whenthecatalystdosageis30.0g/Landinitialalkalinefuchsinconcentrationis10mg/L，therateofphotocatalyticdegradationreaches83.61%in5d.TheCu-dopingTiO2filmhashigherphotocatalyticactivitythannon-Cu-dopingTiO2film.Afterusingthecatalystthreetimes，itsstabilityisassured.Keywords：alkalinefuchsin；sol-gelprocess；Cu-dopingTiO2thinfilm；photocatalysis半导体光催化剂在太阳能储存与利用〔1〕、光化学转换及有机污染物的环境处