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1、物理化学学报(WuliHuaxueXuebao)AugustActaPhys.-Chim.Sin.,2006,22(8):953～957953[Article]www.whxb.pku.edu.cnAu改性纳米TiO2材料对NPE-10光催化降解的活性*冯春波杜志平赵永红台秀梅李秋小(中国日用化学工业研究院,太原030001)摘要以钛酸四丁酯和氯金酸为原料,通过溶胶-凝胶法制备了Au掺杂的纳米TiO2光催化剂粉体,并用XRD、BET、XPS和固体紫外可见吸收光谱等技术对其晶相结构、比表面积、表面组成及紫外可见光响应范围进行了表征,对其光催化降解非离子表面活性剂壬基酚聚氧乙烯醚(NPE-10)的
2、活性进行了考察.结果表明,掺杂的Au在纳米TiO粉体材料中可能以两种形态存在,即以Au3+离子形式替代Ti4+进入TiO晶格和以Au原子态形式暴露22于粉体表面.前者使TiO2在480～650nm出现了更强的光吸收;后者中处于表面原子态的Au又会成为光生电子的受体,有效地避免了光生电子空穴对的复合.通过对掺杂量及处理温度的优化,在nAu3+/nTi4+=0.005,500℃煅烧的条件下可以制得具有较高的光催化活性的Au/TiO2粉体.对NPE-10的光催化氧化试验显示,日光照射4h后降解效率可以达到91.8%;而用未改性的纳米TiO2,在同样条件下,NPE-10的光催化降解效率仅能达到50.2
3、%,商品DegussaP-25也只能达到66%.关键词:Au/TiO2,溶胶-凝胶法,可见光响应,光催化降解,壬基酚聚氧乙烯醚(NPE-10)中图分类号:O643PhotocatalyticActivityofAuModifiedNano-TiO2forNPE-10Degradation*FENG,Chun-BoDU,Zhi-PingZhao,Yong-HongTAI,Xiu-MeiLI,Qiu-Xiao(ChinaResearchInstituteofDailyChemicalIndustry,Taiyuan030001)AbstractTheAumodifiednanosizedtitan
4、iumoxide(TiO2)powderswerepreparedbysol-gelrouteatambienttemperatureusingTi(OC4H9)4andHAuCl4asrawmaterials.Theas-preparedsampleswereanalyzedbyXRD,BET,XPSandUV-Visibleabsorptionspectratechnique.Photodegrationfornon-ionicsurfactantnonylphenylpoly(oxyethylene)ethers(NPE-10)wascarriedoutinair-equilibrate
5、dAu/TiO2suspensions.TheresultssuggestedthattheconformationofAuintheTiO2compositewaslargelydependentontheconcentrationofHAuCl4duringthepreparationandtheAu/TiOheat-treatedtemperature.ThedopedAumaytaketheplaceofTi4+inthelatticesofTiOasAu3+orexistatthe22surfaceofTiO2particlesasatoms.Theformermaycontribu
6、tetolightadsorptionrangefrom480to650nm,thelatermaybecometheacceptorofphotoinducede-leadingtoadecreaseofe-/h+recombination.ThepreparationparameterswereoptimizedbymeansofNPE-10degradation.TheoptimizedcatalystwasobtainedatAu/Timolarratioof0.005andcalcinedat500℃.ThedegradationrateofNPE-10couldbeupto91.8
7、%afterirradiated4hinsunlightcomparedto66%fortherateofTiO2-P-25and50.2%fortherateofundopedTiO2.Keywords:Au/TiO2,Sol-gelmethod,Visiblelightresponse,Photocatalyticdegradation,NPE-10近年来,半导体光催化技术在环境保护中的应力强
