Pd改性TiO_2的光谱特性及气相甲苯光催化降解性能  

Spectral Properties and Gas-Phase Toluene Photocatalytic Degradation Performance of Pd-Modified TiO_2 Catalysts

作　　者：方奕文[1,2] 余林[1] 余坚[1] 叶飞[1] 孙明[1] 

机构地区：[1]广东工业大学轻工化工学院,中国广州510006 [2]汕头大学化学系,中国汕头515063

出　　处：《湖南师范大学自然科学学报》2012年第3期40-44,共5页Journal of Natural Science of Hunan Normal University

基　　金：广东省自然科学基金重点资助项目(10251009001000003);广东省科技计划资助项目(2008B080701032)

摘　　要：采用等体积浸渍法和溶胶-凝胶法制备了Pd负载(用Pd/TiO2表示)和Pd掺杂(用Pd-TiO2表示)两类TiO2催化剂,用XRD、SEM、UV-Vis DRS等对其进行分析.结果表明,用溶胶-凝胶法制备Pd-TiO2,能有效抑制产物晶粒的增长和团聚,提高晶体的相转变温度和对可见光的吸收;而用浸渍法制备Pd/TiO2,虽然也能抑制晶粒的团聚,但在500℃焙烧温度下,产物晶相中便出现了金红石相,且晶粒大小比纯TiO2还大.将Pd-TiO2催化剂应用于气相甲苯光催化降解反应,得到了良好的效果,当n(Pd)/n(Ti)=0.3%时,Pd-TiO2催化剂的甲苯单程降解率达到45.1%.Two kinds of Pd-modified TiO2 catalysts were synthesized by sol-gel（Pd-TiO2） and impregnation method（Pd/TiO2）,and characterized by XRD,SEM and UV-Vis DRS.The results showed that the Pd-TiO2 catalysts prepared by sol-gel method can effectively suppress crystal particle growth and reunification,enhance crystal phase transition temperature and absorption of visible light.The Pd/TiO2 catalysts prepared by dipping can inhibit the reunion of the grain,but the rutile-type crystal phases occurred,and the crystallite size was larger than the pure TiO2 at calcination temperatures of 500 ℃.Application of Pd-TiO2 catalyst in photocatalytic degradation of gas-phase toluene got good results.The single-pass degradation rate of toluene reached 45.1% when the Pd/Ti atomic ratio was 0.3%.

关 键 词：钯 二氧化钛 改性 甲苯 光催化降解 

分 类 号：O643.322[理学—物理化学]