光敏化Ag/TiO_2催化剂的制备及其催化性能  

Preparation and Properties of Photosensitized Ag/TiO_2 Catalyst

作　　者：徐志兵[1,2] 严家平[1] 钮志远[2] 万正强[2] 

机构地区：[1]安徽理工大学地球与环境学院,安徽淮南232001 [2]安庆师范学院资源环境学院,安徽安庆246011

出　　处：《石油化工》2013年第3期330-333,共4页Petrochemical Technology

摘　　要：采用溶胶-凝胶法和水热法制备了Ag/TiO2催化剂,并对该催化剂试样进行了XRD和TEM表征。表征结果显示,纳米Ag/TiO2催化剂颗粒的直径在5～20 nm之间,催化剂中Ag纳米颗粒包裹在TiO2颗粒内部。将Ag/TiO2催化剂在叶绿素提取液中浸泡24 h,制成光敏化Ag/TiO2催化剂。以Cr6+溶液为研究对象,分别在紫外光和可见光下考察了纳米TiO2、纳米Ag/TiO2、光敏化TiO2和光敏化Ag/TiO2催化剂的光催化性能。实验结果表明,与其他3种催化剂相比,光敏化Ag/TiO2催化剂光催化还原Cr6+的性能最好,特别是在可见光下,光敏化Ag/TiO2催化剂光催化还原Cr6+150 min后,Cr6+脱除率达到100.0%。Ag/TiO2 catalysts were prepared by a sol-gel method and a hydrothermal method, and characterized by means of XRD and SEM. The results showed that the sizes of the Ag/TiO2 crystal particles were between 5 nm and 20 nm, and the Ag nanoparticles were enwrapped in the TiO2 crystal particles. Photosensitized Ag/TiO2 catalysts were prepared by the impregnation of the Ag/TiOz particles in chlorophyll extract for 24 h. The photo-catalytic activity of TiO2, Ag/TiO2, photosensitized TiO2 and photosensitized Ag/TiO2 catalysts for the reduction of Cr^6＋ in Cr^6＋ solution under UV or visible light were investigated. The results showed that the photo-catalytic activity of the photosensitized Ag/ TiO2 catalyst was highest. The Cr^6＋ removal efficiency over the photosensitized Ag/TiO2 catalyst could reach 100.0% under visible light for 150 rain.

关 键 词：光敏化 叶绿素 银 二氧化钛催化剂 六价铬离子还原 

分 类 号：TQ426.6[化学工程]