Ag@AgCl修饰的锐钛矿相TiO_2纳米管的制备及其光催化性能  

Preparation and Photocatalytic Activity of Ag@AgCl Modified Anatase TiO_2 Nanotubes

作　　者：温艳媛[1] 丁旵明[1] 

机构地区：[1]华东师范大学化学系,上海200062

出　　处：《催化学报》2011年第1期36-45,共10页

基　　金：国家自然科学基金(20971044)

摘　　要：首先采用水热合成法和双氧水处理制备了具有锐钛矿相的TiO2纳米管,然后通过沉淀和光化学反应将Ag@AgCl纳米粒子负载于其上,从而制得TiO2纳米管负载的表面等离子体光催化剂.结果表明,经Ag@AgCl纳米粒子修饰后,锐钛矿相TiO2纳米管因表面等离子共振效应而对可见光具有明显的响应,光生电子-空穴对更容易分离,因而TiO2纳米管的可见光催化活性提高.该催化剂对亚甲基蓝分子具有很强的吸附能力,可见光下照射1h后即可完全降解脱色.另外,该光催化剂重复使用5次后,亚甲基蓝脱色率仍保持在90%以上.The combination of TiO2 nanotubes and a surface plasmon resonance（SPR） photocatalyst used their large adsorption capacity and wide visible light response,respectively,and a synergistic effect to enhance photocatalytic activity under visible light irradiation.Anatase TiO2 nanotubes were prepared by hydrothermal synthesis,a hydrogen peroxide treatment,and calcination at 400 ℃.AgCl nanoparticles were then loaded onto the TiO2 nanotubes by a precipitation reaction,and some of the AgCl particles were reduced to Ag particles under halogen tungsten lamp irradiation.This gave a visible light SPR photocatalyst of Ag@AgCl/TiO2 nanotubes that exhibited high photocatalytic activ-ity,which was due to its large adsorption capacity,wide visible light response due to the SPR effect,fast separation of photogenerated elec-tron-hole pairs,and strong oxidizing ability of Cl0 generated by combining Cl ions with photoexcited holes.Methylene blue dye was thor-oughly decolorized within 1 h in the presence of this photocatalyst under visible light irradiation.In addition,the photocatalyst was stable after recycling the photocatalytic reaction five times.

关 键 词：银 氯化银 二氧化钛 纳米管 表面等离子共振 可见光响应 光催化 亚甲基蓝 

分 类 号：O643.36[理学—物理化学]