催化学报

催化学报 ›› 2011, Vol. 32 ›› Issue (1): 36-45.DOI: 10.1016/S1872-2067(10)60157-X

• 研究论文 • 上一篇    下一篇

Ag@AgCl 修饰的锐钛矿相 TiO2 纳米管的制备及其光催化性能

温艳媛, 丁旵明   

  1. 华东师范大学化学系, 上海 200062
  • 收稿日期:2010-07-13 修回日期:2010-08-19 出版日期:2011-01-13 发布日期:2014-05-22

Preparation and Photocatalytic Activity of Ag@AgCl Modified Anatase TiO2 Nanotubes

WEN Yanyuan, DING Hanming*   

  1. Department of Chemistry, East China Normal University, Shanghai 200062, China
  • Received:2010-07-13 Revised:2010-08-19 Online:2011-01-13 Published:2014-05-22

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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 1 h 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.

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

Abstract: 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 oC. 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 activity, which was due to its large adsorption capacity, wide visible light response due to the SPR effect, fast separation of photogenerated electron-hole pairs, and strong oxidizing ability of Cl0 generated by combining Cl- ions with photoexcited holes. Methylene blue dye was thoroughly 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.

Key words: silver, silver chloride, titanium dioxide, nanotube, surface plasmon resonance, visible light activation, photocatalysis, methylene blue