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化学学报
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化学学报 ›› 2005, Vol. 63 ›› Issue (1): 65-70. 上一篇    下一篇

研究论文

高度分散的Pt/TiO2的制备及光催化活性

张青红，高濂*   

  1. (中国科学院上海硅酸盐研究所 高性能陶瓷和超微结构国家重点实验室 上海 200050)
  • 投稿日期:2004-04-06 修回日期:2004-09-14 发布日期:2010-12-10
  • 通讯作者: 高濂

Preparation and the Enhanced Photocatalytic Activity of Highly Dispersed Pt Loaded on TiO2 Nanocrystals

ZHANG Qing-Hong, GAO Lian*   

  1. (State Key Laboratory of High Performance Ceramics and Superfine Microstructure, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050)
  • Received:2004-04-06 Revised:2004-09-14 Published:2010-12-10
  • Contact: GAO Lian

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用柠檬酸作为空穴捕获剂和分散剂, 在温和条件下用光催化还原法将3 nm金属铂沉积在7 nm的锐钛矿相及介孔二氧化钛纳米晶表面. TEM观察显示铂的负载量为w＝1.0%时, 多数二氧化钛纳米晶表面沉积了岛状的铂团簇, XPS和电子衍射结果表明铂以游离态存在. 负载w＝1.0%～2.0%铂的TiO2在苯酚光氧化反应中活性显著提高. Pt/TiO2在氨气中经550 ℃氮化, 可制得氮掺杂的Pt/TiO2可见光光催化剂, 氮化过程中铂团簇没有烧结和显著长大.

关键词: 二氧化钛, 光催化沉积, 光催化剂, 铂, 可见光催化

The metallic platinum clusters in size of 3 nm were photocatalytically deposited on anatase (7 nm) or mesoporous TiO2 in the presence of citric acid as a double-functional agent (a hole scavenger and a dispersant to keep Pt clusters from agglomeration). The particle size of the deposited platinum was uniform and in the range of 3～4 nm, and the surface of majority of TiO2 nanocrystals was deposited with an island of Pt cluster. Both XPS and ED results identified that the deposited Pt consisted of metallic atoms. The Pt/TiO2 showed a significantly enhanced photocatalytic activity using the degradation of phenol as a model reaction. The Pt/TiO2 was subjected to nitridation in the flowing NH3 at 550 ℃, and Pt-loaded TiO2-xNx nanocrystals were obtained. The particle size of Pt clusters was preserved and Pt clusters were not sintered at this temperature.

Key words: titania, photocatalytic deposition, photocatalyst, platinum, visible light driven photocatalysis