高等学校化学学报

高等学校化学学报 ›› 2003, Vol. 24 ›› Issue (2): 320.

• 论文 • 上一篇    下一篇

LaBO3(B=Fe,Co)中氧的迁移与光催化反应活性

桑丽霞1, 钟顺和1, 傅希贤2   

  1. 1. 天津大学化工学院;
    2. 天津大学理学院, 天津 300072
  • 收稿日期:2001-09-08 出版日期:2003-02-24 发布日期:2003-02-24
  • 通讯作者: 钟顺和(1938年出生),男,教授,博士生导师,从事光促表面反应技术和多相催化的研究.E-mail:shzhong@tju.edu.cn E-mail:shzhong@tju.edu.cn
  • 基金资助:

    国家自然科学基金(批准号:5977019)资助

Oxygen Migration and Photocatalystic Activity of Pervoskite-type Oxides

SANG Li-Xia1, ZHONG Shun-He1, FU Xi-Xian2   

  1. 1. School of Chemical Engineering;
    2. School of Science, Tianjin University, Tianjin 300072, China
  • Received:2001-09-08 Online:2003-02-24 Published:2003-02-24

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摘要： 以柠檬酸法合成的钙钛矿型复合氧化物LaBO3(B=Fe,Co)为催化剂,对水溶性染料进行光催化降解,实验结果表明,其光催化活性与钙钛矿型结构中氧空位沿BO6八面体棱边以曲线而非直线的迁移机制有关.在光催化氧化过程中,光生电子首先被表面氧空位束缚,再与表面的吸附氧反应生成超氧基(O2-·)而加速对染料分子的降解.钙钛矿型复合氧化物中的氧空位是由氧的迁移产生的,它可以作为电子的陷阱而捕俘电子,并作为氧的吸附中心而提高催化剂表面的吸附氧量.

关键词: 钙钛矿型复合氧化物, 氧空位, 氧的迁移, 染料降解, 光催化氧化

Abstract: The degradation experiments of water-soluble dye were carried out in the suspension systems of pervoskite-type oxides LaBO3(B=Fe, Co) prepared by citrate method, and the results show that photocatalytic activity is related with the mechanism of oxygen vacancies migration in the pervoskite-type structure which takes place along the anion octahedron edge, although not in linear fashion but via a curved path, resulting in a significantly lower energy barrier. In the photocatalytic oxidation reaction, electrons are trapped by oxygen vacancies at or near the surface and then form superoxide with adsorbed oxygen, which can make dye degrade rapidly. Oxygen vacancies in the pervoskite-type structure produced by oxygen migration act as electron traps and accordingly increase the amount of the absorbed oxygen on the surface.

Key words: Pervoskite-type oxides, Oxygen vacancy, Oxygen migration, Dye degradation, Photocatalystic oxidation

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