影像科学与光化学 ›› 1988, Vol. 6 ›› Issue (2): 7-12.DOI: 10.7517/j.issn.1674-0475.1988.02.7

• 研究论文 • 上一篇    下一篇

分子氧在锐钛矿型TiO2表面的光助吸附和光助脱附

王利盛1, 马福泰1, 俞稼镛2   

  1. 1. 杭州大学化学系, 杭州;
    2. 中国科学院感光化学研究所, 北京
  • 收稿日期:1986-10-20 修回日期:1987-12-07 出版日期:1988-05-20 发布日期:1988-05-20

PHOTO-ASSISTED ADSORPTION/DESORPTION OF MOLECULAR OXYGEN ON/FROM ANATASE SURFACE

WANG LI-SHENG1, MA FU-TAI1, YU JlA-YONG2   

  1. 1. Chemittry Department of Hanfzhou University, Hangzhou;
    2. Institute of Photographic Chemistry, Academia Sinica, Beijing
  • Received:1986-10-20 Revised:1987-12-07 Online:1988-05-20 Published:1988-05-20

PDF (PC)

1178

摘要： 本文采用真空-质谱技术研究了紫外线照射下分子氧在锐钛矿型TiO2表面的吸附和脱附机理。氧光助吸附后,锐钛矿表面成为活化表面。活化表面的O2-(分子氧在锐钛矿表面的吸附态)在1.33×10-3Pa的真空中,在能量大于锐钛矿禁带宽度2.9eV的紫外线照射下成为分子氧脱附,氧脱附后的表面在无紫外线照射的氧气氛中对分子氧有吸附作用,该O2-饱和吸附量大于相同氧压下紫外线照射下O2的饱和吸附量。在氧压和光强度相同的条件下,O2-吸附量与表面羟基化程度呈线性关系。

关键词: 锐钛矿, 分子氧, 光助吸附, 光助脱附

Abstract: The mechanism of adsorption/desorption of molecular oxygen on/from anatase surface with UV irradiation was studied using the technique of vacuum-mass-spectroscopy. After photo-assisted adsorption of oxygen the anatase surface became active. After the desorption. of O2- (the adsorption state of molecular oxygen on anatase surface) in the form of molecular oxygen from anatase surface under vacuum (1.33×10-3 Pa) with UV irradiation the active surface could adsorb molecular oxygen in oxygen atmosphere without UV irradiation and the adsorption quantity of O2-, was greater tha that of O2- with UV irradiation. If the energy of UV is greater than the energy gap of anatase (2.9 eV) the desorption of O2- will occur. The adsorption quantity of O2- is in proportion to the quantity of surface hydroxyl.

Key words: anatase, oxygen, photo-assisted adsorption, photo-assisted desorption

京ICP备05002791-6号
版权所有 © 《影像科学与光化学》编辑部
地址：北京市海淀区中关村东路29号 中国科学院理化技术研究所　邮编：100190
电话：010-82543683　 Email：xb@mail.ipc.ac.cn
技术支持：北京玛格泰克科技发展有限公司