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

doi:10.7517/j.issn.1674-0475.1988.02.7

Imaging Science and Photochemistry ›› 1988, Vol. 6 ›› Issue (2): 7-12.DOI: 10.7517/j.issn.1674-0475.1988.02.7

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

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

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

Abstract

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

WANG LI-SHENG, MA FU-TAI, YU JlA-YONG. PHOTO-ASSISTED ADSORPTION/DESORPTION OF MOLECULAR OXYGEN ON/FROM ANATASE SURFACE[J]. Imaging Science and Photochemistry, 1988, 6(2): 7-12.

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

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