影像科学与光化学 ›› 1994, Vol. 12 ›› Issue (2): 177-181.DOI: 10.7517/j.issn.1674-0475.1994.02.177

• 研究简报 • 上一篇    下一篇

在CdS水悬浮液中O2光吸收的pH效应

席婵娟, 李庆霖, 金振声   

  1. 中国科学院兰州化学物理研究所 兰州 730000
  • 收稿日期:1993-03-29 修回日期:1993-06-15 出版日期:1994-05-20 发布日期:1994-05-20
  • 通讯作者: 金振声
  • 基金资助:
    国家自然科学基金

pH EFFECT OF 02 PHOTOUPTAKE IN AQUEOUS SUSPENSION OF CdS

  • Received:1993-03-29 Revised:1993-06-15 Online:1994-05-20 Published:1994-05-20

摘要: 为了深入了解间接光腐蚀过程, Grätzel等人曾考察过O2在CdS和Rh203/CdS 悬浮液(pH=9)中光吸收行为, 发现光照生成的SO42-的µmol数值基本上为加入O2的µmol数值的一半, 且反应后悬浮液的pH降低[3]

关键词: 光吸收, 光腐蚀, 硫化镉

Abstract: The pH effect of photouptake of O2 on CdS and Pt/CdS was investigated. The resultindicates that there are two types of mechanism for O2 photouptake aqueous dispersions of CdS and Pt/CdS. In acidic condition,O2 photouptake proceeds continuously and canbe described with 1st order rate equation. In basic condition,O2 photouptake ceaises afterhalf an hour irradiation,which is illustrated by following equations: CdS+2O22-+2h+→Cd2++SO42- Cd2++2OH-→Cd(OH)2 Then,the surface of CdS is covered by Cd(OH)2 and the O2 uptake is hindered.

Key words: photouptake, photocorrosion, cadmium sulfide