Cr(Ⅵ)离子在CdS催化剂上的吸附及光催化还原

doi:10.7517/j.issn.1674-0475.1997.01.39

影像科学与光化学 ›› 1997, Vol. 15 ›› Issue (1): 39-44.DOI: 10.7517/j.issn.1674-0475.1997.01.39

Cr(Ⅵ)离子在CdS催化剂上的吸附及光催化还原

付宏祥, 吕功煊, 李树本

中国科学院兰州化学物理研究所, 羰基合成与选择氧化国家重点实验室, 兰州730000

收稿日期:1996-05-10 修回日期:1996-10-09 出版日期:1997-02-20 发布日期:1997-02-20
通讯作者: 付宏祥

INVESTIGATION OF ADSORPTION AND PHOTOCA-TALYTIC REDUCTION OF Cr(Ⅵ) IN CdS DISPERSIONS

FU Hongxiang, LU Gongxuan, LI Shuben

State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, The Chinese Academy of Sciences, Lanzhou 730000, P. R. China

Received:1996-05-10 Revised:1996-10-09 Online:1997-02-20 Published:1997-02-20

摘要/Abstract

摘要： Cr(Ⅵ)在CdS光催化剂上具有较强的暗态吸附,适当的热处理会增强Cr(Ⅵ)离子的吸附;在未经热处理的CdS催化剂上,Cr(Ⅵ)的吸附表现为接近于一个吸附单层的特征,而当催化剂经过了300℃的热处理,Cr(Ⅵ)离子在催化剂表面上的吸附会增加,吸附表现为超过一个单层的特征。热处理过程同样会增加催化剂的光催化活性。对于整个光催化反应而言,吸附过程是反应的控制步骤。Cr(Ⅵ)的光催化还原伴随CdS催化剂的光腐蚀。

关键词: Cr(Ⅵ)离子, 吸附, 光催化还原

Abstract: This paper presents the results of Cr(Ⅵ) adsorption and photocatalytic reduction in CdS dispersion. CdS exhibits quite high adsorption and photocatalytic reduction activities. Treatment of CdS in the air under 300℃ or less resulted in the promotion of activities for Cr(Ⅵ) adsorption and photocatalytic reduction. The adsorption of Cr(Ⅵ) on the untreated CdS catalyst surface was near monolayer, while the adsorption on the treated CdS catalyst surface was multilayer. Comparative study of adsorption and photocatalytic reaction indicated that adsorption step is rate-control step of whole reaction. During Cr(Ⅵ) reduction, photocorrosion was observed.

Key words: Cr(Ⅵ) ion, adsorption, photocatalytic reduction

付宏祥, 吕功煊, 李树本. Cr(Ⅵ)离子在CdS催化剂上的吸附及光催化还原[J]. 影像科学与光化学, 1997, 15(1): 39-44.

FU Hongxiang, LU Gongxuan, LI Shuben. INVESTIGATION OF ADSORPTION AND PHOTOCA-TALYTIC REDUCTION OF Cr(Ⅵ) IN CdS DISPERSIONS[J]. Imaging Science and Photochemistry, 1997, 15(1): 39-44.

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Cr(Ⅵ)离子在CdS催化剂上的吸附及光催化还原

INVESTIGATION OF ADSORPTION AND PHOTOCA-TALYTIC REDUCTION OF Cr(Ⅵ) IN CdS DISPERSIONS

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