STUDY ON PHOTO INDUCED AND PHOTOCATALYTIC REACTIONS IN Cr (Ⅵ) CHLOROPHENOL CO EXISTED POLLUTION SYSTEMS

doi:10.7517/j.issn.1674-0475.1998.03.237

Abstract

Abstract: UV induced Cr (Ⅵ) reduction in Cr (Ⅵ) 4CP co existed pollution system mainly results from the redox reaction between Cr (Ⅵ) ion and photolysis products of 4CP.The light intensity and system acidity affect Cr (Ⅵ) reduction dramatically.The pollutants can be easily removed and decontaminated because some precipitate of products is formed after the photo induced reaction in neutral medium.This is an important result for the application of photo chemistry to the decontamination in complex component pollution mixtures.The presence of 4CP has no interference on Cr (Ⅵ) dark adsorption on TiO₂. Under UV irradiation, the reaction in Cr (Ⅵ) 4CP TiO₂ system is much complicated and two different reactions contribute to the overall Cr (Ⅵ) reduction:photo induced homogeneous reaction between Cr (Ⅵ) and 4CP,and photocatalytic reduction of Cr (Ⅵ) ion by TiO₂ as an efficient semiconductor photocatalyst,which is promoted by another photocatalytic half reaction:4CP degradation.Cr (Ⅵ) reduction in Cr (Ⅵ) 4CP and Cr (Ⅵ) 4CP TiO₂ systems under UV irradiation are both zero order reactions.In the condition of excluding other homogeneous reactions,the promotion effect of 4CP on photocatalytic reduction of Cr (Ⅵ) ion is distinguished and proved.

Key words: chlorophenol, photo induced reduction, photocatalysis, acidity

FU Hongxiang, LU Gongxuan, LI Shuben . STUDY ON PHOTO INDUCED AND PHOTOCATALYTIC REACTIONS IN Cr (Ⅵ) CHLOROPHENOL CO EXISTED POLLUTION SYSTEMS[J]. Imaging Science and Photochemistry, 1998, 16(3): 237-244.

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STUDY ON PHOTO INDUCED AND PHOTOCATALYTIC REACTIONS IN Cr (Ⅵ) CHLOROPHENOL CO EXISTED POLLUTION SYSTEMS

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