Photocatalyzed N-de-methylation and degradation of crystal violet in titania dispersions under UV irradiation

Chiing Chang Chen, Fu Der Mai, Kung Tung Chen, Chia Wei Wu, Chung Shin Lu

研究成果: 雜誌貢獻文章同行評審

40 引文 斯高帕斯(Scopus)

摘要

TiO2-mediated photocatalytic process has been successfully applied to degrade dye pollutants. In order to obtain a better understanding on the mechanistic details of the TiO2-assisted photodegradation of crystal violet (CV, N,N,N′,N′,N″,N″-hexamethylpararosaniline) dye with UV irradiation, 17 intermediates of the process were separated, identified and characterized by HPLC-ESI-MS techniques in this study. The results indicated that the N-de-methylation degradation of CV dye took place in a stepwise manner to yield mono-, di-, tri-, tetra-, penta-, and hexa-N-de-methylated CV species with N-hydroxymethylated intermediates, which were found for the first time, generated during the processes. Several probable photodegradation pathways were proposed and discussed. The reaction mechanisms of TiO2/UV proposed in this study would be useful for future application of this technology for decoloration of dyes.

原文英語
頁(從 - 到)434-442
頁數9
期刊Dyes and Pigments
75
發行號2
DOIs
出版狀態已發佈 - 2007
對外發佈

ASJC Scopus subject areas

  • 化學工程 (全部)
  • 製程化學與技術

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