Photocatalytic degradation of michler's ketone in water by Uv light illumination using TiO2 photocatalyst: Identification of intermediates and the reaction pathway

Chung Shin Lu, Fu Der Mai, Yi Chin Wu, I. Chun Yao, Peng Yueh Hsu, Chiing Chang Chen

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The TiO2/UV photocatalytic degradation ofMichler's Ketone (MK) has been investigated in aqueous heterogeneous suspensions. Results obtained show rapid and complete oxidation of MK after 24-h, and more than 97.5% of MK was mineralized after a 32-h exposure to UV-365 nm irradiation. Establishment of the reaction pathway was made possible by a thorough analysis of the reaction mixture identifying the main intermediate products generated. Nine intermediates have been detected by HPLC/ESI-MS and GC/ MS techniques. The photocatalytic degradation of MK proceeds through competitive reactions such as N-de-methylation and destruction of the bis-aminobenzophenone structure. The former reaction took place in a stepwise manner to yield mono-, di-, tri-, tetra-demethylated species, while the latter reaction yielded N-methylaminobenzene and aminobenzene. The reaction mechanisms of TiO 2/UV proposed in this study should shed some light on future applications of the technology to the destruction of organic pollutants.

Original languageEnglish
Pages (from-to)729-740
Number of pages12
JournalJournal of the Chinese Chemical Society
Volume56
Issue number4
Publication statusPublished - 2009

Keywords

  • Michler's Ketone
  • Photocatalytic
  • TiO

ASJC Scopus subject areas

  • Chemistry(all)

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