Titanium dioxide-mediated photocatalytic degradation of Acridine Orange in aqueous suspensions under UV irradiation

Chung Shin Lu, Fu Der Mai, Chia Wei Wu, Ren Jang Wu, Chiing Chang Chen

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31 Citations (Scopus)


The TiO2/UV photocatalytic degradation of Acridine Orange (AO) was investigated in aqueous heterogeneous suspension. The results indicated that photocatalytic reactions were enhanced in alkaline medium. While the rate of photocatalytic degradation of the dye increased with increasing concentration of TiO2, at high doses of TiO2, the rate of reaction was reduced as a result of light attenuation. To obtain a better understanding of the mechanistic details of this TiO2 assisted dye photodegradation, the intermediates of the processes were separated, identified, and characterized using HPLC-ESI-MS. It was found that N-de-methylation degradation of the dye took place in a stepwise manner to yield mono-, di-, tri-, and tetra-N-de-methylated species. The probable photodegradation pathways are proposed and discussed.

Original languageEnglish
Pages (from-to)706-713
Number of pages8
JournalDyes and Pigments
Issue number3
Publication statusPublished - 2008
Externally publishedYes



  • Acridine Orange
  • Dye
  • N-De-methylation
  • Titanium dioxide

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Process Chemistry and Technology

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