The photocatalytic decomposition of microcystin-LR using selected titanium dioxide materials

Iain Liu, Linda A. Lawton, Detlef W. Bahnemann, Lei Liu, Bernd Proft, Peter K J Robertson*

*Corresponding author for this work

Research output: Contribution to journalArticle

43 Citations (Scopus)

Abstract

Microcystins (cyclic heptapeptides) produced by a number of freshwater cyanobacteria are a potential cause for concern in potable water supplies due to their acute and chronic toxicity. TiO2 photocatalysis is a promising technology for removal of these toxins from drinking water. It is, however, necessary to have a sufficient knowledge of how the catalyst materials cause the degradation of the toxins through the photocatalytic process. The present study reports microcystin degradation products of the photocatalytic oxidation by using a number of commercial TiO2 powder (P25, PC50, PC500 and UV100) and granular (KO1, KO3, TiCat-C, TiCat-S) materials, so aiding the mechanistic understanding of this process. Liquid chromatography-mass spectrometry analysis demonstrated that the major destruction pathway of microcystin for all the catalysts tested followed almost the same pathway, indicating the physical properties of the catalysts had little effects on the degradation pathway of microcystin-LR. 

Original languageEnglish
Pages (from-to)549-553
Number of pages5
JournalChemosphere
Volume76
Issue number4
Early online date17 Apr 2009
DOIs
Publication statusPublished - Jul 2009

Keywords

  • Cyanotoxin
  • Microcystin-LR
  • Photocatalyst
  • TiO

ASJC Scopus subject areas

  • Environmental Chemistry
  • Chemistry(all)

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