Processes influencing surface interaction and photocatalytic destruction of microcystins on titanium dioxide photocatalysts

Linda A. Lawton*, Peter K J Robertson, Benjamin J P A Cornish, Iain L. Marr, Marcel Jaspars

*Corresponding author for this work

Research output: Contribution to journalArticle

98 Citations (Scopus)

Abstract

Microcystins are a family of hepatotoxic peptides produced by freshwater cyanobacteria. Their occurrence in drinking water is of concern since chronic exposure to these toxins causes tumor promotion. It is therefore essential to establish a reliable treatment strategy that will ensure their removal from potable water. We have previously described the rapid destruction of microcystin-LR using TiO2 photocatalysis, however, since there are at least 70 microcystin variants it is essential that the destruction of a number of microcystins be evaluated. In this study the dark adsorption and destruction of four microcystins was followed over a range of pH. All four microcystins were destroyed although the efficiency of their removal varied. The two more hydrophobic microcystins (-LW and -LF) were found to have high dark adsorption (98 and 91% at pH 4) in contrast to microcystin-RR, which was found to have almost no (only 2-3%) dark adsorption across all pH. 

Original languageEnglish
Pages (from-to)109-113
Number of pages5
JournalJournal of Catalysis
Volume213
Issue number1
Early online date02 Dec 2002
DOIs
Publication statusPublished - 01 Jan 2003

Keywords

  • Cyanotoxins
  • Microcystins
  • Photocatalysis
  • Structure-degradation relationship
  • Surface adsorption
  • TiO

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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