The Destruction of Cyanobacterial Toxins by Titanium Dioxide

Peter K. J. Robertson, Linda A Lawton, Burkhard Munch, Ben Cornish

Research output: Contribution to journalArticlepeer-review


Cyanobacterial (blue-green algal) toxins are extremely toxic naturally occurring substances which display hepato- and neurotoxic behaviour (1, 2). In this paper we report the application of titanium dioxide photocatalysis for the destruction of two of these compounds, microcystin-LR and anatoxin-a. The destruction of microcystin appears to follow Langmuir-Hinshelwood kinetics although a discrepancy was observed between adsorption constants determined for the photocatalytic process with those obtained from dark isotherms. A square root dependence between illumination intensity and rate of microcystin destruction was noted. When the destruction was performed in the presence of the naturally occurring pigment it appeared that the pigment also contributes to the destruction of the toxin. Toxicity studies on the photocatalysed toxin solutions indicates that the toxicity is substantially reduced within 30 min photolysis.
Original languageEnglish
Pages (from-to)20-26
Number of pages7
JournalJournal of Advanced Oxidation Technologies
Issue number1
Publication statusPublished - Jan 1999


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