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

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

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.

Citation

LAWTON, L., ROBERTSON, P., CORNISH, B., MARR, I. and JASPARS, M. 2003. Processes influencing surface interaction and photocatalytic destruction of microcystins on titanium dioxide photocatalysts. Journal of catalysis [online], 213(1), pages 109-113. Available from: https://doi.org/10.1016/S0021-9517(02)00049-0

• Journal Article Type: Article
• Acceptance Date: Oct 9, 2002
• Online Publication Date: Dec 2, 2002
• Publication Date: Jan 1, 2003
• Deposit Date: Feb 27, 2007
• Publicly Available Date: Feb 27, 2007
• Journal: Journal of catalysis
• Print ISSN: 0021-9517
• Electronic ISSN: 1090-2694
• Publisher: Elsevier
• Peer Reviewed: Peer Reviewed
• Volume: 213
• Issue: 1
• Pages: 109-113
• DOI: https://doi.org/10.1016/S0021-9517%2802%2900049-0
• Keywords: TiO2; Photocatalysis; Surface adsorption; Microcystins; Cyanotoxins; Structure degradation relationship
• Public URL: http://hdl.handle.net/10059/49
• Contract Date: Feb 27, 2007