The photocatalytic decomposition of microcystin-LR using selected titanium dioxide materials.
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. TiO(2) 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 TiO(2) 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.
Centre for Research in Energy and the Environment, The Robert Gordon University, Schoolhill, Aberdeen AB10 1FR, UK.
Iain
I
Liu
Linda A
LA
Lawton
Detlef W
DW
Bahnemann
Lei
L
Liu
Bernd
B
Proft
Peter K J
PK
Robertson
D002384:Catalysis; D000458:Cyanobacteria / Q000378:metabolism; D008387:Marine Toxins; D052998:Microcystins / Q000737:chemistry*; D010084:Oxidation-Reduction; D010777:Photochemistry; D014025:Titanium / Q000737:chemistry*; D014466:Ultraviolet Rays; D018508:Water Purification / Q000379:methods*
D008387:Marine Toxins; D052998:Microcystins; C009495:titanium dioxide; D014025:Titanium; C057862:cyanoginosin LR