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Photocatalytic degradation of eleven microcystin variants and nodularin by TiO2 coated glass microspheres.

Pestana, Carlos J.; Edwards, Christine; Prabhu, Radhakrishna; Robertson, Peter K.J.; Lawton, Linda A.

Authors

Peter K.J. Robertson



Abstract

Microcystins and nodularin are toxic cyanobacterial secondary metabolites produced by cyanobacteria that pose a threat to human health in drinking water. Conventional water treatment methods often fail to remove these toxins. Advanced oxidation processes such as TiO2 photocatalysis have been shown to effectively degrade these compounds. A particular issue that has limited the widespread application of TiO2 photocatalysis for water treatment has been the separation of the nanoparticulate powder from the treated water. A novel catalyst format, TiO2 coated hollow glass spheres (Photospheres?), is far more easily separated from treated water due to its buoyancy. This paper reports the photocatalytic degradation of eleven microcystin variants and nodularin in water using Photospheres?. It was found that the Photospheres' successfully decomposed all compounds in 5 min or less. This was found to be comparable to the rate of degradation observed using a Degussa P25 material, which has been previously reported to be the most efficient TiO2 for photocatalytic degradation of microcystins in water. Furthermore, it was observed that the degree of initial catalyst adsorption of the cyanotoxins depended on the amino acid in the variable positions of the microcystin molecule. The fastest degradation (2 min) was observed for the hydrophobic variants (microcystin-LY, -LW, -LF). Suitability of UV-LEDs as an alternative low energy light source was also evaluated.

Citation

PESTANA, C.J., EDWARDS, C., PRABHU, R., ROBERTSON, P.K.J. and LAWTON, L.A. 2015. Photocatalytic degradation of eleven microcystin variants and nodularin by TiO2 coated glass microspheres. Journal of hazardous materials [online], 300, pages 347-353. Available from: https://doi.org/10.1016/j.jhazmat.2015.07.016

Journal Article Type Article
Acceptance Date Jul 7, 2015
Online Publication Date Jul 9, 2015
Publication Date Dec 30, 2015
Deposit Date Feb 29, 2016
Publicly Available Date Jul 10, 2016
Journal Journal of hazardous materials
Print ISSN 0304-3894
Electronic ISSN 1873-3336
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 300
Pages 347-353
DOI https://doi.org/10.1016/j.jhazmat.2015.07.016
Keywords Cyanotoxins; Blue-green algae; UVLEDs; Photospheres; Water treatment
Public URL http://hdl.handle.net/10059/1395

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