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Open AccessArticle

Photocatalytic Degradation of Microcystins by TiO2 Using UV-LED Controlled Periodic Illumination

1
Centre for Advanced Materials Joining, Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada
2
Waterloo Institute of Nanotechnology, University of Waterloo, Waterloo, ON N2L 3G1, Canada
3
Department of Biology, University of Waterloo, Waterloo, ON N2L 3G1, Canada
4
School of Mechanical Engineering and Automation, International Research Institute for Multidisciplinary Science, Beihang University, 37 Xueyuan Rd, Beijing 100191, China
*
Author to whom correspondence should be addressed.
Denotes equal contribution.
Catalysts 2019, 9(2), 181; https://doi.org/10.3390/catal9020181
Received: 18 January 2019 / Revised: 9 February 2019 / Accepted: 11 February 2019 / Published: 14 February 2019
(This article belongs to the Special Issue Emerging Trends in TiO2 Photocatalysis and Applications)
Toxic microcystins (MCs) produced by freshwater cyanobacteria such as Microcystis aeruginosa are of concern because of their negative health and economic impacts globally. An advanced oxidation process using UV/TiO2 offers a promising treatment option for hazardous organic pollutants such as microcystins. The following work details the successful degradation of MC-LA, MC-LR, and MC-RR using a porous titanium–titanium dioxide (PTT) membrane under UV-LED light. Microcystin quantitation was achieved by sample concentration and subsequent LC–MS/MS analysis. The PTT membrane offers a treatment option that eliminates the need for the additional filtration or separation steps required for traditional catalysts. Controlled periodic illumination was successfully used to decrease the total light exposure time and improve the photonic efficiency for a more cost-effective treatment system. Individual degradation rates were influenced by electrostatic forces between the catalyst and differently charged microcystins, which can potentially be adjusted by modifying the solution pH and the catalyst’s isoelectric point. View Full-Text
Keywords: Microcystis aeruginosa; microcystin; controlled periodic illumination; titanium dioxide; advanced oxidation process Microcystis aeruginosa; microcystin; controlled periodic illumination; titanium dioxide; advanced oxidation process
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MDPI and ACS Style

Schneider, O.M.; Liang, R.; Bragg, L.; Jaciw-Zurakowsky, I.; Fattahi, A.; Rathod, S.; Peng, P.; Servos, M.R.; Zhou, Y.N. Photocatalytic Degradation of Microcystins by TiO2 Using UV-LED Controlled Periodic Illumination. Catalysts 2019, 9, 181.

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