The ultraviolet (UV)/titanium dioxide (TiO2)/hydrogen peroxide (H2O2) process (UTHP) has been proven to be effective in removing organics because of its high production of free radicals. In this study, UTHP was further investigated for the photocatalytic degradation of microcystin-LR (MC-LR). Results showed that three mechanisms could realize MC-LR photocatalytic degradation using TiO2. H2O2 could effectively inhibit recombination and considerably improve the production of radicals and superoxides. From a correlation of the removal rate with the isomerization and decomposition of MC-LR under UV irradiation it was inferred that isomerization was crucial for MC-LR degradation during photocatalysis given the vulnerability of the exposed conjugated double bonds. The photocatalysis of MC-LR was apparently dependent on pH and MC-LR initial concentration. Under the optimum conditions of pH 3.5, 0.05 g/L TiO2, and 0.05 mmol/L H2O2, 100% MC-LR (308 μg/L) could be removed within 60 min. This process was accompanied by a synergistic effect during the initial 10 min.
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Research Article|
July 20 2015
Photocatalytic degradation of MC-LR in water by the UV/TiO2/H2O2 process Available to Purchase
Wei-ying Li;
1Key Laboratory of Yangtze River Water Environment, Ministry of Education, Tongji University, 1239 Siping Road, Shanghai 200092, China
E-mail: [email protected]
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Yao Liu;
Yao Liu
2State Key Laboratory of Pollution Control and Resource Reuse, Tongji University, 1239 Siping Road, Shanghai 200092, China
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Xiu-li Sun;
Xiu-li Sun
3Shanghai Branch, Parsons Brinckerhoff Technology (Beijing) Co. Ltd, 668 Xinhua Road, Shanghai 200092, China
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Feng Wang;
Feng Wang
4College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
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Lin Qian;
Lin Qian
4College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
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Chen Xu;
Chen Xu
4College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
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Jun-peng Zhang
Jun-peng Zhang
4College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
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Water Supply (2016) 16 (1): 34–43.
Article history
Received:
May 12 2015
Accepted:
July 07 2015
Citation
Wei-ying Li, Yao Liu, Xiu-li Sun, Feng Wang, Lin Qian, Chen Xu, Jun-peng Zhang; Photocatalytic degradation of MC-LR in water by the UV/TiO2/H2O2 process. Water Supply 1 February 2016; 16 (1): 34–43. doi: https://doi.org/10.2166/ws.2015.110
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