Investigation of the effects of humic acid and H2O2 on the photocatalytic degradation of atrazine assisted by microwave |
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| Authors: | Chao Qin Shaogui Yang Cheng Sun Manjun Zhan Rongjun Wang Huanxing Cai and Jia Zhou |
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| Institution: | (1) Chemistry Department, Florida Institute of Technology, 150 West University Boulevard, Melbourne, FL 32901, USA;(2) Department of Civil and Environmental Engineering, Imperial College London, South Kensington Campus, London, SW7 2AZ, UK;(3) Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hong Kong, China;(4) State Key Laboratory Breeding Base of Photocatalysis, Department of Environmental Science and Engineering, Fuzhou University, Fuzhou, Fujian, 350108, China |
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| Abstract: | A solution of atrazine in a TiO2 suspension, an endocrine disruptor in natural water, was tentatively treated by microwave-assisted photocatalytic technique.
The effects of mannitol, oxygen, humic acid, and hydrogen dioxide on the photodegradation rate were explored. The results
could be deduced as follows: the photocatalytic degradation of atrazine fits the pseudo-first-order kinetic well with k = 0.0328 s?1, and ·OH was identified as the dominant reactant. Photodegradation of atrazine was hindered in the presence of humic acid,
and the retardation effect increased as the concentration of humic acid increased. H2O2 displayed a significant negative influence on atrazine photocatalysis efficiency. Based on intermediates identified with
gas chromatography-mass spectrometry (GC-MS) and Liquid chromatography-mass spectrometry (LC-MS/MS) techniques, the main degradation
routes of atrazine are proposed. |
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