Journal
CHEMICAL PAPERS
Volume 72, Issue 2, Pages 359-368Publisher
SPRINGER INTERNATIONAL PUBLISHING AG
DOI: 10.1007/s11696-017-0285-6
Keywords
TiO2 nanotube arrays; Photoanode; Photocatalysis; Ofloxacin; Reactive species; Degradation pathways; Recyclability
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Funding
- National Natural Science Foundation of China [51108481]
- National Water Pollution Control and Treatment Science and Technology Major Project [2012ZX07102001-003]
- Fundamental Research Funds for the Central Universities [106112016CDJXY210008]
- Foundation and Frontier Research General Project of Chongqing, China [cstc2017jcyjAX0206]
- Chongqing University Postgraduates Innovation Project [CYB15039]
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The degradation of ofloxacin (OFX) at low concentration in aqueous solution by UVA-LED/TiO2 nanotube arrays photocatalytic fuel cells (UVA-LED/TiO2 NTs PFCs) was investigated. TiO2 nanotube arrays (TiO2 NTs) photoanode prepared by anodization-constituted anatase-rutile bicrystalline framework. The results indicated that the degradation efficiency of OFX by UVA-LED/TiO2 NTs PFC was significantly enhanced by 14.3% compared with UVA-LED/TiO2 NTs photocatalysis. The pH affected the degradation efficiency markedly; the highest degradation efficiency (95.0%) and the pseudo-first-order reaction rate constant k value (0.049 min(-1)) were achieved in neutral condition (pH 7.0). The degradation efficiency increased with the increasing concentration of dissolved oxygen (DO) in the UVA-LED/TiO2 NTs PFC. The main reactive species of OFX degradation are positive holes (h(+)) and superoxide ion radicals (O-2(center dot-)) in a DO sufficient condition. Furthermore, the possible pathways of OFX degradation were proposed.
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