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Degradation of ofloxacin by UVA-LED/TiO2 nanotube arrays photocatalytic fuel cells

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Abstract

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 ) in a DO sufficient condition. Furthermore, the possible pathways of OFX degradation were proposed.

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Acknowledgements

Supports for this research were provided by the National Natural Science Foundation of China (No. 51108481), National Water Pollution Control and Treatment Science and Technology Major Project (No. 2012ZX07102001-003), Fundamental Research Funds for the Central Universities (No. 106112016CDJXY210008), Foundation and Frontier Research General Project of Chongqing, China (No. cstc2017jcyjAX0206) and Chongqing University Postgraduates Innovation Project (No. CYB15039).

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  1. Key Laboratory of the Three Gorges Reservoir Regions Eco-Environment, Ministry of Education, Chongqing University, Shabei st.83, Chongqing, 400045, China

    Bin Xia, Juan-juan Yao, Chen-xi Han, Zhi Zhang, Xiang-yu Chen & Yan-juan Fang

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  1. Bin Xia
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  2. Juan-juan Yao
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Correspondence to Juan-juan Yao.

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Xia, B., Yao, Jj., Han, Cx. et al. Degradation of ofloxacin by UVA-LED/TiO2 nanotube arrays photocatalytic fuel cells. Chem. Pap. 72, 359–368 (2018). https://doi.org/10.1007/s11696-017-0285-6

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