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

作者：Xia, Bin; Yao, Juan-juan^*; Han, Chen-xi; Zhang, Zhi; Chen, Xiang-yu; Fang, Yan-juan

来源：CHEMICAL PAPERS, 2018, 72(2): 359-368.

DOI：10.1007/s11696-017-0285-6

• TiO2 nanotube arrays
• Photoanode
• Photocatalysis
• Ofloxacin
• Reactive species
• Degradation pathways
• Recyclability

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.

• 出版日期2018-2
• 单位重庆大学