Fabrication of plasmonic Au/TiO2 nanotube arrays with enhanced photoelectrocatalytic activities |
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| Affiliation: | 1. School of Chemical Engineering, Northwest University, Xi''an 710069, PR China;2. School of Physics, Northwest University, Xi''an 710069, PR China;1. Department of Agricultural Chemistry, National Taiwan University, Taipei 106, Taiwan;2. Department of Architecture and Civil Engineering, City University of Hong Kong, Hong Kong;3. Department of Environmental Engineering, Van Nung University, No.1, Van Nung Rd., Chung-Li, Tao-yuan 326, Taiwan;4. City University of Hong Kong Shenzhen Research Institute, Shenzhen, China;1. Department of Chemical and Materials Engineering, National Central University, No. 300, Zhongda Road, Zhongli District, Taoyuan 32001, Taiwan;2. Department of Safety, Health and Environmental Engineering, Hungkuang University, No. 1018, Sec. 6, Taiwan Boulevard, Shalu District, Taichung 43302, Taiwan;1. Faculty of Engineering, Department of Chemical Engineering, Ataturk University, 25240 Erzurum, Turkey;2. Faculty of Engineering, Department of Chemical Engineering, Yıldız Technical University, İstanbul, Turkey;1. School of Chemical Science and Engineering, Shanghai Key Lab of Chemical Assessment and Sustainability, Key Laboratory of Yangtze River Water Environment, Tongji University, Shanghai 200092, People’s Republic of China;2. College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, People’s Republic of China;1. School of Environmental Science, Henan Normal University, Key Laboratory for Yellow River and Huaihe River Water Environment and Pollution Control, Ministry of Education, Henan Key Laboratory for Environmental Pollution Control, Xinxiang 453007, PR China;2. College of Fisheries, Henan Normal University, Xinxiang 453007, PR China;3. Faculty of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou 510006, PR China;4. English North East Ltd., Durham SR8 5TE, UK |
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| Abstract: | Uniformly dispersed Au nanoparticles (NPs) deposited on the surface of highly ordered TiO2 nanotube arrays (Au/TiO2 NTs) were synthesized through a two-step process including anodization method and microwave-assisted chemical reduction route. The investigation indicated that Au NPs grew uniformly on the walls of TiO2 NTs. Au/TiO2 NTs exhibited excellent visible light absorption due to the LSPR effect of Au NPs. Au/TiO2 NTs exhibited much higher photocurrent density and the photoconversion efficiency of Au decorated TiO2 NTs was about 2.05 times greater than that of bare TiO2 NTs. Besides, the PL intensity of Au/TiO2 NTs was much lower than that of TiO2 NTs, revealing a decrease in charge carrier recombination. The prepared Au/TiO2 NTs exhibited superior photoelectrocatalytic activity and stability in the degradation of MB under simulated solar light irradiation. The synergy effect between nanotubular structures of TiO2 and uniformly dispersed Au nanoparticles, as well as the small bias potential and strong interaction between Au and TiO2, facilitated the Au plasmon-induced charge separation and transfer, which lead to highly efficient and stable photoelectrocatalytic activity. |
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| Keywords: | Au nanoparticles Photoelectrocatalytic Plasmon Environmental remediation |
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