Facile synthesis of Cu_xO (x = 1, 2)/TiO₂ nanotube arrays as an efficient visible-light driven photocatalysts

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• 作者：Huirong Li ; Jie Zhou ; Bo Feng
• 关键词：TiO2 nanotube arrays ; CuxO modification ; Photocatalytic activity
• 刊名：Journal of Porous Materials
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：24
• 期：1
• 页码：97-102
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Catalysis; Characterization and Evaluation of Materials; Physical Chemistry;
• 出版者：Springer US
• ISSN：1573-4854
• 卷排序：24

文摘

TiO₂ nanotube arrays (TNTs) modified with Cu_xO (x = 1, 2) were prepared by a simple impregnation-calcinations method. The obtained samples were characterized by field emission scanning electron microscopy, transmission electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy , UV–Vis diffuse reflectance spectroscopy and photocurrent tests. The photocatalytic ability of the as-prepared photocatalysts was evaluated using rhodamine B (RhB) as a target pollutant. Compared with pure TNTs, the Cu_xO/TNTs composite exhibited much higher photocatalytic activity under visible-light irradiation (λ > 420 nm). The photocatalytic activity of the composite was related to impregnation time of the copper nitrate solution, and an optimal time was 2 h. The activity of 2-Cu_xO/TNTs displayed 4.9 times as high as that of pure TNTs. The enhanced photocatalytic performance is mainly attributed to the synergistic effects of initiating visible-light absorption and the matched band edge positions of Cu₂O, CuO and TiO₂. Also, a possible mechanism on the Cu_xO/TNTs photocatalytic degradation of RhB is proposed. Overall, the inexpensive and environmentally friendly photocatalyst, as promising materials, could be used to remove some aquatic pollutants in the field of water purification.