TiO2 nanotube/ZnO nanorod/CdS on Ti mesh with three-dimensional array structure for photocatalytic degradation under visible light irradiation

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• 作者：Liangpeng Wu ; Mingyue Zhang ; Juan Li ; Chaoping Cen…
• 关键词：Ti mesh ; TiO2 nanotube ; ZnO nanorod arrays ; CdS ; Photocatalytic activity
• 刊名：Research on Chemical Intermediates
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：42
• 期：5
• 页码：4569-4580
• 全文大小：1,371 KB
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• 作者单位：Liangpeng Wu (1)
  Mingyue Zhang (2)
  Juan Li (1)
  Chaoping Cen (3)
  Xinjun Li (1)
  
  1. Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou, 510640, People’s Republic of China
  2. Department of Chemical Engineering, Guangdong Industry Technical College, Guangzhou, 510030, People’s Republic of China
  3. The Key Laboratory of Water and Air Pollution Control of Guangdong Province, South China Institute of Environmental Science, Ministry of Environmental Protection, Guangzhou, 510655, People’s Republic of China
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Catalysis
  Physical Chemistry
  Inorganic Chemistry
  
• 出版者：Springer Netherlands
• ISSN：1568-5675

文摘

The three-dimensional (3D) TiO₂ nanotube arrays (TNTA) were prepared by electrochemical anodization of Ti mesh in a mixed electrolyte solution of (NH₄)₂SO₄ and NH₄F. Well-defined CdS-sensitized ZnO nanorod arrays (ZNRA/CdS) were successfully built on TNTA by the hydrothermal method and chemical bath deposition. The as-prepared samples were characterized by means of XRD, FESEM, and UV–Vis. The photocatalytic activities of the samples were evaluated by measuring the photodegradation of methylene blue (MB) in aqueous solution under visible light irradiation. The photocatalytic efficiencies for MB degradation were 49 and 60 % for Ti mesh/ZNRA/CdS and Ti mesh/TNTA/ZNRA/CdS after irradiation for 6 h, respectively. This can be attributed to the presence of TNTA at the bottom of a ZNRA/CdS composite, which provides a direct pathway for photoinjected electrons transferring along the photoanode to enhance charge-collection efficiency and consequently reduce electron–hole recombination. Furthermore, it can enlarge the practical applications range of TiO₂ due to its 3D nanoarray structure with good light-harvesting ability and flexibility.