Templated synthesis of TiO2 nanotube macrostructures and their photocatalytic properties

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• 作者：Hongbian Li (1)
  Qiaoyu Zhou (1)
  Yuntian Gao (2)
  Xuchun Gui (3)
  Long Yang (1)
  Mingde Du (1)
  Enzheng Shi (2)
  Jidong Shi (1)
  Anyuan Cao (2)
  Ying Fang (1)
  
  1. National Center for Nanoscience and Technology ; 11 Beiyitiao Street ; Zhongguancun ; Beijing ; 100190 ; China
  2. Department of Materials Science and Engineering ; College of Engineering ; Peking University ; Beijing ; 100871 ; China
  3. State Key Lab of Optoelectronic Materials and Technologies ; School of Physics and Engineering ; Sun Yat-sen University ; Guangzhou ; 510275 ; China
  
• 关键词：TiO2 nanotube ; macrostructure ; carbon nanotube sponge ; photocatalysis
• 刊名：Nano Research
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：8
• 期：3
• 页码：900-906
• 全文大小：2,085 KB
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• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chinese Library of Science
  Chemistry
  Nanotechnology
  
• 出版者：Tsinghua University Press, co-published with Springer-Verlag GmbH
• ISSN：1998-0000

文摘

Controlled synthesis of hierarchically assembled titanium dioxide (TiO2) nanostructures is important for practical applications in environmental purification and solar energy conversion. We present here the fabrication of interconnected TiO2 nanotubes as a macroscopic bulk material by using a porous carbon nanotube (CNT) sponge as a template. The basic idea is to uniformly coat an amorphous titania layer onto the CNT surface by the infiltration of a TiO2 precursor into the sponge followed by a subsequent hydrolysis process. After calcination, the CNTs are completely removed and the titania is simultaneously crystallized, which results in a porous macrostructure composed of interconnected anatase TiO2 nanotubes. The TiO2 nanotube macrostructures show comparable photocatalytic activities to commercial products (AEROXIDE TiO2 P25) for the degradation of rhodamine B (RhB). Moreover, the TiO2 nanotube macrostructures can be settled and separated from water within 12 h after photocatalysis, whereas P25 remains suspended in solution after weeks. Thus the TiO2 nanotube macrostructures offer the advantage of easy catalyst separation and recycle and can be a promising candidate for wastewater treatment.