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International Journal of Photoenergy
Volume 2014, Article ID 563879, 14 pages
http://dx.doi.org/10.1155/2014/563879
Review Article

One-Dimensional Nanostructured TiO2 for Photocatalytic Degradation of Organic Pollutants in Wastewater

1School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
2College of Materials, Optoelectronics and Physics, Xiangtan University, Xiangtan, Hunan 411105, China
3Department of Materials Science and Engineering, NUSNNI-NanoCore, National University of Singapore, Singapore 117576

Received 4 April 2014; Revised 12 June 2014; Accepted 23 June 2014; Published 5 August 2014

Academic Editor: Xiwang Zhang

Copyright © 2014 Ting Feng et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The present paper reviews the progress in the synthesis of one-dimensional (1D) TiO2 nanostructures and their environmental applications in the removal of organic pollutants. According to the shape, 1D TiO2 nanostructures can be divided into nanorods, nanotubes, nanowires/nanofibers, and nanobelts. Each of them can be synthesized via different technologies, such as sol-gel template method, chemical vapor deposition, and hydrothermal method. These methods are discussed in this paper, and the recent development of the synthesis technologies is also presented. Furthermore, the organic pollutants, degradation using the synthesized 1D TiO2 nanostructures is studied as an important application of photocatalytic oxidation (PCO). The 1D nanostructured TiO2 exhibited excellent photocatalytic activity in a PCO process, and the mechanism of photocatalytic degradation of organic pollutants is also discussed. Moreover, the modification of 1D TiO2 nanostructures using metal ions, metal oxide, or inorganic element can further enhance the photocatalytic activity of the photocatalyst. This phenomenon can be explained by the suppression of e-h+ pairs recombination rate, increased specific surface area, and reduction of band gap. In addition, 1D nanostructured TiO2 can be further constructed as a film or membrane, which may extend its practical applications.