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International Journal of Photoenergy
Volume 2014, Article ID 724910, 9 pages
Research Article

Sol-Gel to Prepare Nitrogen Doped TiO2 Nanocrystals with Exposed {001} Facets and High Visible-Light Photocatalytic Performance

1Key Laboratory of Urban Environment and Health, Institute of Urban Environment, Chinese Academy of Sciences, No. 1799, Jimei Road, Xiamen, Fujian 361021, China
2China National Petroleum Offshore Engineering Co., Ltd., Beijing 100028, China

Received 1 April 2014; Revised 3 June 2014; Accepted 17 June 2014; Published 7 July 2014

Academic Editor: Qing Wang

Copyright © 2014 Hui-Ying Ai 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.


A series of N-doped TiO2 nanocrystals with exposed facets was prepared successfully by sol-gel method for the first time. The physicochemical properties of these resultant photocatalysts were characterized by XRD, TEM, XPS, and DRS, and their photocatalytic performances were evaluated by photocatalytic decoloration of methylene blue solution under visible light ( nm) irradiation. The results showed that the N-doped TiO2 nanocrystals with exposed facets showed higher photocatalytic activity than P25. The enhanced photocatalytic performance can be attributed to synergistic effects of several factors, such as good crystallinity, better light response characteristic, and high reactivity of facets.