期刊
JOURNAL OF COLLOID AND INTERFACE SCIENCE
卷 400, 期 -, 页码 18-23出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2013.02.046
关键词
ZnO; Doping; Photocatalysts; Visible light
资金
- Major Basic Research Program, Ministry of Science and Technology of China [2009CB220001]
- NSFC [50921004, 51002160, 21090343, 51172243, 51202255]
- Solar Energy Initiative
- Chinese Academy of Sciences [KJCX2-YW-H21-01]
Increasing visible light absorption of wide-bandgap photocatalysts (for example, ZnO and TiO2) plays a pivotal role in improving their photocatalytic activity. In this work, we show that substitutional nitrogen doping can be realized in semi-crystalline zinc oxide (ZnO) nanoparticles but fails for highly crystalline ZnO by heating the ZnO at a temperature of 400 degrees C in gaseous ammonia atmosphere. The results suggest that substitutional nitrogen for lattice oxygen is strongly dependent on the crystallinity of ZnO. The nitrogen doped ZnO obtained shows an improved visible light photocatalytic activity in the degradation of organic dyes due to its increased visible light absorption. The origin of the increased visible light absorption is theoretically attributed to the formed N 2p localized states in the bandgap. (C) 2013 Elsevier Inc. All rights reserved.
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