期刊
SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS
卷 16, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1468-6996/16/1/014801
关键词
alpha-Fe2O3; microwave-assisted synthesis; photocatalytic activity; active species
资金
- Early Career Scheme of the Research Grants Council of Hong Kong SAR, China [CityU 9041977]
- Science Technology and Innovation Committee of Shenzhen Municipality [R-IND4901]
- City University of Hong Kong
Intrinsic short hole diffusion length is a well-known problem for alpha-Fe2O3 as a visible-light photocatalytic material. In this paper, a nanodisk morphology was designed to remarkably enhance separation of electron-hole pairs of alpha-Fe2O3. As expected, alpha-Fe2O3 nanodisks presented superior photocatalytic activity toward methylene blue degradation: more than 90% of the dye could be photodegraded within 30 min in comparison with a degradation efficiency of 50% for conventional Fe2O3 powder. The unique multilayer structure is thought to play a key role in the remarkably improved photocatalytic performance. Further experiments involving mechanism investigations revealed that instead of high surface area, center dot OH plays a crucial role in methylene blue degradation and that O-center dot 2-may also contribute effectively to the degradation process. This paper demonstrates a facile and energy-saving route to fabricating homogenous alpha-Fe2O3 nanodisks with superior photocatalytic activity that is suitable for the treatment of contaminated water and that meets the requirement of mass production.
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