期刊
MATERIALS RESEARCH BULLETIN
卷 101, 期 -, 页码 20-28出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2018.01.007
关键词
alpha-Fe2O3@CeO2; Visible-light harvesting; Core-shell structure; Heterojunction interfaces
资金
- National Natural Science Foundation of China [21506103, 51608512]
- Science and Technology Support Program of Sichuan Province [2015GZ0170]
- Major Training Program of the Education Department of Sichuan Province [15CZ0026, 17CZ0019]
- Science Foundation of the Education Department of Sichuan Province [17ZA0221]
CeO2-coated alpha-Fe2O3 nanoparticles (alpha-Fe2O3@CeO2) with the enhanced photocatalytic activity were synthesized by a hydrothermal route and performed for the visible light driven photo-degradation of methylene blue (MB). The photocatalytic activity of alpha-Fe2O3@CeO2 is greatly affected by the thickness of CeO2 shell under the same conditions. The core-shell structured alpha-Fe2O3@CeO2 sample exhibited a narrower band gap energy in comparison to the pure alpha-Fe2O3 and CeO2 bulks, leading to the excellent photocatalytic activity and stability for the degradation of MB under visible light irradiation after five cycle times. The core-shell structured alpha-Fe2O3@CeO2 sample presented higher degradation activity than that of the supported 8-Fe/CeO2 bulks with optimized alpha-Fe2O3 loading of 8%. It can be ascribed to the Ce4+/Ce3+ redox couple and the heterojunction interfaces of core-shell structured alpha-Fe2O3@CeO2 sample, which can promote the electrons transfer and restrain the photoexcited electron-hole recombination, leading to the excellent degradation activity under visible light irradiation.
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