期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 180, 期 -, 页码 219-226出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2015.06.035
关键词
Porous BiFeO3; Coupling TiO2; Charge transfer and separation; Visible photocatalysis; Pollutant degradation
资金
- key NSFC project [U1401245]
- National Key Basic Research Program of China [2014CB660814]
- Program for Innovative Research Team in Chinese Universities [IRT1237]
- Research Project of Chinese Ministry of Education [213011A]
- Specialized Research Fund for the Doctoral Program of Higher Education [20122301110002]
- Science Foundation for Excellent Youth of Harbin City of China [2014RFYXJ002]
- Chinese government scholarship program for international students
In this work, different mole ratio percentage of nanocrystalline anatase TiO2/porous nanosized BiFeO3 (T/P-BFO) nanocomposites with effective contacts have been fabricated by putting the as-prepared P-BFO into the TiO2 sal, followed by drying at 80 degrees C and then calcining at 450 degrees C for 2 h. The photoactivities of the obtained products for pollutant degradation and H-2 evolution were measured. It is clearly demonstrated by means of the steady-state surface photo-voltage spectra, the transient-state surface photovoltage responses, and the photoluminescence spectra that the photogenerated charge carriers in the T/P-BFO nanocomposites with a proper mole ratio percentage of TiO2 (9%) display much long lifetime and high separation in comparison to the resulting P-BFO alone. This is well responsible for the enhanced activities for degrading gas-phase acetyldehyde, the liquid-phase phenol, and for producing H-2 under visible-light irradiation. Based on the measurements of formed hydroxyl radical amount and photoelectrochemical behavior, it is suggested that the improved separation of photogenerated charges in the fabricated T/PBFO nanocomposite is mainly attributed to the spatial transfer of visible-light-excited (X < 500 nm) highenergy electrons of P-BFO to TiO2. This work will provide a feasible route to enhance the photoactivities of visible-light responsive oxide composites as photocatalysts for efficient solar energy utilization. (C) 2015 Elsevier B.V. All rights reserved.
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