Journal
CATALYSIS TODAY
Volume 327, Issue -, Pages 288-294Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cattod.2018.04.037
Keywords
Coral-like Bi2WO6; Visible-light photocatalysis; Photogenerated electron modulation; Charge separation; 2,4-Dichlorophenol degradation
Funding
- NSFC project [U1401245, 21501052, 91622119]
- Program for Innovative Research Team in Chinese Universities [IRT1237]
- China Postdoctoral Science Foundation [2015M570304]
- Special Funding for Postdoctoral of Heilongjiang Province [LBH-TZ06019]
- Science Foundation for Excellent Youth of Harbin City of China [2014RFYXJ002, 2016RQQXJ099]
- [UNPYSCT-2016173]
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It is essential to improve the activity of Bi2WO6 for the photocatalytic 2,4-dichlorophenol (2,4-DCP) degradation by modulating the visible-light excited photogenerated electrons. As for this, Bi2WO6 nanostructures have been synthesized by a mannitol assistant hydrothermal method. It is shown that the temperature-optimized Bi2WO6 exhibits high photocatalytic activity for 2,4-DCP degradation under visible-light irradiation, attributed to the coral-like structure, high crystallinity and large surface area. Interestingly, the photocatalytic activities of coral-like Bi2WO6 could be further improved by coupling ultrafine nanocrystalline SnO2. It is confirmed mainly from the steady-state and transient-state surface photovoltage responses and fluorescence spectra related to the formed hydroxyl radical amounts that the coupled SnO2 is taken as a proper energy platform to accept the visible-light excited high-energy-level photogenerated electrons from Bi2WO6, consequently enhancing the charge separation and prolonging the charge lifetime. Moreover, the optimized SnO2-coupled BWO exhibits higher photocatalytic activity under UV-vis light irradiation than the commercial P25 TiO2. This work will provide a new feasible route to prepare highly efficient Bi2WO6-based photocatalysts for purifying chlorophenol-polluted water environments.
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