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Enhanced visible-light activities of porous BiFeO3 by coupling with nanocrystalline TiO2 and mechanism

Paper ID Volume ID Publish Year Pages File Format Full-Text
45237 46407 2016 8 PDF Available
Title
Enhanced visible-light activities of porous BiFeO3 by coupling with nanocrystalline TiO2 and mechanism
Abstract

•TiO2/porous BiFeO3 nanocomposites were successfully fabricated by a wet-chemical process.•The fabricated nanocomposite shows higher charge separation than porous BiFeO3 alone.•This leads to superior visible-light activities for degrading pollutants and producing H2.•Promoted charge separation is attributed to transfer of visible-excited energetic electrons to TiO2.

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 sol, followed by drying at 80 °C and then calcining at 450 °C for 2 h. The photoactivities of the obtained products for pollutant degradation and H2 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 H2 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/P-BFO nanocomposite is mainly attributed to the spatial transfer of visible-light-excited (λ ≤ 500 nm) high-energy 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.

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Keywords
Porous BiFeO3; Coupling TiO2; Charge transfer and separation; Visible photocatalysis; Pollutant degradation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 180, January 2016, Pages 219–226
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us