Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 218, Issue -, Pages 111-118Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2017.03.084
Keywords
Bi quantum dots; Photocatalytic bromate reduction; Visible light; Hole trapping/consumption center; Charge carrier separation
Funding
- National Natural Science Foundation of China [51672283, 51602316]
- Basic Science Innovation Program of Shenyang National Laboratory for Materials Science [Y4N56R1161, Y5N56F2161]
- Geping Green Action-123 Project on Environment Research and Education of Liaoning Province [CEPF2014-123-1-4]
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Bi quantum dots were deposited onto rutile TiO2 nanoparticles by a one-pot, solvent-thermal process to create the Bi/TiO2 (rutile) heterojunction photocatalyst. Due to the specific semimetal property of Bi, a metal to semiconductor transition occurred for Bi quantum dots, which endowed them with the hole trapping capability to enhance the charge carrier separation in rutile TiO2 and eliminate the need of sacrificial agents for the consumption of photogenerated holes in photocatalytic reduction process. The Bi/TiO2 (rutile) heterojunction photocatalyst demonstrated an efficient photocatalytic bromate reduction under visible light illumination without the addition of sacrificial agents in the reaction solution, and it could be easily regenerated for reuse. Different with previously reported noble/transition metal modifications as the electron trapping center, this study demonstrated a novel material design strategy of the introduction of hole trapping centers to create photocatalysts with strong photocatalytic reduction capabilities, which could be readily adopted for a broad range of technical applications. (C) 2017 Elsevier B.V. All rights reserved.
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