Journal
APPLIED SURFACE SCIENCE
Volume 355, Issue -, Pages 379-387Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2015.07.111
Keywords
Porous; Graphitic carbon nitride; Ultrathin nanosheets; Bi2WO6 QDs; Z-scheme
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Funding
- National Natural Science Foundation of China [51272107, 51372118]
- Jiangsu Funds for Distinguished Young Scientists [BK2012035]
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The use of solar energy is a promising means for pollution abatement or environmental remediation. In the present work, we report the design and fabrication of Bi2WO6 QDs/g-C3N4 binary heterojunction photocatalysts with highly efficient solar light response, wherein the Bi2WO6 QDs were in situ uniformly immobilized on porous g-C3N4 ultrathin nanosheets (NSs) by one-pot hydrothermal strategy. The photocatalytic performance of the Bi2WO6 QDs/g-C3N4 NSs hybrid composites was evaluated for the photodegradation of Rhodamine B (RhB). It was found that the mass ratio of Bi2WO6 QDs to g-C3N4 nanosheets in the composites significantly affects the photocatalytic activity. Higher amounts of g-C3N4 nanosheets in Bi2WO6 QDs/g-C3N4 composites showed lower photocatalytic activity. The composite with 10 mg g-C3N4 nanosheets exhibited the highest photocatalytic activity, with nearly 11-fold enhancement in photocatalytic efficiency over pure Bi2WO6 QDs. Different from previous reports, a novel Z-scheme photocatalytic mechanism was proposed to explain the enhanced the photocatalytic efficiency. (c) 2015 Elsevier B.V. All rights reserved.
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