Journal
JOURNAL OF PHYSICS D-APPLIED PHYSICS
Volume 52, Issue 8, Pages -Publisher
IOP Publishing Ltd
DOI: 10.1088/1361-6463/aaf4e2
Keywords
2D/2D; nanosheet heterojunction; BI2MoO6/g-C3N4; visible light photocatalysis; Z-scheme
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Funding
- National Natural Science Foundation of China [51508254, 41771341]
- Fundamental Research Funds for the Central Universities [lzujbky-2017-it98]
- National College Student Innovation and Entrepreneurship Training Program of Lanzhou University
- Key Laboratory of Comprehensive and Highly Efficient Utilization of Salt Lake Resources, Qinghai Institute of Salt Lake, Chinese Academy of Sciences
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In this study, a novel 2D Bi2MoO6 nanosheet/2D g-C3N4 nanosheet heterojunction composite was fabricated through a hydrothermal strategy. Afterwards, physicochemical properties of the composite were systematically detected by a series of measurements. In addition, photocatalytic activity was evaluated by the degradation of rhodamine B, methylene blue, Amido black 10B and malachite green. The results showed that Bi2MoO6/g-C3N4 possessed higher photocatalytic efficiency than that of the pristine Bi2MoO6 and g-C3N4 sample under visible irradiation. This phenomenon could be attributed to the combination of Bi2MoO6 and g-C3N4 as well as the unique 2D/2D heterostructure. Also, the as-fabricated Bi2MoO6/g-C3N4 composite possessed higher surface area, narrower bandgap energy, larger electron transport capability and longer charge carrier lifetime. Furthermore, the enhanced visible-light-driven photocatalytic mechanism was proposed and confirmed, which was mainly ascribed to the Z-scheme structure. That is, the photogenerated electrons (e(-)) in the conduction band (CB) of Bi2MoO6 and photogenerated holes (h(+)) in the valence band (VB) of g-C3N4 could combine with each other quickly, so that the e(-) in the CB of g-C3N4 and h(+) in the VB of Bi2MoO6 participated in reduction and oxidation reactions, respectively. Also, this composite exhibited superior physicochemical stability. Hence, it could be applied in advanced wastewater treatment.
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