Citation: Yanhui Fu, Zhijun Li, Qinqin Liu, Xiaofei Yang, Hua Tang. Construction of carbon nitride and MoS₂ quantum dot 2D/0D hybrid photocatalyst: Direct Z-scheme mechanism for improved photocatalytic activity[J]. Chinese Journal of Catalysis, ;2017, 38(12): 2160-2170. doi: 10.1016/S1872-2067(17)62911-5 shu

Construction of carbon nitride and MoS₂ quantum dot 2D/0D hybrid photocatalyst: Direct Z-scheme mechanism for improved photocatalytic activity

School of Materials Science and Engineering, Jiangsu University, Zhenjiang, 212013, Jiangsu, China

Received Date: 28 August 2017
Revised Date: 8 September 2017

Fund Project: This work was supported by National Natural Science Foundation of China (51672113), Six Talent Peaks Project in Jiangsu Province (2015-XCL-026), Natural Science Foundation of Jiangsu Province (BK20171299), State Key Laboratory of Photocatalysis on Energy and Environment (SKLPEE-KF201705), Fuzhou University, and State Key Laboratory of Advanced Technology for Materials Synthesis and Processing (2016-KF-10), Wuhan University of Technology, and the QingLan Project Foundation of Jiangsu Province.

Graphite-like carbon nitride (g-C₃N₄)-based compounds have attracted considerable attention because of their excellent photocatalytic performance. In this work, a novel direct Z-scheme system constructed from two-dimensional (2D) g-C₃N₄ nanoplates and zero-dimensional (0D) MoS₂ quantum dots (QDs) was prepared through the combination of a hydrothermal process and microemulsion preparation. The morphologies, structures, and optical properties of the as-prepared photocatalysts were characterized by X-ray diffraction, X-ray photoelectron spectroscopy, atomic force microscopy, transmission electron microscopy, and UV-vis diffuse reflectance spectroscopy. In addition, the photocatalytic performances of the prepared 2D/0D hybrid composites were evaluated based on the photodegradation of rhodamine B under visible-light irradiation. The results demonstrated that the introduction of MoS₂ QDs to g-C₃N₄ greatly enhanced the photocatalytic efficiency. For the optimum 7% MoS₂ QD/g-C₃N₄ photocatalyst, the degradation rate constant was 8.8 times greater than that of pure g-C₃N₄ under visible-light irradiation. Photocurrent and electrochemical impedance spectroscopy results further demonstrated that the MoS₂ QD/g-C₃N₄ composites exhibited higher photocurrent density and lower chargetransfer resistance than those of the pure g-C₃N₄ or MoS₂ QDs. Active species trapping, terephthalic acid photoluminescence, and nitro blue tetrazolium transformation experiments were performed to investigate the evolution of reactive oxygen species, including hydroxyl radicals and superoxide radicals. The possible enhanced photocatalytic mechanism was attributed to a direct Z-scheme system, which not only can increase the separation efficiency of photogenerated electron-hole pairs but also possesses excellent oxidation and reduction ability for high photocatalytic performances. This work provides an effective synthesis approach and insight to help develop other C₃N₄-based direct Z-scheme photocatalytic systems for environmental purification and energy conversion.
- Photocatalysis,
- Direct Z-scheme,
- Two-dimensional (2D),
- Zero-dimensional (0D),
- g-C₃N₄,
- MoS₂ quantum dots
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Construction of carbon nitride and MoS2 quantum dot 2D/0D hybrid photocatalyst: Direct Z-scheme mechanism for improved photocatalytic activity

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通讯作者: 陈斌, bchen63@163.com

Construction of carbon nitride and MoS₂ quantum dot 2D/0D hybrid photocatalyst: Direct Z-scheme mechanism for improved photocatalytic activity