期刊
APPLIED SURFACE SCIENCE
卷 430, 期 -, 页码 234-242出版社
ELSEVIER
DOI: 10.1016/j.apsusc.2017.08.042
关键词
MoS2 QDs; g-C3N4; Ag nanoparticles; Visible light; Photocatalysis
类别
资金
- National Natural Science Foundation of China [51672113]
- Qing Lan Project Foundation of Jiangsu Province
- State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology [2016-KF-10]
A novel MoS2 quantum dots (QDs) decorated g-C3N4/Ag heterostructured photocatalyst has been synthesized via a two-step method including in situ microemulsion-assisted reduction and wetness impregnation method. The obtained heterostructure photocatalyst was characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), UV-vis diffuse reflectance spectroscopy (DRS) and photoluminescence spectrosxopy (PL). The photocatalytic activity was evaluated by the degradation of methyl orange (MO) under visible-light irradiation. The MoS2 QDs decorated hybrid photocatalysts exhibited significantly enhanced photocatalytic performance. The concentration of Ag and MoS2 QDs showing the optimal photocatalytic performance was determined to be 10% and 0.3% respectively, which exceeded the photocatalytic performance of pure g-C3N4 by more than 4.7 times. Recycling experiments confirmed that the hybrid catalysts had superior cycle performance and stability. The enhanced photocatalytic activity of MoS2 QDs decorated g-C3N4/Ag hybrid photocatalysts can be mainly ascribed to enhanced visible-light absorption, the efficient separation of photogenerated charge carriers and the stronger oxidation and reduction ability through a Z-scheme system composed of g-C3N4, Ag and MoS2 QDs, in which Ag nanoparticles act as the charge separation center. The evidence of the Z-scheme photocatalytic mechanism of the composite photocatalysts was obtained from the active species trapping experiments. (C) 2017 Elsevier B.V. All rights reserved.
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