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Fabrication and photocatalytic activity enhanced mechanism of direct Z-scheme g-C3N4/Ag2WO4 photocatalyst
被引:659
作者:
Zhu, Bicheng
[1
,2
]
Xia, Pengfei
[1
]
Li, Yao
[1
]
Ho, Wingkei
[2
]
Yu, Jiaguo
[1
,3
]
机构:
[1] Wuhan Univ Technol, State Key Lab Adv Technol Mat Synth & Proc, Wuhan 430070, Peoples R China
[2] Hong Kong Inst Educ, Dept Sci & Environm Studies, Tai Po, Hong Kong, Peoples R China
[3] King Abdulaziz Univ, Dept Phys, Fac Sci, Jeddah 21589, Saudi Arabia
基金:
中国国家自然科学基金;
关键词:
Direct Z-scheme;
g-C-3;
N-4;
beta-Ag2WO4;
Methyl orange;
Degradation;
GRAPHITIC CARBON NITRIDE;
GRAPHENE-BASED PHOTOCATALYSTS;
VISIBLE-LIGHT IRRADIATION;
CO2;
REDUCTION;
HYDROGEN EVOLUTION;
SILVER TUNGSTATE;
FACILE SYNTHESIS;
PHOTOELECTROCHEMICAL PROPERTIES;
HETEROJUNCTION PHOTOCATALYST;
SOLAR-FUEL;
D O I:
10.1016/j.apsusc.2016.07.104
中图分类号:
O64 [物理化学(理论化学)、化学物理学];
学科分类号:
070304 ;
081704 ;
摘要:
Herein, a direct Z-scheme graphitic carbon nitride (g-C3N4)/silver tungstate (Ag2WO4) photocatalyst was prepared by a facile in situ precipitation method using g-C3N4 as a support and silver nitrate as a precursor. X-ray diffraction, Fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, and elemental mapping demonstrated that beta-Ag2WO4 nanoparticles were evenly distributed on the surface of g-C3N4 nanosheets, which acted as a support for the nucleation and growth of beta-Ag2WO4 and inhibited the phase transformation of metastable beta-Ag2WO4 to stable alpha-Ag2WO4. Photocatalytic experiments indicated that the g-C3N4/Ag2WO4 nanocomposite photocatalyst displayed a better photocatalytic activity than pure g-C3N4 and Ag2WO4 toward the degradation of methyl orange. The enhanced photocatalytic performance of g-C3N4/Ag2WO4 could be well explained by a direct Z-scheme photocatalytic mechanism. This mechanism was related to the efficient space separation of photogenerated electron-hole pairs and the great oxidation and reduction capabilities of the g-C3N4/Ag2WO4 system. This work provided new insights into the design and fabrication of g-C3N4-based direct Z-scheme photocatalysts. (C) 2016 Elsevier B.V. All rights reserved.
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页码:175 / 183
页数:9
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