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.
引用
收藏
页码:175 / 183
页数:9
相关论文
共 74 条
[1]   Hydrogen from photo-catalytic water splitting process: A review [J].
Ahmad, H. ;
Kamarudin, S. K. ;
Minggu, L. J. ;
Kassim, M. .
RENEWABLE & SUSTAINABLE ENERGY REVIEWS, 2015, 43 :599-610
[2]   Enhanced visible-light photocatalytic activity of g-C3N4/TiO2 films [J].
Boonprakob, Natkritta ;
Wetchakun, Natda ;
Phanichphant, Sukon ;
Waxler, David ;
Sherrell, Peter ;
Nattestad, Andrew ;
Chen, Jun ;
Inceesungvorn, Burapat .
JOURNAL OF COLLOID AND INTERFACE SCIENCE, 2014, 417 :402-409
[3]   Polymeric Photocatalysts Based on Graphitic Carbon Nitride [J].
Cao, Shaowen ;
Low, Jingxiang ;
Yu, Jiaguo ;
Jaroniec, Mietek .
ADVANCED MATERIALS, 2015, 27 (13) :2150-2176
[4]   In situ anion-exchange synthesis and photocatalytic activity of AgBr/Ag2O heterostructure [J].
Cao, Yuhui ;
Li, Qiuye ;
Xing, Yangyang ;
Zong, Lanlan ;
Yang, Jianjun .
APPLIED SURFACE SCIENCE, 2015, 341 :190-195
[5]   Photoactivity and stability of Ag2WO4 for organic degradation in aqueous suspensions [J].
Chen, Haihang ;
Xu, Yiming .
APPLIED SURFACE SCIENCE, 2014, 319 :319-323
[6]   Silver Molybdate and Silver Tungstate Nanocomposites with Enhanced Photoluminescence [J].
De Santana, Yuri V. B. ;
Cardoso Gomes, Jose Ernane ;
Matos, Leandro ;
Cruvinel, Guilherme Henrique ;
Perrin, Andre ;
Perrin, Christiane ;
Andres, Juan ;
Varela, Jose A. ;
Longo, Elson .
NANOMATERIALS AND NANOTECHNOLOGY, 2014, 4
[7]   In Situ Construction of g-C3N4/g-C3N4 Metal-Free Heterojunction for Enhanced Visible-Light Photocatalysis [J].
Dong, Fan ;
Zhao, Zaiwang ;
Xiong, Ting ;
Ni, Zilin ;
Zhang, Wendong ;
Sun, Yanjuan ;
Ho, Wing-Kei .
ACS APPLIED MATERIALS & INTERFACES, 2013, 5 (21) :11392-11401
[8]   Facile transformation of low cost thiourea into nitrogen-rich graphitic carbon nitride nanocatalyst with high visible light photocatalytic performance [J].
Dong, Fan ;
Sun, Yanjuan ;
Wu, Liwen ;
Fu, Min ;
Wu, Zhongbiao .
CATALYSIS SCIENCE & TECHNOLOGY, 2012, 2 (07) :1332-1335
[9]   Synthesis, photocatalytic and antimicrobial properties of SnO2, SnS2 and SnO2/SnS2 nanostructure [J].
Fakhri, Ali ;
Behrouz, Sajjad ;
Pourmand, Melika .
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY, 2015, 149 :45-50
[10]   Selected perovskite oxides: Characterization, preparation and photocatalytic properties-A review [J].
Grabowska, Ewelina .
APPLIED CATALYSIS B-ENVIRONMENTAL, 2016, 186 :97-126