Z-scheme N-doped K4Nb6O17/g-C3N4 heterojunction with superior visible-light-driven photocatalytic activity for organic pollutant removal and hydrogen production

被引:119
作者
Liu, Chao [1 ,2 ,3 ]
Feng, Yue [2 ]
Han, Zitong [2 ]
Sun, Yao [2 ]
Wang, Xiaoqiu [3 ,4 ]
Zhang, Qinfang [2 ]
Zou, Zhigang [1 ]
机构
[1] Nanjing Univ, Ecomat & Renewable Energy Res Ctr ERERC, Sch Phys, Nanjing 210093, Jiangsu, Peoples R China
[2] Sch Mat Engn, Yancheng Inst Technol, Yancheng 224051, Jiangsu, Peoples R China
[3] Yancheng Inst Technol, Key Lab Adv Technol Environm Protect Jiangsu Prov, Yancheng 224051, Jiangsu, Peoples R China
[4] Jinling Inst Technol, Dept Phys, Nanjing 211169, Jiangsu, Peoples R China
基金
中国博士后科学基金; 中国国家自然科学基金;
关键词
Photocatalysis; K4Nb6O17; g-C3N4; Z-scheme; Heterojunction; GRAPHITIC CARBON NITRIDE; INTERCALATED K4NB6O17; DEGRADATION; NANOSHEETS; EFFICIENT; COMPOSITE; G-C3N4; NANOPARTICLES; CONSTRUCTION; FABRICATION;
D O I
10.1016/S1872-2067(20)63608-7
中图分类号
O69 [应用化学];
学科分类号
081704 ;
摘要
A simple calcination method was employed to prepare a Z-scheme N-doped K4Nb6O17/g-C3N4 (KCN) heterojunction photocatalyst, in which the electronic structure of K4Nb6O17 was regulated by N-doping, and g-C3N4 was formed both on the surface and within the interlayer spaces of K4Nb6O17. The KCN composite showed profoundly improved photocatalytic activity for both H-2 generation and RhB degradation compared to its counterparts. This improved performance was attributed to the synergistic effects of N-doping, which broadened its light harvesting ability, and heterojunction formation, which increased the charge separation rate. The relatively low BET specific surface area of the KCN composite had little effect on its photocatalytic activity. Based on ESR spectroscopy studies, center dot O-2-, center dot OH, and h(+) are the main active species in the photocatalytic degradation of RhB. Thus, it is reasonable to propose a Z-scheme photocatalytic mechanism over the KCN composite, which exhibits the dual advantages of efficient charge separation and high redox ability. Our work provides a simple approach for constructing large-scale Z-scheme heterojunction photocatalysts with high photocatalytic performance. (C) 2021, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
引用
收藏
页码:164 / 174
页数:11
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