One-step, high-yield synthesis of g-C3N4 nanosheets for enhanced visible light photocatalytic activity

被引:40
作者
Wang, Liyan [1 ]
Hou, Yangwen [1 ]
Xiao, Shanshan [1 ]
Bi, Fei [1 ]
Zhao, Li [1 ]
Li, Yingqi [1 ]
Zhang, Xiaojia [1 ]
Gai, Guangqing [1 ]
Dong, Xiangting [2 ]
机构
[1] Jilin Jianzhu Univ, Coll Mat Sci & Engn, Key Lab Bldg Energy Saving Technol Engn, Changchun, Jilin, Peoples R China
[2] Changchun Univ Sci & Technol, Key Lab Appl Chem & Nanotechnol Univ Jilin Prov, Changchun, Jilin, Peoples R China
基金
中国国家自然科学基金;
关键词
GRAPHITIC CARBON NITRIDE; CHEMICAL EXFOLIATION; HYDROGEN-PRODUCTION; CATALYST; SEMICONDUCTOR; DEGRADATION; FABRICATION; CONVERSION; COMPOSITE; WATER;
D O I
10.1039/c9ra08922e
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
A facile template-free one-step synthesis method of ultrathin g-C3N4 nanosheets was developed through thermal polycondensation of melamine. The higher temperature, prolonged time and tightly sealed crucible reaction system contributed to the formation of ultrathin g-C3N4 nanosheets. The as-synthesized g-C3N4 nanosheets were applied to the visible light photocatalytic degradation of RhB. The photocatalytic activity was significantly enhanced with increased calcination temperature from 500 degrees C to 650 degrees C and prolonged calcination time from 4 h to 10 h. Interestingly, the obtained ultrathin g-C3N4 nanosheets simultaneously possess high yield and excellent photocatalytic activity. Moreover, g-C3N4 nanosheets can maintain photochemical stability after five consecutive runs. The remarkably enhanced photocatalytic activity can be interpreted as the synergistic effects of the enhanced crystallinity, the large surface area, the reduced layer thickness and size and the reduced number of defects. A new layer exfoliation and splitting mechanism of the formation of the ultrathin nanosheets was proposed. This work provides a new strategy to develop a facile eco-friendly template-free one-step synthesis method for potential large-scale synthesis of ultrathin nanosheets with high yield, high photocatalytic efficiency and stable activity for environmental and energetic applications.
引用
收藏
页码:39304 / 39314
页数:11
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