Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 163, Issue -, Pages 135-142Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2014.07.053
Keywords
C3N4 nanosheet; Monolayer; Mixed solvents; Tunable concentration; Photocatalytic activity
Funding
- National Natural Science Foundation of China [21303019, 21177024, 21273036]
- Natural Science Foundation of Fujian Province [2014J05016]
- Research Foundation for Middle-age and Young Teachers of Fujian Province [JA13055]
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A versatile and scalable mixed solvent strategy was developed to prepare monolayer C3N4 nanosheets with tunable concentration for the first time. This approach could also be used to prepare other 2D nanosheets from their layered materials (such as MoS2, BN, WS2 etc.). The structural features and intrinsic semiconductor properties of the as-prepared C3N4 nanosheets have been investigated in detailed. The photocatalytic activities were evaluated by photocatalytic oxidation of both benzyl alcohol and rhodamine B (RhB) under visible light irradiation. Results showed that the as-prepared monolayer C3N4 nanosheets with thickness of 0.4 nm still retained the structural features of g-C3N4 layer. The functionalities of C3N4 nanosheets well inherited from the layered parent counterpart. Furthermore, due to the exceptionally high 2D anisotropy, C3N4 nanosheets showed the distinctive physicochemical properties and unique electronic structures, such as high surface area, lower surface defects, stronger reduction ability of the photogenerated electrons, increased photoelectric response, and promoted the charge-carrier migration and separation. All of these favorable factors co-contributed to the greatly improved photocatalytic activities over C3N4 nanosheets compared with those of its bulk counterpart. (C) 2014 Elsevier B.V. All rights reserved.
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