Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 44, Issue 2, Pages 748-756Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2018.11.025
Keywords
g-C3N4; Mesoporous nanosheet; Sodium doping; Photocatalytic hydrogen evolution; Sodium chloride
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Funding
- National Natural Science Foundation of China [41502030]
- Zhejiang Provincial Natural Science Foundation of China [LQY18D020001]
- Fundamental Research Funds for the Central Universities, China University of Geosciences (Wuhan) [CUGL180405]
- Science and Technology Department of Hubei Province of China [2017ACA091]
- Open Foundation of Engineering Research Center of Nano-Geomaterials of Ministry of Education [NGM2017KF008]
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Synchronous nano-structuring and element-doping of g-C3N4 were realized via a green one-pot approach to improve its photocatalytic activity. Na-doped mesoporous g-C3N4 nanosheets of similar to 5 nm in thickness were facilely synthesized by calcining a mixture of dicyandiamide and sodium chloride. NaCl not only serves as a confining-reactor to confine the growth of g-C3N4 into mesoporous nanosheets, but also acts as a sodium source for Na-doping. The nanosheets own greater specific surface area, stronger optical absorption and lower recombination of photo-induced electron-hole pairs than bulk g-C3N4, and exhibit an excellent visible-light photocatalytic hydrogen evolution efficiency which is about 13 times that of bulk g-C3N4. Moreover, the thermostable and hydrosoluble NaCl is simply removed and recycled by water and then directly reused in a new synthesis, making the process to be environmental-friendly and sustainable. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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