Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 42, Issue 1, Pages 143-151Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2016.11.040
Keywords
g-C3N4; Hydrogen; Visible light; Photocatalysts
Categories
Funding
- National Natural Science Foundation of China [21273157]
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In this study, the g-C3N4 was prepared by recrystallization and calcining the mixture of urea and thiourea. The obtained samples show high photocatalytic performance for H-2 evolution under visible light (lambda > 420 nm) irradiation in the presence of triethanolamine as sacrificial reagent. The g-C3N4 was characterized by X-ray diffraction (XRD), nitrogen physisorption, XPS, UV-visible spectroscopy, element analysis (EA), Fourier transform infrared (FT-IR) spectroscopy, scanning electron microscopic (SEM) and photoluminescence (FL) spectroscopy analysis. The experimental results indicated that the samples derived from the mixture of urea and thiourea contributed to enlarge the specific surface area of g-C3N4 and decrease the recombination of photo-induced electron-hole pairs, consequently enhancing photocatalytic activity. The influence of different mass fraction of thiourea on the H-2 evolution rate was explored in the presence of triethanolamine as sacrificial reagent under visible light (A > 420 nm) irradiation. The photocatalytic results indicated that the sample with optimal photocatalytic activity is derived from the mixture with a thiourea's mass fraction of 2.44%. The optimal H-2 evolution rate is 2.60 times and 6.17 times higher than that over g-C3N4 from urea and g-C3N4 from thiourea, respectively. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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