Investigation for the effects of ball milling process on the physical characteristics, the behaviors of carriers and the photocatalytic activity of sulfur doped g-C3N4

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The ball milling process was adopted to improve the photocatalytic activity of g-C3N4. Sulfur doped g-C3N4, which shows better photoconversion efficiency than pristine g-C3N4, was used as starting material for the modification. The photocatalyst was prepared by calcinating thiourea and the replacement of sulfur with nitrogen was observed. An enhanced dispersion property and enlarged surface area, which can be ascribed to the reduced particle size, were observed after the modification. Furthermore, a reduced recombination rate was measured as a result of the eliminating the amino spices on the surface. The sample modified by for 48 h showed an excellent hydrogen production rate under visible light irradiation with the photocatalytic hydrogen production activity 5.3 times higher than that of the unmodified sample. The prolonged lifetime of the carriers was also identified and the improvement of the photocatalytic activity can be attributed to the synergic effect of the reduced particle size and decreased surface defect concentration. (C) 2016 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Issue Date
2017-02
Language
English
Article Type
Article
Keywords

GRAPHITIC CARBON NITRIDE; VISIBLE-LIGHT; HYDROGEN EVOLUTION; NANOSHEETS; SEMICONDUCTOR; PERFORMANCE; PHOTODEGRADATION; GENERATION; PYROLYSIS; MELAMINE

Citation

INTERNATIONAL JOURNAL OF HYDROGEN ENERGY, v.42, no.8, pp.5485 - 5495

ISSN
0360-3199
DOI
10.1016/j.ijhydene.2016.08.0/7
URI
http://hdl.handle.net/10203/225121
Appears in Collection
CBE-Journal Papers(저널논문)
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