Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 563, Issue -, Pages 263-270Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2018.12.020
Keywords
Graphite carbon nitride; Tellurium doping; Visible-light photocatalysis; Nitrogen photofixation
Categories
Funding
- National Natural Science Foundation of China [51778295, 51678306, 51478223]
- China Postdoctoral Science Foundation [2017T100372, 2016M590458, 2013M541677]
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Tellurium doped graphitic carbon nitride (TeCN) photocatalyst was synthesized by the combination of hydrothermal treatment and copolymerization of melamine and tellurium powder. With Te doping, 1% TeCN exhibits a high nitrogen fixation rate under visible light irradiation, which is 7.2 times compared to that of graphitic carbon nitride (CN). The markedly higher activity of 1% TeCN is attributed to the better chemical adsorption of N-2, enhanced separation efficiency of charge carriers and higher CB potential. Notably, a new midgap states induced by Te doping also contributes to the improved activity of nitrogen fixation. Besides, valence state changes between Te6+, Te4+ and Te degrees in 1% TeCN further promoted the nitrogen fixation activity. This study demonstrates that the modification of g-C3N4 by Te is an effective way to improve the photocatalytic nitrogen fixation effect of the photocatalyst.
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