期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 180, 期 -, 页码 656-662出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2015.06.056
关键词
Carbon dot; Graphitic carbon nitride; Metal-free photocatalyst; Phenol
资金
- National Basic Research Program of China [2011CB936001]
- National Natural Science Foundation of China [21321004, 21207146, 21177138, 21477146, 21377142]
Environment-friendly metal-free photocatalysts represent a promising alternative to conventional metal-based semiconductors. In this report, a carbon dots (CDs) decorated graphitic carbon nitride (g-C3N4) photocatalyst was synthesized via a facile impregnation-thermal method. Under visible light irradiation, a very low CDs content of 0.5 web in the g-C3N4/CDs composite resulted in a 3.7 times faster reaction rate for phenol photodegradation than pristine g-C3N4. Spectroscopic and photoelectrochemical characterizations revealed that impregnation of CDs into g-C3N4 not only enhanced the production of photogenerated electron-hole pairs by extending the visible light absorption region due to the upconverted photoluminescence character of CDs, but also facilitated electron-hole separation by band alignment in the g-C3N4/CDs junction, thus yielded more holes, O-center dot(2)- and (OH)-O-center dot radicals to promote phenol degradation. These results highlight the potential application of sustainable metal-free photocatalysts in water purification. (C) 2015 Elsevier B.V. All rights reserved.
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