Imaging Science and Photochemistry ›› 2015, Vol. 33 ›› Issue (5): 434-440.DOI: 10.7517/j.issn.1674-0475.2015.05.434

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Increasing Photocatalytic Activity of Graphitic Carbon Nitride by Carbon Doping through in situ Polycondensation

HONG Xingxing, KANG Xiangdong, LIU Gang, CHENG Huiming   

  1. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, Liaoning, P. R. China
  • Received:2015-07-22 Revised:2015-07-26 Online:2015-09-16 Published:2015-09-16


In this paper, g-C3N4 with nitrogen vacancy was obtained by carbon doping during in situ polycondensation process from the mixture of dicyandiamide precursor and polyethylene glycol additive. XRD, FTIR, XPS, UV-Vis and FL spectroscopies were employed to investigate the influence of the nitrogen vacancy on the phase structure, composition and chemical states, the light absorption and photocatalytic activity of the as-prepared g-C3N4. The results show that in situ carbon doping in the framework of g-C3N4 can effectively extend its visible light absorption range to 850 nm. As a consequence, the nitrogen-deficient g-C3N4shows much superior photocatalytic activities compared to the pristine g-C3N4 in degrading the organic pollutant Rhodamine B and generating hydrogen from aqueous solution containing triethanolamine scavenger under both UV-visible light and visible light irradiation, especially more prominent under visible light irradiation.

Key words: photocatalysis, g-C3N4, doping, vacancy, polyethylene glycol