Chemical Journal of Chinese Universities ›› 2020, Vol. 41 ›› Issue (1): 132-139.doi: 10.7503/cjcu20190463

• Physical Chemistry • Previous Articles     Next Articles

Effect of Oxygen on Photocatalytic Nitrogen Fixation Performance of N Vacancy-embedded Graphitic Carbon Nitride

ZHAO Yanfeng,SUN Xiaolong,HU Shaozheng(),WANG Hui,WANG Fei,LI Ping   

  1. College of Chemistry, Chemical Engineering and Environmental Engineering,Liaoning Shihua University, Fushun 113001, China
  • Received:2019-08-23 Online:2019-11-21 Published:2019-11-21
  • Contact: Shaozheng HU E-mail:hushaozhenglnpu@163.com
  • Supported by:
    ? Supported by the National Natural Science Foundation of China No(41571464);the Project of Education Department of Liaoning Province, China No(L2017LQN011)

Abstract:

N vacancy and oxygen co-doped g-C3N4 with outstanding N2 photofixation ability was synthesized by dielectric barrier discharge plasma treatment. XRD, UV-Vis, N2 adsorption, SEM, XPS, PL and TPD were used to characterize the as-prepared catalysts. The result shows that plasma treatment does not change the morphology of as-prepared catalyst but introduce nitrogen vacancies and oxygen into g-C3N4 lattice simultaneously. The as-prepared co-doped g-C3N4 displays the ammonium ion production rate as high as 5.9 mg·L -1·h -1· g cat - 1 , which is 2.2 and 20 times that of individual N vacancy-doped g-C3N4 and neat g-C3N4, as well as good catalytic stability. Experimental and density functional theory(DFT) calculation results indicate that, compared with individual N vacancies doping, the introduction of oxygen can promote the activation ability of N vacancies to N2 molecule, leading to the promoted N2 photofixation performance.

Key words: Graphitic carbon nitride, Nitrogen photofixation, Co-doping, Photocatalysis, Plasma treatment

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