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Citation: Bo Yuan, Jiangxia Wei, Tianjiao Hu, Haibo Yao, Zhenhua Jiang, Zhiwei Fang, Zengyong Chu. Simple synthesis of g-C3N4/rGO hybrid catalyst for the photocatalytic degradation of rhodamine B[J]. Chinese Journal of Catalysis, ;2015, 36(7): 1009-1016. doi: 10.1016/S1872-2067(15)60844-0 shu

Simple synthesis of g-C3N4/rGO hybrid catalyst for the photocatalytic degradation of rhodamine B

  • 1.

    a College of Science, National University of Defense Technology, Changsha 410073, Hunan, China;

  • Corresponding author: Zengyong Chu, 
  • Received Date: 25 January 2015
    Available Online: 20 March 2015

    Fund Project: 国家自然科学基金(51073172) (51073172) 湖南省自然科学杰出青年基金(14JJ1001). (14JJ1001)

  • A hybrid catalyst of g-C3N4 (graphitic carbon nitride)/rGO (reduced graphene oxide) was prepared by directly heating a mixture of melamine and GO in air. g-C3N4 in the hybrid retained the structure of pristine g-C3N4, and the heterojunction between g-C3N4 and rGO was formed by π-π interaction. The highest photocatalytic efficiency for the degradation of rhodamine B (RhB) was with the melamine/GO mass ratio of 800/1, with a first order rate constant 2.6 times that of pristine g-C3N4. The enhanced photocatalytic activity was assigned to the rGO-promoted separation of photo-generated electron (e-)-hole (h+) pairs. In addition, the photocatalytic activity of g-C3N4/rGO was pH sensitive with a much increased photodegrading rate at low pH values. The first order rate constant was 8.6 times that of pristine g-C3N4 at pH = 1.98. The pH sensitive behavior resulted from the promoted oxidation of h+ with RhB by the consumption of e- with the reaction of proton (H+) in which rGO acted as a good platform for transferring e- through its atomic sheets.
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