Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (9): 2896.doi: 10.7503/cjcu20210255

• Physical Chemistry • Previous Articles     Next Articles

g-C3N4/CdS/Ni Composite as a Bifunctional Photocatalyst for H2 Generation and 5-Hydroxymethylfurfural Oxidation

LI Chenchen, NA Yong()   

  1. School of Chemistry and Chemical Engineering,Harbin Institute of Technology,Harbin 150001,China
  • Received:2021-04-16 Online:2021-09-10 Published:2021-09-08
  • Contact: NA Yong E-mail:yongna@hit.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21603046);the Nature Science Foundation of Heilongjiang Province, China(YQ2019B003)

Abstract:

The bifunctional photocatalyst g-C3N4/CdS/Ni was synthesized by high temperature calcination, in situ growth method and photoreduction method in three steps. The introduction of CdS in this composite can enhance the separation rate of photogenerated holes and electrons. And the loading of Ni can further improve the photoinduced hydrogen production rate. In addition, the photocatalytic hydrogen evolution reaction was carried out in triethanolamine(TEOA, hole sacrificial agent) aqueous solution and the optimal CdS content of the composite was determined. Experiments showed that the composite with 25%(mass fraction) CdS exhibited the best photocatalytic activity and the Ni was a good cocatalyst for hydrogen production. The highest H2 gene- ration rate catalyzed by g-C3N4/25CdS/Ni composite was 4134.5 μmol·g-1·h-1, which was 115 times higher than that of g-C3N4/Ni composite. Subsequently, the TEOA in this system was replaced by 5-hydroxymethylfurfural(HMF). HMF can be selectively oxidized to the value-added chemical 2,5-diformylfuran(DFF). When the conversion of HMF was 82.3% and the selectivity of DFF was 69.4%, the yield of DFF was up to the highest(57.2%). At the same time, the yield of H2 in this system was 51.8 μmol/g. In summary, g-C3N4/CdS/Ni composite can catalyze photoinduced H2 evolution and HMF selective oxidation in the same system.

Key words: Photocatalysis, Selective oxidation, 5-Hydroxymethylfurfural, 2, 5-Diformylfuran, Hydrogen

CLC Number: 

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