Preparation and photocatalytic property of Bi2S3/g-C3N4 heterojunction composite catalyst
As one kind of typical polymer semiconductor,g-C3N4 is a promising photocatalyst material with excellent thermal and chemical stability.In this paper,Bi2S3/g-C3N4 composite catalysts were prepared by hydrothermal method.The composition,morphology,structure and properties of the sample were characterized by XRD,SEM,TEM,UV-Vis and FS,respectively.The catalytic properties of Bi2S3/g-C3N4 composites were evaluated through degradation of methyl orange(MO)under the condition of simulating solar light.The results showed that the heterojunction structure of the composite catalyst significantly enhanced the photocatalytic performance of g-C3N4.The decomposition rate of MO by Bi2S3/g-C3N4 composite photocatalyst for 3 h was far higher than that of pure Bi2S3 and g-C3N4,which was 8.9％and 38.6％,respectively,with the highest value of 97.4％when the mass fraction of Bi2S3 reached 50％.The mechanism of Bi2S3/g-C3N4 composites with enhanced photocatalytic activity was studied.The addition of Bi2S3 significantly expanded the light absorption range of g-C3N4 and the construction of heterojunction with g-C3N4,which could promote the effective separation of photogenerated carriers and extend the carrier life,thus improving the photocatalytic performance of Bi2S3/g-C3N4 composite catalysts.
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