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  • Title: Novel mesoporous graphitic carbon nitride modified PbBiO2Br porous microspheres with enhanced photocatalytic performance.
    Author: Wang B, Di J, Liu G, Yin S, Xia J, Zhang Q, Li H.
    Journal: J Colloid Interface Sci; 2017 Dec 01; 507():310-322. PubMed ID: 28803026.
    Abstract:
    Sustainable mesoporous graphitic carbon nitride (mpg-C3N4) modified PbBiO2Br porous microsphere (mpg-C3N4/PbBiO2Br) had been successfully synthesized via solvothermal process. Multiple techniques were applied to explore the structure, morphology, optical and electronic properties of the as-prepared photocatalysts. It could be found that the mpg-C3N4 was uniformly distributed on the surface of the PbBiO2Br porous microsphere. Compared with the pure PbBiO2Br, the mpg-C3N4/PbBiO2Br exhibited superior photocatalytic activity for the degradation of organic pollutants under visible light irradiation. When the mass fraction of mpg-C3N4 was 3%, the mpg-C3N4/PbBiO2Br composite materials exhibited the highest photocatalytic performance. The results indicated that the introduction of mpg-C3N4 could effectively enhance the electron mobility to promote the catalytic activity. The enhanced photocatalytic activity of the mpg-C3N4/PbBiO2Br materials can be attributed to the stronger optical trapping capability and the more effective separation efficiency of photogenerated electron-hole pairs. During the process of photocatalysis, the main active species of the photocatalysts were determined to be the and hole under visible light irradiation. Based on the relative band positions of mpg-C3N4 and PbBiO2Br, a possible photocatalytic mechanism of mpg-C3N4/PbBiO2Br composite catalyst was proposed.
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