Preparation and Properties of CdS/Spherical g-C₃N₄ n-n Heterojunction as a Visible-Light-Driven Photocatalyst for Tetracycline Degradation

Abstract

The CdS/ spherical g-C₃N₄ n-n heterojunction photocatalyst was fabricated via a solvothermal method. The tetracycline was used to characterize the photocatalytic properties of the as-developed hybrids. The photocatalytic degradation mechanism of the as-developed heterojunction photocatalyst was also analyzed. Research results show that CdS nanoparticles are well dispersed in the surface layer of spherical g-C₃N₄. Moreover, the mass ratio of CdS to spherical g-C₃N₄ will influence the photocatalytic activity of the asdeveloped composites, which shows the trend of first increasing and then decreasing as it increased. When the mass ratio is 7:1, in 25 min, the as-developed heterojunction shows 93.2 % of the maximum photocatalytic efficiency and still exhibits 83.6 % after 5 times cycle testing. Moreover, the as-developed hybrids can accelerate the electron transport and improve the separation efficiency of photo-generated carriers compared with pure samples. In addition, the holes and superoxide radicals are dominating active species during the photocatalytic degradation process.

Keywords

spherical g-C₃N₄ / photocatalysis / heterojunction / tetracycline

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