Fabrication of 2D g-C3N4/CdS core–shell heterojunction with effective photocatalytic activity for dye degradation and reduction of Cr(VI) under visible light

Through a typical hydrothermal reaction, the g-C3N4/CdS core–shell nanocomposite was obtained. The prepared heterojunction was characterized by TEM, XRD, FT-IR, UV–Vis, XPS, and other analytical methods. The photocatalytic activity of g-C3N4/CdS for degradation is obviously excellent. After repeat the photocatalysis experiment five times, the photocatalytic efficiency did not decrease significantly, which is very meaningful for the application of pollutants in water. Through a series of mechanism verification experiments, a reasonable mechanism of catalyst degradation of dyes and heavy metal pollutants has been elucidated.