Visible Light-Based Ag 3 PO 4 /g-C 3 N 4 @MoS 2 for Highly Efficient Degradation of 2-Amino-4-acetylaminoanisole (AMA) from Printing and Dyeing Wastewater

In this research, the preparation of a Ag 3 PO 4 /g-C 3 N 4 @MoS 2 photocatalyst and the performance and mechanism of degradation of 2-amino-4-acetaminoanisole (AMA) were studied. The phase composition and morphology of the synthesized samples were comprehensively characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), ultraviolet–visible diffuse reflectance (UV–Vis), and photoelectron spectroscopy (XPS). The catalytic performance of the photocatalyst was evaluated by the visible-light catalytic degradation of the AMA. The experimental results show that the Ag 3 PO 4 /g-C 3 N 4 @MoS 2 composite photocatalyst has stronger photocatalytic oxidation and reduction capabilities than Ag 3 PO 4 and Ag 3 PO 4 /g-C 3 N 4 . The material only decreases by 31.3% after five cycles of use, indicating that the material has good light stability. Free radical capture experiments prove that photo-generated holes (h + ) and superoxide radicals (·O 2 − ) are the main active substances in the photocatalytic process. The fundamental studies in the present research provide a new perspective for constructing an innovative type of visible-light photocatalyst and a new way to promote the photocatalytic degradation of organic pollutants.