Synthesis, Characterization of S-Scheme Heterojunction (rGO/Fe3O4/Bi2S3/MgZnO) for Enhance Photocatalytic Degradation of Sulfonylurea Herbicides Under Visible Light

Abstract

The S-scheme heterojunction (rGo/Fe₃O₄/Bi₂S₃/MgZnO) with strong superparamagnetic characteristics was built in the current work. Several characterization techniques (XRD, FTIR, BET, VSM, TEM, SEM, PL, DRS, EDS, and elemental mapping) were used to describe the states of elements, chemical composition, optical characteristics, and nanostructure morphology. Using visible light irradiation (100 W, LED), the photodegradation performance of the rGO/Fe₃O₄/Bi₂S₃/MgZnO heterojunction was examined in relation to sulfosulfuron herbicides. The heterojunction of rGo/Fe₃O₄/Bi₂S₃/MgZnO demonstrated total degradation of sulfosulfuron. In the rGo/Fe3O4/Bi2S3/MgZnO heterojunction, the three efficient photocatalysts work in concert to effectively suppress the rate of recombination and offer an excellent route for electron and hole migration. According to the kinetic exams, rGO/Fe₃O₄/Bi₂S₃/MgZnO had a higher degradation constant. The primary reactive species is •O²⁻, as demonstrated by the radical tests. In five degradation cycles, the rGO/Fe₃O₄/Bi₂S₃/MgZnO showed effective stability and straightforward marantic separation. Based on the photoelectrochemical measurements and trapping tests, the S-scheme mechanism was clearly explained. This work offers an effortless way to create photocatalysts in heterojunction. There may be several uses for this work in the treatment of wastewater and the reduction of environmental contamination.