Persulfate activation by magnetic SnS2-Fe3O4/rGO nanocomposite under visible light for detoxification of organophosphorus pesticide

In this study, a novel SnS2-Fe3O4/rGO catalyst was applied to activate persulfate (PS) in the removal of diazinon under visible-light irradiation. Characteristics of the SnS2-Fe3O4/rGO nanocomposite were ana-lyzed via different techniques. The results indicate that 5 mg L-1 diazinon solution could be almost com-pletely degraded in 40 min with 0.5 g L-1 catalyst and 1 mM L-1 PS, and TOC can be reduced 78%. Based on the scavenging experiments a possible reaction mechanism was proposed. The results revealed that the removal of diazinon followed pseudo-first-order kinetics. Then, the intermediates produced in the system were determined using LC-MS/MS. The toxicity test indicated that the SnS2-Fe3O4/rGO-PS system was effective at decreasing the toxicity of diazinon. It was found that the SnS2-Fe3O4/rGO-PS system had good catalytic performance and reusability. The results of this study provided beneficial information for the application of the SnS2-Fe3O4/rGO-PS system in organic contaminants degradation.CO 2022 Elsevier B.V. All rights reserved.