Magnetic Recyclable Double-Heterojunction SrFe12O19/SnS2/MoS2 Nanophotocatalyst: Synthesis and Visible-Light Catalytic Degradation Performance Study

Abstract

The development of efficient, recyclable, broad-spectrum photocatalysts was the primary objective in the field of photocatalytic wastewater degradation. Herein, a novel highly efficient ternary magnetic semiconductor composite was synthesized by integrating SrFe₁₂O₁₉, MoS₂ nanoflower clusters, and SnS₂ nanoflowers using high-temperature calcination and a one-step solvothermal method. The synthesized heterojunction nanocomposite was characterized using numerous analytical techniques, and its photocatalytic activity was evaluated under half sunlight intensity irradiation. The integration of SnS₂ with SrFe₁₂O₁₉ and MoS₂ effectively modified the crystal structure and morphology of SnS₂ nanoflowers, leading to an increase in active sites while overcoming the significant electron–hole recombination rates of the individual components. The SrFe₁₂O₁₉/SnS₂/MoS₂ composite achieved 98.69% degradation of MB dye at a suitable pH of 6 and a period of 120 min of irradiation. Additionally, it maintained an excellent magnetic phenomena which contributed to it effortless to collect and reclaim from the residual mixture. After three cycles, the MB dye degradation remained at 84.07%, demonstrating its endurance and resilience. The scavenger test identified the superoxide radical as the primary agent responsible for dye destruction. This work provides study presents a synthesis method for highly efficient photocatalysts using in natural visible-light that can be recovered by simply applying an external magnetic field.