Simplistic preparation of Sn-doped MgIn2S4 for photocatalytic organic dye degradation under visible light irradiation

The increasing amount of dye wastewater presented significant environmental and public health concerns, underscoring the urgent need to develop an eco-friendly, cost-effective, and sustainable approach to wastewater treatment. Photocatalytic technology is an ideal candidate for wastewater treatment due to its low pollution, high efficiency, and easy operation. In this work, a series of Sn-doped MgIn 2 S 4 photocatalysts were successfully prepared via the hydrothermal method. The 60%Sn–MgIn 2 S 4 showed the best photocatalytic activity, with a degradation rate of 62.5% for methyl orange (MO) over a 60-min driven by visible light. 60%Sn–MgIn 2 S 4 exhibited ideal stability, retaining 85% of its original degradation rate after four cycles of testing. Electrochemical impedance spectroscopy suggested that the 60%Sn–MgIn 2 S 4 possessed the ideal photogenerated charge migration rates. In addition, the photocatalytic active species-capture experiments showed that · O 2 – and · OH were the main active species for the photocatalytic degradation of MO over 60%Sn–MgIn 2 S 4 . This research provided a significant foundation for the development of MgIn 2 S 4 -based photocatalytic materials.