Interfacial SnS/SnO x heterostructures on GO-PVP enable the removal of methylene blue and enhanced redox catalysis.

Here, we demonstrate the synthesis of SnS/SnO x nanoparticles (NPs) and a ternary SnS/SnO x -GO-PVP hybrid nanocomposite (NC) via a hydrothermal method for multimodal applications. SnS/SnO x -GO-PVP NC was characterized by FT-IR spectroscopy, powder XRD, SEM, XPS, BET, and TGA studies. Owing to its higher surface area, surface functionalities, and interfacial heterostructure, SnS/SnO x -GO-PVP NC exhibited superior adsorption of methylene blue (98% removal within 100 min at 4-10 ppm). Furthermore, SnS/SnO x -GO-PVP NC exhibited remarkable catalytic activities in organic redox reactions, facilitating the selective reduction of nitrobenzene and its derivatives to the corresponding azobenzenes in yields ranging from 70% to 83% and the oxidation of alcohols to the corresponding aldehydes and ketones in good to excellent yields (75-87%). The catalyst was reused for up to five cycles without any appreciable loss in catalytic activity. These results demonstrate that SnS/SnO x -GO-PVP NC is a robust, cost-effective, and multifunctional catalyst for dye remediation and redox catalysis.