Synergistic Hydrogen Peroxide-Driven Cation Valence Regulation and La/O Co-Doped SnS-Based Oxysulfide Catalyst for Efficient Catalytic Reduction of Toxic Organics and Cr(VI) Under Dark

A novel La/O co-doped SnS oxysulfide catalyst (labeled SnLaOS) with heterovalent tin states and sulfur vacancy defects is successfully synthesized for effective catalytic reduction of toxic organics heavy metal ions with NaBH 4 in the dark. La/O co-doped and hydrogen peroxide-driven SnLaOS catalyst with suitable heterovalent Sn 2+ /Sn 4+ states and sulfur vacancy defects exhibited excellent catalytic reduction capability. The 100 mL 20 ppm of 4-nitrophenol (4-NP) and 50 ppm of rhodamine-B (RhB), methylene blue (MB), methyl orange (MO), and Cr(VI) solution are entirely reduced by 5 mg SnLaOS-3 within 10, 12, 12, 16, and 14 min, respectively, with durable stability. Synergistic transition metal La 3+ -cation and O 2− -anion co-doped SnS adjusted the energy bandgap and introduced sulfur vacancy defects, and the hydrogen peroxide-driven regulated the SnLaOS with suitable Sn 4+ /Sn 2+ states ratio. The sulfur vacancies in SnLaOS provide active sites for adsorbed proton for pollutants reduction, and heterovalent Sn 2+ /Sn 4+ states in SnLaOS facilitates electrons efficient transfer through electron hopping between Sn 2+ and Sn 4+ for pollutants reduction. This study provides a novel efficient catalyst for the water pollutants treatment.