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

Abstract 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 NaBH₄ in the dark. La/O co‐doped and hydrogen peroxide‐driven SnLaOS catalyst with suitable heterovalent Sn²⁺/Sn⁴⁺ 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 La³⁺‐cation and O²⁻‐anion co‐doped SnS adjusted the energy bandgap and introduced sulfur vacancy defects, and the hydrogen peroxide‐driven regulated the SnLaOS with suitable Sn⁴⁺/Sn²⁺ states ratio. The sulfur vacancies in SnLaOS provide active sites for adsorbed proton for pollutants reduction, and heterovalent Sn²⁺/Sn⁴⁺ states in SnLaOS facilitates electrons efficient transfer through electron hopping between Sn²⁺ and Sn⁴⁺ for pollutants reduction. This study provides a novel efficient catalyst for the water pollutants treatment.