Cellulose‐Supported SnW(S,O)₄ Bimetal Sulfo‐Oxide Catalysts for the Catalytic Reduction of Pollutants in the Dark

Abstract

In this paper, cellulose‐supported SnW(S,O)₄ bimetal sulfo‐oxide catalysts (labeled as SnWSO‐C or SW@C) with exceptional catalytic performance in the reduction of MB, RhB, and Cr(VI) in the presence of NaBH₄ under dark conditions were synthesized via an in‐situ hydrolysis method. The cellulose‐supported catalyst system with diverse tree species of Pinus massoniana (Pm), Populus tomentosa Carrière (Ptc), Rice hull (Rh), Phyllostachys edulis (Pe) was investigated. The 100 mL solutions of MB (20 ppm), RhB (50 ppm), and Cr(VI) (50 ppm) were completely reduced by SW@Cotton, SW@Pe, SW@Rh, SW@Ptc, and SW@Pm within 10, 7, 13, 4, and 4 min for MB; 7, 7, 8, 10, and 4 min for RhB; and 5, 8, 10, 10, and 8 min for Cr(VI), respectively. Among them, SW@Pe catalyst exhibits the highest catalytic reduction efficiency and excellent stability, maintaining a removal rate of 96% after six cycles. The superior catalytic reduction performance was attributed the unique properties of Phyllostachys edulis cellulose, characterized by low crystallinity (53.25%), minimal ash content (0.15%), and the lowest degree of polymerization (1267). These features facilitated the improved dispersion of the SnWSO bimetal sulfo‐oxide, leading to smaller crystal size, lower electrochemical impedance (2.24 Ω), and a larger electrochemically active surface area (21.86 mF/cm²). This study demonstrates the potential of cellulose‐supported bimetal sulfo‐oxide catalysts for wastewater treatment, which is significant for advancing future research on environmental pollution management using biomass‐based materials.