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Article Abstract
Rhodamine B (RhB), a persistent carcinogenic dye, poses critical challenges for environmental remediation. Herein, we report a sulfur-doped single-atom nanozyme (FeNC-SO SAzyme) with boosted peroxidase-mimetic activity for rapid RhB degradation. FeNC-SO, synthesized pyrolysis and sulfur modification, features a sulfur-doped carbon network with atomically dispersed Fe-N-C-S active sites. Compared to undoped FeNC, sulfur doping significantly boosted peroxidase-like activity (20.83 U mg, 12.39-fold enhancement) by tailoring Fe 3d-orbital electron density and lowered the Michaelis-Menten constants for HO (31.6 mM) and TMB (0.047 mM), indicating superior substrate affinity. Leveraging its Fenton-like catalytic capability, FeNC-SO activated HO to generate hydroxyl radicals (˙OH) under near-neutral conditions (pH 6.5), achieving over 96% RhB degradation within 15 min. The system demonstrated robust performance in real water samples (tap water: 84.57% degradation efficiency; Lijiang River water: 71.37% degradation efficiency) and maintained stability across a broad pH range (5.0-7.0). This sulfur doping approach provides an effective strategy to engineer SAzymes for neutral pH wastewater treatment and is particularly suitable for textile industries generating alkaline dye effluents (pH 6-8).
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