Stratified EPS from sewage sludge as a multifunctional modulator for FeCN photocatalyst: Interfacial engineering and enhanced norfloxacin degradation

文献类型： 外文期刊

第一作者： Cao, Xiao

作者： Cao, Xiao;Zhang, Xinchao;He, Yiyang;Xu, Suyun;Gu, Lin;Zhang, Hanlin;Yuan, Haiping

作者机构：

关键词： Photocatalysis; Antibiotic degradation; Extracellular polymeric substances (EPS); FeCN@SEPS; Norfloxacin

期刊名称：SEPARATION AND PURIFICATION TECHNOLOGY （ 影响因子：9.0； 五年影响因子：8.5 ）

ISSN： 1383-5866

年卷期： 2025 年 376 卷

页码：

收录情况： SCI

摘要： Recent progress in antibiotics degradation has spurred the development of eco-friendly visible light catalysts, with Fe/g-C3N4 (FeCN) emerging as a prominent candidate. However, antibiotics and extracellular polymeric substances (EPS) secreted from sewage sludge represent a critical challenge, as they often co-occur in receiving waters. Inspired by the significant role of photosensitized organics in ligand to metal charge transfer (LMCT) in the photolysis of iron-organics complexes, we explored a novel EPS-wrapped FeCN photocatalyst, which were composited via in-situ bio-nano interfacial interactions. By stratifying EPS into three distinct fractions (soluble, loosely-bound, and tightly-bound), we investigated their differential effects on the physicochemical properties of FeCN hybrids. Through experimental and computational analyses, we demonstrated that EPS-Fe coordination engineering not only enhanced carrier separation across the visible spectrum but also promoted efficient Fe(II)/ Fe(III) electron cycling. FeCN@SEPS hybrids achieved superior (92.7 %) degradation of norfloxacin (NOR) within 120 min under visible light, due to its higher proportion of aromatic compounds. Mechanistic studies combining EPR, DFT, and LC-MS identified superoxide radicals and electron transfer as the primary degradation pathways, and the degradation routes of NOR were systematically mapped. By repurposing sludge EPS as an electron shuttle rather than inhibitors, this study pioneers a sludge-to-catalyst strategy for amplifying antibiotic removal through organic-inorganic synergy, offering a sustainable blueprint for wastewater remediation.

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