Natural bio-photosensitizers in sludge: Extracellular polymeric substances (EPS)-driven persulfate activation for sustainable antibiotic degradation

文献类型： 外文期刊

第一作者： He, Yiyang

作者： He, Yiyang;Zhang, Xinchao;Pei, Yuanyuan;Wang, Xin;Cao, Xiao;Gu, Lin;Yang, Songrui;Zhang, Hanlin;Yuan, Haiping;Xiong, Xi

作者机构：

关键词： Extracellular polymeric substances; Antibiotic; Photochemistry; Electron transfer; Molecular structure

期刊名称：JOURNAL OF CLEANER PRODUCTION （ 影响因子：10.0； 五年影响因子：10.7 ）

ISSN： 0959-6526

年卷期： 2025 年 519 卷

页码：

收录情况： SCI

摘要： In wastewater treatment plants, antibiotic accumulation in activated sludge hinders sustainable water remediation and resource recovery. To address this, we developed a sludge-derived extracellular polymeric substances (EPS)-based photosensitization strategy for peroxydisulfate (PDS) activation, leveraging EPS's inherent photochemical properties to enhance antibiotic degradation. We examined three EPS fractions (S-EPS, LB-EPS, TB-EPS) using molecular spectroscopy, electrochemical methods, and time-dependent density functional theory computations. S-EPS, rich in fulvic acid-like substances, exhibited superior PDS activation due to its elevated aromaticity, unsaturation, and lignin/CRAM content, which enhanced It-conjugation and electron transfer. Electrochemical experiments confirmed that 3EPS* activated PDS via electron transfer, with phenolic and quinone groups playing key roles. Scavenging experiments revealed the generation of & sdot;OH, SO4 & sdot;-, O2 & sdot;-, and 1O2, with 1O2 dominating tetracycline (TC) degradation. This study advances EPS-mediated photochemical processes and provides a green, sustainable pathway for transforming waste sludge into functional materials. By eliminating synthetic catalysts and harnessing solar energy, this approach aligns with cleaner production and circular bioeconomy principles, offering a scalable solution for low-carbon wastewater treatment.

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