Hubei Key Laboratory of Mineral Resources Processing and Environment, School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan, 430070, China.
Key Laboratory of Material Chemistry for Energy Conversion and Storage, Ministry of Education, Hubei Key Laboratory of Material Chemistry and Service Failure, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology, Wuhan, 430074, PR China.
J Environ Manage. 2023 Dec 1;347:119119. doi: 10.1016/j.jenvman.2023.119119. Epub 2023 Oct 5.
Advanced oxidation processes (AOPs) based on peracetic acid (PAA) has been extensively concerned for the degradation of organic pollutants. In this study, metallic iron-modified sludge biochar (Fe-SBC) was employed to activate PAA for the removal of sulfamethoxazole (SMX). The characterization results indicated that FeO and FeO were successfully loaded on the surface of the sludge biochar (SBC). Fe-SBC/PAA system achieved 92% SMX removal after 30 min. The pseudo-first-order kinetic reaction constant of the Fe-SBC/PAA system was 7.34 × 10 min, which was 2.4 times higher than the SBC/PAA system. The degradation of SMX was enhanced with increasing the Fe-SBC dosage and PAA concentration. Apart from Cl, NO and SO had a negligible influence on the degradation of SMX. Quenching experiments and electron paramagnetic resonance (EPR) techniques identified the existence of reactive species, of which CHC(O)OO•, O, and O were dominant reactive species in Fe-SBC/PAA system. The effect of different water matrices on the removal of SMX was investigated. The removal of SMX in tap water and lake water were 79% and 69%, respectively. Four possible pathways for the decay of SMX were presented according to the identification of oxidation products. In addition, following the ecological structure-activity relationship model (ECOSAR) procedure and the germination experiments with lettuce seeds to predict the toxicity of the intermediates. The acute and chronic ecotoxicity of SMX solution was dramatically diminished by processing with Fe-SBC/PAA system. In general, this study offered a prospective strategy for the degradation of organic pollutants.
基于过氧乙酸（PAA）的高级氧化工艺（AOPs）已广泛应用于有机污染物的降解。本研究采用载铁污泥生物炭（Fe-SBC）活化 PAA 去除磺胺甲恶唑（SMX）。表征结果表明，FeO 和 FeO 成功负载在污泥生物炭（SBC）表面。Fe-SBC/PAA 体系在 30 min 内实现了 92%的 SMX 去除。Fe-SBC/PAA 体系的拟一级动力学反应常数为 7.34×10-2 min-1，是 SBC/PAA 体系的 2.4 倍。随着 Fe-SBC 用量和 PAA 浓度的增加，SMX 的降解得到增强。除 Cl 外，NO 和 SO 对 SMX 的降解影响可以忽略不计。猝灭实验和电子顺磁共振（EPR）技术证实了活性物质的存在，其中 CHC(O)OO•、O 和 O 是 Fe-SBC/PAA 体系中的主要活性物质。考察了不同水基质对 SMX 去除的影响。自来水中 SMX 的去除率为 79%，湖水为 69%。根据氧化产物的鉴定，提出了 SMX 衰减的 4 条可能途径。此外，根据生态结构-活性关系模型（ECOSAR）程序和生菜种子发芽实验预测中间产物的毒性。Fe-SBC/PAA 体系处理后，SMX 溶液的急性和慢性生态毒性显著降低。总的来说，本研究为有机污染物的降解提供了一种有前景的策略。
