富铁污泥基生物炭/过一硫酸盐体系去除水体中磺胺甲噁唑的性能与机理  

The performance and mechanism of iron-rich sludge-based biochar/peroxymonosulfate for sulfamethoxazole removal

作　　者：刘细祥 石欣怡 何超雅 王恒义 刘艳[1] 潘鸿辉 LIU Xixiang;SHI Xinyi;HE Chaoya;WANG Hengyi;LIU Yan;PAN Honghui(Research Center for Soil and Groundwater Environment,Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and New Technology for Carbon Neutralization,Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization,School of Materials and Environment,Guangxi Minzu University,Nanning 530006;Guangxi Research Institute of Chemical Industry Co.,Ltd.,Nanning 530001)

机构地区：[1]广西民族大学材料与环境学院,广西先进结构材料与碳中和重点实验室,广西高校环境友好材料及碳中和新技术重点实验室,土壤与地下水环境研究中心,南宁530006 [2]广西化工研究院有限公司,南宁530001

出　　处：《环境科学学报》2024年第2期104-116,共13页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金项目(No.41967030);广西科技基地和人才专项(No.桂科AD23026173);广西自然科学基金项目(No.2020GXNSFAA159170);广西民族大学相思湖青年学者创新团队项目(No.2022);广西民族大学人才启动项目(No.2018KJQD08,2022KJQD29,2022KJQD32);广西研究生教育创新计划项目(No.YCSW2023284)。

摘　　要：在工业污水处理过程中,含铁的絮凝剂和调理剂频繁使用,导致大量富铁污泥的产生,给其综合处置与利用带来了巨大挑战.本研究以富铁污泥作为原料,通过热解的方法制得富铁污泥基生物炭(FBC).将FBC进一步用于活化过一硫酸盐(PMS),以此实现水中抗生素磺胺甲噁唑(SMX)的高效降解.研究结果表明,使用0.2 g·L^(-1)的FBC900活化1.0 mmol·L^(-1)的PMS时,可在30 min内降解10 mg·L^(-1)的SMX,其活化能力仅为4.93 kJ·mol^(-1),并且在较宽的pH范围内都显示出良好的降解性能.通过自由基淬灭实验证明,FBC/PMS体系以非自由基的方式降解SMX,体系中产生的^(1)O_(2)和电子转移在SMX降解过程中起到了关键作用.此外,FBC900具有良好的磁性,使用后可利用磁力作用进行有效地分离和回收,且经过5次循环利用后,其催化活性仍维持在原有水平.The extensive application of iron salts reagents in industrial wastewater treatment results in the generation of a significant amount of iron-rich sludge,posing a challenge for its comprehensive disposal and utilisation.This study focused on converting iron-rich sludge-derived biochar(FBC)through pyrolysis for activating peroxymonosulfate(PMS)to degrade antibiotic sulfamethoxazole(SMX).The results revealed that 10 mg·L^(-1) of SMX can be completely degraded within 30 min through the activation of 1.0 mmol·L^(-1) of PMS using 0.2 g·L^(-1) of FBC900,exhibiting an exceptionally low activation energy of only 4.93 kJ·mol^(-1).Also,the system exhibited robust degradation performance across a wide pH range.Radical quenching experiments elucidated that the FBC/PMS system achieved efficient degradation of SMX through a non-radical reaction pathway,with ^(1)O_(2) generation and electron transfer playing pivotal roles in the degradation process.Additionally,FBC900 exhibited pronounced magnetic properties,facilitated its effective separation and recycling via magnetism,sustaining consistent catalytic activity even after five recycling runs.

关 键 词：富铁污泥 生物炭 过一硫酸盐 非自由基反应路径 磺胺甲噁唑 

分 类 号：X703[环境科学与工程—环境工程]