纳米Fe<sub>3</sub>O<sub>4</sub>/生物炭活化过硫酸盐降解盐酸四环素

刘翠英; 郑今今; 宋丽莹; 曾涛; 樊建凌

文章摘要

刘翠英,郑今今,宋丽莹,曾涛,樊建凌.纳米Fe₃O₄/生物炭活化过硫酸盐降解盐酸四环素[J].农业环境科学学报,2022,41(5):1058-1066.

纳米Fe₃O₄/生物炭活化过硫酸盐降解盐酸四环素

Degradation of tetracycline hydrochloride using persulfate activated by nano-Fe₃O₄/biochar composites

投稿时间：2021-09-22

DOI：10.11654/jaes.2021-1086

中文关键词: 生物炭铁过硫酸盐盐酸四环素氧化降解自由基

英文关键词: biochar iron persulfate tetracycline hydrochloride oxidative degradation free radicals

基金项目:江苏省“六大人才高峰”项目（JNHB-061）；南京市留学人员科技创新项目（R2019LZ09）

作者	单位
刘翠英	南京信息工程大学应用气象学院农业资源与环境系, 南京 210044
郑今今	南京信息工程大学长望学院, 南京 210044
宋丽莹	南京信息工程大学应用气象学院农业资源与环境系, 南京 210044
曾涛	南京信息工程大学应用气象学院农业资源与环境系, 南京 210044
樊建凌	南京信息工程大学环境科学与工程学院, 南京 210044

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中文摘要:

为找到经济有效且环保的自由基激发剂，以激发过硫酸盐（PS）氧化降解有机污染物，本研究制备了纳米Fe₃O₄/生物炭（BC）复合材料，并对其进行表征，检验其激发PS氧化降解水中盐酸四环素（TCH）的效果。结果发现，质量比为1∶4、1∶2和1∶1的纳米Fe₃O₄/BC复合材料均能有效激发PS氧化降解TCH，降解4 h后，TCH浓度分别减少了80.1%、82.5%和86.5%，而单一纳米Fe₃O₄和单一BC处理的TCH浓度仅减少了67.7%和61.8%。阴离子HCO₃^-和H₂PO₄^-显著抑制TCH降解，且HCO₃^-比H₂PO₄^-的抑制作用更强，而Cl^-和NO₃^-促进TCH降解。淬灭试验及电子自旋顺磁共振（EPR）检测表明，该降解过程中单线态氧（¹O₂）是主要活性物质，其次是羟基自由基（·OH）。当重复使用第3次时，质量比为1∶4、1∶2和1∶1的纳米Fe₃O₄/BC复合材料对TCH的去除率仍达70%以上。因此，纳米Fe₃O₄/BC复合材料是一种很有应用潜力的PS激发剂，可实现TCH的快速氧化降解。

英文摘要:

To identify an economical, effective, and environmentally friendly free radical activator that can stimulate the oxidative degradation of organic pollutants with persulfate（PS）, nano-Fe₃O₄/biochar（BC）composites were prepared, characterized, and tested for their ability to stimulate PS to oxidize tetracycline hydrochloride（TCH）in water. The results showed that the three mass ratios（1∶4, 1∶2 and 1∶1）of the nano-Fe₃O₄/BC composites could all stimulate PS to oxidize TCH effectively. After 4 h of degradation, the concentrations of TCH were reduced by 80.1%, 82.5%, and 86.5% for the treatments of 1∶4, 1∶2 and 1∶1 of nano-Fe₃O₄/BC composites, respectively, while the treatments of single nano-Fe₃O₄ and single BC only reduced the TCH concentrations by 67.7% and 61.8%, respectively. The presence of HCO₃^- and H₂PO₄^- significantly inhibited the degradation of TCH, with HCO₃^- having a stronger inhibitory effect than that of H₂PO₄^-, but the presence of HCO₃^- and H₂PO₄^- accelerated the degradation of TCH. The results from the scavenging experiment and EPR measurement showed that ¹O₂ was the main active substance, followed by ·OH. When reused for the third time, the removal rates of TCH by the 1∶4, 1∶2 and 1∶1 nano-Fe₃O₄/BC composite treatments were still higher than 70%. Therefore, nano-Fe₃O₄/BC composite material is a potential PS activator that can achieve rapid oxidative degradation of TCH.

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