Non-radical pathway dominated highly efficient degradation of norfloxacin using persulfate activation with iron-based biochar
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摘要:
近年来,环境中新污染物的去除备受关注。其中抗生素诺氟沙星作为一种典型的新污染物,能够大量富集于土壤中,威胁到人类健康。已有研究表明,众多去除手段中,铁基生物炭活化强氧化剂的方式是一种高效、廉价的原位去除手段。铁的含量、价态和负载情况是影响催化活性的关键因素。然而,如何将去除能力最大化还尚未探明。因此,针对土壤中的典型抗生素诺氟沙星,系统研究了铁基生物炭热解温度和生物质粒径对诺氟沙星的高效去除能力的影响。采用批实验获得了不同铁基生物炭对诺氟沙星的降解效率和能力;通过自由基淬灭实验结合多种表征探讨了诺氟沙星降解的关键机制。结果表明,热解温度900 °C、生物质粒径为75~150 μm时制备出的铁基生物炭能够在10 min内完全降解诺氟沙星,并且3次使用后仍能保持50%的降解能力。通过作用机制分析,说明诺氟沙星的降解机制是由单线态氧主导的非自由基途径,硫酸根自由基和羟基自由基起辅助作用。研究构建的催化氧化体系对诺氟沙星降解效率高,对环境pH适用性强,二次污染风险低,有望用于土壤中诺氟沙星类污染的修复。
Abstract:In recent years, the removal of new pollutants has been widely concerned. The antibiotic norfloxacin, a typical emerging contaminant, is capable of concentrating in large quantities in the soil and threatening human health. It has been shown that among many removal means, the activation of strong oxidants by iron-based biochar is an efficient and inexpensive in-situ removal method. The content, valence, and loading of iron are the key factors affecting the catalytic activity; however, how to maximize its removal capacity has not been explored yet. This study systematically investigated the effects of pyrolysis temperature and biomass particle size of iron-based biochar on the efficient removal of norfloxacin, a typical antibiotic in soil. The degradation efficiency and capacity of different iron-based biochar for norfloxacin were obtained using batch experiments; the key mechanisms of norfloxacin degradation were explored by free radical quenching experiments combined with multiple characterizations. The results show that the iron-based biochar prepared at 900 °C pyrolysis temperature and small biomass particle size (75~150 μm) exhibit the best removal efficiency and is able to degrade norfloxacin completely within 10 min. Furthermore, it can maintain a 50% degradation capacity after three times use. The mechanism analysis indicates that the non-radical pathway dominates this degradation process by singlet oxygen, while the sulfate and hydroxyl radicals play auxiliary roles. The catalytic oxidation system constructed in this study has high degradation efficiency of norfloxacin, high applicability to environmental pH, and low risk of secondary contamination. It is expected to be used for the remediation of norfloxacin-type contamination in the soil.
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Key words:
- iron-based biochar /
- persulfate /
- antibiotics /
- pyrolysis temperature /
- biomass particle size /
- non-radical pathway
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