Enhanced Oxidation of Antibiotics by Ferrate Mediated with Natural Organic Matter: Role of Phenolic Moieties
Enhanced Oxidation of Antibiotics by Ferrate Mediated with Natural Organic Matter: Role of Phenolic Moieties
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DOI：
10.1021/acs.est.3c03165
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发表时间：
2023-06
影响因子：
11.4
通讯作者：
B. Guo;Junyue Wang;K. Sathiyan;Xingmao Ma;E. Lichtfouse;Ching-Hua Huang;V. Sharma
中科院分区：
文献类型：
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作者：
B. Guo;Junyue Wang;K. Sathiyan;Xingmao Ma;E. Lichtfouse;Ching-Hua Huang;V. Sharma
水源中抗生素含量的增加威胁着公共健康和生态系统。以前已经应用各种处理来降解抗生素，但它们的效率通常受到水中天然有机物（NOM）的存在的阻碍。相反，我们在这里表明，9种类型的NOM和NOM模型化合物提高了去除甲氧苄啶和磺胺甲恶唑的高铁酸盐（VI）（FeVIO 42-，Fe（VI））在温和的碱性条件下。这可能与NOM中存在酚部分有关，如使用NOM、苯酚和对苯二酚的一级动力学所示。电子顺磁共振结果表明，在Fe（VI）-NOM体系中，NOM自由基通过单电子转移到Fe（VI）上，在几毫秒内生成Fe（V）。尽管Fe（V）和NOM部分、自由基和水之间同时发生反应，但Fe（V）与抗生素反应的优势导致其增强的去除。动力学模型考虑Fe（V）解释了在低苯酚浓度下抗生素减排的增强动力学。用湖泊和河流沃茨的腐殖酸和富里酸进行的实验显示了类似的结果，从而支持了在真实的水体中加强抗生素的消除。
The increasing presence of antibiotics in water sources threatens public health and ecosystems. Various treatments have been previously applied to degrade antibiotics, yet their efficiency is commonly hindered by the presence of natural organic matter (NOM) in water. On the contrary, we show here that nine types of NOM and NOM model compounds improved the removal of trimethoprim and sulfamethoxazole by ferrate(VI) (FeVIO42–, Fe(VI)) under mild alkaline conditions. This is probably associated with the presence of phenolic moieties in NOMs, as suggested by first-order kinetics using NOM, phenol, and hydroquinone. Electron paramagnetic resonance reveals that NOM radicals are generated within milliseconds in the Fe(VI)–NOM system via single-electron transfer from NOM to Fe(VI) with the formation of Fe(V). The dominance of the Fe(V) reaction with antibiotics resulted in their enhanced removal despite concurrent reactions between Fe(V) and NOM moieties, the radicals, and water. Kinetic modeling considering Fe(V) explains the enhanced kinetics of antibiotics abatement at low phenol concentrations. Experiments with humic and fulvic acids of lake and river waters show similar results, thus supporting the enhanced abatement of antibiotics in real water situations.