Collaborative Innovation Center for Advanced Nuclear Energy Technology, INET, Tsinghua University, Beijing, 100084, People's Republic of China; Beijing Key Laboratory of Radioactive Waste Treatment, Tsinghua University, Beijing, 100084, China.
Collaborative Innovation Center for Advanced Nuclear Energy Technology, INET, Tsinghua University, Beijing, 100084, People's Republic of China; Beijing Key Laboratory of Radioactive Waste Treatment, Tsinghua University, Beijing, 100084, China.
Chemosphere. 2019 Nov;234:14-24. doi: 10.1016/j.chemosphere.2019.06.014. Epub 2019 Jun 8.
In this study, FeO/CoO composites were prepared and applied in the catalytic ozonation of sulfamethoxazole (SMX). Various parameters including initial solution pH, FeO/CoO composites dose, O dose and SMX concentration were investigated. Results showed that FeO/CoO composites could significantly improve the mineralization of SMX by catalytic ozonation system and a synergic effect between FeO and CoO was observed. Only about 16% total organic carbon (TOC) could be removed in 60 min by single ozonation under the condition of 20 mg/L SMX, 6.0 mg/min O, pH 5.1 and room temperature, While in the presence of 0.10 g/L FeO/CoO composites at the same conditions, 60% TOC removal were obtained by catalytic ozonation process. SMX could be degradation by O rapidly and the removal was not significantly affected by the changing parameters. However, those operating parameters exerted different effects on SMX mineralization. Furthermore, the generation of hydroxyl radicals (OH) and the utilization efficiency of O would increase with the addition of FeO/CoO composites. The quenching experiments indicated that OH might account for the enhancement of SMX mineralization and the mechanism of catalytic ozonation was proposed. Additionally, the intermediates were detected by using a high-performance liquid chromatography-mass spectrometry (LC-MS), from which some plausible transformation pathways were proposed.
在这项研究中，制备了 FeO/CoO 复合材料，并将其应用于催化臭氧化磺胺甲恶唑（SMX）中。研究了初始溶液 pH 值、FeO/CoO 复合材料剂量、O 剂量和 SMX 浓度等各种参数。结果表明，FeO/CoO 复合材料可以显著提高催化臭氧化体系中 SMX 的矿化程度，并观察到 FeO 和 CoO 之间存在协同效应。在 20mg/L SMX、6.0mg/min O、pH5.1 和室温条件下，单独臭氧化 60min 只能去除约 16%的总有机碳（TOC），而在相同条件下添加 0.10g/L FeO/CoO 复合材料时，催化臭氧化过程可去除 60%的 TOC。O 可以迅速降解 SMX，且去除率不受参数变化的显著影响。然而，这些操作参数对 SMX 的矿化有不同的影响。此外，随着 FeO/CoO 复合材料的添加，羟基自由基（OH）的生成和 O 的利用率会增加。猝灭实验表明，OH 可能是 SMX 矿化增强的原因，并提出了催化臭氧化的机理。此外，通过高效液相色谱-质谱联用（LC-MS）检测到了中间产物，从中提出了一些可能的转化途径。
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