Fe-SBA-15强化H₂O₂/O₃耦合氧化高浓度苯酚的矿化性能研究

Enhanced Mineralization of High-Concentration Phenol by an Fe-SBA-15-Assisted H₂O₂/O₃ Oxidation Process

摘要: 为提高高浓度有机污染物在臭氧氧化过程中的深度矿化效率，采用水热共缩合法制备Fe-SBA-15介孔催化材料，并通过X射线衍射(XRD)、扫描电子显微镜(SEM)、N₂吸附–脱附和紫外–可见漫反射光谱(UV-vis DRS)对其结构和Fe物种状态进行表征。结果表明，Fe的引入未破坏SBA-15的典型介孔结构，Fe-SBA-15的比表面积、平均孔径和孔容分别达到716 m²/g、6.3 nm和1.12 cm³/g；约250 nm处的特征吸收带支持Fe以高分散骨架型物种存在。以250 mg/L苯酚为模型污染物，考察不同氧化体系的矿化性能。在60 min内，Fe-SBA-15/O₃和Fe-SBA-15/H₂O₂体系的TOC去除率分别仅约10%和16%，H₂O₂/O₃体系约为35%；当Fe-SBA-15与H₂O₂/O₃耦合后，TOC去除率提高至约60%，为无催化剂H₂O₂/O₃体系的约1.7倍。结果表明，Fe-SBA-15对单一O₃或H₂O₂的促进作用有限，但能够显著强化H₂O₂/O₃耦合氧化过程。该增强效应可能与骨架Fe位点促进H₂O₂/O₃界面反应以及提高活性氧物种利用效率有关。本研究为介孔Fe基材料强化peroxone过程处理高有机负荷废水提供了实验依据。

Abstract: Fe-SBA-15 mesoporous material was synthesized by a hydrothermal co-condensation route and characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), N₂ adsorption-desorption, and UV-vis diffuse reflectance spectroscopy (UV-vis DRS). The incorporation of Fe preserved the mesoporous structure of SBA-15, while the Fe-SBA-15 sample exhibited a specific surface area of 716 m²/g, an average pore size of 6.3 nm, and a pore volume of 1.12 cm³/g. A characteristic absorption band around 250 nm supported the presence of highly dispersed framework-like Fe species. Using phenol (250 mg/L) as a model pollutant, the mineralization performances of different oxidation systems were compared. After 60 min, TOC removal was only approximately 10% for Fe-SBA-15/O₃ and 16% for Fe-SBA-15/H₂O₂, whereas the conventional H₂O₂/ O₃ process achieved approximately 35%. In contrast, the coupled Fe-SBA-15/H₂O₂/O₃ system increased TOC removal to approximately 60%, corresponding to about 1.7 times that of H₂O₂/O₃ without the catalyst. These results indicate that Fe-SBA-15 shows limited promotion toward either O₃ or H₂O₂ alone but markedly enhances the coupled H₂O₂/O₃ oxidation process. The enhanced performance may be associated with the ability of framework Fe sites to facilitate interfacial H₂O₂/O₃ reactions and improve the utilization efficiency of reactive oxygen species. This work provides a simple strategy for strengthening peroxone treatment under high organic loading.