College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, People's Republic of China.
Research and Development Center for Watershed Environmental Eco-Engineering, Beijing Normal University, Zhuhai, People's Republic of China.
Environ Technol. 2024 Aug;45(19):3924-3939. doi: 10.1080/09593330.2023.2237658. Epub 2023 Jul 24.
The heterogeneous photo-Fenton system using Fe-Co/γ-AlO as a catalyst was applied in the study of sulfamethoxazole(SMX) degradation. The morphology, structure, elemental composition and metal valence distribution of Fe-Co/γ-AlO were found to be relatively stable before and after the reaction. The highest SMX degradation efficiency and mineralization (The ratio of organic matter being oxidized to carbon dioxide and water) were obtained under the conditions of 15% Fe-Co loading rate, 1:1 mass ratio of Fe and Co, 1 g/L catalyst dosage, 1.5 mL 30% HO dosage, 18 W UV lamp power and 60 min reaction time, which were 98% and 66%, respectively. Radical quenching experiments and electronic paramagnetic resonance (EPR) characterization revealed that ·OH played an important role in the degradation and mineralization SMX in the Fe-Co/γ-AlO heterogeneous photo-Fenton system. Combined with the analysis of N, S and intermediate products, there may be three degradation pathways of SMX in the heterogeneous photo-Fenton system. This work provides a technical reference for realizing the efficient degradation and mineralization of SMX in a heterogeneous photo-Fenton reaction system.
采用 Fe-Co/γ-Al2O3 为催化剂的非均相类 Fenton 体系用于研究磺胺甲恶唑（SMX）的降解。发现 Fe-Co/γ-Al2O3 在反应前后的形态、结构、元素组成和金属价态分布都相对稳定。在 15%Fe-Co 负载率、Fe 和 Co 质量比为 1:1、催化剂用量为 1 g/L、30%HO 用量为 1.5 mL、18 W UV 灯功率和 60 min 反应时间的条件下，SMX 的最高降解效率和矿化率（有机物质被氧化为二氧化碳和水的比例）分别达到 98%和 66%。自由基猝灭实验和电子顺磁共振（EPR）表征表明，·OH 在 Fe-Co/γ-Al2O3 非均相光 Fenton 体系中降解和矿化 SMX 中发挥了重要作用。结合对 N、S 和中间产物的分析，SMX 在非均相光 Fenton 体系中可能存在三种降解途径。这项工作为实现 SMX 在非均相光 Fenton 反应体系中的高效降解和矿化提供了技术参考。
