Mai Nguyen Thi, Thanh Hoa Le Thi, Van Thanh Dang, Huy Nguyen Nhat, Trang Hoang Minh, Van Son Tran, Thuy Pham Thi, An Hang Nguyen Thi, Minh Hang Tran Thi, Khai Nguyen Manh
Thai Nguyen University of Agriculture and Forestry Quyet Thang Thai Nguyen Vietnam.
Faculty of Environmental Sciences, University of Science, Vietnam National University Hanoi, 334 Nguyen Trai, Thanh Xuan Hanoi Vietnam.
RSC Adv. 2025 Aug 20;15(36):29367-29376. doi: 10.1039/d5ra04400f. eCollection 2025 Aug 18.
In this study, we present a facile integration of red mud-derived metal oxides into graphene sheets an electrochemical method, and we demonstrate its application for sonodegradation of sulfamethoxazole (SMX) in water. The resulting red mud-derived metal oxides/graphene composite (RAG) has a porous structure (with a specific surface area of 42.08 m g) and contains metal oxides (, TiO, AlO, and FeO) and SiO anchored on the surface of the exfoliated graphite flakes oxygen bridges (, C-O-Ti/Al/Fe). The produced nanocomposites contained Fe and Fe with a vital role in sonochemical degradation and the oxygen-containing groups such as COOH, C-O-C, and C[double bond, length as m-dash]O for attracting the pollutant molecules to the catalyst surface. The investigated results of SMX degradation indicated an excellent performance of the synthesized RAGs with the highest SMX degradation efficiency of 91.5% at pH 7, SMX initial concentration of 10 mg L, catalyst dosage of 0.5 g L, volume of 100 mL, temperature of 313 K, and reaction time of 180 min. Besides, the SMX degradation can occur at a wide pH range of 3-7, suggesting a potential solution for removing antibiotic pollutants in environmental remediation.
在本研究中，我们通过一种电化学方法，将源自赤泥的金属氧化物简便地整合到石墨烯片中，并展示了其在水中声降解磺胺甲恶唑（SMX）的应用。所得的源自赤泥的金属氧化物/石墨烯复合材料（RAG）具有多孔结构（比表面积为42.08 m²/g），且包含锚定在剥落石墨片表面的金属氧化物（TiO₂、Al₂O₃和Fe₂O₃）以及SiO₂，通过氧桥（如C-O-Ti/Al/Fe）相连。所制备的纳米复合材料含有Fe²⁺和Fe³⁺，它们在声化学降解中起着至关重要的作用，还有诸如COOH、C-O-C和C=O等含氧基团，可将污染物分子吸引到催化剂表面。磺胺甲恶唑降解的研究结果表明，合成的RAGs具有优异的性能，在pH值为7、SMX初始浓度为10 mg/L、催化剂用量为0.5 g/L、体积为100 mL、温度为313 K以及反应时间为180分钟的条件下，SMX的最高降解效率达到91.5%。此外，SMX在3 - 7的宽pH范围内均可发生降解，这表明在环境修复中去除抗生素污染物方面具有潜在的解决方案。
