磁性Fe_3O_4/石墨烯纳米复合材料催化降解水中17β-雌二醇

Catalytic degradation of 17β-estradiol in aqueous solution by magnetic Fe_3O_4/ graphene nanocomposite

利用化学沉淀法制备磁性四氧化三铁/石墨烯(Fe3O4/GE)纳米复合材料,并将其与H2O2构成非均相Fenton体系用于催化降解水中微量的17β-雌二醇(E2),研究了初始p H值,初始H2O2浓度,催化剂用量对E2降解的影响。结果表明,Fe3O4/GE纳米复合材料在无需外加光源的条件下能够有效催化降解E2。在p H 7.0,E2初始浓度为1 mg/L,初始H2O2浓度为15 mmol/L,Fe3O4/GE投加量为15 mg/L的条件下,反应8 h后可去除92.9%的E2。Fe3O4/GE具有便捷的磁分离特性和稳定的催化活性,经过7次循环使用后对E2的降解效率仍保持在91.5%左右。

Magnetic Fe3O4/ graphene( Fe3O4/ GE) nanocomposite was prepared via chemical precipitation method and applied as heterogeneous Fenton catalyst for catalytic degradation of trace 17β-estradiol( E2) in aqueous solution in the presence of H2O2. The effects of initial p H,initial H2O2 concentration and catalyst loading on the degradation of E2 were investigated. The results indicated that Fe3O4/ GE has effective catalytic degradation ability for E2 in the batch degradation experiments without external light source. When p H = 7. 0,initial E2 concentration was 1 mg / L,initial H2O2 concentration was 15 mmol / L,Fe3O4/ GE dosage was 15 mg / L,92. 9%of E2 could be removed after 8 h. In addition,Fe3O4/ GE showed convenient magnetic separation property and stable catalytic activity. The degradation efficiency of E2 still remained at around 91. 5% even after 7recycling use.