采用溶剂热法制备了玻璃纤维负载Fe₃O₄纳米颗粒膜(FOGF)非均相光芬顿催化剂,利用XRD、SEM、EDX、TEM等对材料结构和形貌进行表征;在模拟太阳光辐照下,考查了pH、H₂O₂用量、四环素初始质量浓度、FOGF质量对光芬顿降解四环素(TC)的影响,并进行了准一级动力学模拟。结果表明,在pH为6、H₂O₂用量为0.3 mL、FOGF质量为0.2 g、四环素初始质量浓度为20 mg/L时,反应120 min后四环素降解率达到99.5%,速率常数达4.57×10^-2 min^-1。FOGF在高pH时也表现出较高活性,pH为8时反应120 min后降解率为88%。FOGF表现出良好的稳定性,经过6次四环素降解循环反应,催化活性和降解效率均无明显衰减。自由基捕获实验证明,·OH自由基和空穴h⁺是主要降解活性物质。

Glassfiber supported Fe₃O₄ nanoparticle film (FOGF) is prepared as a heterogeneous photo-Fenton catalyst by solvothermal method,and characterized by means of XRD,SEM,EDX,and TEM.Influences of pH,H₂O₂ concentration,initial tetracycline concentration,and FOGF dosage on photo-Fenton degradation of tetracycline are evaluated under the irradiation of simulated sunlight,and first-order kinetic simulations are systematically investigated too.It is found that the degradation rate of tetracycline reaches 99.5% after 120 min,with a rate constant of 4.57×10^-2 min^-1 when pH=7,the dosage of H₂O₂ is 0.3 mL,the dosage of FOGF is 0.2 g,the initial concentration of tetracycline is 20 mg·L^-1.FOGF also exhibits a high catalytic activity at a high pH value.The degradation rate of tetracycline achieves 88% within 2 hours at pH=8.FOGF shows an excellent catalytic stability.After having experienced for six cycles of tetracycline degradation,its catalytic activity and degrading efficiency have not obvious decay.It is confirmed through radicals trapping experiments that ·OH radicals and holes are the main active substances for degradation.

吴奥(2001-),男,本科生,研究方向为环境纳米材料,1241665253@qq.com