In this study, the application of ZnFe₂O₄, Uio-66 nanoparticles and ZnFe₂O₄@Uio-66 photocatalytic nanocomposites, with different ratios of each component was synthesized and applied for the photocatalytic degradation of metronidazole (MNZ) antibiotic. The samples were characterized with (FTIR), (XRD), (SEM), (DLS), (VSM), and UV-Vis spectroscopy. The photocatalytic process was performed under visible light in an aqueous solution. The optical studies revealed that the addition of ZnFe₂O₄ nanoparticles could stimulate the activation wavelength of the nanocomposite, effectively shifting it to the visible light region, and correspondingly reduce the bandgap. To evaluate the ability of ZnFe₂O₄@Uio-66 magnetic nanocatalyst to degrade metronidazole, effective parameters such as the initial concentration of MNZ in aqueous solution(10–90 mg/L), pH(2–10), the illumination and darkness time and photocatalyst dosage(0.01–0.05 g) were investigated and optimized. It was observed that when ZnFe₂O₄ concentration was twice that of Uio-66, the degradation efficiency increased. The optimum degradation conditions, at which 93.7% degradation efficiency was achieved, were determined at 120 min brightness, 40 min darkness, pH = 8, initial concentration of 10 ppm, and photocatalyst content of 0.03 g. Based on the results of photocatalytic degradation kinetics, all the samples followed the Langmuir-Hinshelwood pseudo-first-order kinetics model.

本研究应用ZnFe ₂ O ₄、Uio-66纳米粒子和ZnFe ₂ O ₄ @Uio-66光催化纳米复合材料，合成了各组分不同比例的光催化降解甲硝唑（MNZ）抗生素。用(FTIR)、(XRD)、(SEM)、(DLS)、(VSM)和UV-Vis光谱对样品进行表征。光催化过程在可见光下在水溶液中进行。光学研究表明，添加 ZnFe ₂ O ₄纳米粒子可以激发纳米复合材料的活化波长，有效地将其转移到可见光区域，并相应地减小带隙。为评估 ZnFe ₂ O ₄ @Uio-66 磁性纳米催化剂降解甲硝唑的能力，MNZ 在水溶液中的初始浓度（10-90 mg/L）、pH（2-10）、光照和研究并优化了黑暗时间和光催化剂用量（0.01-0.05 g）。据观察，当 ZnFe ₂ O ₄浓度是 Uio-66 的两倍，降解效率提高。在亮度为 120 分钟、黑暗为 40 分钟、pH = 8、初始浓度为 10 ppm、光催化剂含量为 0.03 g 时确定了达到 93.7% 降解效率的最佳降解条件。基于光催化降解动力学结果，所有样品均遵循 Langmuir-Hinshelwood 准一级动力学模型。