Department of Chemistry, College of Natural Sciences, Jeonbuk National University, Jeonju, Jeonbuk 54930, South Korea.
Department of Chemical Engineering, Waterloo Institute for Nanotechnology, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L3G1, Canada.
J Hazard Mater. 2021 Jun 15;412:125330. doi: 10.1016/j.jhazmat.2021.125330. Epub 2021 Feb 6.
A simulated visible light-mediated iron oxide-titania (IoT) nanocomposite was employed to degrade the antibiotic norfloxacin (NFN) photocatalytically. The photocatalyst were prepared using a sol-gel method with controlled titania loadings to iron oxide by altering the fabrications step. The nanocomposites were structurally characterized by field emission scanning electron microscopy (FE-SEM), energy-dispersive X-ray spectroscopy (EDX), field emission high-resolution transmission electron microscopy (HR-TEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, Diffuse reflectance UV-visible spectra (DRS-UV) spectroscopy, cyclic voltammetry, and X-ray photoelectron spectroscopy (XPS). It was observed that 100 mg/L of iron oxide doped titania loading at 1:4 (IoT-4) achieved the maximum photocatalytic activity in a 75 mg/100 mL of NFN solution within 60 min of the reaction time under visible light irradiation. The NFN degradation mechanism affirmed using HPLC-MS/MS analysis and the results confirmed the complete NFN degradation without residual intermediates. Significant, sustained recyclability was obtained by completely removing the contaminant up to 5 cycles with 90% degradation ability till nine cycles. Bacterial- and phytotoxicity data ascertain that the photocatalyzed and contaminant-free water is safe for the environment. The outstanding photocatalytic performance in removing organic pollutants indicates the potential application of IoT nanocomposites in real-time environmental remediation.
采用模拟可见光介导的氧化铁-二氧化钛（IoT）纳米复合材料进行光催化降解抗生素诺氟沙星（NFN）。采用溶胶-凝胶法制备光催化剂，通过改变制备步骤控制 TiO2 负载量到氧化铁。通过场发射扫描电子显微镜（FE-SEM）、能谱（EDX）、场发射高分辨率透射电子显微镜（HR-TEM）、X 射线衍射（XRD）、傅里叶变换红外（FT-IR）光谱、漫反射紫外可见光谱（DRS-UV）、循环伏安法和X 射线光电子能谱（XPS）对纳米复合材料进行结构表征。结果表明，在可见光照射下，反应时间为 60 min 时，100 mg/L 的氧化铁掺杂 TiO2 负载量为 1:4（IoT-4）在 75 mg/100 mL 的 NFN 溶液中表现出最大的光催化活性。使用 HPLC-MS/MS 分析证实了 NFN 的降解机制，结果表明 NFN 完全降解，没有残留中间产物。重要的是，通过完全去除污染物，在 5 个循环中获得了高达 90%的降解能力，直到 9 个循环，具有显著的、持续的可循环性。细菌和植物毒性数据表明，光催化和无污染物的水对环境是安全的。在去除有机污染物方面的出色光催化性能表明，IoT 纳米复合材料在实时环境修复方面具有潜在的应用。
