In this work, phosphotungstic acid (PW)-based magnetic nanocomposite (Fe@ZnO/PW) was synthesized, characterized and used as a recyclable photocatalyst for bacterial inactivation of pathogenic E. Coli bacterium under LED lamps as a light source. Different characterization methods (X-ray diffraction (XRD), field emission scanning electron microscope (FE-SEM), vibrating sample magnetometer (VSM), BET surface area and pore volume and UV-vis absorption spectra) were used to characterize the synthesized Fe@ZnO and Fe@ZnO/PW magnetic nanocomposites. The Fe@ZnO/PW nanocomposite retaining magnetic properties was easily separated using an external magnet. Fe@ZnO/PW could completely inactivate 10⁷ cfu/ml of E. coli after 2 h of irradiation time. Considerably, Fe@ZnO/PW photocatalyst exhibited good stability and no reduction of its photocatalytic bacterial inactivation performance was observed even after six successive cycles.

在这项工作中，基于磷钨酸（PW）的磁性纳米复合材料（Fe @ ZnO / PW）进行了合成，表征并用作可再生的光催化剂，用于在LED灯为光源下灭活致病性大肠杆菌。使用不同的表征方法（X射线衍射（XRD），场发射扫描电子显微镜（FE-SEM），振动样品磁力计（VSM），BET表面积和孔体积以及UV-vis吸收光谱）表征合成的Fe ZnO和Fe @ ZnO / PW磁性纳米复合材料。保留磁性的Fe @ ZnO / PW纳米复合材料很容易使用外部磁体分离。Fe @ ZnO / PW可以完全灭活10 ⁷ cfu / ml的大肠杆菌照射时间2小时后。Fe @ ZnO / PW光催化剂表现出良好的稳定性，即使连续六个循环也未观察到其光催化细菌灭活性能的降低。