Abstract Magnetic Fe@Al-ZnO nanocomposite was systhesized through a facile two-step precipitation process for the first time, and employed as a highly active photocatalyst for visible-light-driven (VLD) inactivation of Escherichia coli. The as-synthesized nanocomposite was analyzed using X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), scanning electron microscope (SEM), vibrating sample magnetometer (VSM), X-ray photoelectron spectroscopy (XPS), UV–vis diffused reflectance spectra (UV–vis DRS) and photoluminescence (PL) spectra. The Fe@Al-ZnO photocatalysts displayed typical ferromagnetic property with the saturation magnetization of 35.2 emu/g, which predominantly facilitated magnetic separation and recycling in applications. The photocatalyst dosage was found to have a significant influence on the VLD photocatalytic bacterial inactivation activity of Fe@Al-ZnO. Under visible-light irradiation, 40 mg of Fe@Al-ZnO could entirely inactivate 7-log of bacterial cells in 5 h. Notably, the phase structure and magnetic property of the nanocomposite after photocatalysis exhibited almost no evident change compared with that before photocatalysis, indicating excellent stability of Fe@Al-ZnO photocatalyst. Due to the privileges of facile preparation, relatively low cost, powerful photocatalytic efficiency, excellent stability as well as magnetic recovery property, Fe@Al-ZnO nanocomposite was anticipated to possess remarkable potential in VLD photocatalytic inactivation of bacteria.

中文翻译：

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可见光下用于光催化细菌灭活的磁性Fe@Al-ZnO纳米复合材料的简便合成

摘要 首次通过简便的两步沉淀法合成了磁性 Fe@Al-ZnO 纳米复合材料，并将其用作可见光驱动 (VLD) 灭活大肠杆菌的高活性光催化剂。使用 X 射线衍射 (XRD)、Brunauer-Emmett-Teller (BET)、扫描电子显微镜 (SEM)、振动样品磁强计 (VSM)、X 射线光电子能谱 (XPS)、UV–可见漫反射光谱（UV-vis DRS）和光致发光（PL）光谱。Fe@Al-ZnO 光催化剂表现出典型的铁磁性，饱和磁化强度为 35.2 emu/g，这在应用中主要有利于磁分离和回收。发现光催化剂用量对 Fe@Al-ZnO 的 VLD 光催化细菌灭活活性有显着影响。在可见光照射下，40 mg Fe@Al-ZnO 可以在 5 小时内完全灭活 7-log 的细菌细胞。值得注意的是，光催化后纳米复合材料的相结构和磁性能与光催化前相比几乎没有明显变化，表明 Fe@Al-ZnO 光催化剂具有优异的稳定性。Fe@Al-ZnO纳米复合材料由于制备简便、成本相对较低、光催化效率高、稳定性好以及磁回收性能好等优点，有望在VLD光催化灭活细菌方面具有显着的潜力。40 mg Fe@Al-ZnO 可以在 5 小时内完全灭活 7-log 的细菌细胞。值得注意的是，光催化后纳米复合材料的相结构和磁性能与光催化前相比几乎没有明显变化，表明 Fe@Al-ZnO 光催化剂具有优异的稳定性。Fe@Al-ZnO纳米复合材料由于制备简便、成本相对较低、光催化效率高、稳定性好以及磁回收性能好等优点，有望在VLD光催化灭活细菌方面具有显着的潜力。40 mg Fe@Al-ZnO 可以在 5 小时内完全灭活 7-log 的细菌细胞。值得注意的是，光催化后纳米复合材料的相结构和磁性能与光催化前相比几乎没有明显变化，表明 Fe@Al-ZnO 光催化剂具有优异的稳定性。Fe@Al-ZnO纳米复合材料由于制备简便、成本相对较低、光催化效率高、稳定性好以及磁回收性能好等优点，有望在VLD光催化灭活细菌方面具有显着的潜力。