Nanomaterials and Nanotechnology Department, Advanced Materials Institute, Central Metallurgical R&D Institute (CMRDI), P.O. Box 87, Helwan, 11421, Cairo, Egypt.
Chemistry Department, Faculty of Science, King Abdulaziz University, P.O. Box 80200, Jeddah, 21589, Saudi Arabia.
Environ Res. 2022 Oct;213:113718. doi: 10.1016/j.envres.2022.113718. Epub 2022 Jun 22.
The supper dissemination of antibiotic waste in water resources has exponentially progressed the vital water and soil pollution that affect human health and the environment. Consequently, there have been several types of research anticipated for the green mineralization of such pollutants. Herein, we intended a surfactant-aided sol-gel formation of lanthanum-doped sodium tantalate (LNTO) nanocrystals. The synthesized 13 nm averaged-size perovskite LNTO nanocrystals were responsive to visible-light irradiation by incorporation of 4.4-5.2 nm oxide nanoparticles, namely BiO, CdO, FeO, and CuO at 4.0 wt% through coprecipitation. The formed nanomaterials unveiled mesostructured surface textures with specific surface areas of 199-229 m g. The obtained nanoceramics were employed for the mineralization of 10 ppm of ciprofloxacin antibiotic (CPF) as an emerging antibiotic waste in water under visible light irradiation. The CuO-incorporated LNTO exhibited the best photocatalytic oxidation of CPF after 120 min compared with other oxides with an excellent photoreaction rate of 0.0343 min which is 49 times higher than the pure LNTO. The 2.0 gL CuO/LNTO-dose achieved the full photooxidation of CPF at an oxidation speed of 0.0738 min within just 1.0 h of visible light irradiation and magnificent regeneration ability. This enhanced activity of CuO/LNTO is regarded as significant light absorption and a bandgap energy reduction to 2.12 eV. Besides that, the heterojunction between CuO and LNTO amended the photogenerated carrier mobility and separation as concluded from the photoluminescence and photocurrent exploration. This comparative work suggests the proper design of low bandgap oxide decoration of solution-based perovskite oxide photocatalysts for promoting the visible-light mineralization of antibiotics in water.
抗生素废物在水资源中的过度传播极大地加剧了对人类健康和环境造成影响的重要水污染和土壤污染。因此，已经有几种类型的研究预期用于此类污染物的绿色矿化。在此，我们意图通过表面活性剂辅助溶胶-凝胶法形成镧掺杂的钽酸钠（LNTO）纳米晶。所合成的平均粒径为 13nm 的钙钛矿 LNTO 纳米晶通过共沉淀掺入 4.4-5.2nm 的氧化物纳米粒子（即 BiO、CdO、FeO 和 CuO），在 4.0wt%时对可见光照射有响应。形成的纳米材料具有介孔表面纹理，比表面积为 199-229m g。将获得的纳米陶瓷用于在可见光照射下将 10ppm 的环丙沙星抗生素（CPF）作为新兴抗生素废物矿化。与其他氧化物相比，掺入 CuO 的 LNTO 在 120min 后显示出 CPF 的最佳光催化氧化作用，具有出色的光反应速率为 0.0343min，比纯 LNTO 高 49 倍。在 2.0gL CuO/LNTO 剂量下，在可见光照射 1.0h 内即可实现 CPF 的完全光氧化，氧化速度为 0.0738min，具有出色的再生能力。CuO/LNTO 的这种增强活性归因于显著的光吸收和带隙能降低至 2.12eV。除此之外，CuO 和 LNTO 之间的异质结改善了光生载流子的迁移率和分离，这从光致发光和光电流研究中可以得出结论。这项比较工作表明，适当设计基于溶液的钙钛矿氧化物光催化剂的低带隙氧化物修饰，可促进水中抗生素的可见光矿化。
