Department of Chemical Engineering & Shah Schulman Center for Surface Science and Nanotechnology, Dharmsinh Desai University, College Road, Nadiad, Gujarat, 387 001, India.
Discipline of Inorganic Materials and Catalysis, Central Salt and Marine Chemicals Research Institute, Council of Scientific and Industrial Research (CSIR), G. B. Marg, Bhavnagar, Gujarat, 364002, India.
Photochem Photobiol Sci. 2022 Jan;21(1):77-89. doi: 10.1007/s43630-021-00141-8. Epub 2021 Nov 28.
The degradation performance of Cu-TiO nanomaterials towards levofloxacin (LFX) antibiotic was investigated under an environmentally benign visible LED light source. Cu-TiO nanomaterials were prepared using the reverse micelle sol-gel method with different copper content ranging from 0.25 to 1.0 wt% concerning titania. Characterization of Cu-TiO samples was performed by XRD, TEM, UV-Vis, BET, ICP-MS, FTIR and XPS techniques. 0.5 wt% Cu-TiO showed crystallite size below 6 nm, surface area (69.85 m/g) and significant visible light absorption capacity. Both Cu and Cu are formed in lower Cu-doped TiO samples, whereas only Cu is present in higher Cu-doped TiO samples as evident in XPS analysis. 0.5 wt% Cu-TiO has shown the optimum photocatalytic degradation of 75.5% under 6 h. of a visible light source. FTIR analysis of LFX adsorbed Cu-TiO materials indicated the pollutant-catalyst interaction, where the declining trend was observed in photocatalytic degradation efficiency for higher Cu-doped TiO samples due to copper-LFX complex formation. Copper-LFX complexes are formed due to the presence of Cu in higher Cu-doped TiO nanomaterials, which might have hindered the photocatalytic activity under visible light. Effects of initial pollutant concentration, catalyst loading and visible light intensity on the degradation of LFX are studied. Photocatalytic degradation pathways of LFX using best performing Cu-TiO material were also proposed based on the LC-MS analysis.
采用反胶束溶胶-凝胶法制备了不同铜含量（0.25-1.0wt%，相对于 TiO ）的 Cu-TiO 纳米材料，在环境友好的可见光 LED 光源下研究了 Cu-TiO 纳米材料对左氧氟沙星（LFX）抗生素的降解性能。采用 XRD、TEM、UV-Vis、BET、ICP-MS、FTIR 和 XPS 技术对 Cu-TiO 样品进行了表征。0.5wt%Cu-TiO 表现出低于 6nm 的晶粒尺寸、表面积（69.85m/g）和显著的可见光吸收能力。在较低 Cu 掺杂 TiO 样品中形成了 Cu 和 Cu，而在较高 Cu 掺杂 TiO 样品中仅存在 Cu，XPS 分析证实了这一点。在 6 小时的可见光照射下，0.5wt%Cu-TiO 表现出最佳的 75.5%光催化降解性能。LFX 吸附在 Cu-TiO 材料上的 FTIR 分析表明了污染物-催化剂的相互作用，对于更高 Cu 掺杂的 TiO 样品，由于铜-LFX 配合物的形成，光催化降解效率呈现下降趋势。由于较高 Cu 掺杂的 TiO 纳米材料中存在 Cu，形成了铜-LFX 配合物，这可能阻碍了可见光下的光催化活性。研究了初始污染物浓度、催化剂负载量和可见光强度对 LFX 降解的影响。还根据 LC-MS 分析提出了使用最佳性能的 Cu-TiO 材料对 LFX 进行光催化降解的途径。
