Department of Inorganic Chemistry, Faculty of Natural Sciences, Comenius University Bratislava, Ilkovicova 6, Mlynska Dolina, 84215 Bratislava, Slovakia.
Institute of Environmental Technology, CEET, VSB-Technical University of Ostrava, 17. Listopadu 15/2172, 70800 Ostrava-Poruba, Czech Republic.
Molecules. 2022 Dec 16;27(24):8959. doi: 10.3390/molecules27248959.
The preparation of anodic TiO nanotube layers has been performed using electrochemical anodization of Ti foil for 4 h at different voltages (from 0 V to 80 V). In addition, a TiO thin layer has been also prepared using the sol-gel method. All the photocatalysts have been characterized by XRD, SEM, and DRS to investigate the crystalline phase composition, the surface morphology, and the optical properties, respectively. The performance of the photocatalyst has been assessed in versatile photocatalytic reactions including the reduction of NO gas and the oxidation of aqueous sulfamethoxazole. Due to their high specific surface area and excellent charge carriers transport, anodic TiO nanotube layers have exhibited the highest NO conversion rate (up to 10% after 22 h) and the highest degradation extent of sulfamethoxazole (about 65% after 4 h) under UVA light. The degradation mechanism of sulfamethoxazole has been investigated by analyzing its transformation products by LC-MS and the predominant role of hydroxyl radicals has been confirmed. Finally, the efficiency of the anodic TiO nanotube layer has been tested in real wastewater reaching up to 45% of sulfamethoxazole degradation after 4 h.
采用电化学阳极氧化法，以 Ti 箔为阳极，在不同电压（0 V 至 80 V）下氧化 4 h，制备了阳极 TiO 纳米管层。此外，还采用溶胶-凝胶法制备了 TiO 薄膜。通过 XRD、SEM 和 DRS 分别对所有光催化剂进行了表征，以研究其晶体相组成、表面形貌和光学性能。通过包括还原 NO 气体和氧化水溶液中磺胺甲恶唑在内的多种光催化反应评估了光催化剂的性能。由于具有高比表面积和优异的载流子输运性能，阳极 TiO 纳米管层在 UVA 光下表现出最高的 NO 转化率（22 h 后可达 10%）和磺胺甲恶唑的最高降解程度（4 h 后约 65%）。通过分析 LC-MS 得到的转化产物，研究了磺胺甲恶唑的降解机制，证实了羟基自由基的主要作用。最后，在实际废水中测试了阳极 TiO 纳米管层的效率，4 h 后磺胺甲恶唑的降解率达到 45%。
