Barrocas B T, Osawa R, Oliveira M Conceição, Monteiro O C
Centro de Química Estrutural, Institute of Molecular Sciences, Departamento de Química e Bioquímica, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal.
FT-ICR and Structural Mass Spectrometry Laboratory, MARE-Marine and Environmental Sciences Centre, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisboa, Portugal.
Materials (Basel). 2023 Mar 1;16(5):2051. doi: 10.3390/ma16052051.
Aiming to improve their photocatalytic performance, titanate nanowires (TNW) were modified by Fe and Co (co)-doping, FeTNW, CoTNW and CoFeTNW samples, using a hydrothermal methodology. XRD characterization agrees with the existence of Fe and Co in the lattice structure.and the existence of Co together with the presence of Fe and Fe in the structure was confirmed by XPS. The optical characterization of the modified powders shows the impact of the - transitions of both metals in the absorption properties of TNW, mainly in the creation of additional 3 energetic levels within the prohibited zone. The effect of the doping metal(s) in the recombination rate of photo-generated charge carriers suggests a higher impact of Fe presence when compared to Co. The photocatalytic characterization of the prepared samples was evaluated via the removal of acetaminophen. Furthermore, a mixture containing both acetaminophen and caffeine, a well-known commercial combination, was also tested. CoFeTNW sample was the best photocatalyst for the degradation of acetaminophen in both situations. A mechanism for the photo-activation of the modified semiconductor is discussed and a model proposed. It was concluded that both Co and Fe are essential, within the TNW structure, for the successful removal of acetaminophen and caffeine.
为了提高钛酸盐纳米线（TNW）的光催化性能，采用水热法通过铁（Fe）和钴（Co）共掺杂对其进行改性，制备了FeTNW、CoTNW和CoFeTNW样品。X射线衍射（XRD）表征结果表明晶格结构中存在Fe和Co，X射线光电子能谱（XPS）证实了结构中Co与Fe的共存。改性粉末的光学表征显示了两种金属的跃迁对TNW吸收特性的影响，主要是在禁带内产生了额外的三个能级。掺杂金属对光生电荷载流子复合率的影响表明，与Co相比，Fe的存在影响更大。通过对乙酰氨基酚的去除来评估所制备样品的光催化性能。此外，还测试了一种含有乙酰氨基酚和咖啡因（一种著名的商业组合）的混合物。在两种情况下，CoFeTNW样品都是降解乙酰氨基酚的最佳光催化剂。本文讨论了改性半导体的光活化机理并提出了一个模型。得出的结论是，在TNW结构中，Co和Fe对于成功去除乙酰氨基酚和咖啡因都是必不可少的。
