Departamento de Química e Bioquímica, Faculdade de Ciências, ULisboa, 1749-016, Lisboa, Portugal; Laboratório de FTICR e Espectrometria de Massa Estrutural, Faculdade de Ciências, ULisboa, 1749-016, Lisboa, Portugal.
Centro de Química Estrutural, Faculdade de Ciências, ULisboa, 1749-016, Lisboa, Portugal.
Chemosphere. 2020 Nov;259:127486. doi: 10.1016/j.chemosphere.2020.127486. Epub 2020 Jul 1.
Titanate nanomaterials have been outstanding in the removal of emerging contaminants by the photocatalysis process. These photocatalysts, when modified through techniques such as doping with metals, they have advantages over TiO, especially in the region of visible light. In this work, the photocatalytic performance of four recent reported catalysts, pristine titanate nanowires, cobalt-doped titanate nanowires, iron-doped titanate nanowires and ruthenium-doped titanate nanowires, for the removal of the antidepressant trazodone under visible light radiation was compared. The iron-doped titanate nanowires presented the best catalytic activity by the catalyst surface area. Additionally, thirteen transformation products (TPs) were identified by high-resolution mass spectrometry and, to the best of our knowledge, nine of them have never been described in the literature. It was shown that for each catalyst different TPs were formed with distinct time profiles. Finally, toxicity assessment by computational methods showed that TPs were not readily biodegradable and they presented toxicity to aquatic organisms with mutagenic potential. These findings reinforce the importance of taking into consideration the TPs formed during the removal of pollutants since many of them may be toxic and can be produced during photocatalysis.
钛酸盐纳米材料在光催化过程中对新兴污染物的去除方面表现出色。这些光催化剂通过掺杂金属等技术进行改性后，与 TiO2 相比具有优势，尤其是在可见光区域。在这项工作中，比较了四种最近报道的催化剂（原始钛酸盐纳米线、钴掺杂钛酸盐纳米线、铁掺杂钛酸盐纳米线和钌掺杂钛酸盐纳米线）在可见光辐射下去除抗抑郁药曲唑酮的光催化性能。铁掺杂钛酸盐纳米线具有最大的比表面积，表现出最好的催化活性。此外，通过高分辨率质谱鉴定出 13 种转化产物（TPs），据我们所知，其中 9 种在文献中从未被描述过。结果表明，对于每种催化剂，不同的 TPs 以不同的时间曲线形成。最后，通过计算方法进行的毒性评估表明，TPs 不易生物降解，对水生生物具有潜在的致突变毒性。这些发现强调了在去除污染物过程中考虑形成的 TPs 的重要性，因为其中许多 TPs 可能具有毒性，并且可能在光催化过程中产生。
