Enhanced photodegradation of acetaminophen over Sr@TiO2/UiO-66-NH2 heterostructures under solar light irradiation
ovel Sr@TiO2/UiO-66-NH2 heterostructures were synthesized by a two-step solvothermal approach and tested as photocatalysts for the solar degradation of acetaminophen. Strontium titanate was used as precursor to obtain the heterostructures, resulting in Sr@TiO2 anchored and dispersed on the UiO-66-NH...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2022 |
| País: | España |
| Institución: | Universidad Autónoma de Madrid |
| Repositorio: | Biblos-e Archivo. Repositorio Institucional de la UAM |
| Idioma: | inglés |
| OAI Identifier: | oai:repositorio.uam.es:10486/703316 |
| Acceso en línea: | http://hdl.handle.net/10486/703316 https://dx.doi.org/10.1016/j.cej.2022.137229 |
| Access Level: | acceso abierto |
| Palabra clave: | Acetaminophen Continuous reaction Photocatalytic degradation Solar light Sr@TiO /UiO-66-NH 2 2 Química |
| Sumario: | ovel Sr@TiO2/UiO-66-NH2 heterostructures were synthesized by a two-step solvothermal approach and tested as photocatalysts for the solar degradation of acetaminophen. Strontium titanate was used as precursor to obtain the heterostructures, resulting in Sr@TiO2 anchored and dispersed on the UiO-66-NH2. The effect of the Sr@TiO2:UiO-66-NH2 ratio was analyzed. All the heterostructures were more active than the pattern UiO-66-NH2, and the most active achieved more than 90% of conversion of acetaminophen. This enhanced degradation was ascribed to a better separation and faster transfer of charges, as confirmed by photoluminescence and electrochemical characterization. Radical trapping experiments revealed that superoxide radicals (O2•−) and to a lower extent photoinduced holes (h+) were involved in acetaminophen degradation. As a novelty, the activity and stability of the best photocatalyst were evaluated in a continuous flow reaction system, upgrading conventional short-cycle batch studies. The heterostructure maintained an almost constant high conversion of acetaminophen during the 10 h on stream of the experiment, demonstrating excellent photocatalytic performance and stability in water. Besides, the photocatalytic degradation intermediates were identified, and a corresponding pathway of ACE transformation was proposed |
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