Degradación fotocatalítica de ibuprofeno utilizando catalizador de TiO2/SiO2 preparados por el método sol-gel
DOI:
https://doi.org/10.65093/aci.v16.n1.2025.24Palabras clave:
contaminantes emergentes, nanomateriales, luz solar, procesos avanzados de oxidaciónResumen
Fue utilizado el nanomaterial TiO₂/SiO₂ como catalizador para la degradación de ibuprofeno un antiinflamatorio no esteroideo, mediante un proceso de fotocatálisis solar. El catalizador fue sintetizado por el método sol-gel y caracterizado por diferentes técnicas. El análisis de EDE confirmó una relación Ti:Si cercana a la teórica de 1:3, mientras que DRX evidenció la presencia de la fase anatasa de TiO₂ y la estructura amorfa de SiO₂. Las micrografías obtenidas por MEB mostraron la morfología superficial del catalizador, y el análisis de adsorción-desorción de N₂ reveló isotermas tipo IV, características de materiales mesoporosos. Las pruebas fotocatalíticas bajo 8 horas de irradiación solar demostraron una degradación de ibuprofeno del 80–85%. Los espectros UV-Vis evidenciaron una disminución en la absorbancia del anillo aromático a 220 nm y un incremento en la absorbancia del grupo ácido carboxílico a 280 nm durante las 4 horas de irradiación solar del primer día, evidenciando la formación de subproductos intermedios, los cuales se eliminaron al concluir el proceso fotocatalítico durante las 4 horas del segundo día. Además, la constante de velocidad aparente (k = 0.0295 min⁻¹) y la constante de adsorción (kads = 0.0797 L/mg) confirmaron la eficiencia del nanomaterial, favorecida por la fuerte interacción con el catalizador.
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