Degradación fotocatalítica del herbicida ácido 2,4-diclorofenoxiacético empleando materiales de iridio soportado

Photocatalytic degradation of the 2,4-dichlorophenoxyacetic acid herbicide using supported iridium materials

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Claudia Patricia Castañeda Martínez
Ignacio Alfonso Alvarado Ortega
Hugo Alfonso Rojas Sarmiento
Francisco Javier Tzompantzi Morales
José Ricardo Gómez Romero

Resumen

En este trabajo se evaluó el efecto de la adición de iridio sobre soportes de TiO2 y Nb2O5 obtenidos por el método de impregnación húmeda en la degradación fotocatalítica del ácido 2,4-diclorofenoxiacético bajo irradiación UV. Los materiales sintetizados fueron analizados mediante diferentes técnicas para determinar sus propiedades fisicoquímicas. En general, se observó que la adición de iridio modifica el área superficial, la energía de banda prohibida y mejora la cristalinidad de los materiales. Además, se evidenció un aumento de la fotoactividad en la degradación del herbicida utilizando los materiales modificados. Sin embargo, el fotocatalizador Ir/TiO2 presentó el mejor comportamiento fotocatalítico hacia la degradación y posible mineralización del herbicida. El rendimiento mejorado del fotocatalizador podría argumentarse por el papel de las partículas de iridio como colectores de electrones que favorecen la separación efectiva de los portadores de carga y, como consecuencia, aumenta la degradación de la molécula.

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