Membranas electrohiladas de PMMA/ZnO para mejorar la degradación fotocatalítica de azul de metileno utilizando irradiación solar
DOI:
https://doi.org/10.18633/biotecnia.v27.2587Palabras clave:
electrohilado con tratamiento térmico, poli(metil metacrilato), oxido de zinc, descomposición de colorantes, luz solarResumen
Microfibras electrohiladas de PMMA fueron combinadas con ZnO para aumentar la degradación de moléculas de colorantes. La descomposición de azul de metileno (AM) presente en soluciones acuosas bajo irradiación solar fue estudiado con espectroscopía de absorción de UV-Vis y fotoluminiscencia. Las membranas fibrosas de PMMA fueron embebidas con partículas de ZnO utilizando un tratamiento térmico a bajas temperaturas proveyendo mejor manejabilidad y cambios morfológicos. El diámetro promedio de las fibras varía entre 1,5 ± 0,26 a 2.5 ± 0,36 µm, influenciado por el tratamiento térmico y la adición de ZnO.
El análisis de EDS indicó la presencia y distribución homogénea de Zn y O sobre las fibras de PMMA, también por FTIR, XRD y análisis de TGA se corrobora la presencia y composición de ZnO. La dispersion de ZnO en la matriz polimérica influye en la rugosidad y ángulo de contacto, características importantes en la degradación de colorantes. La decoloración de la molécula del colorante con fibras de PMMA/ZnO fue mejor en la irradiación solar (96% de degradación del AM) comparada con las condiciones en oscuro (< 2% de degradación de AM). La nueva estrategia de síntesis del material para la actividad fotocatalítica es adecuada para el tratamiento de efluentes de aguas residuales.
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