Dióxido de titanio mesoporoso modificado, como fotocatalizador activo bajo luz visible en la remoción de ibuprofeno de matrices acuosas
Date
2021
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Abstract
Se sintetizaron nanopartículas de dióxido de titanio mesoporosas autodopadas con
carbono empleando un método de síntesis amigable con el medio. Los materiales fueron
caracterizados con distintas técnicas, entre ellas estudios de profundidad de los sólidos
mediante XPS. Éstos, permitieron dilucidar avances sobre la naturaleza de las especies de
carbono responsables de la fotosensibilidad de los materiales, pudiendo distinguir entre el
carbono superficial y el carbono que forma parte de la matriz de titania. Se estudió el efecto
de la calcinación en términos de la respuesta de los sólidos a luz visible LED, para degradar
ibuprofeno (IBU) en soluciones acuosas. La mayor degradación se alcanzó empleando el
fotocatalizador autodopado con carbono y tratado a 200 °C. Se propuso que la generación
de nuevos estados electrónicos, responsables de reducir la banda prohibida del TiO2,
debido a la presencia de carbono en distintos sitios en la red, es la responsable de este
comportamiento.
Self-doped carbon mesoporous titanium dioxide nanoparticles were synthesized using an environment-friendly synthesis method. The materials were characterized with different techniques, including solid depth studies using XPS. These made it possible to elucidate advances on the nature of the carbon species responsible for the photosensitivity of materials, being able to distinguish between the surface carbon and the carbon that is part of the titania matrix. The effect of calcination was studied in terms of the response of solids to LED visible light, to degrade ibuprofen (IBU) in aqueous solutions. The highest degradation was achieved using the photocatalyst carbon self-doped and treated at 200 °C. It was proposed that the generation of new electronic states, responsible for reducing the forbidden band of TiO2, due to the presence of carbon in different sites in the network, is responsible for this behavior.
Self-doped carbon mesoporous titanium dioxide nanoparticles were synthesized using an environment-friendly synthesis method. The materials were characterized with different techniques, including solid depth studies using XPS. These made it possible to elucidate advances on the nature of the carbon species responsible for the photosensitivity of materials, being able to distinguish between the surface carbon and the carbon that is part of the titania matrix. The effect of calcination was studied in terms of the response of solids to LED visible light, to degrade ibuprofen (IBU) in aqueous solutions. The highest degradation was achieved using the photocatalyst carbon self-doped and treated at 200 °C. It was proposed that the generation of new electronic states, responsible for reducing the forbidden band of TiO2, due to the presence of carbon in different sites in the network, is responsible for this behavior.
Description
Keywords
Titania mesoporosa, Autodopado, Radiación visible, LED, Remediación ambiental
Citation
5° Congreso Argentino de Ingeniería (2021). 3°Congreso Latinoamericano de Ingeniería (2021). 11vo Congreso de Enseñanza de Ingeniería (2021).
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