Efecto de la temperatura, presión y potencia en la obtención de TiO2 y TiO2-Fe vía microondas y evaluación de la actividad fotocatalítica con el tiempo de síntesis
Publicado 2019-04-08
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Resumen
Fotocatalizadores de dióxido de titanio (TiO2) dopados a diferentes porcentajes de hierro fueron sintetizados vía microondas a 180 °C a dos tiempos: 2 min y 10 min de síntesis, en los cuales se analizó el cambio de temperatura, presión y potencia. Se observaron variaciones importantes, principalmente en las condiciones de presión. Los fotocatalizadores sintetizados fueron caracterizados usando: Microscopía electrónica de barrido, difracción de rayos X, área superficial específica y espectroscopía UV-vis de reflectancia difusa. Se observó la presencia de nanopartículas; además, la fase anatasa cristalina de TiO2 fue la única encontrada. Se realizó un estudio de la actividad fotocatalítica para la decoloración del colorante azul ácido 9 con luz UV, la cual se comparó con el fotocatalizador comercial Degussa P-25, teniendo como mejor resultado una decoloración total del colorante a 45 min de reacción con el fotocatalizador de TiO2 sin dopar sintetizado a 2 min de reacción. El dopaje con hierro no presentó una mejor actividad fotocatalítica; además, se observó que el tiempo de síntesis influye considerablemente en la actividad fotocatalítica, teniendo mejores eficiencias en el menor tiempo.
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