Estudo comparativo de (nano)catalisadores de TiO2 para fotodegradação heterogênea do corante azul indigotina

Abstract

Advanced oxidative processes has advantage of over other advanced effluent treatments is the mineralization of the most refractory pollutants, making them biodegradable. Semiconductor catalysts can be used for greater degradation efficiency in short periods of time. Titanium dioxide (TiO2) is the most extensively studied catalyst mainly due to its non-toxicity, photostability and chemical stability over a wide pH range. The objective of this work was to carry out the evaluation of the degradation process of the highly refractory food coloring Indigotin Blue, to offer possible solutions to industries in which it is used regarding the proper disposal of effluents, reducing the environmental impact. To catalyze the photodegradation reaction, solutions were studied under the following conditions: without catalyst, with addition of common TiO2 and with addition of TiO2 nanotube at different times. The optimal condition for the photodegradation of the dye under study was with the addition of the TiO2 nanotube catalyst for a period of 60 minutes, as the nanotube catalyst has more catalytic adsorption sites, making it an excellent choice for photocatalysis processes.