Imobilização de TiO2 em carvão ativado aplicado em processos de fotocatálise heterogênea visando a remoção de cor de uma solução de corante reativo

Abstract

The generation of waste occurs throughout the textile production process, generating solid, gaseous and liquid waste. Waste is a major problem for the textile industry, being considered a major water polluter, as a high volume of effluent is generated in the finishing processes (processing, dyeing and printing). To mitigate the consequent problems caused by the generation of textile effluents during the production process, several technologies are being studied, one of them is the Advanced Oxidation Process (POAs). Another widely used method for treating effluents is adsorption from activated carbon. With that, the general objective of this work was to perform the combination of the processes of treatment of effluent by heterogeneous photocatalysis with activated carbon, incorporate the catalyst in the activated carbon and then improve the photocatalytic process in the solid-liquid separation stage. The study revealed that it is possible to activate activated carbon from the filter powder, as well as to immobilize TiO2 on the coal. For its use in a heterogeneous photocatalysis process to remove color, the best results were obtained at pH 5, with the charcoal produced in a muffle and with the previous mixture of the catalyst. The possibility of reusing coal was also identified, but the concentration must be adjusted since its efficiency had a decrease in color removal. The decantation time of the coal, in comparison with the suspended catalyst, was shorter, however one should try to manufacture the coal in granules and not in powder, which would further improve the decantation time and avoid fine particles in suspension.