Clareamento de jeans utilizando os princípios da fotocatálise heterogênea com TiO2

Abstract

The growing acceptance of jeans in the textile market brought differentiation and characteristics to the garments, with the intention of meeting consumer desires. From these aggregate characteristics, it became increasingly necessary to use chemical products to obtain certain characteristics in the laundry step. However, in order to obtain diversification to the jeans, effluents are generated that are difficult to treat, such as, for example, residual water with color change from the dye that was present in the pieces. Physicochemical treatments for wastewater were developed, referred to as advanced oxidative processes (POA), which consist of the generation of highly reactive radicals, with the ability to degrade several pollutants. The purpose of this work was to evaluate the discoloration capacity of jeans using heterogeneous photocatalysis with titanium dioxide (TiO2), to perform the lightening of the jeans, without the generation of colored and potentially toxic effluent, making the process sustainable. The study resulted in the best results for the maximum values of the parameters pH, time and concentration of catalyst, being the same: pH> 9.0 and catalyst concentration> 1.0 g / L, from tests 4 and 8. In respective results, the value obtained for color difference of the samples was 6.54 and 5.95, the best of which occurred in the shortest time. The residual bath of these samples did not show any color visible to the naked eye, having an effluent equivalent to the color of crystalline water in comparison.