TiO2 suportado em material cerâmico para descoloração de efluente com auxílio de UV/O3.

Abstract

The objective of this work was the improvement of techniques and development of methods for the purification of waste water with dyes, where, for example, for dyeing of gemstones, organic dyes highly harmful to the environment are used due to their toxicity and their great capacity of Dyeing, the widely used dye is Rhodamine-B which gives the pink shade. As a form of degradation of organic compounds and dyes, treatment techniques were used through Advanced Oxidative Processes (POA's), for that a porous ceramic support was developed that received the photocatalyst and TiO2. The photocatalysis system was composed of two reactors, one horizontal with a UVV lamp with 185 nm of wavelength and a vertical reactor that used a UVC lamp with 254 nm of wavelength. Due to the fact that the Rhodamine-B dye is toxic, requiring greater care in the handling and experiments, the use of the Methylene Blue dye was chosen. The analyzes were performed in 60 min duration with aliquot removal every 10 min, and the values analyzed in spectrophotometer. In order to determine the best configuration for the degradation of the dye, the analyzes were divided in two stages, the first one was the application of the UV and O3 lamps in several configurations aiming at the best result, where a value of approximately 45% was obtained in the degradation of the Dye with the combination UVC / O3, from this configuration the TiO2 was applied. As O3 is highly oxidizing, it was chosen for the analysis with TiO2 not to use it, in order to be able to analyze specifically the photocatalytic activity of TiO2, with that reached a degradation percentage value of approximately 70%. It was observed that ceramic samples impregnated with TiO2 when reused lost their degradability, due to the adsorption of the solution in the photocatalyst, to regenerate the degradation capacity, the samples were cleaned, immersed in deionized water and kept on O3 injection for 3 hours, regenerating its degradation capacity.