Degradación oxidativa de moléculas modelo de efluentes de la industria textil utilizando cobaltita nanométrica como fotocatalizador
Polo Jaramillo, Daniel Darío
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AbstractIn the present work, cobalt was evaluated as a photocatalyst in advanced oxidation processes, which are defined as processes that increase the generation of hydroxyl radicals (OH °) applied to the removal of organic contaminants present in the water. For this purpose, considered pollutants of the textile industry, among which are Rhodamine B, Tartrazine, Malachite Green and methylene blue. Photocatalysis was studied as part of the advanced oxidation processes to remove these pollutants mentioned above, in which photocatalytic material titanium dioxide (TiO2) and hydrogen peroxide (H2O2) were used. The cobaltites were prepared from barium nitrate, cobalt acetate and lanthanum oxide, using EDTA and Glycine as complexing agents. Thus, two different cobalttes, Cobaltite Lantane-EDTA and Cobaltite Lantane-Glycine were obtained. After the mixing process, the mixture was subjected to a heat treatment at elevated temperatures in order to melt the material, remove the organic matter and additionally modify the crystalline structure of the material. The characterization of the material is made up of advanced analyzes such as X-ray diffraction and BET analysis, where results of its surface area, porosity, structural properties and verification of the crystalline part are obtained. To evaluate the optical properties of the diffuse reflectance infrared spectroscopy technique. An experimental design corresponding to 26 trials was established, varying the photocatalysts and colorants. In the degradation process tests were carried out under natural sunlight and ultraviolet light generated from lamps. By setting the photocatalyst concentration to 100 mg / L, the dye concentration at 20 mg / L, the maximum monitoring time was 24 hours and the pH of the system remained neutral. In order to evaluate TiO2 and H2O2, the experimental conditions were 50 mg / L and 100 mg / L for TiO2 and 4 ml / L for H2O2. The results obtained for the reference photocatalysts are within the expected ranges, for H2O2 it was close to 50% for each dye and for TiO2 it was in a range between 65% and 95% of removal. Evaluating the cobalt as a photocatalyst, it was possible to show the potential of this material to perform this process, where removal percentages were obtained close to 50%, in some cases.