Facultad Ciencias

Permanent URI for this community

https://repositorio.uptc.edu.co/handle/001/1

News

Browse

Browsing Facultad Ciencias by Subject "Alteración hidrotermal"

Now showing 1 - 1 of 1
  • Thumbnail Image
    Item
    Estudio del efecto de los parámetros de síntesis sobre las propiedades físicoquímicas y fotocatalíticas de sistemas Pt-F-TiO2
    (Universidad Pedagógica y Tecnológica de Colombia, 2018) Cely Macias, Angela Carolina; Murcia Mesa, Julie Joseane; Rojas Sarmiento, Hugo Alfonso
    Currently, Titanium dioxide (TiO2) is one of the most used materials in different fields, such as: materials engineering, environment and electronics. This material has attracted the attention of hundreds of chemists, physicists, and engineers who have explored the properties of this oxide as a semiconductor and catalyst, it has been applied in pigments, as support in catalysis, photoconductors, dielectric materials, paints, and personal care products, among others. Titanium dioxide is the most commonly used semiconductor in photocatalytic processes and different strategies have been employed to improve the physicochemical properties and photo efficiency of this oxide; within these strategies are different methods of synthesis and surface modification treatments; from these treatments it is possible to modify the crystal size, particle size, surface area, amount of hydroxyl groups and band-gap. From these properties it is possible to obtain TiO2 with high efficiency in the degradation of toxic organic compounds and in the elimination of microbial species present in different contaminated environments. The main objective of this research was focused on the study of the effect of the synthesis parameters on the physicochemical properties of the obtained materials. Initially, the obtention of TiO2 was evaluated by two methods: Hydrothermal and Sol-gel, commercial TiO2 was also used as a reference material. In addition, and in order to improve their photocatalytic properties, these oxides were modified by fluorization treatment and subsequent addition of platinum nanoparticles. In order to obtain information about the physical and chemical properties, a complete characterization of the materials obtained was carried out; different techniques were employed to achieve this objetive: X-ray diffraction (XRD), N2 adsorption-desorption (SBET), X-ray fluorescence spectrometry (XRF), Spectrophotometry UV-Vis diffuse reflectance (UV-Vis DRS), Transmission Electron Microscopy (TEM), X-ray photoelectron spectroscopy (XPS) and Fourier Transform Infrared Spectroscopy (FT-IR). The thesis of Master in Chemistry was developed in the Grupo de Catálisis de la Universidad Pedagógica y Tecnológica de Colombia and to advance some of the physicochemical analysis involved in the experimental work, it was supported by different institutions such as the Instituto para la Investigación e Innovación en Ciencia y Tecnología de los Materiales (INCITEMA), Universidad Industrial de Santender (UIS), Instituto de Ciencia de Materiales de Sevilla (ICMS). All of the above derive in the obtaining of a very complete research work and of great contribution in the subject of Heterogeneous Photocatalysis applied in the treatment of industrial wastewater. This work was financed by the Universidad Pedagógica y Tecnológica de Colombia and Fondo Nacional de Financiamiento para la Ciencia, la Tecnología y la Innovación, Fondo Francisco José de Caldas (COLCIENCIAS), this institution funded the author's studies of the Master's Degree of the present work. The thesis document is divided into 4 main sections, the first of which corresponds to the conceptual and theoretical component within which the work was framed, a second section includes the description of the experimental development, the results and analyzes obtained from the characterization of photocatalytic materials and finally the results of the effectiveness of these materials in the treatment of commercial anilines and industrial effluents derived from the handicraft industry in the town of Nobsa, department of Boyacá. In general, the characterization made it possible to observe that the modifications made to titanium dioxide alter its physicochemical properties and give new properties to this oxide, which allows it to be more active in environmental decontamination processes. Regarding the effectiveness of the photocatalytic materials synthesized, it was observed that the fluorinated catalysts favor the formation of the Anatase crystalline phase, allowing a greater degradation of the commercial anilines and a high rate of elimination of pathogenic microorganisms present in the wastewater analyzed. It was also observed that the addition of Pt in the photocatalytic materials represents for many authors a positive strategy in the improvement of the effectiveness; in the present investigation it was possible to determine that the homogeneous dispersion of the particles is related to the surface area and the Anatase phase; Regarding the effectiveness of the photocatalytic materials synthesized, it was generally observed that in the fluorinated photocatalysts the formation of the Anatase crystalline phase is favored, allowing a greater degradation of the commercial anilines and a high rate of elimination of pathogenic microorganisms present in the wastewater analyzed. This represents an important contribution in the search for solutions to the environmental problems currently facing the department and will be an interesting alternative that encourages applied research and encourages the University - Government - Company - Community. Resulting in active materials in the visible region. These results will be discussed in detail throughout this document.