Elaboración y caracterización de membranas de nanotubos de dióxido de titanio para ultrafiltración

dc.contributorZea Ramírez, Hugo Ricardo
dc.contributorArias Monje, Pedro José
dc.contributorGrupo de Investigación en Materiales, Catálisis y Medio Ambiente
dc.creatorGarcía Vargas, Andrés Leonardo
dc.date.accessioned2021-10-19T17:47:59Z
dc.date.accessioned2023-06-06T23:17:04Z
dc.date.available2021-10-19T17:47:59Z
dc.date.available2023-06-06T23:17:04Z
dc.date.created2021-10-19T17:47:59Z
dc.date.issued2021
dc.identifierhttps://repositorio.unal.edu.co/handle/unal/80577
dc.identifierUniversidad Nacional de Colombia
dc.identifierRepositorio Institucional Universidad Nacional de Colombia
dc.identifierhttps://repositorio.unal.edu.co/
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/6651200
dc.description.abstractSistemas de ultrafiltración emplean membranas con poros de 20 – 200 nm. En este trabajo se estudia la producción de membranas de nanotubos de dióxido de titanio y su uso en ultrafiltración. Nanotubos de dióxido de titanio fueron obtenidos por anodización potenciostática de láminas de titanio en etilenglicol con fluoruro de amonio y agua. Se analizaron los efectos del contenido de fluoruro de amonio, voltaje y separación de los electrodos sobre las dimensiones de los nanotubos. Se evidenció que una preanodización mejora el grado de ordenamiento de los nanotubos. Adicionalmente, se encontró correlación entre la presencia de defectos en el arreglo de nanotubos y la relación fluoruro de amonio / agua. Para separar la capa de nanotubos del soporte metálico y así obtener una membrana se evaluaron tres métodos: separación mecánica, disolución con peróxido de hidrógeno y paso de alto voltaje. Empleando el método de paso de alto voltaje, pasando de 60 V a 150 V al final de la anodización, se obtiene una membrana de nanotubos de dióxido de titanio con 68% de poros abiertos, diámetro promedio de poro de 121 nm, 25 µm de espesor, tortuosidad de 1 y superficie hidrofílica; características adecuadas para una membrana de ultrafiltración. Sin embargo, esta membrana se quiebra a presiones superiores a 2448 Pa, indicando que se requiere evaluar un refuerzo mecánico. Se diseñó un soporte para realizar ensayos de difusión a través de la membrana, y se comprobó que esta permite el paso de partículas acorde a su tamaño de poro. (Texto tomado de la fuente).
dc.description.abstractUltrafiltration systems use membranes with pores of 20-200 nm. In this work, the production of titanium dioxide nanotube membranes and their use in ultrafiltration are studied. Titanium dioxide nanotubes were obtained by potentiostatic anodization of titanium foil in ethylene glycol, ammonium fluoride and water mixtures. The effects of ammonium fluoride content, voltage and electrode spacing on the dimensions of the nanotubes were analyzed. It was evidenced that a pre-anodization improves the degree of ordering of the nanotubes. Additionally, a correlation between the presence of defects in the nanotube array and the ammonium fluoride / water ratio was found. To obtain a membrane by separating the nanotube layer from the metallic substrate, three methodologies were evaluated: mechanical separation, dissolution with hydrogen peroxide and high-voltage step. Using the high-voltage step method, going from 60 V to 150 V at the end of the anodization, a titanium dioxide nanotube membrane is obtained with 68% open pores, average pore diameter of 121 nm, 25 µm thick, tortuosity of 1 and hydrophilic surface; suitable characteristics for an ultrafiltration membrane. However, this membrane breaks at pressures higher than 2448 Pa, indicating that it is necessary to evaluate a mechanical reinforcement. A support was designed to carry out diffusion tests through the membrane, and it was found that the membrane let the particles permeate according to its pore size.
dc.languagespa
dc.publisherUniversidad Nacional de Colombia
dc.publisherBogotá - Ingeniería - Maestría en Ingeniería - Ingeniería Química
dc.publisherDepartamento de Ingeniería Química y Ambiental
dc.publisherFacultad de Ingeniería
dc.publisherBogotá, Colombia
dc.publisherUniversidad Nacional de Colombia - Sede Bogotá
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dc.rightshttp://creativecommons.org/licenses/by-nc/4.0/
dc.rightsinfo:eu-repo/semantics/openAccess
dc.titleElaboración y caracterización de membranas de nanotubos de dióxido de titanio para ultrafiltración
dc.typeTrabajo de grado - Maestría


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