Ciencias Exactas y Ciencias de la Salud
Permanent URI for this collectionhttps://hdl.handle.net/11285/551039
Pertenecen a esta colección Tesis y Trabajos de grado de las Maestrías correspondientes a las Escuelas de Ingeniería y Ciencias así como a Medicina y Ciencias de la Salud.
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- Photocatalytic activity of chemically deposited ZnO and TiO₂ nanostructured thin films in methyl orange degradation(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2025-06-09) Lara Garcilazo, Israel Iván; Karthik Tangirala, Venkata Krishna; emipsanchez; Hernández Zanabria, Angélica Guadalupe; Cano Quiroz, Anaid; Arvizu Coyotzi, Miguel Ángel; School of Engineering and Sciences; Campus Estado de México; Maldonado Álvarez, ArturoWater pollution caused by synthetic dyes, such as Methyl Orange (MO), represents an environmental concern due to their negative impacts on the environment and human health. The removal of these pollutants represents a challenge due to their chemical stability and resistance to conventional water treatment methods. Addressing these problems requires the development of photocatalytic materials capable of degrading this persistent pollutant. This project tests the photocatalytic activity of ZnO and TiO2 films by degrading MO solution (additionally, ZnO is used for the photodegradation of Levonorgestrel). ZnO thin films were deposited using Dip Coating and Ultrasonic Spray Pyrolysis to study the effect of precursor concentration, Ni doping, precursor milling and deposition method. Additionally, TiO2 samples were deposited only by Dip Coating to study the effects of the precursor used (titanium butoxide or titanium isopropoxide) and the water to titanium precursor ratio. The synthesized films were characterized by FTIR, XRD, SEM and UV-Vis spectroscopy. The highest MO degradation efficiency (83.75%) when using ZnO was achieved with ZnO-0.1-DC, which is attributable to its small crystallite size and particle sizes, as well as high dislocation density. Nevertheless, the ZnO thin films performed poorly during the degradation of levonorgestrel. Regarding TiO2 films, TiO2-103-BU-DC performed the best during the MO photodegradation (83.89%), which is attributable to its small crystallite size, high dislocation density and mixture phases (anatase and brookite).
- Application of nanoparticles for the mineralization of microplastics accumulated in wastewater in the context of Mexico city(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2022-12-05) Flores García, Victoria; Medina Medina, Dora Iliana; puemcuervo, emimayorquin; Sánchez Rodríguez, Elvia Patricia; School of Engineering and Sciences; Campus Ciudad de México; Cruz Martínez, HeribertoMicroplastics are anthropogenic pollutants that have acquired significant relevance in recent years due to their detection in the human body. This phenomenon is caused by the accumulation of these contaminants in the environment. Some of the health risks are immune responses such as chronic inflammation and oxidative stress, toxicity, and exposure to contaminants and pathogens. The currently applied strategies for plastic waste management do not remove efficiently the totality of microplastics. So, novel methods from the nanotechnology perspective have been evaluated. A new approach involving nanoparticles is the mineralization of microplastics. This method involves the catalysis of oxidative degradation reactions that destabilize the polymer’s structure. This research project evaluates the applicability of TiO2 nanoparticles for the mineralization of microplastics relevant to Mexico City (polyacrylonitrile, nylon 6, and poly (trimethyl terephthalate) by simulation of the monomer adsorption onto a (TiO2)10 nanocluster and the structural analysis of the modified geometries to identify possible bond cleavage sites and degradation products. From the simulation results, a chemisorption between the three monomers and the nanoclusters was identified. Additionally, the interaction between the structures aided in the activation of cleavage sites for polymer degradation.