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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- Sertraline degradation by electrochemical oxidation process using a low- cost electrochemical cell(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2024-06-13) Le Duc, Julieta Nicole; Lopez Zavala, Miguel Ángel; emimmayorquin; Túrren Cruz, Thalía; Borja Maldonado, Fátima Jessica Milagros; Monárrez Cordero, Blanca Elizabeth; Escuela de Ingeniería y Ciencias; Campus MonterreySertraline (SRT) has been found in different concentrations in surface and wastewater systems worldwide, for its toxic and adverse environmental impacts, different methods need to be investigated to remove it from water bodies. A highly efficient and cost-effective approach for eliminating emerging contaminants is Electrochemical Advanced Oxidation Processes (EAOPs), these processes have proven to be effective in degrading organic pollutants (as SRT), converting them into simple compounds such as carbon dioxide and water for its stabilization. This method boasts high current efficiency and can be implemented on-site with minimal requirements to be carried out as stainless-steel electrodes and an electrical power supply. Additionally, the required electrical energy can be generated from renewable sources such as solar or wind power. Degradation of SRT in surface water (SW) was conducted with a stainless-steel electrodes cell in four different pH of 3, 5, 7 and 9, with direct current densities (CD) of 9.0 mA/cm² (6V), 17.9 mA/cm² (12V) and 36.0 mA/cm (24V). For all current densities applied, SRT degradation was observed by high-performance liquid chromatography with diode-array detection (HPLC-DAD) at 220 nm. Faster degradation was observed at the higher current density with the lowest pH. In comparison with the other pH and current densities, above 99% of SRT was oxidized in 30 seconds at 36.0 mA/cm² at pH3, while in the lowest current density and highest pH the degradation had a reaction time above 30 minutes. There were not oxidation products observed by HPLC at 220 nm. For all current densities the faster degradation process occurred in pH 3. Results found in this research show a practical and low-cost application for remotion of SRT since its investment cost goes to $13.42 US dollars per liter treatment and energy consumption does not surpass 100 kWh, that can be potentially supplied by renewable energies.
- Lab-scale modular platform to study coiled-flow inverters (CFI) as candidates for continuous-flow photoreactor units: A case study based on the oxidative degradation of fluorescein induced by visible light in the presence of ZnO-APTMS-Au micro/nano-particles in aqueous suspension(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2020-12-04) Tiwari, Chinmay Pramodkumar; Aguirre Soto, Héctor Alán; tolmquevedo; Gallo Villanueva, Roberto Carlos; Contreras Cruz, David Atahualpa; López Guajardo, Enrique Alfonso; School of Engineering and Sciences; Campus MonterreyVisible light-driven continuous-flow photochemistry has gained widespread recognition lately and is employed in many innovatively designed photoreactors. Out of the two main categories, slurry reactors are found to have a better reputation in terms of achieving competitive photon efficiencies when compared to immobilized catalyst type reactor designs. However, several obstacles had stalled the broad-scale implementation of this beneficial process. A few of the main imminent challenges include combating light attenuation by better mixing in continuous-flow of the suspension to allow the use of the higher photocatalyst content and require lower photon consumption. Also, the difficulties in the fabrication of intricate glass-based photoreactor designs are one of the significant challenges. An inherently better-designed reactor which deals with the common problems of conventional photoreactors is required. This thesis presents a flexible platform to study photoreactors, where a coiled flow inverter—a well-established static mixer design— is used as a micro/milli-fluidic device. The CFI is incorporated as a photoreactor for the first time for a continuous flow photodegradation study of an organic model pollutant, fluorescein, with ZnO catalyst functionalized with APTMS and Au nanoparticles to make it visible-light absorptive. Flow inversions leading to chaotic advection occurring in the CFI combats light attenuation. Due to superlative mixing coupled with a highly efficient visible light source, our photo-CFI stands to be in top slurry reactor designs as per the recently established PSTY benchmark, valued at 2.97×10^−2 (m^3 treated water day^-1 m^-3 reactor kW^-1). A brief study on the uni- and multi-axial light arrangement for complex geometries was used to analyze the effect of geometry/lighting arrangement and ensure uniform irradiation of the photo-CFI. A discussion of dye-degradation products surface interaction with photocatalyst was carried out to analyze possible explanations for an observed destabilization of the suspension during reaction, leading to depositions in the reactor. SLA based additive manufacturing is tested and projected to be a superior alternative for rapid prototyping of intricate transparent photoreactor designs in lieu of conventional glass blowing techniques of complex geometries such as those required for static mixers like the photo-CFI.