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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- Use of modified biopolymer for the removal of emerging contaminants in wáter(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2024-11-15) Ramírez Miguel, Alvaro Cuauhtemoc; Almanza Arjona, Yara Cecilia; emipsanchez; Murillo Hernández, José Alberto; School of Engineering and Sciences; Campus Ciudad de México; Sánchez Rodríguez, Elvia PatriciaThis thesis explores the development and application of modified biopolymers for sustainable water treatment, focusing on improving the removal of contaminants while aligning with principles of green chemistry. The research aims to develop a novel material to mitigate the environmental effect of conventional water treatment processes by introducing a more environmentally friendly alternative. The chemical modification of Microcrystalline Cellulose (MCC) involves grafting the biopolymer with Diallyldimethylammonium Chloride (DADMAC) using Ceric Ammonium Nitrate (CAN) as an initiator and microwave irradiation to enhance its coagulation and adsorption capabilities. Characterization techniques, including Fourier-Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), Differential Scanning Calorimetry (DSC), and ThermoGravimetric Analysis (TGA) confirmed the successful grafting and provided insights into the material’s structural and chemical properties. Performance evaluations demonstrated improved removal of the emerging pollutants paracetamol and Red 40 dye, highlighting the potential of MCC-DADMAC as a novel approach in water treatment applications. This research contributes to the ongoing efforts to develop eco-friendly alternatives in water purification, leveraging biopolymers from agro-industrial waste and advancing the field towards more sustainable practices.
- Cellulose-based aerogel from wastepaper by lyophilization for the removal of oil in polluted water bodies(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2022-12) Valencia Bermúdez, José Luis; Elías Espinosa, Milton Carlos; puelquio, emipsanchez; Del Prado Audelo, María Luisa; Escuela de Ingeniería y Ciencias; Campus Ciudad de México; Rosas Meléndez, Samuel AntonioThe present work was performed with the purpose of developing a cellulose-based aerogel with hydrophobic properties to be used as an absorbent for the removal of oil pollutants in water. The produced aerogel was obtained from waste office paper cellulose via lyophilization and used biodegradable materials to gain hydrophobicity. The physical properties of the obtained aerogels showed a high porosity value, above 90% and low densities, less than 0.15 g/cm3. These properties are essential for absorbents as they allow pollutants to permeate through their bodies filling their internal porous network. To prove the usefulness of the synthesized cellulose-based aerogels, an oil absorption capacity test was performed, the results indicate that the produced aerogels could absorb 7 times their original weight. For hydrophobicity, two types of surface modifications were performed. The first one was done with polycaprolactone achieving a water contact angle of 129°, while the second modification used candelilla wax, obtaining a contact angle of 123°, both achieved hydrophobicity by surpassing an angle of 90°. The scanning electron microscopy images provided proof of the surface modifications, while the Fourier-transform infrared spectroscopy, thermogravimetric analysis and differential scanning calorimetry experiments further demonstrated the presence of both materials in the tested samples. Lastly, the reusability of the produced aerogels was tested, the candelilla wax coating degraded after the first cycle, while the PCL coating managed to keep its hydrophobic properties and most of its absorbent capacity after 5 adsorption–desorption cycles. These results show that a cellulose-based aerogel is able to function as an oil absorbent with potential practical applications.