Ciencias Exactas y Ciencias de la Salud

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Development of biosensors for the detection of contaminants of emerging concern
(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2023-06) Herrera Domínguez, Marcela; HERRERA DOMINGUEZ, MARCELA; 855128; Ornelas Soto, Nancy Edith; puemcuervo, emipsanchez; Morales Luna, Gesuri; García Morales, Raúl; Pisano Chávez, Eduardo; School of Engineering and Sciences; Campus Monterrey; Aguilar Hernandez, Iris Anahi
In the present thesis work, two different biosensors are developed for use in the detection of contaminants of emerging concern in water. Specifically, the quantification of pharmacological compounds is desired since they are bioactive and have been shown to have harmful effects on aquatic organisms. The biosensors were developed using different approaches; one of them is an SPR-type optical biosensor that uses antibodies to perform the sensing, while the other is an enzyme-based electrochemical biosensor of the amperometric type. These biosensors were used for the detection of diclofenac and acetaminophen respectively, achieving detection limits that make them suitable for use in real samples. The electrochemical biosensor has the advantage of being a simpler and easier to use design; however, the optical biosensor achieved a lower detection limit due to its high sensitivity and selectivity. Both biosensors provide valuable information in the development of biosensors for environmental monitoring.
Synthesis, characterization, and application of micro- and nanomaterials for the removal of organic contaminants from groundwater and wastewater
(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2020-12-03) Orona Návar, Carolina; ORONA NAVAR, CAROLINA; 584962; Ornelas Soto, Nancy Edith; hermlugo, emipsanchez; Hernández Navarro, Netzahualpille; García García, Alejandra; García Morales, Raúl; Escuela de Ingeniería y Ciencias; Campus Monterrey; Jürgen, Mahlknecht
The increasing presence of chemicals and pharmaceuticals in the aquatic environment represents a latent threat both to ecosystems and to human health. Conventional treatment methods for water hardly eliminate these pollutants, which are usually dissolved in low concentrations (μgL-1 or ngL-1). Because of their physicochemical characteristics, the use of micro- and nanomaterials in advanced treatment processes represents a feasible alternative to eliminate this kind of persistent pollutants. In this study, different methods were applied to enhance the performance of micro- and nanomaterials for water treatment applications. Specifically, titanate nanotubes were synthesized, characterized, and successfully used for the adsorption of six organic pollutants of interest. First and second order kinetic models as well as, adsorption isotherms of Freundlich and Langmuir were investigated. Also, the photocatalytic activity of different bismuth-based materials was investigated. For instance, the photocatalytic efficiency of BiVO4 was enhanced through rare-earth doping (Gd3+) and a series of Bi2O3/rGO/MonO3n-1 all-solid-state ternary Z-scheme were synthesized as well. The synthesized photocatalysts were studied through photocatalytic degradation of selected contaminants and the photocatalytic experiments were carried out in different water matrices such as pure water, groundwater, or urban wastewater effluent. Also, different light sources were applied during photocatalytic processes to evaluate and compare the performance using conventional and LED light sources. To better understand the properties of the synthesized materials, scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron spectroscopy (XPS), and diffuse reflectance spectroscopy (DRS) among other techniques, were applied. All the synthesized materials, after being modified in their physical or chemical form, showed a better performance than the pristine materials during adsorption or photocatalysis treatments for the removal of persistent organic contaminants in the water.
Development of SERS substrates for the characterization of cellular systems and the determination of molecules of interest
(Instituto Tecnológico y de Estudios Superiores de Monterrey, 2017-12-04) Aguilar Hernández, Iris Anahí; AGUILAR HERNANDEZ, IRIS ANAHI; 443696; Ornelas Soto, Nancy Edith; García García, Alejandra; Cárdenas Chávez, Diana Linda; Rodríguez Delgado, Melissa
Raman spectroscopy is a powerful vibrational spectroscopy technique that provides useful information regarding the chemical composition of a sample. It is a label-free technique that can be successfully applied for both single analyte detection and the an

Ciencias Exactas y Ciencias de la Salud

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