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dc.contributor.advisorRodríguez, Jorge Enrique
dc.coverage.spatialColombiaspa
dc.creatorRodríguez Páez, Mauricio
dc.date.accessioned2020-03-24T15:57:37Z
dc.date.available2020-03-24T15:57:37Z
dc.date.created2018
dc.identifier.urihttp://hdl.handle.net/20.500.12010/8239
dc.description.abstractAunque aún no hay un criterio unificado sobre el carácter tóxico del glifosato y dado el interés que existe en su remoción de las fuentes hídricas, en este trabajo se utilizó la natotecnología con este objetivo. Para ello se sintetizaron de manera controlada nanopartículas de óxido de cinc (ZnO-NPs) usando una ruta química. Los polvos de ZnO obtenidos se caracterizaron utilizando las espectroscopías infrarroja y absorción UV-Vis, Difracción de Rayos X y Microscopia Electrónica de Barrido. Para evaluar la capacidad de remoción, se conformaron soluciones acuosas del producto Roundup 747 SG de la casa comercial Monsanto de 679 gr/Kg de Glifosato, para obtener suspensiones glifosato – ZnO-NPs de: 250 ppm - 250 ppm, 700 ppm - 700 ppm, 1000 ppm - 1000 ppm ZnO, 1000 ppm - 250 ppm y 1000 ppm - 700 ppm que se utilizaron para realizar los ensayos. Las curvas de % de Remoción obtenidas indican que las ZnO-NPs removieron entre un 70 y 90% del herbicida del sistema, dependiendo de la relación de concentraciones. Aunque los espectros de absorción UV-Vis mostraron pequeños desplazamientos del máximo de absorción y la aparición de otras pequeñas bandas, dando indicios de degradación del herbicida, fue la adsorción el mecanismo más importante de remoción. La cinética de este proceso fue descrita adecuadamente por una ecuación pseudo de segundo orden aunque no se puede despreciar, para algunas relaciones de concentración glifosato – ZnO-NPs, la importancia de la difusión intrapartícula. Estos resultados indican que las nanopartículas de ZnO sintetizadas fueron eficientes para remover glifosato en soluciones acuosas a nivel de laboratorio.spa
dc.format.extent34 páginasspa
dc.format.mimetypeapplication/pdfspa
dc.publisherUniversidad de Bogotá Jorge Tadeo Lozanospa
dc.subjectRoundupspa
dc.subjectAdsorción; ZnO-NPsspa
dc.subjectSíntesisspa
dc.titleUso de Nanoparticulas de ZnO (ZnO NPs) en la Remoción del Herbicida Glifosatospa
dc.type.localTrabajo de grado de maestríaspa
dc.subject.lembCiencias medioambientales -- Trabajos de gradospa
dc.subject.lembNanopartículasspa
dc.subject.lembPlaguicidasspa
dc.subject.lembFungicidasspa
dc.rights.accessrightsinfo:eu-repo/semantics/openAccessspa
dc.type.hasversioninfo:eu-repo/semantics/acceptedVersioneng
dc.rights.localAbierto (Texto Completo)spa
dc.subject.keywordZnO-NPsspa
dc.identifier.repourlhttp://expeditio.utadeo.edu.coeng
dc.publisher.programMaestría en ciencias ambientalesspa
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dc.format.rda1 recurso en línea (archivo de texto)spa
dc.description.rdaRequerimientos de sistema: Adobe Acrobat Readerspa
dc.description.abstractenglishAlthough there is still no unified criterion on the toxicity of glyphosate and given the interest that exists in its removal from water sources, in this work, natotechnology was used for this purpose. For this, zinc oxide nanoparticles (ZnO-NPs) were synthesized in a controlled and reproducible manner. The ZnO powders obtained were characterized using infrared and UV-Vis absorption spectroscopy, X-ray diffraction and Scanning Electron Microscopy. To evaluate the removal capacity of organic molecules by ZnO-NPs, aqueous solutions of the product Roundup 747 SG of the Monsanto commercial house of 679 gr / Kg of glyphosate were formed to obtained glyphosate-ZnO-NPs suspensions of: 250 ppm - 250 ppm, 700 ppm - 700 ppm, 1000 ppm - 1000 ppm ZnO, 1000 ppm - 250 ppm and 1000 ppm - 700 ppm. The % Removal curves indicate that the ZnO nanoparticles removed between 70 and 90% of the system's herbicide, depending on the concentration ratio. Although the UV-Vis absorption spectra showed small displacements of the absorption maximum and the appearance of other small absorption bands giving indications of herbicide degradation, adsorption was the most important mechanism of removal. Mainly this process presented a pseudo-second order kinetic although it can not be disregarded, for some glyphosate - ZnO-NPs concentrations, the importance of intraparticle diffusion. These results show that the ZnO nanoparticles synthesized were efficient to remove glyphosate in aqueous solutions at the laboratory level.spa
dc.description.degreenameMagister en Ciencias Ambientalesspa
dc.publisher.facultyFacultad de Ciencias Naturales e Ingenieríaspa
dc.identifier.instnameinstname:Universidad de Bogotá Jorge Tadeo Lozanospa
dc.identifier.reponamereponame:Repositorio Institucional de la Universidad de Bogotá Jorge Tadeo Lozanospa
dc.type.driverinfo:eu-repo/semantics/masterThesisspa


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