Reducción de cromo (VI) de agua de la industria del cromado empleando recubrimientos TiO2/Ni obtenidos mediante oxidación electrolítica por plasma

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dc.contributor.advisorTorres Cerón, Darwin Augusto
dc.contributor.advisorRestrepo-Parra, Elisabeth
dc.contributor.authorVelasquez Tamayo, Juan Pablo
dc.contributor.cvlacVelasquez Tamayo, Juan Pablo [0000038714]spa
dc.contributor.googlescholarhttps://scholar.google.com/citations?user=Nt09opYAAAAJ&hl=enspa
dc.contributor.orcidVelasquez Tamayo, Juan Pablo [0000000273972404]spa
dc.contributor.researchgatehttps://www.researchgate.net/profile/Juan-Velasquez-Tamayospa
dc.contributor.researchgrouplaboratorio de Fisica del Plasmaspa
dc.date.accessioned2023-12-11T21:16:24Z
dc.date.available2023-12-11T21:16:24Z
dc.date.issued2023
dc.descriptiongraficas, ilustraciones, mapas, tablasspa
dc.description.abstractEn este trabajo investigativo se realizó aprovechamiento de agua residual de niquelado para la síntesis de recubrimientos de TiO2/Ni mediante Oxidación Electrolítica por Plasma (PEO), y su evaluación en la reducción fotoelectrocatalítica de Cr (VI) en agua residual de cromado. Para ello se utilizaron sustratos de titanio de dimensiones 20x20x1 mm con variaciones de ciclo útil de trabajo entre 2% y 50%. Los recubrimientos se caracterización mediante: SEM/EDS, AFM, XRD, Raman, XPS y DRS. Los resultados obtenidos por SEM indicaron la existencia de poros en la superficie de los recubrimientos y los análisis EDS revelaron la presencia de Ti, O, Ni y S, y que la cantidad de Ni aumentó a medida que se incrementó el ciclo útil de trabajo; también se encontró que la rugosidad de los recubrimientos incrementó al pasar de ~214,2 nm a ~574,5 nm, mediante AFM. Adicionalmente, los resultados de XRD y microscopia Raman mostraron la presencia de las fases de anatasa y rutilo del TiO2, y su variación en proporción al incrementar el ciclo útil de trabajo; además se encontró que para el recubrimiento a ciclo útil de 50% se formaron fases de NiTiO3 y de NiO, lo cual fue confirmado por XPS. La caracterización óptica de los recubrimientos por DRS mostró un corrimiento hacia la región visible del espectro electromagnético en respuesta a la presencia de Ni en el material sintetizado, presentando absorciones desde ~505 nm hasta ~558 nm. Finalmente, se implementaron diseños experimentales para la evaluación fotoelectrocatalítica en la reducción de Cr (VI), para los recubrimientos de 2% y 50% de ciclo útil de trabajo. Los resultados indicaron que la tensión aplicada y la concentración de Cr (VI) son las variables de mayor influencia en el proceso, y que el recubrimiento de 2% de ciclo útil presentó mejores eficiencias de reducción de Cr (VI) comparado al de 50%, debido a la presencia de mayor proporción de la fase anatasa. Además, se determinaron las condiciones óptimas del proceso, se realizó el estudio cinético ajustado a un modelo cinético de pseudo-primer orden, y se evaluaron los ciclos de uso del material, encontrando que luego de 16 ciclos de uso la eficiencia es mayor al 98% (Texto tomado de la fuente)spa
dc.description.abstractIn this research work, the use of nickel-plating wastewater was exploited for the synthesis of TiO2/Ni coatings using Plasma Electrolytic Oxidation (PEO), and their evaluation in the photoelectrocatalytic reduction of Cr (VI) in chrome-plating wastewater. Titanium substrates of dimensions 20x20x1 mm with variations in duty cycle from 2% to 50% were used for this purpose. The coatings were characterized by SEM/EDS, AFM, XRD, Raman, XPS and DRS. The SEM results indicated the presence of pores on the surface of the coatings and EDS analysis revealed the presence of Ti, O, Ni, and S, with an increase in Ni content as the duty cycle increased. The AFM results showed an increase in coating roughness from ~214.2 nm to ~574.5 nm with an increase in the duty cycle. XRD and Raman microscopy results showed the presence of anatase and rutile phases of TiO2, with a change in proportion of increasing in duty cycle. Furthermore, NiTiO3 and NiO phases were formed in the coating with 50% of the duty cycle, as confirmed by XPS. Optical characterization of the coatings performed by DRS showed a shift band towards the visible region of the electromagnetic spectrum in response to the presence of Ni in the synthesized material, with absorptions ranging from ~505 nm to ~558 nm. Finally, experimental designs were implemented to evaluate the photoelectrocatalytic reduction of Cr (VI) using the coatings with 2% and 50% of the duty cycle. The results indicated that the applied voltage and Cr (VI) concentration were the most influential variables in the process, and the 2% duty cycle coating showed better Cr (VI) reduction efficiency compared to the 50% duty cycle coating due to the higher proportion of the anatase phase. Additionally, the optimal process conditions were determined, the kinetic study was adjusted to a pseudo-first-order kinetic model, and the material's usage cycles were evaluated, finding that after 16 cycles of use, the efficiency was higher than 98%.eng
dc.description.curricularareaCiencias Naturales.Sede Manizalesspa
dc.description.degreelevelMaestríaspa
dc.description.degreenameMagíster en Ciencias - Físicaspa
dc.description.researchareaProcesos Avanzados de Oxidaciónspa
dc.format.extentxvii, 166 páginasspa
dc.format.mimetypeapplication/pdfspa
dc.identifier.instnameUniversidad Nacional de Colombiaspa
dc.identifier.reponameRepositorio Institucional Universidad Nacional de Colombiaspa
dc.identifier.repourlhttps://repositorio.unal.edu.co/spa
dc.identifier.urihttps://repositorio.unal.edu.co/handle/unal/85067
dc.language.isospaspa
dc.publisherUniversidad Nacional de Colombiaspa
dc.publisher.branchUniversidad Nacional de Colombia - Sede Manizalesspa
dc.publisher.facultyFacultad de Ciencias Exactas y Naturalesspa
dc.publisher.placeManizales, Colombiaspa
dc.publisher.programManizales - Ciencias Exactas y Naturales - Maestría en Ciencias - Físicaspa
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dc.rights.accessrightsinfo:eu-repo/semantics/openAccessspa
dc.rights.licenseAtribución-NoComercial 4.0 Internacionalspa
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/spa
dc.subject.ddc530 - Física::535 - Luz y radiación relacionadaspa
dc.subject.proposalOxidación Electrolítica por Plasmaspa
dc.subject.proposalAprovechamiento de residuosspa
dc.subject.proposalAguas residuales industrialesspa
dc.subject.proposalReducción de Cr (VI)spa
dc.subject.proposalFotoelectrocatálisisspa
dc.subject.proposalRecubrimientos de TiO2/Nispa
dc.subject.proposalPlasma electrolytic oxidationeng
dc.subject.proposalWaste recyclingeng
dc.subject.proposalIndustrial wastewatereng
dc.subject.proposalCr (VI) reductioneng
dc.subject.proposalPhotoelectrocatalysiseng
dc.subject.proposalTiO2/Ni coatingseng
dc.titleReducción de cromo (VI) de agua de la industria del cromado empleando recubrimientos TiO2/Ni obtenidos mediante oxidación electrolítica por plasmaspa
dc.title.translatedChromium (VI) reduction in wastewater from chrome plating industry using TiO2/Ni coatings obtained by plasma electrolytic oxidationeng
dc.typeTrabajo de grado - Maestríaspa
dc.type.coarhttp://purl.org/coar/resource_type/c_bdccspa
dc.type.coarversionhttp://purl.org/coar/version/c_ab4af688f83e57aaspa
dc.type.contentTextspa
dc.type.driverinfo:eu-repo/semantics/masterThesisspa
dc.type.versioninfo:eu-repo/semantics/acceptedVersionspa
dcterms.audience.professionaldevelopmentBibliotecariosspa
dcterms.audience.professionaldevelopmentEstudiantesspa
dcterms.audience.professionaldevelopmentInvestigadoresspa
dcterms.audience.professionaldevelopmentMaestrosspa
dcterms.audience.professionaldevelopmentPúblico generalspa
oaire.accessrightshttp://purl.org/coar/access_right/c_abf2spa

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