Estudio termodinámico de la adsorción de parabenos desde solución acuosa sobre carbones activados modificados con sales metálicas

Los parabenos son compuestos orgánicos utilizados como conservantes en productos de cuidado personal, productos farmacéuticos, alimenticios e industriales. Siendo considerados como contaminantes emergentes debido a su actividad estrogénica, revelando una problemática ambiental de alto impacto. En es...

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Autores:: Moreno Marenco, Astrid Roxanna

Tipo de recurso:: Doctoral thesis

Fecha de publicación:: 2020

Institución:: Universidad Nacional de Colombia

Repositorio:: Universidad Nacional de Colombia

Idioma:: spa

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network_acronym_str	UNACIONAL2
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dc.title.spa.fl_str_mv	Estudio termodinámico de la adsorción de parabenos desde solución acuosa sobre carbones activados modificados con sales metálicas
title	Estudio termodinámico de la adsorción de parabenos desde solución acuosa sobre carbones activados modificados con sales metálicas
spellingShingle	Estudio termodinámico de la adsorción de parabenos desde solución acuosa sobre carbones activados modificados con sales metálicas 540 - Química y ciencias afines Parabenos Carbón activado Adsorción Activación química Calorimetría de inmersión Parabens Activated carbon Adsorption Chemical activation Immersion calorimetry
title_short	Estudio termodinámico de la adsorción de parabenos desde solución acuosa sobre carbones activados modificados con sales metálicas
title_full	Estudio termodinámico de la adsorción de parabenos desde solución acuosa sobre carbones activados modificados con sales metálicas
title_fullStr	Estudio termodinámico de la adsorción de parabenos desde solución acuosa sobre carbones activados modificados con sales metálicas
title_full_unstemmed	Estudio termodinámico de la adsorción de parabenos desde solución acuosa sobre carbones activados modificados con sales metálicas
title_sort	Estudio termodinámico de la adsorción de parabenos desde solución acuosa sobre carbones activados modificados con sales metálicas
dc.creator.fl_str_mv	Moreno Marenco, Astrid Roxanna
dc.contributor.advisor.spa.fl_str_mv	Giraldo Gutiérrez, Liliana
dc.contributor.author.spa.fl_str_mv	Moreno Marenco, Astrid Roxanna
dc.contributor.researchgroup.spa.fl_str_mv	Grupo de Calorimetría
dc.subject.ddc.spa.fl_str_mv	540 - Química y ciencias afines
topic	540 - Química y ciencias afines Parabenos Carbón activado Adsorción Activación química Calorimetría de inmersión Parabens Activated carbon Adsorption Chemical activation Immersion calorimetry
dc.subject.proposal.spa.fl_str_mv	Parabenos Carbón activado Adsorción Activación química Calorimetría de inmersión
dc.subject.proposal.eng.fl_str_mv	Parabens Activated carbon Adsorption Chemical activation Immersion calorimetry
description	Los parabenos son compuestos orgánicos utilizados como conservantes en productos de cuidado personal, productos farmacéuticos, alimenticios e industriales. Siendo considerados como contaminantes emergentes debido a su actividad estrogénica, revelando una problemática ambiental de alto impacto. En esta investigación se prepararon una serie de carbones activados a partir de cuesco de palma africana (Elaeis guineensis) por modificación química con soluciones de CaCl2 y MgCl2 variando la concentración entre 1- 2 % p/v con activación física a 973 K y 1173 K en atmósfera de CO2, con el fin de evaluar su influencia en las propiedades químicas y texturales de la adsorción de parabenos de cadena alifática desde el metil al butilparabeno desde solución acuosa. Las características fisicoquímicas de los sólidos se evaluaron en la adsorción de parabenos alifáticos lineales desde solución acuosa a 281 K y 291 K. Los carbones activados obtenidos son esencialmente microporos, los cuales desarrollaron mayores características texturales con el incremento en la temperatura de activación y la disminución en la concentración de agente activante, lo que favorece la adsorción de los parabenos encontrando capacidades de adsorción entre 76,3 y 269,2 mg.g-1. De igual forma las impregnaciones modificaron la química superficial, cambiando de esta manera las interacciones establecidas entre la superficie del carbón activado con los parabenos y el solvente. Los datos obtenidos del estudio de adsorción fueron complementados con determinaciones calorimétricas encontrando que el proceso de adsorción es de naturaleza exotérmica y física con entalpías de inmersión entre -3,59 y -52,12 J.g-1, que involucra las interacciones parabeno-carbón activado y solvente-carbón activado, mientras que la interacción específica entre el parabeno y el carbón activado es de naturaleza endotérmica que requiere de energía para el desplazamiento del solvente de la superficie del carbón activado, por lo que el proceso de adsorción se favorece con el aumento de la temperatura.
publishDate	2020
dc.date.accessioned.spa.fl_str_mv	2020-12-10T15:50:59Z
dc.date.available.spa.fl_str_mv	2020-12-10T15:50:59Z
dc.date.issued.spa.fl_str_mv	2020-08-03
dc.type.spa.fl_str_mv	Trabajo de grado - Doctorado
dc.type.driver.spa.fl_str_mv	info:eu-repo/semantics/doctoralThesis
dc.type.version.spa.fl_str_mv	info:eu-repo/semantics/acceptedVersion
dc.type.coar.spa.fl_str_mv	http://purl.org/coar/resource_type/c_db06
dc.type.content.spa.fl_str_mv	Text
format	http://purl.org/coar/resource_type/c_db06
status_str	acceptedVersion
dc.identifier.citation.spa.fl_str_mv	Moreno-Marenco Astrid Roxanna. Estudio termodinámico de la adsorción de parabenos desde solución acuosa sobre carbones activados modificados con sales metálicas. Universidad Nacional de Colombia. 2020
dc.identifier.uri.none.fl_str_mv	https://repositorio.unal.edu.co/handle/unal/78694
identifier_str_mv	Moreno-Marenco Astrid Roxanna. Estudio termodinámico de la adsorción de parabenos desde solución acuosa sobre carbones activados modificados con sales metálicas. Universidad Nacional de Colombia. 2020
url	https://repositorio.unal.edu.co/handle/unal/78694
dc.language.iso.spa.fl_str_mv	spa
language	spa
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spelling	Atribución-NoComercial-SinDerivadas 4.0 InternacionalDerechos reservados - Universidad Nacional de ColombiaAcceso abiertohttp://creativecommons.org/licenses/by-nc-nd/4.0/info:eu-repo/semantics/openAccesshttp://purl.org/coar/access_right/c_abf2Giraldo Gutiérrez, Lilianaedc3d8ac-85d8-465c-9149-13489f504282Moreno Marenco, Astrid Roxannad7369760-a447-450e-8ff0-96880d9cd91cGrupo de Calorimetría2020-12-10T15:50:59Z2020-12-10T15:50:59Z2020-08-03Moreno-Marenco Astrid Roxanna. Estudio termodinámico de la adsorción de parabenos desde solución acuosa sobre carbones activados modificados con sales metálicas. Universidad Nacional de Colombia. 2020https://repositorio.unal.edu.co/handle/unal/78694Los parabenos son compuestos orgánicos utilizados como conservantes en productos de cuidado personal, productos farmacéuticos, alimenticios e industriales. Siendo considerados como contaminantes emergentes debido a su actividad estrogénica, revelando una problemática ambiental de alto impacto. En esta investigación se prepararon una serie de carbones activados a partir de cuesco de palma africana (Elaeis guineensis) por modificación química con soluciones de CaCl2 y MgCl2 variando la concentración entre 1- 2 % p/v con activación física a 973 K y 1173 K en atmósfera de CO2, con el fin de evaluar su influencia en las propiedades químicas y texturales de la adsorción de parabenos de cadena alifática desde el metil al butilparabeno desde solución acuosa. Las características fisicoquímicas de los sólidos se evaluaron en la adsorción de parabenos alifáticos lineales desde solución acuosa a 281 K y 291 K. Los carbones activados obtenidos son esencialmente microporos, los cuales desarrollaron mayores características texturales con el incremento en la temperatura de activación y la disminución en la concentración de agente activante, lo que favorece la adsorción de los parabenos encontrando capacidades de adsorción entre 76,3 y 269,2 mg.g-1. De igual forma las impregnaciones modificaron la química superficial, cambiando de esta manera las interacciones establecidas entre la superficie del carbón activado con los parabenos y el solvente. Los datos obtenidos del estudio de adsorción fueron complementados con determinaciones calorimétricas encontrando que el proceso de adsorción es de naturaleza exotérmica y física con entalpías de inmersión entre -3,59 y -52,12 J.g-1, que involucra las interacciones parabeno-carbón activado y solvente-carbón activado, mientras que la interacción específica entre el parabeno y el carbón activado es de naturaleza endotérmica que requiere de energía para el desplazamiento del solvente de la superficie del carbón activado, por lo que el proceso de adsorción se favorece con el aumento de la temperatura.Parabens are organic compounds used as preservatives in personal care, pharmaceutical, food, and industrial products. Being considered as emerging pollutants due to its estrogenic activity, revealing a high impact environmental problem. In this research, a series of activated carbons were prepared from African palm shell (Elaeis guineensis) by chemical modification with CaCl2 and MgCl2 solutions varying the concentration between 1-2% w/v with physical activation at 973 K and 1173 K in an atmosphere of CO2 were prepared. The physicochemical characteristics of the solids were evaluated in the adsorption of linear aliphatic parabens from aqueous solution at 281 K and 291 K. The activated carbons obtained are essentially micropores, which developed greater textural characteristics with the increase in the activation temperature and the decrease in the concentration of the activating agent, which favors the adsorption of parabens, finding adsorption capacities between 76.3 and 269.2 mg.g-1. In the same way, the impregnations modified the surface chemistry, thus changing the interactions established between the surface of activated carbon with parabens and the solvent. The data obtained from the adsorption study were complemented with calorimetric determinations, finding that the adsorption process is exothermic and physical in nature with immersion enthalpies between -3.59 and -52.12 J.g-1, which involves the interactions paraben-activated carbon and solvent-activated carbon, while the specific interaction between paraben and activated carbon is endothermic in nature, requiring energy to displace the solvent from the surface of activated carbon, so the adsorption process is favored with increasing temperature.Colciencias, Convocatoria 727 de 2015Estudio termodinámico de la adsorción de parabenos desde solución acuosa sobre carbones activados modificados con sales metálicas FP44842-135-2017Línea de Investigación: TermodinámicaDoctorado146application/pdfspa540 - Química y ciencias afinesParabenosCarbón activadoAdsorciónActivación químicaCalorimetría de inmersiónParabensActivated carbonAdsorptionChemical activationImmersion calorimetryEstudio termodinámico de la adsorción de parabenos desde solución acuosa sobre carbones activados modificados con sales metálicasTrabajo de grado - Doctoradoinfo:eu-repo/semantics/doctoralThesisinfo:eu-repo/semantics/acceptedVersionhttp://purl.org/coar/resource_type/c_db06TextBogotá - Ciencias - Doctorado en Ciencias - QuímicaDepartamento de QuímicaUniversidad Nacional de Colombia - Sede BogotáOW/ORD Emerging Contaminants Workgroup Aquatic life criteria for contaminants of emerging concern. 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Express 2012, 2, 121–129.ORIGINAL52978683.2020.pdf52978683.2020.pdfapplication/pdf2622766https://repositorio.unal.edu.co/bitstream/unal/78694/1/52978683.2020.pdfae4d5d6c6229172ff469dd2e3a19c297MD51LICENSElicense.txtlicense.txttext/plain; charset=utf-83895https://repositorio.unal.edu.co/bitstream/unal/78694/2/license.txte2f63a891b6ceb28c3078128251851bfMD52CC-LICENSElicense_rdflicense_rdfapplication/rdf+xml; charset=utf-8811https://repositorio.unal.edu.co/bitstream/unal/78694/3/license_rdf217700a34da79ed616c2feb68d4c5e06MD53THUMBNAIL52978683.2020.pdf.jpg52978683.2020.pdf.jpgGenerated Thumbnailimage/jpeg5213https://repositorio.unal.edu.co/bitstream/unal/78694/4/52978683.2020.pdf.jpgd409f76d40c0373f67633254a7d22e8aMD54unal/78694oai:repositorio.unal.edu.co:unal/786942023-07-22 23:04:07.319Repositorio Institucional Universidad Nacional de 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GVyZWNob3MgZGUgYXV0b3IgcXVlIGNvbmxsZXZlIGxhIGRpc3RyaWJ1Y2nDs24gZGUgZXN0b3MgYXJjaGl2b3MgeSBtZXRhZGF0b3MuCkFsIGhhY2VyIGNsaWMgZW4gZWwgc2lndWllbnRlIGJvdMOzbiwgdXN0ZWQgaW5kaWNhIHF1ZSBlc3TDoSBkZSBhY3VlcmRvIGNvbiBlc3RvcyB0w6lybWlub3MuCg==

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