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dc.contributor.author
Sacchetto, Julieta Lorena  
dc.contributor.author
Natera, Jose Eduardo  
dc.contributor.author
Massad, Walter Alfredo  
dc.contributor.author
Gatica, Eduardo Antonio  
dc.date.available
2024-04-22T14:55:29Z  
dc.date.issued
2021  
dc.identifier.citation
Degradation of polyphenolic contaminants using a natural polymeric dye of riboflavin-5´phosphate cross-linked chitosan as photosensitizer; CataLight Young Scientist Symposium: Light Driven Catalysis; Wien; Alemania; 2020; 58-59  
dc.identifier.uri
http://hdl.handle.net/11336/233780  
dc.description.abstract
Generally, water treatment plants fail to completely eliminate pollutants, thus resulting in some contaminants passing into water bodies, producing harmful effects on the environment. One of the main environmental pollutants degradation mechanisms are chemical pathway, which involve several transformations, some of them take place in the presence of solar radiation known as direct or sensitized photoreactions. The emphasis will be on a sensitized photolysis reaction, involving the presence of another chemical, a dye that absorbs light radiation and produce excited states capable of inducing a photoprocess cascade, in which highly reactive species are formed. Besides, the dyes used in the photodegradation processes have the disadvantage that these dyes remain in the environment. The main issue with these methods lies in extracting the dye once the reaction is complete. This problem may be reduced, or fully solved with the use of polymeric dyes (PD), whose water solubility varieswith the pH of the solution. In this case, the photosensitized contaminant degradation occurs while the PD is dissolved in acid media.The PD consists of two natural compounds, specifically the sensitizer riboflavin 5´-phosphate (FMN) and chitosan(CH), which makes PD fully aquatic-friendly. 1-Ethyl-3-(3-dimethylaminopropyl) carbodiimide (EDC) was used for PD synthesis as a crosslinker to create a phosphoramidate bond via EDC, which is formed by the FMN phosphate group and the CH amino group. A polymer of the same colour and similar photophysical properties of free sensitizer was obtained. Another important feature of this PD is that it is more photostable than the free dye and is readily removed by pH shift from the medium since it is soluble in solution of acetic acid and precipitates in solution of pH>5.9. Polyphenols (THB) were selected to test the photocatalytic activity of the synthesized polymer. THBs are known pollutants that are reactive to singlet oxygen (1O2) in homogeneous media. Oxygen uptake and UV-Vis spectroscopy monitored the photosensitised oxidation of THBs by PD. These results are comparing with those obtained using the free sensitizer. Different scavengers were used to evaluate the reactive oxygen species (ROS) involvement in the degradation process. The participation of 1O2, H2O2 and HO· in the degradation of THBs were studied in these experiments. In addition, laser flash photolysis studies have shown that CP?s ectronically excited states are also involved in THB degradation. The use of the CP in the photosensitized process represents a great advantage over the free dye and heterogeneous sytems. The CP has a higher photostability, which allows it to be used for longer periods of times. It does not present the diffusion problems intrinsic to heterogeneous media. Finally, one of the most promising characteristics of these CP, is that it can be extracted after photosensitized reaction, leaving the aquatic environments free of pollutants or pigments. This environmental friendly CP, provides a practical solution for those who are immersed in the subject of environment remediation or water treatment technologies  
dc.format
application/pdf  
dc.language.iso
eng  
dc.publisher
CataLight  
dc.rights
info:eu-repo/semantics/restrictedAccess  
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/  
dc.subject
Chitosan  
dc.subject
Polimeric Polymer  
dc.subject
Singlet Oxygen  
dc.subject
Riboflavin-5-phosphate  
dc.subject.classification
Físico-Química, Ciencia de los Polímeros, Electroquímica  
dc.subject.classification
Ciencias Químicas  
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CIENCIAS NATURALES Y EXACTAS  
dc.title
Degradation of polyphenolic contaminants using a natural polymeric dye of riboflavin-5´phosphate cross-linked chitosan as photosensitizer  
dc.type
info:eu-repo/semantics/publishedVersion  
dc.type
info:eu-repo/semantics/conferenceObject  
dc.type
info:ar-repo/semantics/documento de conferencia  
dc.date.updated
2024-04-16T09:57:52Z  
dc.journal.pagination
58-59  
dc.journal.pais
Alemania  
dc.journal.ciudad
Berlin  
dc.description.fil
Fil: Sacchetto, Julieta Lorena. Universidad Nacional de Río Cuarto. Instituto para el Desarrollo Agroindustrial y de la Salud. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto para el Desarrollo Agroindustrial y de la Salud; Argentina  
dc.description.fil
Fil: Natera, Jose Eduardo. Universidad Nacional de Río Cuarto. Instituto para el Desarrollo Agroindustrial y de la Salud. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto para el Desarrollo Agroindustrial y de la Salud; Argentina  
dc.description.fil
Fil: Massad, Walter Alfredo. Universidad Nacional de Río Cuarto. Instituto para el Desarrollo Agroindustrial y de la Salud. - Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto para el Desarrollo Agroindustrial y de la Salud; Argentina  
dc.description.fil
Fil: Gatica, Eduardo Antonio. Universidad Nacional de Río Cuarto; Argentina  
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://chemie.univie.ac.at/wissensaustausch/events/detail/news/1-catalight-young-scientist-symposium-light-driven-catalysis/?no_cache=1&cHash=b6ddd37398feae47f75a4a6a0eed8ba7  
dc.conicet.rol
Autor  
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Autor  
dc.conicet.rol
Autor  
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Autor  
dc.coverage
Internacional  
dc.type.subtype
Simposio  
dc.description.nombreEvento
CataLight Young Scientist Symposium: Light Driven Catalysis  
dc.date.evento
2020-11-10  
dc.description.ciudadEvento
Wien  
dc.description.paisEvento
Alemania  
dc.type.publicacion
Book  
dc.description.institucionOrganizadora
CataLight  
dc.description.institucionOrganizadora
Deutsche Forschungsgemeinschaft  
dc.source.libro
1st CataLight Young Scientist Symposium: Book of abstracts  
dc.source.revista
Libro de Resúmenes  
dc.date.eventoHasta
2020-11-26  
dc.type
Simposio