dc.creatorFerrari, Gabriela Verónica
dc.creatorAndrada, María Elisa
dc.creatorNatera, Jose Eduardo
dc.creatorMuñoz, Vanesa Alejandra
dc.creatorMontaña, Maria Paulina
dc.creatorGambetta, Carolina
dc.creatorBoiero, María Laura
dc.creatorMontenegro, Mariana Angélica
dc.creatorMassad, Walter Alfredo
dc.creatorGarcia, Norman Andino
dc.date.accessioned2016-09-07T19:11:03Z
dc.date.accessioned2018-11-06T14:20:43Z
dc.date.available2016-09-07T19:11:03Z
dc.date.available2018-11-06T14:20:43Z
dc.date.created2016-09-07T19:11:03Z
dc.date.issued2014-10
dc.identifierFerrari, Gabriela Verónica; Andrada, María Elisa; Natera, Jose Eduardo; Muñoz, Vanesa Alejandra; Montaña, Maria Paulina; et al.; The employment of a removable chitosan-derivatized polymeric sensitizer in the photooxidation of polyhydroxylated water-pollutants; Wiley; Photochemistry and Photobiology; 90; 6; 10-2014; 1251-1256
dc.identifier0031-8655
dc.identifierhttp://hdl.handle.net/11336/7514
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1885415
dc.description.abstractThe known O2(1g)-sensitizer system Chitosan bounded Rose Bengal (CH-RB), with Rose Bengal (RB) immobilized by irreversible covalent bonding to the polymer Chitosan (CH), soluble in aquous acidic medium, was employed in the photodegradation of three tri-hydroxy benzene water-contaminants (THBs). The system sensitizes the O2(1g)-mediated photodegradation of THBs by a process kinetically favored, as compared to that employing free RB dissolved in the same solvent. Additionally the free xanthene dye, degradable by O2(1g) through self-sensitization upon prolonged light-exposure, is considerably protected when bonded to CH-polymer. The polymeric sensitizer, totally insoluble in neutral medium, can be removed from the solution after the photodegradative cycle by precipitation through a simple pH change. This fact constitutes an interesting aspect in the context of photoremediation of confined polluted waters. In other words, the sensitizing system could be useful for avoiding to dissolve dyestuffs in the polluted waters, in order to act as conventional sunlight-absorbing dye-sensitizers. In parallel the interaction CH - O2(1g) in acidic solution was evaluated. The polymer quenches the oxidative species with a rate constant 2.4x108 M-1s-1 being the process mostly attributable to a physical interaction. This fact promotes the photoprotection of the bonded dye in the CH-RB polymer.
dc.languageeng
dc.publisherWiley
dc.relationinfo:eu-repo/semantics/altIdentifier/url/http://onlinelibrary.wiley.com/doi/10.1111/php.12350/abstract
dc.relationinfo:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1111/php.12350
dc.rightshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.rightsinfo:eu-repo/semantics/openAccess
dc.subjectChitosan
dc.subjectphotodegradation
dc.subjectpolymeric sensitizer
dc.subjectRose Bengal
dc.subjecttrihydroxybenzenes
dc.titleThe employment of a removable chitosan-derivatized polymeric sensitizer in the photooxidation of polyhydroxylated water-pollutants
dc.typeArtículos de revistas
dc.typeArtículos de revistas
dc.typeArtículos de revistas


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