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Titolo:
Oxidative degradation of polyvinyl alcohol by the photochemically enhancedFenton reaction. Evidence for the formation of super-macromolecules
Autore:
Bossmann, SH; Oliveros, E; Gob, S; Kantor, M; Goppert, A; Braun, AM; Lei, LC; Yue, PL;
Indirizzi:
Univ Karlsruhe, Engler Bunte Inst, Lehrstuhl Umweltmesstech, D-76128 Karlsruhe, Germany Univ Karlsruhe Karlsruhe Germany D-76128 ech, D-76128 Karlsruhe, Germany Hong Kong Univ Sci & Technol, Dept Chem Engn, Kowloon, Hong Kong, Peoples R China Hong Kong Univ Sci & Technol Kowloon Hong Kong Peoples R China s R China
Titolo Testata:
PROGRESS IN REACTION KINETICS AND MECHANISM
fascicolo: 2-3, volume: 26, anno: 2001,
pagine: 113 - 137
SICI:
0079-6743(2001)26:2-3<113:ODOPAB>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
WASTE-WATER-TREATMENT; LARGE-SCALE DEVELOPMENT; AQUEOUS-SOLUTION; POLY(VINYL ALCOHOL); HYDROGEN-PEROXIDE; PHOTOELECTRO-FENTON; HYDROXYL RADICALS; ANODIC-OXIDATION; ELECTRO-FENTON; FERRIC-ION;
Keywords:
photochemically enhanced Fenton reaction; advanced oxidation processes; photochemical degradation; environmental pollutants; polyvinyl alcohol; gel permeation chromatography;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
57
Recensione:
Indirizzi per estratti:
Indirizzo: Bossmann, SH Univ Karlsruhe, Engler Bunte Inst, Lehrstuhl Umweltmesstech, Kaiserstr 12,D-76128 Karlsruhe, Germany Univ Karlsruhe Kaiserstr 12 Karlsruhe Germany D-76128 ermany
Citazione:
S.H. Bossmann et al., "Oxidative degradation of polyvinyl alcohol by the photochemically enhancedFenton reaction. Evidence for the formation of super-macromolecules", PROG REAC K, 26(2-3), 2001, pp. 113-137

Abstract

The reaction mechanism of the oxidative degradation of polyvinyl alcohol (PVA) by the photochemically enhanced Fenton reaction has been studied. Fastand efficient degradation was observed in a batch reactor, using a medium pressure mercury arc in a Pyrex envelope and employing 80% of the stoichiometric amount of H2O2 required for the total oxidation of PVA and a concentration ratio as low as 1 mole of iron(II) sulfate per 20 moles of PVA sub-units (C2H4O). Model PVA polymers of three different molecular weights (15,000, 49,000 and 100,000 g mol(-1)) were found to follow identical degradationpatterns. Strong experimental evidence supports the formation of super-macromolecules (MW: 1-5 X 10(6) g mol(-1)) consisting of oxidized PVA and trapped iron(HI) at an early reaction stage. Low molecular weight intermediates, such as oxalic acid, formic acid or formaldehyde were not found during the PVA degradation, and we may deduce that the manifold of degradation reactions is mainly taking place within the super-macromolecules from which CO2 is directly released.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 26/09/20 alle ore 01:44:29