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Activated carbon xerogel-chitosan composite materials for catalytic wet peroxide oxidation under intensified process conditions

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dc.contributor.authorPinho, Maria
dc.contributor.authorSilva, Adrián
dc.contributor.authorFathy, Nady
dc.contributor.authorAttia, Amina
dc.contributor.authorGomes, Helder
dc.contributor.authorFaria, Joaquim
dc.date.accessioned2015-06-22T10:25:23Z
dc.date.available2015-06-22T10:25:23Z
dc.date.issued2015
dc.description.abstractDifferent activated carbon xerogels (ACX) and ACX–chitosan composite materials were tested for the removal of the azo dye Orange II (OII) in aqueous solutions, either by pure adsorption or by catalytic wet peroxide oxidation (CWPO). The ACX materials were produced by activation of an organic resorcinol formaldehyde xerogel (RFX), considering different activation procedures: chemical impregnation with H3PO4 at 773 K (ACX-P), chemical impregnation with monoethanolamine at 773 K (ACX–MEA) and alkali activation with KOH at 1073 K using a 1:1 mass ratio of KOH/RFX (ACX-K). The ACX–chitosan composites were produced by oxidation of ACX with oxalic acid followed by treatment with chitosan gel. During screening studies in adsorption and CWPO tests, the composites ACX-K–chitosan and ACX-P–chitosan revealed the best performances among all the tested materials, namely OII removals between 69 and 73% were respectively obtained in CWPO after 150 min (pH 3.0, T = 323 K, material load of 0.2 g L-1, OII concentration of 100 mg L-1 and hydrogen peroxide concentration of 1.18 g L-1). In process intensification conditions, the CWPO process performance increased remarkably when using the ACX-P–chitosan composite. Complete OII removal in 90 min and a TOC removal of 55% in 24 h was achieved by CWPO, while less than 10% of OII was removed by pure adsorption (pH 3.5, T = 353 K, material load of 2.5 g L-1, OII concentration of 4.5 g L-1 and, in CWPO, hydrogen peroxide concentration of 25 g L-1). The superior performance of the ACX–chitosan composite at intensified process conditions was more likely related with the high pollutant/catalyst ratio, which favors a more controllable H2O2 decomposition near the adsorbed pollutant species, thus avoiding parallel parasite reactions involving hydroxyl radicals and leading to a consequent higher efficiency of its usage. These conditions are of major interest in the treatment of highly polluted waste waters.por
dc.identifier.citationPinho, Maria; Silva, Adrián; Fathy, Nady; Attia, Amina; Gomes, Helder; Faria, Joaquim (2015). Activated carbon xerogel-chitosan composite materials for catalytic wet peroxide oxidation under intensified process conditions. Journal of Environmental Chemical Engineering. 3, p. 1243-1251por
dc.identifier.doi10.1016/j.jece.2014.10.020
dc.identifier.urihttp://hdl.handle.net/10198/11887
dc.language.isoengpor
dc.peerreviewedyespor
dc.subjectActivated carbon xerogel–chitosan compositespor
dc.subjectOrange IIpor
dc.subjectCatalytic wet peroxide oxidationpor
dc.subjectHydrogen peroxidepor
dc.subjectIntensified process conditionspor
dc.titleActivated carbon xerogel-chitosan composite materials for catalytic wet peroxide oxidation under intensified process conditionspor
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage1251por
oaire.citation.startPage1243por
oaire.citation.titleJournal of Environmental Chemical Engineeringpor
oaire.citation.volume3por
person.identifier.ciencia-id6218-1E19-13EE
person.identifier.orcid0000-0001-6898-2408
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
relation.isAuthorOfPublication0eb96337-224a-4339-9918-334436fbbb99
relation.isAuthorOfPublication.latestForDiscovery0eb96337-224a-4339-9918-334436fbbb99

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