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Degradation of trinitrophenol by sequential catalytic wet air oxidation and solar TiO2 photocatalysis

dc.contributor.authorKatsoni, Athanasia
dc.contributor.authorGomes, Helder
dc.contributor.authorPastrana-Martínez, Luisa
dc.contributor.authorFaria, Joaquim
dc.contributor.authorFigueiredo, José
dc.contributor.authorMantzavinos, Dionissios
dc.contributor.authorSilva, Adrián
dc.date.accessioned2011-12-02T17:21:08Z
dc.date.available2011-12-02T17:21:08Z
dc.date.issued2011
dc.description.abstractCatalytic wet air oxidation (CWAO) and solar TiO2 photocatalysis were investigated as advanced oxidation processes to degrade trinitrophenol (TNP) in model aqueous solutions. An activated carbon (AC) treated with sulphuric acid of different concentrations (5, 10 and 18 M) at two different temperatures (353 and 423 K) was investigated as a metal-free CWAO catalyst, while a commercially available P25 TiO2 powder was used as a photocatalyst. CWAO experiments were conducted at 448 K, 0.7 MPa oxygen pressure (4.7 MPa of total pressure), 1.3 g L−1 AC loading and 270 mg L−1 TNP concentration, while photocatalytic experiments were conducted at ambient temperature, 1 g L−1 photocatalyst loading, 500–1000 W m−2 irradiance provided by a solar simulator and 32–270 mg L−1 TNP concentration. Treatment efficiency was assessed by measuring the concentrations of TNP and nitrates, total organic carbon (TOC) and biochemical oxygen demand (BOD5). Up to 90% TNP degradation was attained during CWAO over 120 min, from an initial concentration of 270 mg L−1. For the same TNP concentration, TiO2 photocatalysis gives only 13% conversion over the same 120 min. However, for TNP concentrations below 144 mg L−1, photocatalysis can be effectively used: 100 and 80% TNP degradation obtained in 120 min of irradiation for initial TNP concentrations of 64 and 144 mg L−1, respectively. In this respect, CWAO and photocatalysis were employed sequentially to treat TNP; complete TNP conversion being achieved after 120 min of CWAO followed by 60 min of photocatalysis at 1000 W m−2 irradiance, and this was accompanied by 82% TOC reduction, as well as an increase of BOD5/TOC ratio from 0 to 2.28.por
dc.identifier.citationKatsonia A., Gomes H.T., Pastrana-Martínez L.M. Faria J.L., Figueiredo J.L., Mantzavinos D., Silva A.M.T., Degradation of trinitrophenol by sequential catalytic wet air oxidation and solar TiO2 photocatalysis, Chemical Engineering Journal. ISSN 1385-8947. 172:2-3, p. 634-640por
dc.identifier.doi10.1016/j.cej.2011.06.022
dc.identifier.issn1385-8947
dc.identifier.urihttp://hdl.handle.net/10198/6369
dc.language.isoengpor
dc.peerreviewedyespor
dc.publisherElsevier
dc.relationDegradation of organic pollutants by catalytic wet peroxide oxidation using carbon materials
dc.subjectWater treatmentpor
dc.subjectCWAOpor
dc.subjectActivated carbonpor
dc.subjectProcess integrationpor
dc.subjectSolar photocatalysispor
dc.titleDegradation of trinitrophenol by sequential catalytic wet air oxidation and solar TiO2 photocatalysispor
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleDegradation of organic pollutants by catalytic wet peroxide oxidation using carbon materials
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876-PPCDTI/PTDC%2FAAC-AMB%2F110088%2F2009/PT
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/5876-PPCDTI/NANO%2FNTec-CA%2F0046%2F2007/PT
oaire.citation.endPage640por
oaire.citation.startPage634por
oaire.citation.titleChemical Engineering Journalpor
oaire.fundingStream5876-PPCDTI
oaire.fundingStream5876-PPCDTI
person.familyNameGomes
person.givenNameHelder
person.identifier.ciencia-id6218-1E19-13EE
person.identifier.orcid0000-0001-6898-2408
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccesspor
rcaap.typearticlepor
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relation.isAuthorOfPublication.latestForDiscovery0eb96337-224a-4339-9918-334436fbbb99
relation.isProjectOfPublication423797ec-e3f2-4dfd-9912-a7dbff024234
relation.isProjectOfPublicatione503de1b-555c-45fb-9642-491846722c3c
relation.isProjectOfPublication.latestForDiscoverye503de1b-555c-45fb-9642-491846722c3c

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