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Lignin-based activated carbons as metal-free catalysts for the oxidative degradation of 4-nitrophenol in aqueous solution

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dc.contributor.authorMartin-Martinez, Maria
dc.contributor.authorBarreiro, M.F.
dc.contributor.authorSilva, Adrián
dc.contributor.authorFigueiredo, José
dc.contributor.authorFaria, Joaquim
dc.contributor.authorGomes, Helder
dc.date.accessioned2019-09-03T10:17:03Z
dc.date.available2019-09-03T10:17:03Z
dc.date.issued2017
dc.description.abstractA wheat and hemp lignin, obtained from a soda pulping-precipitation process, was carbonized at 800 ◦C under N2 atmosphere. The resulting carbon material was thermally activated under oxidative atmosphere at four different temperatures (150, 200, 300 and 350 ◦C). The materials prepared at higher activation temperatures (300 and 350 ◦C) have proven their potential in the elimination of 4-nitrophenol (4-NP) from aqueous model solutions (5 g L−1) when using catalytic wet peroxide oxidation (CWPO). In these conditions we were able to remove around 70% of 4-NP after 24 h, with an efficient H2O2 decomposition, in experiments conducted at relatively mild operating conditions (atmospheric pressure, 50 ◦C, pH = 3, catalyst load = 2.5 g L−1 and [H2O2]0 = 17.8 g L−1). By increasing the working temperature to 80 ◦C, complete 4-NP removal was obtained within 48 h (against 93% 4-NP removal at 50 ◦C), with an efficiency of H2O2 consumption of 70% and a significant mineralization (61%). On the other hand, the materials prepared at lower activation temperatures (150 and 200 ◦C), with higher basicity, promote the faster but inefficient H2O2 decomposition, 4-NP removal being lower than 25% after 24 h at 50 ◦C in CWPO. This can be attributed to the formation of species other than HO• radicals during H2O2 decomposition, the recombination of the formed radicals into non-reactive species and a poor adsorption capacity.pt_PT
dc.description.sponsorshipThis work was financially supported by Project POCI-01-0145-FEDER-006984–Associate Laboratory LSRE-LCM, funded by FEDER through COMPETE2020 − Programa Operacional Competitividade e Internacionalização (POCI) − and by national funds through FCT − Fundação para a Ciência e a Tecnologia, and Project AIProcMat@N2020 − Advanced Industrial Processes and Mate-rials for a Sustainable Northern Region of Portugal 2020, withthe reference NORTE-01-0145-FEDER-000006, supported by Norte Portugal Regional Operational Programme (NORTE 2020), underthe Portugal 2020 Partnership Agreement, through the European Regional Development Fund (FEDER). M. Martin Martinez and A.M.T. Silva acknowledge respectively financial support from the FCT Postdoctoral grant SFRH/BPD/108510/2015 and the FCT Inves-tigator 2013 ProgrammeIF/01501/2013 with financing from theEuropean Social Fund and the Human Potential Operational Programme.pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationMartin-Martinez, Maria; Barreiro, M.F.; Silva, Adrián; Figueiredo, José; Faria, Joaquim; Gomes, Helder (2017). Lignin-based activated carbons as metal-free catalysts for the oxidative degradation of 4-nitrophenol in aqueous solution. Applied Catalysis B: Environmental. ISSN 1873-3883. 219, p. 372-378pt_PT
dc.identifier.doi10.1016/j.apcatb.2017.07.065pt_PT
dc.identifier.urihttp://hdl.handle.net/10198/19525
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.relationTreatment of oily wastewater by oxidation with amphiphilic carbon-based catalysts
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectLigninpt_PT
dc.subjectPhysical activationpt_PT
dc.subjectActivated carbonpt_PT
dc.subjectCWPOpt_PT
dc.subjectH2O2 efficiencypt_PT
dc.titleLignin-based activated carbons as metal-free catalysts for the oxidative degradation of 4-nitrophenol in aqueous solutionpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleTreatment of oily wastewater by oxidation with amphiphilic carbon-based catalysts
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/FARH/SFRH%2FBPD%2F108510%2F2015/PT
oaire.citation.endPage378pt_PT
oaire.citation.startPage372pt_PT
oaire.citation.titleApplied Catalysis B: Environmentalpt_PT
oaire.citation.volume219pt_PT
oaire.fundingStreamFARH
person.familyNameBarreiro
person.familyNameGomes
person.givenNameFilomena
person.givenNameHelder
person.identifier.ciencia-id3418-47D5-5746
person.identifier.ciencia-id6218-1E19-13EE
person.identifier.orcid0000-0002-6844-333X
person.identifier.orcid0000-0001-6898-2408
person.identifier.ridL-9802-2014
person.identifier.scopus-author-id57188719717
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication0391987c-ba90-488b-839a-153447ce1f0f
relation.isAuthorOfPublication0eb96337-224a-4339-9918-334436fbbb99
relation.isAuthorOfPublication.latestForDiscovery0391987c-ba90-488b-839a-153447ce1f0f
relation.isProjectOfPublication4086a8ad-e377-4cd2-9dac-fa7a376369ac
relation.isProjectOfPublication.latestForDiscovery4086a8ad-e377-4cd2-9dac-fa7a376369ac

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