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Role of nitrogen doping on the performance of carbon nanotube catalysts: a catalytic wet peroxide oxidation application

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dc.contributor.authorMartin-Martinez, Maria
dc.contributor.authorRibeiro, Rui
dc.contributor.authorMachado, Bruno
dc.contributor.authorSerp, Philippe
dc.contributor.authorMorales-Torres, Sergio
dc.contributor.authorSilva, Adrián
dc.contributor.authorFigueiredo, José
dc.contributor.authorFaria, Joaquim
dc.contributor.authorGomes, Helder
dc.date.accessioned2016-08-30T09:02:54Z
dc.date.available2016-08-30T09:02:54Z
dc.date.issued2016
dc.description.abstractFour magnetic carbon nanotube samples (CNTs: undoped, completely N-doped and two selectively N-doped) have been synthesized by chemical vapor deposition. The materials were tested in the catalytic wet peroxide oxidation (CWPO) of highly concentrated 4 nitrophenol solutions (4-NP, 5 g L-1). Relatively mild operating conditions were considered (atmospheric pressure, T = 50 ºC, pH = 3), using a catalyst load of 2.5 g L-1 and the stoichiometric amount of H2O2 needed for the complete mineralization of 4-NP. N doping was identified to influence considerably the CWPO performance of the materials. In particular, undoped CNTs, with a moderate hydrophobicity, favor the controllable and efficient decomposition of H2O2 into highly reactive hydroxyl radicals (HO•), thus showing high catalytic activity for 4-NP degradation. On the other hand, the completely N-doped catalyst, fully hydrophilic, favors a quick decomposition of H2O2 into non-reactive O2 and H2O species. The selectively N-doped amphiphilic catalysts, i.e. hybrid structures containing undoped sections followed by N-doped ones, provided intermediate results, namely: a higher N content favored H2O2 decomposition towards non-reactive H2O and O2 species, whilst a lower N content resulted in the formation of HO•, increasing 4-NP mineralization. Catalyst stability and reusability were also investigated by consecutive CWPO runs.pt_PT
dc.identifier.citationMartin-Martinez, Maria; Ribeiro, Rui S.; Machado, Bruno F.; Serp, Philippe; Morales-Torres, Sergio; Silva, Adrián M.T.; Figueiredo José L.; Faria Joaquim L.; Gomes, Helder (2016). The role of nitrogen doping in the performance of carbon nanotube catalysts: a catalytic wet peroxide oxidation application. ChemCatChem. ISSN 1867-3880. 8, p. 2068-2078pt_PT
dc.identifier.doi10.1002/cctc.201600123pt_PT
dc.identifier.eissn1867-3899
dc.identifier.issn1867-3880
dc.identifier.urihttp://hdl.handle.net/10198/13167
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/pt_PT
dc.subjectDopingpt_PT
dc.subjectEnvironmental chemistrypt_PT
dc.subjectHeterogeneous catalysispt_PT
dc.subjectNanotubespt_PT
dc.subjectNitrogenpt_PT
dc.subjectOxidationpt_PT
dc.titleRole of nitrogen doping on the performance of carbon nanotube catalysts: a catalytic wet peroxide oxidation applicationpt_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage2078pt_PT
oaire.citation.issue12pt_PT
oaire.citation.startPage2068pt_PT
oaire.citation.titleChemCatChempt_PT
oaire.citation.volume8pt_PT
person.familyNameGomes
person.givenNameHelder
person.identifier.ciencia-id6218-1E19-13EE
person.identifier.orcid0000-0001-6898-2408
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication0eb96337-224a-4339-9918-334436fbbb99
relation.isAuthorOfPublication.latestForDiscovery0eb96337-224a-4339-9918-334436fbbb99

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