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Janus amphiphilic carbon nanotubes as Pickering interfacial catalysts for the treatment of oily wastewater by selective oxidation with hydrogen peroxide

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dc.contributor.authorDíaz de Tuesta, Jose Luis
dc.contributor.authorMachado, Bruno
dc.contributor.authorSerp, Philippe
dc.contributor.authorSilva, Adrián
dc.contributor.authorFaria, Joaquim
dc.contributor.authorGomes, Helder
dc.date.accessioned2020-12-03T09:45:07Z
dc.date.available2020-12-03T09:45:07Z
dc.date.issued2020
dc.description.abstractJanus-like amphiphilic carbon nanotubes (CNTs) were tested as catalysts in the oxidation of 2-nitrophenol (2- NP) with hydrogen peroxide. A biphasic oil-water medium was used to simulate oily wastewater contaminated with the lipophilic model pollutant 2-NP. The CNTs were synthesized by sequentially feeding ethylene and/or acetonitrile, used as carbon and carbon/nitrogen precursors, respectively. The results obtained for 2-NP removal using biphasic systems were compared with those obtained by CWPO using aqueous solutions. The most active catalyst in the CWPO of 2-NP in aqueous solution was the CNT synthesized only with ethylene. This was explained by its high lipophilic character, allowing the complete removal of 2NP after 24 h of reaction at 50 °C, pH0 = 3, Ccat = 0.25 g L−1, C2-NP,0 = 0.5 g L−1 and the stoichiometric quantity of H2O2 needed for the total mineralization of 2-NP. For the oxidation of 2-NP in biphasic medium, only the Janus-like amphiphilic CNTs (containing a lipophilic undoped section synthetized from ethylene and a hydrophilic N-doped section synthetized from acetonitrile) revealed catalytic activity for the removal of 2-NP. The conversion of 2NP reached in biphasic oxidation conditions was 76.7% after 24 h of reaction at 50 °C, considering pH0 = 3, Ccat = 2.27 g L−1 of total volume (water/oil ratio of 16:50 v/v) and C2-NP,oil,0 = 5 g L−1. This removal was ascribed to the formation of Pickering emulsions, by maximizing the interfacial area through an increased contact between the catalyst and both liquid phases. A kinetic model is proposed to accurately predict the experimental data and evaluate the rate constants of the process and its variation with the prepared CNTs.pt_PT
dc.description.sponsorshipThis work is a result of the Project “PLASTIC_TO_FUEL&MAT - Upcycling Waste Plastics into Fuel and Carbon Nanomaterials”, with the reference POCI-01-0145-FEDER-031439, supported by national funds through FCT and by the European Regional Development Fund (ERDF); the Project “AIProcMat@N2020 - Advanced Industrial Processes and Materials for a Sustainable Northern Region of Portugal 2020″, with the reference NORTE-01-0145-FEDER-000006, supported by Norte Portugal Regional Operational Programme (NORTE 2020), under the Portugal 2020 Partnership Agreement, through ERDF; and the Associate Laboratory LSRE-LCM - UID/EQU/50020/2019 - funded by national funds through FCT/MCTES (PIDDAC). Bruno F. Machado acknowledges the financial support of the exploratory project under the FCT Investigator Programme (ref. IF/00301/2015) with the financial support of FCT/MCTES through national funds (PIDDAC).pt_PT
dc.description.versioninfo:eu-repo/semantics/publishedVersionpt_PT
dc.identifier.citationDíaz de Tuesta, Jose Luis; Machado, Bruno F.; Serp, Philippe; Silva, Adrián; Faria, Joaquim L.; Gomes, Helder (2020). Janus amphiphilic carbon nanotubes as Pickering interfacial catalysts for the treatment of oily wastewater by selective oxidation with hydrogen peroxide. Catalysis Today . ISSN 0920-5861. 356, p. 216-225pt_PT
dc.identifier.doi10.1016/j.cattod.2019.07.012pt_PT
dc.identifier.issn0920-5861
dc.identifier.urihttp://hdl.handle.net/10198/22915
dc.language.isoengpt_PT
dc.peerreviewedyespt_PT
dc.rights.urihttp://creativecommons.org/licenses/by-nc/4.0/pt_PT
dc.subjectJanuspt_PT
dc.subjectCarbon nanotubespt_PT
dc.subjectOily wastewaterpt_PT
dc.subjectAmphiphilic catalystspt_PT
dc.subjectCWPOpt_PT
dc.subjectBiphasic oxidationpt_PT
dc.subjectLipophilic pollutantpt_PT
dc.titleJanus amphiphilic carbon nanotubes as Pickering interfacial catalysts for the treatment of oily wastewater by selective oxidation with hydrogen peroxidept_PT
dc.typejournal article
dspace.entity.typePublication
oaire.citation.endPage215pt_PT
oaire.citation.startPage205pt_PT
oaire.citation.titleCatalysis Todaypt_PT
oaire.citation.volume356pt_PT
person.familyNameDíaz de Tuesta
person.familyNameGomes
person.givenNameJose Luis
person.givenNameHelder T.
person.identifier.ciencia-id7A1F-022B-7DBF
person.identifier.ciencia-id6218-1E19-13EE
person.identifier.orcid0000-0003-2408-087X
person.identifier.orcid0000-0001-6898-2408
person.identifier.ridD-9785-2017
person.identifier.scopus-author-id55755821600
rcaap.rightsrestrictedAccesspt_PT
rcaap.typearticlept_PT
relation.isAuthorOfPublication2ad0465f-5f8a-4b14-90f5-bf85996f9ce1
relation.isAuthorOfPublication0eb96337-224a-4339-9918-334436fbbb99
relation.isAuthorOfPublication.latestForDiscovery0eb96337-224a-4339-9918-334436fbbb99

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