Publication
Enhanced performance of cobalt ferrite encapsulated in graphitic shell by means of AC magnetically activated catalytic wet peroxide oxidation of 4-nitrophenol
| dc.contributor.author | Ribeiro, Rui | |
| dc.contributor.author | Gallo, Juan | |
| dc.contributor.author | Bañobre-López, Manuel | |
| dc.contributor.author | Silva, Adrián | |
| dc.contributor.author | Faria, Joaquim | |
| dc.contributor.author | Gomes, Helder | |
| dc.date.accessioned | 2018-02-19T10:00:00Z | |
| dc.date.accessioned | 2019-01-28T11:54:52Z | |
| dc.date.available | 2018-01-19T10:00:00Z | |
| dc.date.available | 2019-01-28T11:54:52Z | |
| dc.date.issued | 2018 | |
| dc.description.abstract | Here we report preliminary catalytic wet peroxide oxidation (CWPO) experiments performed in the presence of an alternating current (AC) magnetic field. One ferromagnetic graphitic nanocomposite – composed by a cobalt ferrite core and a graphitic shell (CoFe2O4/MGNC), was employed in the process, here named magnetically activated catalytic wet peroxide oxidation (MA-CWPO). An aqueous solution containing 5.0 g L−1 of 4-nitrophenol (4-NP) to simulate a high strength polluted stream was used as model system. The experiments were performed at room temperature and atmospheric pressure, with stoichiometric amount of hydrogen peroxide (H2O2), pH=3 and CoFe2O4/MGNC catalyst load=5.0 g L−1 (corresponding to a 4-NP/CoFe2O4 mass ratio of 6.9, as CoFe2O4 accounts for 14.4 wt% of CoFe2O4/MGNC). It was shown that the performance of CWPO is enhanced upon application of an AC magnetic field (frequency of 533.9 kHz and magnitude of 240 G). As a result, high 4-NP mineralization was obtained by MA-CWPO (as reflected by a total organic carbon abatement of 79% after 4 h of reaction, instead of 39% in the absence of a magnetic field). This positive effect was ascribed to the localised increase of CoFe2O4/MGNC surface temperature resulting from heat release upon exposure of the nanoparticulated catalyst to an AC magnetic field, which accelerates the catalytic decomposition of H2O2 via hydroxyl radicals (HO%) formation. | |
| dc.description.version | info:eu-repo/semantics/publishedVersion | en_EN |
| dc.identifier.citation | Ribeiro, Rui; Gallo, Juan; Bañobre-López, Manuel; Silva, Adrián; Faria, Joaquim L.; Gomes, Helder T. (2018). Enhanced performance of cobalt ferrite encapsulated in graphitic shell by means of AC magnetically activated catalytic wet peroxide oxidation of 4-nitrophenol. Chemical Engineering Journal. ISSN 1385-8947. p. 1-7 | en_EN |
| dc.identifier.doi | 10.1016/j.cej.2018.09.173 | en_EN |
| dc.identifier.issn | 1385-8947 | |
| dc.identifier.uri | http://hdl.handle.net/10198/18577 | |
| dc.language.iso | eng | |
| dc.peerreviewed | yes | en_EN |
| dc.subject | Core-shell nanocomposites | en_EN |
| dc.subject | CWPO | en_EN |
| dc.subject | Ferromagnetic composites | en_EN |
| dc.subject | Heterogeneous Fenton process | en_EN |
| dc.subject | Magnetic hyperthermia | en_EN |
| dc.title | Enhanced performance of cobalt ferrite encapsulated in graphitic shell by means of AC magnetically activated catalytic wet peroxide oxidation of 4-nitrophenol | en_EN |
| dc.type | journal article | |
| dspace.entity.type | Publication | |
| oaire.awardURI | info:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F94177%2F2013/PT | |
| oaire.fundingStream | SFRH | |
| person.familyName | Gomes | |
| person.givenName | Helder | |
| person.identifier.ciencia-id | 6218-1E19-13EE | |
| person.identifier.orcid | 0000-0001-6898-2408 | |
| project.funder.identifier | http://doi.org/10.13039/501100001871 | |
| project.funder.name | Fundação para a Ciência e a Tecnologia | |
| rcaap.rights | openAccess | en_EN |
| rcaap.type | article | en_EN |
| relation.isAuthorOfPublication | 0eb96337-224a-4339-9918-334436fbbb99 | |
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