Publication
Catalytic wet peroxide oxidation with modified carbon nanotubes
| dc.contributor.author | Martin-Martinez, Maria | |
| dc.contributor.author | Machado, Bruno | |
| dc.contributor.author | Serp, Philippe | |
| dc.contributor.author | Morales-Torres, Sergio | |
| dc.contributor.author | Silva, Adrián | |
| dc.contributor.author | Figueiredo, José | |
| dc.contributor.author | Faria, Joaquim | |
| dc.contributor.author | Gomes, Helder | |
| dc.date.accessioned | 2020-01-15T10:13:08Z | |
| dc.date.available | 2020-01-15T10:13:08Z | |
| dc.date.issued | 2018 | |
| dc.description.abstract | Catalytic wet peroxide oxidation (CWPO) uses H2O2 as a source of hydroxyl radicals (HO) for the oxidation of organic species. This process is regarded as a potential solution for the treatment of aqueous effluents containing recalcitrant and toxic organic pollutants, difficult to remove by conventional biological processes, mainly if present at high concentrations (1- 10 g L-1) [1]. In a recent study, three magnetic carbon nanotube (CNT) samples, named A30 (N-doped), E30 (undoped) and E10A20 (partially N-doped), were synthesized by chemical vapor deposition and tested in the CWPO process [2]. It was revealed that N-doped hydrophilic surfaces promoted a fast decomposition of H2O2 into non-reactive species (H2O and O2), limiting the CWPO performance. In the present study, the surface of the CNTs was modified by introducing oxygenated surface groups (oxidation with HNO3, samples CNT-N), and by heat treatment at 800 °C for the removal of surface functionalities (samples CNT-HT). The effect of these modifications was analysed during 24-hours- CWPO-experiments of highly concentrated 4-nitrophenol solutions (4-NP, 5 g L-1), at atmospheric pressure and 50 °C, adjusting the initial pH to 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. Given the magnetic properties of the Fe nanoparticles encapsulated inside the CNTs (formed during the CVD synthesis), catalyst separation | pt_PT |
| dc.description.sponsorship | This work was financially supported by Projects NORTE-01-0145-FEDER-000006 (NORTE 2020, ERDF) and POCI-01-0145-FEDER-006984–Associate Laboratory LSRE-LCM (COMPETE2020, ERDF). M. Martín Martínez and B.F. Machado acknowledge the FCT Postdoc grant SFRH/BPD/108510/2015 and the FCT Investigator 2015 Programme IF/00301/2015, respectively. | pt_PT |
| dc.description.version | info:eu-repo/semantics/publishedVersion | pt_PT |
| dc.identifier.citation | Martin-Martinez, Maria; Machado, Bruno; Serp, Philippe; Morales-Torres, Sergio; Silva, Adrián; Figueiredo, Jose Luis; Faria, Joaquim; Gomes, Helder (2018). Catalytic wet peroxide oxidation with modified carbon nanotubes. In CarboCat VIII - 8th International Symposium on Carbon for Catalysis. Porto. ISBN 978-989-8124-22-7 | pt_PT |
| dc.identifier.isbn | 978-989-8124-22-7 | |
| dc.identifier.uri | http://hdl.handle.net/10198/20375 | |
| dc.language.iso | eng | pt_PT |
| dc.peerreviewed | yes | pt_PT |
| dc.rights.uri | http://creativecommons.org/licenses/by-nc/4.0/ | pt_PT |
| dc.title | Catalytic wet peroxide oxidation with modified carbon nanotubes | pt_PT |
| dc.type | conference object | |
| dspace.entity.type | Publication | |
| oaire.citation.conferencePlace | Porto, Portugal | pt_PT |
| oaire.citation.startPage | 125 | pt_PT |
| oaire.citation.title | CarboCat VIII - 8th International Symposium on Carbon for Catalysis | pt_PT |
| person.familyName | Gomes | |
| person.givenName | Helder | |
| person.identifier.ciencia-id | 6218-1E19-13EE | |
| person.identifier.orcid | 0000-0001-6898-2408 | |
| rcaap.rights | openAccess | pt_PT |
| rcaap.type | conferenceObject | pt_PT |
| relation.isAuthorOfPublication | 0eb96337-224a-4339-9918-334436fbbb99 | |
| relation.isAuthorOfPublication.latestForDiscovery | 0eb96337-224a-4339-9918-334436fbbb99 |