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Degradation of methylparaben by sonocatalysis using a Co–Fe magnetic carbon xerogel

2020Journal article Open access
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dc.contributor.authorZanias, Athanasios
dc.contributor.authorFrontistis, Zacharias
dc.contributor.authorVakros, John
dc.contributor.authorArvaniti, Olga S.
dc.contributor.authorRibeiro, Rui
dc.contributor.authorSilva, Adrián
dc.contributor.authorFaria, Joaquim
dc.contributor.authorGomes, Helder
dc.contributor.authorMantzavinos, Dionissios
dc.date.accessioned2018-02-19T10:00:00Z
dc.date.accessioned2020-06-22T10:18:16Z
dc.date.available2018-01-19T10:00:00Z
dc.date.available2020-06-22T10:18:16Z
dc.date.issued2020
dc.description.abstractThe degradation of methylparaben (MP) through 20 kHz ultrasound coupled with a bimetallic Co-Fe carbon xerogel (CX/CoFe) was investigated in this work. Experiments were performed at actual power densities of 25 and 52 W/L, catalyst loadings of 12.5 and 25 mg/L, MP concentrations between 1 and 4.2 mg/L and initial pH values between 3 and 10 in ultrapure water (UPW). Matrix effects were studied in bottled water (BW) and secondary treated wastewater (WW), as well as in UPW spiked with bicarbonate, chloride or humic acid. The pseudo–first order kinetics of MP degradation increase with power and catalyst loading and decrease with MP concentration and matrix complexity; moreover, the reaction is also favored at near–neutral conditions and in the presence of dissolved oxygen. The contribution of the catalyst is synergistic to the sonochemical degradation of MP and the extent of synergy is quantified to be>45%. This effect was ascribed to the ability of CX/CoFe to catalyze the dissociation of hydrogen peroxide, formed through water sonolysis, to hydroxyl radicals. Experiments in UPW spiked with an excess of tert-butanol (radical scavenger), sodium dodecyl sulfate or sodium acetate (surfactants) led to substantially decreased rates (i.e. by about 8 times), thus implying that the liquid bulk and the gas-liquid interface are major reaction sites. The stability of CX/CoFe was shown by performing reusability cycles employing magnetic separation of the catalyst after the treatment stage. It was found that the CX/CoFe catalyst can be reused in up to four successive cycles without noteworthy variation of the overall performance of the sonocatalytic process.
dc.description.sponsorshipThis work is a result of: 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 (NORTE2020), under the Portugal 2020 Partnership Agreement, through the European Regional Development Fund (ERDF); Project Associate Laboratory LSRE-LCM – UID/EQU/50020/2019 – funded by national funds through FCT/MCTES (PIDDAC).
dc.description.versioninfo:eu-repo/semantics/publishedVersionen_EN
dc.identifier.citationZanias, Athanasios; Frontistis, Zacharias; Vakros, John; Arvaniti, Olga S.; Ribeiro, Rui S.; Silva, Adrián M.T.; Faria, Joaquim L.; Gomes, Helder T.; Mantzavinos, Dionissios (2020). Degradation of methylparaben by sonocatalysis using a Co–Fe magnetic carbon xerogel. Ultrasonics Sonochemistry. ISSN 1350-4177. 64, p. 1-7en_EN
dc.identifier.doi10.1016/j.ultsonch.2020.105045en_EN
dc.identifier.issn1350-4177
dc.identifier.urihttp://hdl.handle.net/10198/19410
dc.language.isoeng
dc.peerreviewedyesen_EN
dc.relationLaboratory of Separation and Reaction Engineering
dc.subjectAdvanced oxidationen_EN
dc.subjectCavitationen_EN
dc.subjectLow frequency ultrasounden_EN
dc.subjectMicropollutantsen_EN
dc.subjectSonodegradationen_EN
dc.subjectWater qualityen_EN
dc.titleDegradation of methylparaben by sonocatalysis using a Co–Fe magnetic carbon xerogelen_EN
dc.typejournal article
dspace.entity.typePublication
oaire.awardTitleLaboratory of Separation and Reaction Engineering
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/6817 - DCRRNI ID/UID%2FEQU%2F50020%2F2019/PT
oaire.fundingStream6817 - DCRRNI ID
person.familyNameGomes
person.givenNameHelder
person.identifier.ciencia-id6218-1E19-13EE
person.identifier.orcid0000-0001-6898-2408
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsopenAccessen_EN
rcaap.typearticleen_EN
relation.isAuthorOfPublication0eb96337-224a-4339-9918-334436fbbb99
relation.isAuthorOfPublication.latestForDiscovery0eb96337-224a-4339-9918-334436fbbb99
relation.isProjectOfPublicatione06b75ec-de55-4ce1-987c-94f557ba6cb0
relation.isProjectOfPublication.latestForDiscoverye06b75ec-de55-4ce1-987c-94f557ba6cb0

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