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TiO2-rGO nanocomposite as an efficient catalyst to photodegrade formalin in aquaculture's waters, under solar light

2020-04Journal article Restricted access
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dc.contributor.authorLeal, Joana F.
dc.contributor.authorCruz, Sandra M. A.
dc.contributor.authorAlmeida, Bernardo T. A.
dc.contributor.authorEsteves, Valdemar, I
dc.contributor.authorMarques, Paula A. A. P.
dc.contributor.authorSantos, Eduarda B. H.
dc.date.accessioned2021-06-24T11:35:47Z
dc.date.available2021-06-24T11:35:47Z
dc.date.issued2020-04
dc.description.abstractFormalin or hydrate of formaldehyde, a common disinfectant used in aquaculture, is not able to absorb sunlight, therefore its photodegradation must be catalyzed. To take advantage of sunlight for its photodegradation, TiO2-reduced graphene oxide (TiO2-rGO) nanocomposites with different GO contents (0.25-3.0 wt%) were synthesized and characterized by scanning electron microscopy (SEM), UV-vis and ATR-FTIR spectroscopies. Additionally, their specific surface areas (S-BET), pore volume and size were determined. The photocatalysts efficiency for formaldehyde (FM) degradation under simulated sunlight was assessed in aqueous solution. Among the nanocomposites considered, TiO2-rGO 0.5 wt% was the most efficient, achieving 93.8 +/- 4.6% of FM photodegradation in 90 min. The same irradiation conditions were applied in natural water matrices (aquaculture's freshwater and saltwater) to evaluate the influence of natural water constituents on photocatalysis. The photodegradation percentages obtained were 63.7 +/- 0.6% and 16.0 +/- 1.4% in aquaculture's freshwater and saltwater, respectively. This lower efficiency to photodegrade FM in natural aqueous matrices is attributed to the inhibition of photocatalytic oxidation of organic compounds caused by dissolved organic matter (DOM) and inorganic ions existing in the aquatic environment. Nevertheless, the results obtained for photocatalytic efficiency in natural waters are promising, suggesting a great potential of application in green photocatalysis to remove FM from contaminated freshwater.
dc.description.sponsorshipFCT/MCTESPortuguese Foundation for Science and TechnologyEuropean Commission [UID/AMB/50017/2019, UID/EMS/00481/2019, CENTRO-01-0145-FEDER-022083]
dc.description.sponsorshipFCT/MCTES through national funds (PIDDAC)
dc.description.sponsorshipFEDEREuropean Commission [CENTRO-01-0145-FEDER-030513]
dc.description.sponsorshipNational Foundation for Science and Technology (FCT)Portuguese Foundation for Science and Technology [SFRH/BD/88572/2012]
dc.description.sponsorshipFCT/MEC through national funds [PTDC/NAN-MAT/30513/2017]
dc.description.sponsorshipBosch Termotecnologia S.A. [POCI-01-0247 FEDER-007678]
dc.description.sponsorshipUniversity of AveiroEuropean Commission [POCI-01-0247 FEDER-007678]
dc.description.sponsorshipPortugal 2020, under the Competitiveness and Internationalization Operational Program
dc.description.sponsorshipEuropean Regional Development FundEuropean Commission
dc.description.versioninfo:eu-repo/semantics/publishedVersion
dc.identifier.doi10.1039/c9ew00950g
dc.identifier.issn2053-1400
dc.identifier.urihttp://hdl.handle.net/10400.1/16533
dc.language.isoeng
dc.peerreviewedyes
dc.publisherRoyal Society of Chemistry
dc.subject.otherEngineering; Environmental Sciences & Ecology; Water Resources
dc.titleTiO2-rGO nanocomposite as an efficient catalyst to photodegrade formalin in aquaculture's waters, under solar light
dc.typejournal article
dspace.entity.typePublication
oaire.awardURIinfo:eu-repo/grantAgreement/FCT/SFRH/SFRH%2FBD%2F88572%2F2012/PT
oaire.citation.endPage1027
oaire.citation.issue4
oaire.citation.startPage1018
oaire.citation.titleEnvironmental Science-Water Research & Technology
oaire.citation.volume6
oaire.fundingStreamSFRH
person.familyNameLeal
person.givenNameJoana F.
person.identifier.ciencia-id7816-76B3-F5F5
person.identifier.orcid0000-0002-0336-346X
person.identifier.ridAAD-1990-2019
person.identifier.scopus-author-id35096256100
project.funder.identifierhttp://doi.org/10.13039/501100001871
project.funder.nameFundação para a Ciência e a Tecnologia
rcaap.rightsrestrictedAccess
rcaap.typearticle
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