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http://hdl.handle.net/10773/37788
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DC Field | Value | Language |
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dc.contributor.author | Matos, Renata | pt_PT |
dc.contributor.author | Kuźniarska-Biernacka, Iwona | pt_PT |
dc.contributor.author | Rocha, Mariana | pt_PT |
dc.contributor.author | Belo, João H. | pt_PT |
dc.contributor.author | Araújo, João Pedro | pt_PT |
dc.contributor.author | Estrada, Ana C. | pt_PT |
dc.contributor.author | Lopes, Joana L. | pt_PT |
dc.contributor.author | Shah, Tushti | pt_PT |
dc.contributor.author | Korgel, Brian A. | pt_PT |
dc.contributor.author | Pereira, Clara | pt_PT |
dc.contributor.author | Trindade, Tito | pt_PT |
dc.contributor.author | Freire, Cristina | pt_PT |
dc.date.accessioned | 2023-05-19T09:54:57Z | - |
dc.date.available | 2023-05-19T09:54:57Z | - |
dc.date.issued | 2023-06-01 | - |
dc.identifier.issn | 0920-5861 | pt_PT |
dc.identifier.uri | http://hdl.handle.net/10773/37788 | - |
dc.description.abstract | This study describes nanocomposites of graphene flakes (GF) combined with CuS, Fe3O4 and CuS−Fe3O4 nanoparticles prepared by wet chemical methods. The Fe3O4 and/or CuS nanoparticles were directly anchored onto GF without requiring additional chemical treatment. The composition, structure and morphology of the nanocomposites, as well as of the pristine GF and metal oxide/sulfide nanoparticles were characterised by X − ray photoelectron spectroscopy (XPS), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), powder X − ray diffraction (XRD) and scanning electron microscopy (SEM) techniques. The results confirmed the successful attachment of CuS nanophases (size range: 23.7–50.1 nm) and/or Fe3O4 nanoparticles (size range: 10.6–15.8 nm). The adsorption and photocatalytic properties of the GF−based nanocomposites were evaluated at room temperature using Rhodamine B (RhB) as a model contaminant. Theoretical models were fitted to the adsorption kinetic results using the pseudo-first-order, pseudo-second-order and Elovich equations, while the adsorption mechanism was determined using the intraparticle diffusion, Bangham and Boyd models. The RhB adsorption efficiency was 6.5% for GF@CuS−Fe3O4 after 180 min contact time, whereas for the other materials was significantly higher: 97.6%, 60.9% and 31.9% for GF, GF@CuS and GF@Fe3O4, respectively. The adsorption capacity of GF and composites fitted the pseudo−second−order kinetic and Elovich models. The influence of the nanostructures composition on the corresponding photocatalytic activity in the degradation of RhB under a 150 W halogen lamp was also evaluated. The GF@CuS−Fe3O4 nanocomposite totally eliminated the dissolved RhB after 60 min irradiation, whereas the GF@CuS, GF@Fe3O4 and pristine Fe3O4 removed 75.6%, 80.9% and 30.8%, respectively, after 180 min irradiation. It was found that the photocatalytic behaviour of the composites was best described by the first−order kinetic model. The rate constant of the photocatalytic RhB removal for GF@CuS−Fe3O4 (k = 7.05 ×10−2 min−1) was 2.1, 5.1 and 15.0 times higher than those obtained for GF@CuS, GF@Fe3O4 and pristine Fe3O4, respectively, after 60 min of visible light irradiation. | pt_PT |
dc.language.iso | eng | pt_PT |
dc.publisher | Elsevier | pt_PT |
dc.relation | H2020-FETOPEN-2018-2019-2020-01 | pt_PT |
dc.relation | 2021.04120. CEECIND/CP1662/CT0008 | pt_PT |
dc.relation | F-1464 | pt_PT |
dc.relation | DMR-1720595 | pt_PT |
dc.relation | info:eu-repo/grantAgreement/FCT/3599-PPCDT/PTDC%2FEME-TED%2F3099%2F2020/PT | pt_PT |
dc.relation | CERN/FISTEC/0003/2019 | pt_PT |
dc.relation | info:eu-repo/grantAgreement/FCT/DL 57%2F2016/DL57%2F2016%2FCP1334%2FCP1644%2FCT0001/PT | pt_PT |
dc.relation | SFRH-BPD-87430/2012 | pt_PT |
dc.relation | REQUIMTE/EEC2018/14 | pt_PT |
dc.relation | info:eu-repo/grantAgreement/FCT/POR_CENTRO/SFRH%2FBD%2F126241%2F2016/PT | pt_PT |
dc.rights | openAccess | pt_PT |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | pt_PT |
dc.subject | Graphene flakes | pt_PT |
dc.subject | Graphene hybrid nanostructures | pt_PT |
dc.subject | Iron oxide nanoparticles | pt_PT |
dc.subject | Copper sulfide nanocrystals | pt_PT |
dc.subject | Rhodamine B | pt_PT |
dc.subject | Photocatalysis | pt_PT |
dc.subject | Adsorption | pt_PT |
dc.title | Design and photo-Fenton performance of Graphene/CuS/Fe3O4 tertiary nanocomposites for Rhodamine B degradation | pt_PT |
dc.type | article | pt_PT |
dc.description.version | published | pt_PT |
dc.peerreviewed | yes | pt_PT |
degois.publication.title | Catalysis Today | pt_PT |
degois.publication.volume | 418 | pt_PT |
dc.identifier.doi | 10.1016/j.cattod.2023.114132 | pt_PT |
dc.identifier.essn | 1873-4308 | pt_PT |
dc.identifier.articlenumber | 114132 | pt_PT |
Appears in Collections: | CICECO - Artigos DQ - Artigos |
Files in This Item:
File | Description | Size | Format | |
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Design-and-photo-Fenton-performance-of-Graphene-CuS-Fe3O4-tert_2023_Catalysi.pdf | 3.79 MB | Adobe PDF | View/Open |
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