Fluorine adsorption on floating iron nanoparticles confined to gigaporous structure of large adsorbent water spheres

Registro completo de metadados
MetadadosDescriçãoIdioma
Autor(es): dc.creatorOliveira, Felipe Wallysson Ferreira de-
Autor(es): dc.creatorReis, Sérgio Carneiro dos-
Autor(es): dc.creatorRibeiro, Luciana Sampaio-
Autor(es): dc.creatorVelásquez, Leila Nunes Menegasse-
Autor(es): dc.creatorCotta, Alexandre Alberto Chaves-
Autor(es): dc.creatorSantos, Vera Lúcia dos-
Autor(es): dc.creatorGastelois, Pedro Lana-
Autor(es): dc.creatorArdisson, José Domingos-
Autor(es): dc.creatorSantos, Armindo-
Data de aceite: dc.date.accessioned2026-02-09T12:45:00Z-
Data de disponibilização: dc.date.available2026-02-09T12:45:00Z-
Data de envio: dc.date.issued2022-07-08-
Data de envio: dc.date.issued2022-07-08-
Data de envio: dc.date.issued2021-10-
Fonte completa do material: dc.identifierhttps://repositorio.ufla.br/handle/1/50531-
Fonte completa do material: dc.identifierhttps://www.sciencedirect.com/science/article/pii/S235218642100643X-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/capes/1167523-
Descrição: dc.descriptionEffective defluoridation of artesian well water can be performed with iron nanoparticles confined to expanded reticulated polymer network of polyvinyl alcohol (PVA) containing a high quantity of water. For this purpose, large (3433 ± 63 m) adsorbent water spheres, meaning spheres containing Fe2O3 (15.8 wt%)-PVA (8.2 wt%)-O (76.0 wt%), were manufactured (sol–gel process) and characterized (TG/DTA, XRD, MÖSSBAUER, SEM/EDS, BET, FTIR, and XPS). In the resulting spongy water spheres, gigapores (140,000 nm) were filled with loosely agglomerated and floating naked nanoparticles (<20 nm) of octahedral [Fe2O2(HO)8] and/or [Fe2O3(HO)6]0 complexes without prejudice to the chemical and mechanical (35.0 ± 0.4 kPa) stability of the nanostructured adsorbent. The built-in mesoporous and gigaporous structure provided good pore connectivity, which significantly reduced the adsorption rate limitation imposed by boundary-layer and intraparticle diffusion effects as well as it has enhanced the adsorptive capacity (from 77.9 to 204.9 mgF/g) of the referred adsorbent water spheres. XPS proved the chemical interaction mechanism in F–Fe–PVA–HO system. Fluoride chemisorption occurs on PVA (marginally; (-CH2CHF-), (-CH2CF2-), and (-CF2CF2-)) and Fe (predominantly; octahedral Fe2F5.7H2O complex) particles. Adsorbent water spheres can defluorinate natural waters in multiple adsorption cycles in fixed bed columns after fluorine desorption with NH4OH.-
Idioma: dc.languageen-
Direitos: dc.rightsrestrictAccess-
Palavras-chave: dc.subjectNanoadsorbents-
Palavras-chave: dc.subjectLarge hydrogel spheres-
Palavras-chave: dc.subjectSol-gel process-
Palavras-chave: dc.subjectDefluoridation-
Palavras-chave: dc.subjectWastewater treatment-
Título: dc.titleFluorine adsorption on floating iron nanoparticles confined to gigaporous structure of large adsorbent water spheres-
Tipo de arquivo: dc.typeArtigo-
Aparece nas coleções:Repositório Institucional da Universidade Federal de Lavras (RIUFLA)

Não existem arquivos associados a este item.