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  4. P2CEM - Artigos de periódicos
Please use this identifier to cite or link to this item: https://ri.ufs.br/jspui/handle/riufs/24022
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dc.contributor.authorOliveira, Renata Nunes-
dc.contributor.authorAcchar, Wilson-
dc.contributor.authorSoares, Gloria Dulce de Almeida-
dc.contributor.authorBarreto, Ledjane Silva-
dc.date.accessioned2025-12-08T20:22:45Z-
dc.date.available2025-12-08T20:22:45Z-
dc.date.issued2013-
dc.identifier.citationOLIVEIRA, R. N. et al. The increase of surface area of a Brazilian palygorskite clay activated with sulfuric acid solutions using a factorial design. Materials Research, São Carlos, v. 16, n. 4, p. 924-928, 2013. Disponível em: https://www.scielo.br/j/mr/a/nTvdLNGNrcbk4S6F4xq66Nn/?lang=en. Acesso em: 08 dez. 2025.pt_BR
dc.identifier.issn1980-5373-
dc.identifier.urihttps://ri.ufs.br/jspui/handle/riufs/24022-
dc.languageengpt_BR
dc.publisherAssociação Brasileira de Metalurgia, Materiais e Mineração (ABM) / Associação Brasileira de Cerâmica (ABC) / Associação Brasileira de Polímeros (ABPol)pt_BR
dc.relation.ispartofMaterials Researchpt_BR
dc.subjectPalygorskiteeng
dc.subjectAcid activationeng
dc.subjectSulfuric acideng
dc.subjectFactorial designeng
dc.titleThe increase of surface area of a Brazilian palygorskite clay activated with sulfuric acid solutions using a factorial designpt_BR
dc.typeArtigopt_BR
dc.identifier.licenseCreative Commons Atribuição-NãoComercial 4.0 Internacional (CC BY-NC 4.0)pt_BR
dc.description.resumoPalygorskite is fibrous clay in which the structural tetrahedral and octahedral layers are organized in a way that structural channels are formed, leading to high surface area. However, impurities inside the channels and aggregated ones considerably reduce the available area. In order to increase the surface area, an activation treatment can be considered useful. The goal of this work is the activation of palygorskite from Guadalupe, Piauí, via sulfuric acid treatment using a two-level factorial design. The influence of three parameters (solution molarity, temperature and time) on BET surface area was determined. Moreover, samples were characterized via X-ray diffraction (XRD) and fluorescence (XRF), Fourier-transform infrared spectroscopy (FTIR) and transmission electron microscopy (TEM). The largest surface area (282 m2/g) without considerable changes in clay structure and morphology was found in a sample treated with 5M H2SO4 at 70°C for 1h. The main parameters that favored the improvement of the surface area were the solution’s molarity, temperature and their interaction.pt_BR
dc.description.localSão Carlospt_BR
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