The increase of surface area of a Brazilian palygorskite clay activated with sulfuric acid solutions using a factorial design

Oliveira, Renata Nunes; Acchar, Wilson; Soares, Gloria Dulce de Almeida; Barreto, Ledjane Silva

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Campo DC	Valor	Idioma
dc.contributor.author	Oliveira, Renata Nunes	-
dc.contributor.author	Acchar, Wilson	-
dc.contributor.author	Soares, Gloria Dulce de Almeida	-
dc.contributor.author	Barreto, Ledjane Silva	-
dc.date.accessioned	2025-12-08T20:22:45Z	-
dc.date.available	2025-12-08T20:22:45Z	-
dc.date.issued	2013-08	-
dc.identifier.citation	OLIVEIRA, 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, ago. 2013. Disponível em: https://www.scielo.br/j/mr/a/nTvdLNGNrcbk4S6F4xq66Nn/?lang=en. Acesso em: 08 dez. 2025.	pt_BR
dc.identifier.issn	1980-5373	-
dc.identifier.uri	https://ri.ufs.br/jspui/handle/riufs/24022	-
dc.language	eng	pt_BR
dc.publisher	Associação Brasileira de Metalurgia, Materiais e Mineração (ABM) / Associação Brasileira de Cerâmica (ABC) / Associação Brasileira de Polímeros (ABPol)	pt_BR
dc.relation.ispartof	Materials Research	pt_BR
dc.subject	Palygorskite	eng
dc.subject	Acid activation	eng
dc.subject	Sulfuric acid	eng
dc.subject	Factorial design	eng
dc.title	The increase of surface area of a Brazilian palygorskite clay activated with sulfuric acid solutions using a factorial design	pt_BR
dc.type	Artigo	pt_BR
dc.identifier.license	Creative Commons Atribuição-NãoComercial 4.0 Internacional (CC BY-NC 4.0)	pt_BR
dc.description.resumo	Palygorskite 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.local	São Carlos, SP	pt_BR
Aparece nas coleções:	P2CEM - Artigos de periódicos

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