The increase of surface area of a Brazilian palygorskite clay activated with sulfuric acid solutions using a factorial design
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 th...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
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Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)
2013-05-01
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| Series: | Materials Research |
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| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392013000400031&tlng=en |
| _version_ | 1798020288187727872 |
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| author | R. N. Oliveira W. Acchar G. D. A. Soares L. S. Barreto |
| author_facet | R. N. Oliveira W. Acchar G. D. A. Soares L. S. Barreto |
| author_sort | R. N. Oliveira |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-11T16:55:08Z |
| format | Article |
| id | doaj.art-2d280f133b1b4a97800ac2b36dfeceef |
| institution | Directory Open Access Journal |
| issn | 1516-1439 |
| language | English |
| last_indexed | 2024-04-11T16:55:08Z |
| publishDate | 2013-05-01 |
| publisher | Associação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol) |
| record_format | Article |
| series | Materials Research |
| spelling | doaj.art-2d280f133b1b4a97800ac2b36dfeceef2022-12-22T04:13:17ZengAssociação Brasileira de Metalurgia e Materiais (ABM); Associação Brasileira de Cerâmica (ABC); Associação Brasileira de Polímeros (ABPol)Materials Research1516-14392013-05-01164924928The increase of surface area of a Brazilian palygorskite clay activated with sulfuric acid solutions using a factorial designR. N. Oliveira0W. Acchar1G. D. A. Soares2L. S. Barreto3Federal University of Rio de JaneiroFederal University of Rio Grande do NorteFederal University of Rio de JaneiroFederal University of SergipePalygorskite 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.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392013000400031&tlng=enpalygorskiteacid activationsulfuric acidfactorial design |
| spellingShingle | R. N. Oliveira W. Acchar G. D. A. Soares L. S. Barreto The increase of surface area of a Brazilian palygorskite clay activated with sulfuric acid solutions using a factorial design Materials Research palygorskite acid activation sulfuric acid factorial design |
| title | The increase of surface area of a Brazilian palygorskite clay activated with sulfuric acid solutions using a factorial design |
| title_full | The increase of surface area of a Brazilian palygorskite clay activated with sulfuric acid solutions using a factorial design |
| title_fullStr | The increase of surface area of a Brazilian palygorskite clay activated with sulfuric acid solutions using a factorial design |
| title_full_unstemmed | The increase of surface area of a Brazilian palygorskite clay activated with sulfuric acid solutions using a factorial design |
| title_short | The increase of surface area of a Brazilian palygorskite clay activated with sulfuric acid solutions using a factorial design |
| title_sort | increase of surface area of a brazilian palygorskite clay activated with sulfuric acid solutions using a factorial design |
| topic | palygorskite acid activation sulfuric acid factorial design |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-14392013000400031&tlng=en |
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