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Registro Completo |
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Biblioteca(s): |
Embrapa Pecuária Sudeste. |
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Data corrente: |
01/07/2010 |
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Data da última atualização: |
18/05/2021 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
SOARES, F. S. C.; BERNARDI, A. C. de C.; NOGUEIRA, A. R. de A. |
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Afiliação: |
UFSCar-SAO CARLOS, SP; ALBERTO CARLOS DE CAMPOS BERNARDI, CPPSE; ANA RITA DE ARAUJO NOGUEIRA, CPPSE. |
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Título: |
Characterization of three natural zeolites. |
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Ano de publicação: |
2010 |
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Fonte/Imprenta: |
In: INTERNATIONAL CONFERENCE ON FOOD AND AGRICULTURE APPLICATIONS OF NANOTECHNOLOGIES, 2010, São pedro, São Pedro: Aptor Software, 2010. |
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Páginas: |
p. 179 |
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Idioma: |
Português |
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Conteúdo: |
In recent years, great attention has been paid to the application of nano structure materials. Since zeolites have primary particles with at least one dimension in the nanometer scale, they may be regarded as nanomaterials of geological and pedological origins. Zeolites are hydrated aluminosilicates, crystalline, with a wide variety of technological applications. Its structure consists of a skeleton with three-dimensional tetrahedral of AlO4 and SiO4, linked via oxygen atoms, and having channels and cavities in which it is possible to settle ions, water molecules or other adsorbates and salts. The Si and Al are at the center of the tetrahedron, the structural frame includes cavities occupied by relatively large sizes cations (Na+, K+, Ca2+, Mg2+) and water molecules, both having considerable freedom of movement, allowing ion exchange and reversible dehydration. High degree of hydration, low density, stability of the crystal structure, cation exchange properties, electrical conductivity, adsorption of gases and catalytic properties are the main properties of zeolites. About forty species of natural zeolites have been identified and over one hundred and fifty species have been synthesized. The synthetic zeolites have a high degree of purity and are widely used as catalysts for the petrochemical industry. In contrast, natural zeolites, have lower purity, and are easily found on the market, being used for a wide range of purposes. Treatment of industrial effluents, waste water purification, treatment of saline soils and supplementation in the diet of animals are examples of applications of commercial products made from natural zeolites derived from mines located in different regions of the world. Due to their technological applications and physicochemical properties, zeolites have been investigated owing their mineral identification and characterization. Aiming to obtaining the physical and chemical properties, three samples of natural zeolites were evaluated. Their main composition were respectively heulandites/clinoptilolite; clinoptilolite; and stilbite. For this purpose, we determined the particle size distribution, degree of hydration, the superficial area, by BET method, the assessment of the crystalline state by using micrography, the analysis of mineralogical composition by X-rays diffraction technique, and the chemical composition of natural zeolites by using inductively coupled plasma optical spectrometry. MenosIn recent years, great attention has been paid to the application of nano structure materials. Since zeolites have primary particles with at least one dimension in the nanometer scale, they may be regarded as nanomaterials of geological and pedological origins. Zeolites are hydrated aluminosilicates, crystalline, with a wide variety of technological applications. Its structure consists of a skeleton with three-dimensional tetrahedral of AlO4 and SiO4, linked via oxygen atoms, and having channels and cavities in which it is possible to settle ions, water molecules or other adsorbates and salts. The Si and Al are at the center of the tetrahedron, the structural frame includes cavities occupied by relatively large sizes cations (Na+, K+, Ca2+, Mg2+) and water molecules, both having considerable freedom of movement, allowing ion exchange and reversible dehydration. High degree of hydration, low density, stability of the crystal structure, cation exchange properties, electrical conductivity, adsorption of gases and catalytic properties are the main properties of zeolites. About forty species of natural zeolites have been identified and over one hundred and fifty species have been synthesized. The synthetic zeolites have a high degree of purity and are widely used as catalysts for the petrochemical industry. In contrast, natural zeolites, have lower purity, and are easily found on the market, being used for a wide range of purposes. Treatment of industrial effluents, waste water p... Mostrar Tudo |
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Palavras-Chave: |
Fonte natural; Zeolita. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/37810/1/PROCI-2010.00009.pdf
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Marc: |
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Registro original: |
Embrapa Pecuária Sudeste (CPPSE) |
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| 62. |  | BICUDO, J. C.; DIAS, M.; FERREIRA, A.; SOUZA, G. B. de; NOGUEIRA, A. R. de A. Avaliação da repetibilidade e reprodutibilidade de um espectrômetro de infravermelho próximo portátil. In: JORNADA CIENTÍFICA - EMBRAPA SÃO CARLOS, 6., 2014, São Carlos, SP. Anais... São Carlos: Embrapa Instrumentação: Embrapa Pecuária Sudeste, 2014. p. 89| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 64. | | VERHALEN, T. R.; SILVA, C. S. da; SOUZA, G. B. de; NOGUEIRA, A. R. de A. Avaliação de parâmetros para o preparo de materiais de referência. In: JORNADA CIENTÍFICA - EMBRAPA SÃO CARLOS, 5., 2013, São Carlos, SP. Anais... São Carlos, SP: Embrapa Pecuária Sudeste: Embrapa Instrumentação , 2013. p. 42 Editado por Ana Rita de Araújo; Simone Cristina Méo Nicura.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 66. | | DIAS, M.; DEL SANTO, V. R.; SOUZA, G. B. de; NOGUEIRA, A. R. de A. Avaliação de amostras destinadas a programa interlaboratorial por meio da espectroscopia de reflectância no infravermelho próximo (NIR´s). In: JORNADA CIENTÍFICA - EMBRAPA SÃO CARLOS, 4., 2012, São Carlos, SP. Anais... São Carlos: Embrapa Instrumentação: Embrapa Pecuária Sudeste, 2012. p. 97. (Embrapa Instrumentação. Documentos, 56).| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 69. | | PARRA, A.; LEMOS, S. G.; NOGUEIRA, A. R. de A.; TORRE NETO, A.; ALONSO, J. ATP determination using a flow injection potentiometric cobalt electrode. In: RENCONTRE TRANSFRONTALIÈRE CAPTEURS ET BIOCAPTEURS, 8., 2003, Ceret, FR: Université de Perpignan, 2003.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 70. | | BRONDI, S. H. G.; MACEDO, A. N.; NOGUEIRA, A. R. de A. Application of QuECHERS method and gas chromatography-mass spectrometry for the analysis of cypermethrin, fipronil and chlorfenvinphos residues in cattle´s milk, meat and fat. In: SIMPÓSIO EMBRAPA LABEX EUA DE SANIDADE ANIMAL, 2., 2012, Brasília, DF. Anais... Brasília: Embrapa Estudos e Capacitação, 2012. p.177-178| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 71. | | TREVISAN, L. C.; NOGUEIRA, A. R. de A.; NÓBREGA, J. A. Acid vapor partial digestion of biological samples in a focused microwave: multielement determination by ICP OES with axially-viewed configuration. In: RIO SYMPOSIUM ON ATOMIC SPECTROMETRY, 7., 2002, Florianópolis, SC. ICP Information Newsletter, v.28, n.1, june 2002. p.136. Tu34.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| 73. | | GARCIA, E. E.; PEREIRA, C. D.; NOGUEIRA, A. R. de A.; NÓBREGA, J. A. Avaliação da correção de sinais de fundo causados pelos íons diatômicos Ar2 + e CN+ em ICP-MS com interface CRI. In: ENCONTRO NACIONAL DE QUÍMICA ANALÍTICA, 15.; CONGRESSO IBEROAMERICANO DE QUÍMICA ANALÍTICA, 3., 2009, Salvador, BA. Anais... Salvador: SBQ: UFBA, 2009.| Tipo: Resumo em Anais de Congresso |
| Biblioteca(s): Embrapa Pecuária Sudeste. |
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| Registros recuperados : 705 | |
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