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 | Acesso ao texto completo restrito à biblioteca da Embrapa Instrumentação. Para informações adicionais entre em contato com cnpdia.biblioteca@embrapa.br. |
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Registro Completo |
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Biblioteca(s): |
Embrapa Instrumentação. |
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Data corrente: |
06/04/2021 |
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Data da última atualização: |
10/06/2022 |
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Tipo da produção científica: |
Artigo em Periódico Indexado |
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Autoria: |
OLIVEIRA, A. M. S.; PARIS, E. C.; GIRALDI, T. R. |
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Afiliação: |
ELAINE CRISTINA PARIS, CNPDIA. |
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Título: |
GIS zeolite obtained by the microwave-hydrothermal method: Synthesis and evaluation of its adsorptive capacity. |
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Ano de publicação: |
2021 |
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Fonte/Imprenta: |
Materials Chemistry and Physics, v. 260, 124142, 2021. |
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Páginas: |
260?271 |
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ISSN: |
0254-0584 |
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DOI: |
https://doi.org/10.1016/j.matchemphys.2020.124142 R |
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Idioma: |
Inglês |
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Conteúdo: |
Developing synthetic routes that lead to the formation of zeolites with small porous systems, such as GIS zeolites, has attracted great interest since these structures have unique properties in catalysis and adsorption, but are still underused. In this study, GIS type zeolite nanoparticles were synthesized by the microwave-assisted hydrothermal method. Two synthesis routes were evaluated using two different silica precursor sources. Silicon dioxide was used in crystalline and amorphous forms. The material was characterized by X-ray diffraction (XRD), nitrogen physisorption, zeta potential (ZP), high-resolution scanning electron microscopy (SEM-FEG), highresolution transmission electron microscopy (HRTEM) and by energy dispersive X-ray spectroscopy (EDS). The obtained crystalline phase was the Na–P1 type zeolite (GIS structure). The BET surface area of the particles was 17 m2 /g and the average pore size was 4 nm. These zeolites were used for Mn(II) ions adsorption in aqueous medium. Considering the studied adsorption conditions, adsorption was higher at pH 8, using an adsorbent concentration of 1 g/L and with 30 min of contact time. The kinetic model that best described the process was the pseudo-second order model and the isotherm model that best fitted to the experimental data was the Langmuir model, which indicates adsorption in monolayers and high affinity between the adsorbate and the adsorbent. The maximum adsorption capacity was 44.05 mg/g. |
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Palavras-Chave: |
GIS zeolites; Manganese (II); Microwave synthesis. |
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Categoria do assunto: |
-- |
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Marc: |
LEADER 02169naa a2200217 a 4500
001 2131082
005 2022-06-10
008 2021 bl uuuu u00u1 u #d
022 $a0254-0584
024 7 $ahttps://doi.org/10.1016/j.matchemphys.2020.124142 R$2DOI
100 1 $aOLIVEIRA, A. M. S.
245 $aGIS zeolite obtained by the microwave-hydrothermal method$bSynthesis and evaluation of its adsorptive capacity.$h[electronic resource]
260 $c2021
300 $a260?271
520 $aDeveloping synthetic routes that lead to the formation of zeolites with small porous systems, such as GIS zeolites, has attracted great interest since these structures have unique properties in catalysis and adsorption, but are still underused. In this study, GIS type zeolite nanoparticles were synthesized by the microwave-assisted hydrothermal method. Two synthesis routes were evaluated using two different silica precursor sources. Silicon dioxide was used in crystalline and amorphous forms. The material was characterized by X-ray diffraction (XRD), nitrogen physisorption, zeta potential (ZP), high-resolution scanning electron microscopy (SEM-FEG), highresolution transmission electron microscopy (HRTEM) and by energy dispersive X-ray spectroscopy (EDS). The obtained crystalline phase was the Na–P1 type zeolite (GIS structure). The BET surface area of the particles was 17 m2 /g and the average pore size was 4 nm. These zeolites were used for Mn(II) ions adsorption in aqueous medium. Considering the studied adsorption conditions, adsorption was higher at pH 8, using an adsorbent concentration of 1 g/L and with 30 min of contact time. The kinetic model that best described the process was the pseudo-second order model and the isotherm model that best fitted to the experimental data was the Langmuir model, which indicates adsorption in monolayers and high affinity between the adsorbate and the adsorbent. The maximum adsorption capacity was 44.05 mg/g.
653 $aGIS zeolites
653 $aManganese (II)
653 $aMicrowave synthesis
700 1 $aPARIS, E. C.
700 1 $aGIRALDI, T. R.
773 $tMaterials Chemistry and Physics$gv. 260, 124142, 2021.
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Registro original: |
Embrapa Instrumentação (CNPDIA) |
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Biblioteca |
ID |
Origem |
Tipo/Formato |
Classificação |
Cutter |
Registro |
Volume |
Status |
URL |
Voltar
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Registro Completo
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Biblioteca(s): |
Embrapa Amapá. |
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Data corrente: |
26/01/1994 |
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Data da última atualização: |
06/10/2022 |
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Autoria: |
ALVES, R. N. B.; PEREIRA, L. A. F.; CAVALCANTE, E. da S.; FIGUEIREDO, F. J. C. |
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Afiliação: |
RAIMUNDO NONATO BRABO ALVES, CPAF-AP; LUIZ ALBERTO FREITAS PEREIRA, CPAF-AP; EMANUEL DA SILVA CAVALCANTE, CPAF-AP; FRANCISCO JOSE CAMARA FIGUEIREDO, CPAF-AP. |
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Título: |
Competição de cultivares de arroz de sequeiro em áreas de cerrado do Territorio Federal do Amapá. |
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Ano de publicação: |
1982 |
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Fonte/Imprenta: |
Macapá: EMBRAPA-UEPAT de Macapá, 1982. |
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Páginas: |
3 p. |
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Série: |
(EMBRAPA-UEPAT de Macapá. Pesquisa em andamento, 3). |
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Idioma: |
Português |
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Conteúdo: |
Selecionar cultivares de arroz, adaptaveis as condições edafo-climaticas dos cerrados amapaenses. |
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Palavras-Chave: |
Amapá; Brasil; Competição; Cultivar; Sequeiro; Upland rice. |
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Thesagro: |
Arroz; Arroz Sequeiro; Cerrado; Competição de Variedade; Oryza Sativa; Variedade. |
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Thesaurus NAL: |
Brazil; savannas; varieties. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/64976/1/AP-1982-competicao-cultivares-arroz-sequeiro.pdf
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Marc: |
LEADER 01044nam a2200349 a 4500
001 1341739
005 2022-10-06
008 1982 bl uuuu u0uu1 u #d
100 1 $aALVES, R. N. B.
245 $aCompetição de cultivares de arroz de sequeiro em áreas de cerrado do Territorio Federal do Amapá.
260 $aMacapá: EMBRAPA-UEPAT de Macapá$c1982
300 $a3 p.
490 $a(EMBRAPA-UEPAT de Macapá. Pesquisa em andamento, 3).
520 $aSelecionar cultivares de arroz, adaptaveis as condições edafo-climaticas dos cerrados amapaenses.
650 $aBrazil
650 $asavannas
650 $avarieties
650 $aArroz
650 $aArroz Sequeiro
650 $aCerrado
650 $aCompetição de Variedade
650 $aOryza Sativa
650 $aVariedade
653 $aAmapá
653 $aBrasil
653 $aCompetição
653 $aCultivar
653 $aSequeiro
653 $aUpland rice
700 1 $aPEREIRA, L. A. F.
700 1 $aCAVALCANTE, E. da S.
700 1 $aFIGUEIREDO, F. J. C.
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Embrapa Amapá (CPAF-AP) |
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