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Registro Completo |
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Biblioteca(s): |
Embrapa Agrobiologia; Embrapa Amapá; Embrapa Amazônia Ocidental; Embrapa Amazônia Oriental; Embrapa Florestas; Embrapa Rondônia; Embrapa Roraima; Embrapa Semiárido; Embrapa Unidades Centrais. |
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Data corrente: |
05/06/2003 |
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Data da última atualização: |
21/07/2014 |
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Tipo da produção científica: |
Circular Técnica |
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Autoria: |
CARVALHO, P. E. R. |
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Afiliação: |
Pesquisador da Embrapa Florestas. |
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Título: |
Canafístula. |
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Ano de publicação: |
2002 |
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Fonte/Imprenta: |
Colombo: Embrapa Florestas, 2002. |
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Páginas: |
15 p. |
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Série: |
(Embrapa Florestas. Circular Técnica, 64). |
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ISSN: |
1517-5278 |
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Idioma: |
Português |
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Conteúdo: |
Taxonomia. Descrição. Biologia reprodutiva e fenologia. Ocorrência natural. Aspectos ecológicos. Clima. Solos e nutrição. Sementes. Produção de mudas. Características silviculturais. Melhoramento e conservação dos recursos genéticos. Crescimento e produção. Características da madeira. Outras características. Produtos e utilizações. Madeira serrada e roliça. Energia. Celulose e papel. Outros produtos. Carboidratos. Constituintes químicos. Substâncias tanantes. Outros usos. Alimentação animal. Apícola. Medicinal. Paisagístico. Reflorestamento para recuperação ambiental. Principais pragas. Espécies afins. |
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Palavras-Chave: |
Aspectos Agronômicos; Brasil; Descrição; Espécie florestal; Indigenous organisms; Mudas; Peltrophorum dubium; Produção de muda; Uso; Usos. |
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Thesagro: |
Árvore; Árvore Angiosperma; Botânica; Canafístula; Espécie Nativa; Essência Florestal; Identificação; Madeira; Muda; Nutrição; Peltophorum Dubium; Praga de Planta; Recurso Genético; Semente; Silvicultura; Solo; Taxonomia. |
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Categoria do assunto: |
-- |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/42007/1/CT0064.pdf
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Marc: |
LEADER 01781nam a2200469 a 4500
001 1306466
005 2014-07-21
008 2002 bl uuuu u0uu1 u #d
022 $a1517-5278
100 1 $aCARVALHO, P. E. R.
245 $aCanafístula.
260 $aColombo: Embrapa Florestas$c2002
300 $a15 p.
490 $a(Embrapa Florestas. Circular Técnica, 64).
520 $aTaxonomia. Descrição. Biologia reprodutiva e fenologia. Ocorrência natural. Aspectos ecológicos. Clima. Solos e nutrição. Sementes. Produção de mudas. Características silviculturais. Melhoramento e conservação dos recursos genéticos. Crescimento e produção. Características da madeira. Outras características. Produtos e utilizações. Madeira serrada e roliça. Energia. Celulose e papel. Outros produtos. Carboidratos. Constituintes químicos. Substâncias tanantes. Outros usos. Alimentação animal. Apícola. Medicinal. Paisagístico. Reflorestamento para recuperação ambiental. Principais pragas. Espécies afins.
650 $aÁrvore
650 $aÁrvore Angiosperma
650 $aBotânica
650 $aCanafístula
650 $aEspécie Nativa
650 $aEssência Florestal
650 $aIdentificação
650 $aMadeira
650 $aMuda
650 $aNutrição
650 $aPeltophorum Dubium
650 $aPraga de Planta
650 $aRecurso Genético
650 $aSemente
650 $aSilvicultura
650 $aSolo
650 $aTaxonomia
653 $aAspectos Agronômicos
653 $aBrasil
653 $aDescrição
653 $aEspécie florestal
653 $aIndigenous organisms
653 $aMudas
653 $aPeltrophorum dubium
653 $aProdução de muda
653 $aUso
653 $aUsos
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Registro original: |
Embrapa Florestas (CNPF) |
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Registro Completo
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Biblioteca(s): |
Embrapa Meio Ambiente. |
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Data corrente: |
05/04/2017 |
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Data da última atualização: |
29/06/2017 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
COA, F.; CLEMENTE, Z.; LOPES, J. R.; RODRIGUES NETO, L. L.; ALVES, O. L.; CASTRO, V. L. S. S. de; BARBIERI, E.; MARTINEZ, D. S. T. |
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Afiliação: |
F. COA, CNPEM; Z. CLEMENTE, Bolsista; J. R. LOPES, CNPEM; L. L. RODRIGUES NETO, Unicamp; O. L. ALVES, Unicamp; VERA LUCIA SCHERHOLZ S DE CASTRO, CNPMA; E. BARBIERI, Instituto de Pesca; D. S. T. MARTINEZ, CNPEM. |
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Título: |
Green mecanochemical process for carbon nanotubes coating with humic acid: application and ecotoxicity evaluation. |
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Ano de publicação: |
2016 |
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Fonte/Imprenta: |
In: ENCONTRO ANUAL DA SOCIEDADE BRASILEIRA DE PESQUISA EM MATERIAIS, 15., 2016, Campinas. [Abstracts...] Rio de Janeiro: Sociedade Brasileira de Pesquisas em Materiais, 2016. Resumo B6SZ. |
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Idioma: |
Inglês |
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Conteúdo: |
Nanomaterials (NM) are promising for environmental remediation due to their unreleased properties such as high surface area and reactivity. Chemical oxidations (H2SO4/HNO3) have been applied to carbon NM in order to favor their application, but these are expensive and hazardous. In this work, industrial grade multiwalled carbon nanotubes (raw-MWCNT) were coated with humic acid (HA) by a ball milling processing (solid state). The aim was to apply a green mechanochemical process to improve the colloidal stability of MWCNTs and their removal capacity of metals. The HA-MWCNT complex was studied by atomic force microscope (AFM), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), dynamic light scattering (DLS), electrophoretic light scattering (ELS) and ultraviolet-visible spectroscopy (UV-Vis). Cu2+ sorption from water by HA-MWCNT, MWCNT-COOH and milledMWCNT were compared. Acute bioassays (96h) were performed with Daphnia magna exposed to 0.0; 0.1; 1.0; 5.0 and 10.0 mg/L of HA-MWCNT. Our results showed that the coating process enhanced the zeta potential of raw-MWCNT of -25.4±0.2 mV to -37.4±0.7 mV and reduced their hydrodynamic diameter of 393.2±27.3 nm to 212.5±5.6 nm in ultrapure water. AFM images of HA-MWCNT showed that it has an irregular surface, due to the humic acid coating. The complex was 4 times (84±1.8%) more efficient to remove Cu2+ than MWCNTCOOH (20.0±1.4%) and 11 times compared to milled-MWCNT (7.6±3.1%). The increases in Oxygen and the reductions in Carbon on surface of HA-MWCNT relative to raw-MWCNT and milled-MWCNT indicated the introduction of functional oxygenated groups on MWCNT. The HA-MWCNT did not show acute toxicity against D. magna. These results suggest that the coating changes the MWCNT surface, resulting in a material with potential to metal remediation, prepared without oxidizing acids and that did not show toxicity on D. magna. MenosNanomaterials (NM) are promising for environmental remediation due to their unreleased properties such as high surface area and reactivity. Chemical oxidations (H2SO4/HNO3) have been applied to carbon NM in order to favor their application, but these are expensive and hazardous. In this work, industrial grade multiwalled carbon nanotubes (raw-MWCNT) were coated with humic acid (HA) by a ball milling processing (solid state). The aim was to apply a green mechanochemical process to improve the colloidal stability of MWCNTs and their removal capacity of metals. The HA-MWCNT complex was studied by atomic force microscope (AFM), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), dynamic light scattering (DLS), electrophoretic light scattering (ELS) and ultraviolet-visible spectroscopy (UV-Vis). Cu2+ sorption from water by HA-MWCNT, MWCNT-COOH and milledMWCNT were compared. Acute bioassays (96h) were performed with Daphnia magna exposed to 0.0; 0.1; 1.0; 5.0 and 10.0 mg/L of HA-MWCNT. Our results showed that the coating process enhanced the zeta potential of raw-MWCNT of -25.4±0.2 mV to -37.4±0.7 mV and reduced their hydrodynamic diameter of 393.2±27.3 nm to 212.5±5.6 nm in ultrapure water. AFM images of HA-MWCNT showed that it has an irregular surface, due to the humic acid coating. The complex was 4 times (84±1.8%) more efficient to remove Cu2+ than MWCNTCOOH (20.0±1.4%) and 11 times compared to milled-MWCNT (7.6±3.1%). ... Mostrar Tudo |
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Palavras-Chave: |
Ecotoxicologia; Nantubes. |
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Categoria do assunto: |
W Química e Física |
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URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/161193/1/2016RA-040.pdf
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Marc: |
LEADER 02763nam a2200217 a 4500
001 2068138
005 2017-06-29
008 2016 bl uuuu u00u1 u #d
100 1 $aCOA, F.
245 $aGreen mecanochemical process for carbon nanotubes coating with humic acid$bapplication and ecotoxicity evaluation.$h[electronic resource]
260 $aIn: ENCONTRO ANUAL DA SOCIEDADE BRASILEIRA DE PESQUISA EM MATERIAIS, 15., 2016, Campinas. [Abstracts...] Rio de Janeiro: Sociedade Brasileira de Pesquisas em Materiais, 2016. Resumo B6SZ.$c2016
520 $aNanomaterials (NM) are promising for environmental remediation due to their unreleased properties such as high surface area and reactivity. Chemical oxidations (H2SO4/HNO3) have been applied to carbon NM in order to favor their application, but these are expensive and hazardous. In this work, industrial grade multiwalled carbon nanotubes (raw-MWCNT) were coated with humic acid (HA) by a ball milling processing (solid state). The aim was to apply a green mechanochemical process to improve the colloidal stability of MWCNTs and their removal capacity of metals. The HA-MWCNT complex was studied by atomic force microscope (AFM), scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS), thermogravimetric analysis (TGA), dynamic light scattering (DLS), electrophoretic light scattering (ELS) and ultraviolet-visible spectroscopy (UV-Vis). Cu2+ sorption from water by HA-MWCNT, MWCNT-COOH and milledMWCNT were compared. Acute bioassays (96h) were performed with Daphnia magna exposed to 0.0; 0.1; 1.0; 5.0 and 10.0 mg/L of HA-MWCNT. Our results showed that the coating process enhanced the zeta potential of raw-MWCNT of -25.4±0.2 mV to -37.4±0.7 mV and reduced their hydrodynamic diameter of 393.2±27.3 nm to 212.5±5.6 nm in ultrapure water. AFM images of HA-MWCNT showed that it has an irregular surface, due to the humic acid coating. The complex was 4 times (84±1.8%) more efficient to remove Cu2+ than MWCNTCOOH (20.0±1.4%) and 11 times compared to milled-MWCNT (7.6±3.1%). The increases in Oxygen and the reductions in Carbon on surface of HA-MWCNT relative to raw-MWCNT and milled-MWCNT indicated the introduction of functional oxygenated groups on MWCNT. The HA-MWCNT did not show acute toxicity against D. magna. These results suggest that the coating changes the MWCNT surface, resulting in a material with potential to metal remediation, prepared without oxidizing acids and that did not show toxicity on D. magna.
653 $aEcotoxicologia
653 $aNantubes
700 1 $aCLEMENTE, Z.
700 1 $aLOPES, J. R.
700 1 $aRODRIGUES NETO, L. L.
700 1 $aALVES, O. L.
700 1 $aCASTRO, V. L. S. S. de
700 1 $aBARBIERI, E.
700 1 $aMARTINEZ, D. S. T.
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Embrapa Meio Ambiente (CNPMA) |
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