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Registro Completo |
Biblioteca(s): |
Embrapa Meio Ambiente. |
Data corrente: |
05/04/2017 |
Data da última atualização: |
29/06/2017 |
Tipo da produção científica: |
Resumo em Anais de Congresso |
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. |
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. |
Título: |
Green mecanochemical process for carbon nanotubes coating with humic acid: application and ecotoxicity evaluation. |
Ano de publicação: |
2016 |
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. |
Idioma: |
Inglês |
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 |
Palavras-Chave: |
Ecotoxicologia; Nantubes. |
Categoria do assunto: |
W Química e Física |
URL: |
https://ainfo.cnptia.embrapa.br/digital/bitstream/item/161193/1/2016RA-040.pdf
|
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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Registros recuperados : 28 | |
3. | | CLEMENTE, Z.; MARTINEZ, D. S. T.; CASTRO, V. L. S. S. de. Perspectivas do uso do teste com embriões de zebrafish no âmbito da nanotoxicologia. Revista da Sociedade Brasileira de Ciências em Animais de Laboratório, São Paulo, v. 4, n. 1, p. 67, 2016. Edição dos anais do 14º Congresso da Sociedade Brasileira de Ciências em Animais de Laboratório e do 3º Encontro Latino Americano de Ciências em Animais de Laboratório, 2016, Porto Alegre. Pôster.Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Meio Ambiente. |
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5. | | MEDEIROS, A. M. Z.; SILVA, G. H. da; CASTRO, V. L. S. S. de; MARTINEZ, D. S. T. Efeitos diferentes na co-exposição de óxido de grafeno e ácido húmico em zebrafish: influência do córion. In: SIMPÓSIO CIENTÍFICO DOS PÓS-GRADUANDOS DO CENA, 10., 2017, Piracicaba. Novos tempos na pesquisa: transformação, liderança e inovação: resumos... Piracicaba, SP: CENA/USP, 2017.Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Meio Ambiente. |
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8. | | CASTRO, V. L. S. S. de; CLEMENTE, Z.; JONSSON, C. M.; SILVA, M. S. G. M. e; VALLIM, J. H.; MEDEIROS, A. M. Z.; MARTINEZ, D. S. T. Avaliação de risco ambiental estimado pela exposição ao óxido de grafeno. In: WORKSHOP DE NANOTECNOLOGIA APLICADA AO AGRONEGÓCIO, 9., 2017, São Carlos. Anais... São Carlos: Embrapa Instrumentação, 2017. p. 651-654.Tipo: Artigo em Anais de Congresso |
Biblioteca(s): Embrapa Meio Ambiente. |
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10. | | GONÇALVES, S. P. C.; STRAUSS, M.; DELITE, F. S.; CLEMENTE, Z.; CASTRO, V. L. S. S. de; MARTINEZ, D. S. T. Avaliação da ecotoxicidade do carvão ativo modificado com nanopartícula de prata. In: SIMPÓSIO DE ECOTOXICOLOGIA, 3., 2016, Rio Claro. Anais... Rio Claro: Unesp, 2016. p. 89.Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Meio Ambiente. |
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11. | | CLEMENTE, Z.; SILVA, G. H. da; NUNES, M. C. S.; MARTINEZ, D. S. T.; MAURER-MORELLI, C. V.; THOMAZ, A. A.; CASTRO, V. L. S. S. de. Exploring the mechanisms of graphene oxide behavioral and morphological changes in zebrafish. Environmental Science and Pollution Research, v. 26, n. 29, p. 30508-30523, 2019.Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
Biblioteca(s): Embrapa Meio Ambiente. |
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12. | | CLEMENTE, Z.; SILVA, G. H. da; MARTINEZ, D. S. T.; MAURER-MORELLI, C. V.; NUNES, M. C. S.; THOMAZ, A. A.; CASTRO, V. L. S. S. de. Exploring the mechanisms of graphene oxide toxicity to zebrafish embryo. Applied Research in Toxicology, v. 2, p. 56, 2017. Suppl. 1. Abstracts of International Symposium on Toxicity Assesment, 18., 2017, Limeira. Ref. ISTA18-705454.Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Meio Ambiente. |
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14. | | 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. Green mecanochemical process for carbon nanotubes coating with humic acid: application and ecotoxicity evaluation. 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.Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Meio Ambiente. |
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15. | | MEDEIROS, A. M. Z.; KHAN, L. U.; SILVA, G. H. da; OSPINA, C. A.; ALVES, O. L.; CASTRO, V. L. S. S. de; MARTINEZ, D. S. T. Graphene oxide-silver nanoparticle hybrid material: an integrated nanosafety study in zebrafish embryos. Ecotoxicology and Environmental Safety, v. 209, article 111776, 2021.Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 1 |
Biblioteca(s): Embrapa Meio Ambiente. |
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16. | | COA, F.; CLEMENTE, Z.; LOPES, J. R.; RODRIGUES NETO, L. L.; CASTRO, V. L. S. S. de; BARBIERI, E.; MARTINEZ, D. S. T. Ecotoxicidade de nanotubos de carbono revestidos com ácido húmico sobre Daphnia magna. In: SIMPÓSIO DE ECOTOXICOLOGIA, 3., 2016, Rio Claro. Anais... Rio Claro: Unesp, 2016. p. 35.Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Meio Ambiente. |
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18. | | COA, F.; CLEMENTE, Z.; LOPES, J. R.; RODRIGUES NETO, L. L.; CASTRO, V. L. S. S. de; ALVES, O. L.; BARBIERI, E.; MARTINEZ, D. S. T. Nanotubos de carbono modificados com ácido húmico: preparação, caracterização e toxicidade em embriões de zebrafish. In: CONGRESSO BRASILEIRO DE ECOTOXICOLOGIA, 14., 2016, Curitiba. Anais.... Curitiba: Sociedade Brasileira de Ecotoxicologia. p. 887-888.Tipo: Artigo em Anais de Congresso |
Biblioteca(s): Embrapa Meio Ambiente. |
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19. | | SILVA, G. H. da; CLEMENTE, Z.; COA, F.; RODRIGUES NETO, L. L.; CASTRO, V. L. S. S. de; MARTINEZ, D. S. T.; MONTEIRO, R. T. R. TiO2-carbon nanotubes nanohybrid toxicity in Danio rerio embryo. Toxicology Letters, v. 280, Supplement 1, p. S210-S211, 2017. Abstracts of the 53rd Congress of the European Societies of Toxicology (EUROTOX), Bratislava, Slovakia, 2017.Tipo: Resumo em Anais de Congresso |
Biblioteca(s): Embrapa Meio Ambiente. |
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Registros recuperados : 28 | |
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