Green mecanochemical process for carbon nanotubes coating with humic acid: application and ecotoxicity evaluation.

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dc.contributorF. 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.
dc.creatorCOA, F.
dc.creatorCLEMENTE, Z.
dc.creatorLOPES, J. R.
dc.creatorRODRIGUES NETO, L. L.
dc.creatorALVES, O. L.
dc.creatorCASTRO, V. L. S. S. de
dc.creatorBARBIERI, E.
dc.creatorMARTINEZ, D. S. T.
dc.date2017-04-05T11:11:11Z
dc.date2017-04-05T11:11:11Z
dc.date2017-04-05
dc.date2016
dc.date2017-06-29T11:11:11Z
dc.date.accessioned2026-07-07T05:03:59Z
dc.descriptionNanomaterials (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.
dc.identifierIn: 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.
dc.identifierhttp://www.alice.cnptia.embrapa.br/alice/handle/doc/1068138
dc.identifier.urihttp://hdl.handle.net/123456789/479140
dc.languageeng
dc.rightsopenAccess
dc.subjectEcotoxicologia
dc.subjectNantubes
dc.titleGreen mecanochemical process for carbon nanotubes coating with humic acid: application and ecotoxicity evaluation.
dc.typeResumo em anais e proceedings

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