Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/79676
Type: Artigo de periódico
Title: Structural and proactive safety aspects of oxidation debris from multiwalled carbon nanotubes
Author: Stefani, D
Paula, AJ
Vaz, BG
Silva, RA
Andrade, NF
Justo, GZ
Ferreira, CV
Souza, AG
Eberlin, MN
Alves, OL
Abstract: The removal of oxidation debris from the oxidized carbon nanotube surface with a NaOH treatment is a key step for an effective functionalization and quality improvement of the carbon nanotube samples. In this work, we show via infrared spectroscopy and ultrahigh resolution and accuracy mass spectrometry that oxidation debris obtained from HNO3-treated multiwalled carbon nanotubes is a complex mixture of highly condensed aromatic oxygenated carbonaceous fragments. We have also evaluated their cytotoxicity by using BALB/c 3T3 mouse fibroblasts and HaCaT human keratinocytes as models. By knowing the negative aspects of dissolved organic carbon (DOC) to the water quality, we have demonstrated the removal of these carbon nanotube residues from the NaOH solution (wastewater) by using aluminium sulphate, which is a standard coagulant agent used in conventional drinking water purification and wastewater treatment plants. Our results contribute to elucidate the structural and proactive safety aspects of oxidation debris from oxidized carbon nanotubes towards a greener nanotechnology. (C) 2011 Elsevier B.V. All rights reserved.
Subject: Carbon nanotubes
Mass spectrometry
Cytotoxicity
Fulvic acids
Aluminium sulphate
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.jhazmat.2011.02.050
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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