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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Coating carbon nanotubes with humic acid using an eco-friendly mechanochemical method: Application for Cu(II) ions removal from water and aquatic ecotoxicity

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Coa, Francine ; Strauss, Mathias ; Clemente, Zaira ; Rodrigues Neto, Laia L. ; Lopes, Josias R. ; Alencar, Rafael S. ; Souza Filho, Antonio G. ; Alves, Oswaldo L. ; Castro, Vera Lucia S. S. ; Barbieri, Edison ; Martinez, Diego Stefani T.
Total Authors: 11
Document type: Journal article
Source: Science of The Total Environment; v. 607, p. 1479-1486, DEC 31 2017.
Web of Science Citations: 10
Abstract

In this work, industrial grade multi-walled carbon nanotubes (MWCNT) were coated with humic acid (HA) for the first time by means of a milling process, which can be considered an eco-friendly mechanochemical method to prepare materials and composites. The HA-MWCNT hybrid material was characterized by atomic force microscopy (AFM), scanning electron microscopies (SEM and STEM), X-ray photoelectron spectroscopy (XPS), termogravimetric analysis (TGA), and Raman spectroscopy. STEM and AFM images demonstrated that the MWCNTs were efficiently coated by the humic acid, thus leading to an increase of 20% in the oxygen content at the nanotube surface as observed by the XPS data. After the milling process, the carbon nanotubes were shortened as unveiled by SEM images and the values of ID/IG intensity ratio increased due to shortening of the nanotubes and increasing in the number defects at the graphitic structure of carbon nanotubes walls. The analysis of TGA data showed that the quantity of the organic matter of HA on the nanotube surface was 25%. The HA coating was responsible to favor the dispersion of MWCNTs in ultrapure water (i.e. -42 mV, zeta-potential value) and to improve their capacity for copper removal. HA-MWCNTs hybrid material adsorbed 2.5 times more Cu(II) ions than oxidized MWCNTs with HNO3, thus evidencing that it is a very efficient adsorbent material for removing copper ions from reconstituted water. The HA-MWCNTs hybrid material did not show acute ecotoxicity to the (AU)

FAPESP's process: 14/01995-9 - Nanoecotoxicologial evaluation of graphene oxide in Danio rerio (zebrafish): influence of interaction with humic substances
Grantee:Zaira Clemente
Support Opportunities: Scholarships in Brazil - Post-Doctoral