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Magnetic poly(vinylpyridine)-coated carbon nanotubes: An efficient supramolecular tool for wastewater purification
L. Maggini
•
J. Raquez
•
R. Marega
altro
BONIFAZI, DAVIDE
2013
journal article
Periodico
CHEMSUSCHEM
Abstract
Herein, we report the first example of a supramolecular carbon nanotube (CNT)-based magnetic depolluting agent for divalent metal ion (M2+) removal from aqueous solutions. In particular, magnetic multi-walled carbon nanotubes (m-MWCNTs) coated with poly(vinylpyridine) (PVPy) self-aggregate in aqueous solutions that contain divalent metal ions (such as Zn2+, Cu2+ and Pb2+) to form tight insoluble bundles in which the M2+ ions remain trapped through pyridyl-M2+-pyridyl interactions. Magnetic filtration ultimately affords the efficient separation of the depolluted solution from the precipitated M2+-CNT agglomerates. Upon acid treatment, the supramolecular threads could be disassembled to afford the free CNT-polymer hybrid, thus allowing recycling of the depolluting agent. All materials and complexation/decomplexation steps were thoroughly characterised by using thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), transmission and scanning electron microscopy (TEM and SEM, respectively). The quantification of the M2+ residual concentrations in water was evaluated by using inductively coupled plasma optical emission spectroscopy (ICP-OES), which showed that, depending on the metal cation, this material can remove up to 99 % of the contaminant. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
DOI
10.1002/cssc.201200413
WOS
WOS:000314659100018
SCOPUS
2-s2.0-84874914073
Archivio
http://hdl.handle.net/11368/2694849
http://hdl.handle.net/11368/2768363
http://www.scopus.com/inward/record.url?eid=2-s2.0-84874914073&partnerID=40&md5=0975cbe86d67e94257bf22a540258cf2
Diritti
metadata only access
Soggetti
Carbon nanotubes (CNT...
Carbon, Copper, Emiss...
Chemicals removal (wa...
Web of Science© citazioni
24
Data di acquisizione
Mar 17, 2024
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