Journal
CHEMSUSCHEM
Volume 6, Issue 2, Pages 367-373Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.201200413
Keywords
carbon; environmental chemistry; lead; nanotubes; zinc
Funding
- EU [ITN FINELUMEN PITN-GA-2008-215399]
- FRS-FNRS [2.4.550.09, 2.4.617.07.F, MIS F.4.505.10.F]
- Loterie Nationale
- Region Wallonne through SOLWATT program (SUNTUBE) [850551]
- excellence program OPTI2MAT
- TINTIN ARC project [09/14-023]
- Universities of Namur and Trieste
- FRS-FNRS
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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.
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