1. Rao, G.P., Lu, C., and Su, F., Sorption of divalent metal ions from aqueous solution by carbon nanotubes: a review, Separat. Purificat. Technol., 2007, vol. 34, no. 1, pp. 224–231.
2. Bele, C., Carbon nanotubes as a new solid phase extraction sorbent for analysis of environmental pollutants, Carbon Nanotubes, Marulanda, J.M, Ed., InTech, 2010, pp. 423–541.
3. Ying, W. and He, Y., A review on adsorption of metal ions from solution by carbon nanotubes, New Chem. Mater., 2010, vol. 5, pp. 112–117.
4. Zhao, G., Wu, X., Tan, X., and Wang, X., Sorption of heavy metal ions from aqueous solutions: a review, Open Coll. Sci. J., 2011, vol. 4, pp. 19–31.
5. Li, H., Pan, L., Zhang, Y., and Sun, Z., Ferric ion adsorption and electrode sorption by carbon nanotubes and nanofibres films, Water Sci. Technol., 2009, vol. 59, no. 8, pp. 1657–1663.