SORPTION BEHAVIOR OF Cu(II), Pb(II), AND Zn(II) ONTO CARBON NANOTUBES

作者：Pyrzynska Krystyna^*; Stafiej Anna

来源：Solvent Extraction and Ion Exchange, 2012, 30(1): 41-53.

DOI：10.1080/07366299.2011.581056

• Multiwall carbon nanotubes
• metal ions
• solid phase extraction
• preconcentration

The sorption behavior of Cu((II), Zn(II), and Pb(II) onto multiwall carbon nanotubes (CNTs) oxidized with nitric acid was investigated. The effect of pH and metal ion concentration on their retention were studied together with more detailed information on the structural properties of CNTs, such as the surface area, the amount of acidic groups, and the pH value of the point of zero charge. The main adsorption mechanism of metal ions into CNTs is considered as a complexation with the surface oxygen-containing functional groups, and the experimental data have been fitted well by the Langmuir sorption model. The theoretical capacity of the monolayer derived from this model for Cu(II), Pb(II), and Zn(II) are 24.7, 25.6, and 14.7 mg/g, respectively. The sorption kinetic profile is fitted well for the pseudo-second order equation. The procedure for sorption of the studied metal ions shows high tolerance to the excess of alkaline and alkaline-earth metals.

• 出版日期2012