A study on Pb(II) adsorption kinetic from aqueous solution of carbon nanotubes modified by oxidation
Abstract
In the present study, the carbon nanotubes (CNTs) modified by the oxidation are used as Pb(II) adsorbent from aqueous solution with the oxidant of the mixture containing nitric and sulfuric acids. Pb(II) adsorption ability of modified CNTs (ox-CNTs) is investigated at different temperatures with different initial concentrations of Pb(II). The adsorption reaches equilibrium state after 80 min. Effects of pH and adsorbent dosage to Pb(II) removal are surveyed. Chemisorption nature is proved and well described by pseudo-second-order kinetic model. Low activation energy of Pb(II) adsorption implies that the adsorption quickly occurs and is a diffusion-controlled process. Ion exchange mechanism of Pb(II) sorption onto ox-CNTs is clarified.
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