Pseudo-second-order kinetic equations for modeling adsorption systems for removal of lead ions using multi-walled carbon nanotube

By D. Robati. Journal of Nanostructure in Chemistry, 2013

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This study investigated the lead ion removal of the multi-walled carbon nanotubes (MWCNTs) and oxidized multi-walled carbon nanotubes (MWCNT-COOH). The main purpose of this work is to study the possibilities on the removal of Pb(II) ions from aqueous solutions using MWCNTs and MWCNT-COOH surfaces as adsorbents. Removal of Pb(II) ions was investigated using solutions with different concentrations in the range 10 to 100 mg/L. In this study, removal of Pb(II) ions on surfaces has been investigated by atomic absorption spectrophotometry. The microstructure of carbon nanotubes were characterized using scanning electron microscopy. Three different kinetic theories were applied to experimental data. The kinetic rates were modeled using the pseudo-first-order, four-type linear pseudo-second-order, and intraparticle diffusion. The pseudo-second-order model was found to explain the adsorption kinetics most effectively. The results indicated a significant potential of the multi-walled carbon nanotube as an adsorbent for Pb(II) ion removal.

Subfields: Biomedical Engineering, Materials Chemistry, Water Science and Technology

View Paper: https://www.semanticscholar.org/paper/6c695cea4f83759e7ec70f2a81932b1469d8ba67

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In Biomedical Engineering

In Materials Chemistry

In Water Science and Technology

Citations in the corpus

The role of nanomaterials as effective adsorbents and their applications in wastewater treatment (2017, background): “Oxidized CNTs have also shown exceptionally high sorption capacity and efficiency for Pb(II), Cd(II) and Cr(VI) from water [78, 93, 94].”
Study on the removal of heavy metal ions from industry waste by carbon nanotubes: Effect of the surface modification: a review (2016, unknown): “…Lu and Chiu, 2006; Lu et al., 2006; Moradi et al., 2011; Stafiej and Pyrzynska, 2007; Moradi et al., 2013a; Li et al., 2006; Peng et al., 2005; Robati, 2013; Saadi et al., 2013; Chen and Wang, 2006; Li et al., 2003b; Farghali et al., 2013; Moradi et al., 2012b; Chen et al., 2007; Tuzen and…”
Adsorption of mercury ions from synthetic and real wastewater aqueous solution by functionalized multi-walled carbon nanotube with both amino and thiolated groups (2014, unknown): “where qe and qt are the amount of adsorbed metal ion in mg/g on the adsorbent, at equilibrium and time t, respectively, while k1 in min −1 and k2 gmg -1 min -1 are the rate constants of first- and second-order adsorption, respectively [27,28].”