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  • Title: Magnetic carboxylated cellulose nanocrystals as adsorbent for the removal of Pb(II) from aqueous solution.
    Author: Lu J, Jin RN, Liu C, Wang YF, Ouyang XK.
    Journal: Int J Biol Macromol; 2016 Dec; 93(Pt A):547-556. PubMed ID: 27614195.
    Abstract:
    A novel magnetic carboxylated cellulose nanocrystal composite (CCN-Fe3O4) was prepared as an adsorbent for the adsorption of Pb(II) from aqueous solution. The new adsorbent was characterized by transmission electron microscopy, vibrating sample magnetometry, Fourier-transform infrared spectroscopy, and X-ray photoelectron spectroscopy. Batch experiments were carried out to investigate the effects of contact time, adsorbent dose, pH, and temperature on adsorption capacity. Pb(II) adsorption onto CCN-Fe3O4 reached equilibrium in 240min, and the maximum adsorption capacity of Pb(II) was 63.78mgg-1 at 298.2K. The equilibrium data fitted the Langmuir isotherm model better than the Freundlich isotherm model, and they were well explained in terms of pseudo-second-order kinetics. Thermodynamics studies indicated that the adsorption of Pb(II) onto CCN-Fe3O4 was spontaneous and endothermic in nature. The adsorbent could also be regenerated with acid treatment and successfully reapplied.
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