期刊
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
卷 93, 期 -, 页码 547-556出版社
ELSEVIER
DOI: 10.1016/j.ijbiomac.2016.09.004
关键词
Lead removal; Carboxylated cellulose nanocrystal; Magnetic separation
资金
- National Natural Science Foundation of China [21476212]
- Zhoushan Municipal Bureau of China [2015C4 1004]
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 240 min, and the maximum adsorption capacity of Pb(II) was 63.78 mg g(-1) at 298.2 K. 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. (C) 2016 Elsevier B.V. All rights reserved.
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