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Int. J. Environ. Res. Public Health 2017, 14(12), 1453; doi:10.3390/ijerph14121453

Radioactive Cobalt(II) Removal from Aqueous Solutions Using a Reusable Nanocomposite: Kinetic, Isotherms, and Mechanistic Study

1
College of Science, Inner Mongolia Agricultural University, Hohhot 010018, China
2
College of Material Science and Art Design, Inner Mongolia Agricultural University, Hohhot 010018, China
3
Department of Sustainable Biomaterials Virginia Tech University, Blacksburg, VA 24061, USA
*
Author to whom correspondence should be addressed.
Received: 24 September 2017 / Revised: 15 November 2017 / Accepted: 21 November 2017 / Published: 24 November 2017
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Abstract

A lignocellulose/montmorillonite (LMT) nanocomposite was prepared as a reusable adsorbent for cobalt(II) ions, and characterized by nitrogen (N2) adsorption/desorption isotherm, X-ray Diffraction (XRD), Scanning Electron Microscope (SEM), Transmission Electron Microscopy (TEM), and Fourier Transform Infrared Spectroscopy (FTIR). LMT exhibited efficient adsorption of cobalt ions (Co(II)), and the adsorbed Co(II) was readily desorbed by nitric acid (HNO3). All parameters affecting the adsorption and/or desorption of Co(II), including initial Co(II) concentration, pH value, temperature, HNO3 concentration, and time, were optimized. The kinetic data analysis showed that the adsorption followed the pseudo-second-order kinetic model and fit well into the Langmuir isotherm equation. Notably, the nanocomposite can be used four times without significantly losing adsorbent capability. The Energy-Dispersive X-ray (EDX) and FTIR spectra analysis also revealed that the adsorption mechanism may be mainly a chemical adsorption dominated process. View Full-Text
Keywords: nanocomposite; cobalt(II); adsorption; desorption; kinetic; isotherms nanocomposite; cobalt(II); adsorption; desorption; kinetic; isotherms
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Zhang, X.; Wang, X.; Chen, Z. Radioactive Cobalt(II) Removal from Aqueous Solutions Using a Reusable Nanocomposite: Kinetic, Isotherms, and Mechanistic Study. Int. J. Environ. Res. Public Health 2017, 14, 1453.

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