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Received August 6, 2015
Accepted November 26, 2015
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This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits
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Rapid adsorption of cobalt (II) by 3-aminopropyltriethoxysilane modified halloysite nanotubes
Department of Chemistry, Qinghai Normal University, Xining 810008, P. R. China
Korean Journal of Chemical Engineering, December 2016, 33(12), 3504-3510(7), 10.1007/s11814-015-0260-2
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Abstract
The adsorption of cobalt (II) by 3-aminopropyltriethoxysilane (APTS) modified halloysite nanotubes (HNTs) was studied. The modified halloysite was characterized by Fourier transform infrared spectroscopy (FT-IR), XRay diffraction (XRD) and thermogravimetry (TG). In addition, a batch method was used to study the adsorption behavior and the mechanism of removal Co (II) by modified HNTs; the effective factors influencing the adsorption process including adsorbent concentration, contact time, initial pH, temperature and the initial concentration of Co (II) have been investigated. The results showed that the APTS was successfully grafted on the HNTs surface. The modified HNTs exhibited rapid adsorption speed, which reached the adsorption equilibrium within 30 min. The adsorption capacity of the adsorbent increased significantly with the increase of pH. The adsorption data of Co (II) on the modified HNTs are well consistent with the Langmuir model and the pseudo-second-order kinetic model.
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