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Solid Phase Extraction of Trace Cobalt(II) from Aqueous Solutions through Physicochemical Adsorption by Surface Ion-Imprinted Polymer

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Abstract:

A novel surface ion-imprinted polymer (S-IIP) has been synthesized by surface ion-imprinting concept in the presence of sodium trititanate whisker, Sr(II), chitosan and γ-Glycidoxypropyl trimethoxysilane (KH-560) for selective solid-phase extraction (SPE) of trace Co(II) from aqueous solutions. Characterizations of S-IIP were achieved by FT-IR spectra, SEM and surface area measurement. Results showed that the adsorption of cobalt(II) onto S-IIP follows pseudo-second order kinetics and could be fitted by the Langmuir isotherm with the maximum adsorption capacity Q being 8.27 mg×g-1 at 25°C. Thermodynamic parameters including DHº, DGº and DSº were calculated and it is indicated that Co(II) adsorption on S-IIP is exothermic, spontaneous and physical adsorption reaction. Moreover, according to the dimensionless separation factor RL (RL<1) it indicates that it’s a highly favourable adsorption. Finally, the detection limit (3s) of 5.6 ng·mL-1 with the relative standard deviation (RSD) for 1.0 μg×mL-1 cobalt(II) of 1.86% (n=10) were obtained.

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Periodical:

Advanced Materials Research (Volumes 726-731)

Pages:

700-706

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.726-731.700

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Online since:

August 2013

Authors:

Ming Pang, Hong Mei Wang, Wen Lin Hu, Li Li

Keywords:

Cobalt(II), Isotherm, Kinetic, Solid-Phase Extraction (SPE), Surface Imprinting

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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