Sorption Equilibria of Heavy Metals on Polysiloxane with Grafted 2-aminoethylpyridine Functional Groups

A. S. Zasuhin; L. K. Neudachina; Yu. G. Yatluk; V. A. Osipova; Yu. S. Moskaleva; E. F. Muzipova; M. V. Morozova; V. A. Starcev

A. S. Zasuhin Gorky Ural State University
L. K. Neudachina Gorky Ural State University
Yu. G. Yatluk Postovsky Institute of Organic Synthesis of the Russian Academy of Sciences
V. A. Osipova Postovsky Institute of Organic Synthesis of the Russian Academy of Sciences
Yu. S. Moskaleva Gorky Ural State University
E. F. Muzipova Gorky Ural State University
M. V. Morozova Gorky Ural State University
V. A. Starcev Gorky Ural State University

Abstract

A new silica-based organic-inorganic hybrid material with grafted 2-aminoethylpyridine functional groups (SiAEP) has been synthesized by sol-gel method. Methods of the elemental analysis, 13С and 1H NMR spectroscopy have been used in order to find substance composition; surface-structural characteristics of the SiAEP have been defined by method of nitrogen adsorption–desorption isotherms. The effect of pH on the sorption of copper (II), nickel (II), cobalt (II), zinc (II), cadmium (II), and lead (II) ions has been studied. A selectivity order of SiAEP at рН=6.5 is as follows: Cu>Co>Zn>Ni>Pb>Cd. Sorption isotherms of heavy metal ions by SiAEP have been obtained, their mathematical processing by models of Langmuir, Freundlich, and Redlich-Peterson has been carried out. The values of the maximum uptake SiAEP capacity for Cu2+, Co2+, Zn2+, Ni2+, and Cd2+ ions have been defined to be of 2.04, 1.76, 1.46, 1.06, and 0.76 mmol/g, respectively.

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