The kinetics of adsorption binding of Ba2+ ions by trimethylsilylated silica

I. F. Myronyuk; H. V. Vasylyeva; V. I. Mandzyuk; N. A. Bezruka; T. V. Dmytrotsa

doi:10.15330/pcss.19.1.66-73

Authors

I. F. Myronyuk Vasyl Stefanyk Precarpathian National University
H. V. Vasylyeva Uzhhorod National University
V. I. Mandzyuk Vasyl Stefanyk Precarpathian National University
N. A. Bezruka Ivano-Frankivsk National Medical University
T. V. Dmytrotsa Ivano-Frankivsk National Medical University

DOI:

https://doi.org/10.15330/pcss.19.1.66-73

Keywords:

silica, silanols, chemosorption, trimethylsilyl groups, adsorption binding of ions

Abstract

It was established that incomplete substitution of free silanols of fumed silica surface on (CH₃)₃Si-groups leads to an increase in the ability of modified SiO₂ to adsorb Ba²⁺ cations from an electrolyte solution. Silica with 48.3% of trimethylsilyl (TMS) groups adsorbs 1.8 mmol·g^-1 of Ba²⁺ cations from 0.01 M BaCl₂ solution, that in 3 times more than the adsorption of these cations by unmodified silica. It was found that the adsorption of cations by basic and modified silica is well described by the pseudo-second order Lagergren equation. The high adsorption activity of silica with chemisorbed TMS-groups is due to the formation of local regions with relatively large values of negative and positive electrostatic potentials in the vicinity of grafted TMS-groups.

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