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

  • 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
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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Published
2018-03-15
How to Cite
[1]
MyronyukI.F., VasylyevaH.V., MandzyukV.I., BezrukaN.A. and DmytrotsaT.V. 2018. The kinetics of adsorption binding of Ba2+ ions by trimethylsilylated silica. Physics and Chemistry of Solid State. 19, 1 (Mar. 2018), 66-73. DOI:https://doi.org/10.15330/pcss.19.1.66-73.
Section
Review