The Kinetics of Adsorption Binding of Ba2+ Ions by Trimethylsilylated Silica
Journal Title: Фізика і хімія твердого тіла - Year 2018, Vol 19, Issue 1
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.
Authors and Affiliations
I. F. Myronyuk, H. Vasylyeva, V. I. Mandzyuk, N. A. Bezruka, T. V. Dmytrotsa
Keywords
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- EP ID EP328229
- DOI 10.15330/pcss.19.1.66-73
- Views 74
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