The kinetics of adsorption binding of Ba2+ ions by trimethylsilylated silica
| Autor: | T. V. Dmytrotsa, V. I. Mandzyuk, Hanna Vasylyeva, I. F. Myronyuk, N. A. Bezruka |
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| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: | |
| Zdroj: | Фізика і хімія твердого тіла, Vol 19, Iss 1, Pp 66-73 (2018) |
| ISSN: | 2309-8589 1729-4428 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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