The kinetics of adsorption binding of Ba2+ ions by trimethylsilylated silica
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.
 A. A. Chuiko, The chemistry of silica surface (UkrINTEI, Kiev, 2001) (in russian).
 A. A. Chuiko, The medical chemistry and clinical application of silica (Naukova dumka, Kiev, 2003) (in russian).
 A. A. Chuiko, Yu. I. Gorlov, V. V. Lobanov, Structure and chemistry of silica surface (Naukova dumka, Kiev, 2007) (in russian).
 V. A. Tertykh, A. A. Belyakova, Chemical reactions involving the silica surface (Naukova dumka, Kiev, 1991) (in russian).
 V. M. Gun’ko, V. V. Turov, I. F. Myronyuk, O. V. Goncharuk, E. M. Pakhlov, N. A. Bezruka, E. Skwarek, W. Janusz, J.P. Blitz, J. Coll. Int. Sci., 434, 28 (2014).
 I. F. Myronyuk, V. I. Mandzyuk, N. A. Bezruka, Ye. P. Voronin, O. V. Goncharuk, V. M. Ogenko, Physics and Chemistry of Solid State, 15(2), 358 (2014) (in ukrainian).
 І.F. Myronyuk, B.M. Yaremchuk, T.V. Gergel, V.І. Mаndzyuk, Physycs and Chemistry of Solid State, 7(4), 731 (2006) (in ukrainian).
 І. F. Myronyuk, V. L. Chelyadyn, R. R. Yakubovskyi, V. O. Kotsyubynsky, Physycs and Chemistry of Solid State, 11(2), 409 (2010) (in ukrainian).
 G. Schwarzenbach, H. Flaschka, Complexometric titration (Khimia, Moscow, 1970) (in russian).
 V. P. Vasiliev, Analytical chemistry (Vyshcha shkola, Moskow, 1989) (in russian).
 V. I. Kabachnyi, L. K. Osipenko, L. D. Hrytsan, et. al., Physical and colloidal chemistry (Prapor, Kharkiv, 1999) (in ukrainian).
 M. Kanna, S. Wongnawa, P. Sherdshoopongse, P. Boonsin, Songklanakarin J. Sci. Technol., 27(5), 1017 (2005).
 A. K. Agarwal, M. S. Kadu, J. Chem. Technol. Metall., 50(5), 601 (2015).
 I. Sharma, D. Goyal, J. Sci. Ind. Res., 68, 640 (2009).
 L. A. Belyakova, O. M. Shvets, Chem. Phys. Tech. Surf., 1(3), 274 (2010).
 W. Rudzinski, W. Plazinsky, Phys. Chem B., 110(33), 16514 (2006).
 Y.-S. Ho, Scientometrics, 59(1), 171 (2004).
 Y.-S. Ho, G. McKay, Proc. Biochem., 34, 451 (1999).
 S. A. Nedil’ko, Mathematical methods in chemistry (Lubid’, Kyiv, 2005) (in ukrainian).
 M. Ezekiel, K.A. Fox, Methods of correlation and regression analysis, linear and curvilinear (Wiley, New York 1959).
 I. F. Myronyuk, Y. P. Voronin, V. І. Mandzyuk, N. A. Bezruka, T. V. Dmytrotsa, J. Nano- Electron. Phys., 9(5), 05030-1 (2017).
 I. F. Mironyuk, V. V. Lobanov, V. M. Ogenko, Theor. Exp. Chem., 36(5), 264 (2000).
 I. F. Myronyuk, V. V. Lobanov, V. M. Ogenko, Physics and Chemistry of Solid State, 1(2), 177 (2000) (in ukrainian).