On the multifunctional character of strong basic anion-exchange resin
Abstract
The method of potentiometric titration for the strong basic anion-exchange resin AB-17-8, synthesized on a styrene-divinylbenzene matrix, revealed the presence of three kinds of functional groups. Their presence is confirmed by non-aqueous titration of anion-exchange resin samples with a solution of perchloric acid in acetone in the «isopropyl alcohol-ethylene glycol» medium in a 1:1 ratio by volume. The ionization
constants of ionogenic groups that can characterize strongly dissociated benzyltrimethylammonium groups (pKb1=1.72÷1.78) are determined; tertiary, secondary and primary amino groups located in the aliphatic chain of the matrix have pKb2 = 4.32÷4.38; tertiary, primary and secondary amino groups attached directly to the aromatic ring have pKb3=7.72÷7.82. It turned out that only the first two groups with low pKb values
participate in the ion exchange with silicic acid. The content of weakly dissociating ionogenic groups with pKb3=7.72÷7.82 in different batches of anion-exchange resin can be as much as 12÷34% according to our data. This fact (polyfunctionality of the anion-exchange resin) must be taken into account when discussing the various regularities of ion-exchange processes, as well as in predicting the sorption of anions of weak
organic and mineral acids.
Downloads
References
2. Mamchenko A.V., Vajnman A.B., Pilipenko I.V., Himiya i tekhnologiya vody, 1997, Vol. 19, No 5, pp. 488-493.
3. Zyablov A.N., Bajdicheva O.V., Kalach A.V., Selemenev V.F., Zhurn. fiz. Himii, 2008, Vol. 82, No 2, pp. 384-386.
4. Zyablov A.N., Eliseeva T.V., Selemenev V.F., Zhurn. fiz. himii., 2003, Vol. 77, No 12, pp. 2175.
5. Gel'ferih F. Ionity, M., Izd-vo inostrannoj literatury, 1962, 490 p.
6. Ashirov A. Ionoobmennaya ochistka stochnyh vod, rastvorov i gazov. Leningrad, Himiya, 1983, 295 p.
7. Semushin A.M., Yakovlev V.A., Ivanova E.V. Infrakrasnye spektry pogloshcheniy aionoobmennyh materialov / Spravochnoe posobie. Leningrad, Himiya, 1981, 95 p.
8. Saldadze K.M. // KHromatografiya i ee primenenie. M., Izd-vo Akademii nauk SSSR, 1960, pp. 27-32.
9. Muromceva G.V., Ol'shanova K.M., Saldadze K.M., V.D. Kopylova, Issledovanie svojstv ionoobmennyh materialov. M., Nauka, 1964, pp. 108-114.
10. Saldadze K.M., Ol'shanova K.M., Kopylova V.D.,/ Ionoobmennye sorbenty v promyshlennosti, M., Izd-vo AN SSSR, 1963, pp. 66-70.
11. Myagkoj O.N., Suslina T.G., Shchedrina V.B., Sintez i svojstva ionoobmennyh materialov, M., Nauka, 1968, pp. 227-235.
12. Kazancev E.I., Paholkov V.S., Kokoshko Z.Yu., Chupahin O.N., Ionoobmennye materialy i ihsintez. Sverdlovsk, Izd-vo UPI, 1968, 149 sp.
13. Gregor H.R., Hamilton M.J., J. Phys. Chem., 1955, Vol. 59, No 9, pp. 874-881. 14. Katchalsky A., Spitnik P., J. Polimer Sci., 1947, Vol. 2, No 4, pp. 432-446.
15. Polyanskij N.G., Gorbunov G.V., Polyanskaya N.L., Metody issledovaniy aionitov, M., KHimiya, 1976, 206 p.
16. Ryzhov E.M., Zhurn. Fiz. Himii, 1979, T. 13, No 9, pp. 2323-2325.
17. Kunin R., Fisher S., J. Phys. Chem., 1962, Vol. 66, No 11, pp. 2275-2277.
18. Saldadze K.M., Kopylova V.D. Kompleksoobrazuyushchie ionity (kompleksity), M., KHimiya, 1980, 336 p.
19. Savickaya E.M., Ionoobmennye sorbenty v promyshlennosti, M., Izd-vo AN SSSR, 1963, pp. 11-20.
20. Kiselev E.D., Chmutov K.V., Pashkov A.B., Issledovanie svojstv ionoobmennyh materialov. M., Nauka, 1964, pp. 163-172.
21. Pashkov A.B., Itkina M.I., Simanchuk S.M., Hromatografiya i ee primenenie, M., Izdvo Akademii nauk SSSR, 1960, pp. 56 -71.
22. Praktikum po ionnomu obmenu. Selemenev V.F., Slavinskaya G.V., KHohlov V.Yu., Chikin G.A. Uchebnoe posobie. Voronezh, Izdvo
Voronezh. gos. un-ta, 1999, 173 p.
23. Prakticheskoe rukovodstvo po fizikohimicheskim metodam analiza / Pod red. akademika Alimarina I.P., d.h.n. Ivanova V.M. M., MGU, 1987, 205 p.
24. Kreshkov A.P., Bykova L.N., Kazaryan N.A. Kislotno-osnovnoe titrovanie v nevodnyh sredah / Pod obshchej red. A.P. Kreshkova, M., Himiya,1967, pp. 79-84.
