POTENTIOMETRIC TITRATION OF NATURAL CLINOPTILOLITES
Abstract
Acid-base properties of zeolite tuffs of Cheboksary, Holin and Tedzamy deposits were studied by potentiometric titration of their decationized forms with HСl solution at concentration of background electrolyte 1 M and 0.1 M КСl. The acidity parameters of individual types of the clinoptilolite ion-exchange centers of have been calculated from the titration curves of the zeolites using the method of computer modelling of potentiometric titration data suggested earlier. The full exchange capacities were determined by К+ ion using static and dynamic methods. Potentiometric titration was carried out by the titration of the zeolites using one sample method. The clinoptilolites contain at least three types of the sorption centers. They differ in the acid strength expressed by the pK parameter and its dependence of the degree of neutralization ∆pk. The amount of strong acidic groups (pK1= 0.2) is 0.13–0.26 m-eq/g. The number of weak acid groups in the samples of clinoptilolites is different (pK2 > 3 and pK3 > 7).
About the Authors
O. A. Samoilenko
Institute of Physical Organic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Researcher
V. S. Soldatov
Institute of Physical Organic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Academician, D. Sc. (Chemistry), Professor, Head of Laboratory
P. V. Nesteronok
Institute of Physical Organic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Researcher
References
1. Brek D., Tseolitovye molekuliarnye sita [Zeolite molecular sieves], Nedra, Moscow, RU, 1983.
2. Tsitsishvili G. V., Andronikoshvili G. T., Ktorov T. N., Prirodnye tseolity [Natural zeolites], Khimiia, Moscow, RU, 1985.
3. Romanov G. A., Tseolity: effektivnost’ i primenenie v sel’skom khoziaistve [Zeolites: efficiency and application in agriculture], Moscow, RU, 2000.
4. Anurov S. A., Kel’tsev A. V., Torocheshnikov N. S., “Adsorption isotherms of sulfurous anhydride on natural zeolite”, Trudy Instituta / Ministerstvo vysshego i srednego spetsial’nogo obrazovaniia SSSR, Moskovskii khimiko-tekhnologicheskii institut imeni D. I. Mendeleeva [Proceedings of the Institute / Ministry of Higher and Secondary Special Education of the USSR, Moscow Chemical Technology Institute named after D. I. Mendeleyev], 1974, vol. 79, pp. 3–4.
5. Anurov S.A., Belitskii I.A., Kravtsova I.D., Kel’tsev A. V., “Dynamics of sulfur dioxide adsorption by natural zeolite”, Trudy Instituta / Ministerstvo vysshego i srednego spetsial’nogo obrazovaniia SSSR, Moskovskii khimiko-tekhnologicheskii institut imeni D. I. Mendeleeva [Proceedings of the Institute / Ministry of Higher and Secondary Special Education of the USSR, Moscow Chemical Technology Institute named after D. I. Mendeleyev], 1974, vol. 79, pp. 5–7.
6. Chelishchev N.F., Berenshtein V.G., Klinoptilolit [Clinoptilolite], VIEMS, Moscow, RU, 1974.
7. Kochkin Iu. N., Vlasenko N. V., “Effect of the acidity spectrum of zeolites of different structural type on their catalytic characteristics in the synthesis reaction of ETBE”, Teoreticheskaia i eksperimental’naia khimiia [Theoretical and experimental chemistry], 2002, vol. 38, no. 2, pp. 120–124.
8. Eremenko A. M., Sardarly A. M., Neimark I. E., Tel’biz G. M., Galich P. M., “Investigation of the acidity of zeolite-containing catalysts by the method of luminescence spectroscopy”, Teoreticheskaia i eksperimental’naia khimiia [Theoretical and experimental chemistry], 1977, vol. 13, no. 4, pp. 549–553.
9. “Agrochemistry”, Available at: http://agrohimija.ru/ceolity/2411-harakteristika-sorbcionnoy-sposobnosti-prirodnyhceolitov.html, (accessed 07.10.2016).
10. Panasiugin A. S., Tsyganov A. R., Lomonosov V. A., Masherova N. P., “Efficiency of the use of natural minerals in the localization of the effects of radioactive contamination in the course of emerging technogenic catastrophes”, in Chazov O. V., Novikov I. A. (ed.), Ekologiia i zashchita okruzhaiushchei sredy : sbornik tezisov dokladov III Mezhdunarodnoi nauchno-prakticheskoi konferentsii, Minsk, 19 maia 2016 g. [Ecology and environmental protection: a collection of abstracts of the III International Scientific and Practical Conference, Minsk, May 19, 2016], Minsk, BY, 2016, pp. 228–230.
11. Soldatov V.S., Sosinovich Z.I., Korshunova T.A., “Rapid potentiometric titration of ion exchangers”, Doklady Natsional’noi akademii nauk Belarusi [Doklady of the National Academy of Sciences of Belarus], 2001, vol. 45, no. 2, pp. 71–74.
12. Nesterenok P. V., Soldatov V. S., “Protolytic properties of aminocarboxyl polyampholites based on the modacrylic polymer matrix”, Vestsi Natsyianal’nai akademii navuk Belarusi: Seryia khimichnykh navuk [Proceedings of the National Academy of Sciences of Belarus. Chemistry Series], 2014, no. 4, pp. 72–79.
13. “Nester”, Available at: http://copoka.by/nester/, (accessed 10.10.2016).
Review
Views: 622
Email this article 