Titration of weak base fibrous anion exchangers in the presence of complex-forming divalent cations
https://doi.org/10.29235/1561-8331-2021-57-4-391-399
Abstract
Curves of potentiometric titration of fully protonized fibrous ion exchangers with potassium hydroxide against the background of 1 M KCl in the presence of chlorides of Ni2+, Со2+, Сu2+ and Ca2+ were obtained. The ion exchangers were synthesized by modifying of industrial polyacrylonitrile fiber with diethylenetriamine and triethylenetetraamine and predominantly contained functional groups R-CO-NH- (CH2CH2NH)nH (n = 2 or 3) and a small amount of carboxyl groups. The sorption of Ni2+, Со2+, Сu2+ и Ca2+by ion exchangers was calculated from the data obtained depending on the pH of the medium. It was found that the investigated ion exchangers with high selectivity sorb heavy metal ions in a wide range of acidity of solutions (pH 2–9) due to the formation of metal-polymer complexes with polyamine functional groups. The maximum sorption capacity is 1.5–2.7 and 4–5 meq/g for ion exchangers with n = 2 and 3, respectively.
About the Authors
V. S. Soldatov
Institute of Physical Organic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Vladimir S. Soldatov – Academician, D. Sc. (Chemistry), Professor, Chief Researcher
13, Surganov Str., 220072, Minsk, Republic of Belarus
L. N. Shachenkova
Institute of Physical Organic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Larisa N. Shachenkova – Ph. D. (Chemistry), Senior Researcher
13, Surganov Str., 220072, Minsk, Republic of Belarus
E. G. Kasandrovich
Institute of Physical Organic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Evgenii G. Kasandrovich – D. Sc. (Chemistry), Associate Professor, Head of the Laboratory
13, Surganov Str., 220072, Minsk, Republic of Belarus
P. V. Nesteronok
Institute of Physical Organic Chemistry of the National Academy of Sciences of Belarus
Belarus
Belarus
Petr V. Nesteronok – Ph. D. (Chemistry), Senior Researcher
13, Surganov Str., 220072, Minsk, Republic of Belarus
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