Complexation of Transition Metal Ions on the Surface
of Carboxyethylated Aminopolysiloxanes

L. K. Neudachina and N. V. Lakiza

Ural Federal University named after the first President of Russia B.N. Yeltsin, ul. Mira 19, Ekaterinburg, 620002 Russia

e-mail: Natalya_Lakiza@mail. ru

Received October 7, 2013

Abstract—The effect of the nature of the sorbent matrix and the state of ions of some transition metals in solu-
tion on their sorption by carboxyethylated alumino-, zircono-, and titano-aminopolysiloxanes was studied.
Modification of the aminopolysiloxane matrix with zirconia, alumina, or titania results in displacement of the
optimal sorption ranges for copper(II), nickel(II), and cobalt(II) to alkaline pH. Comparison of the results of
structural studies of the complexes of N-aryl-3-aminopropionic acids in solutions and compositions of equilib-
rium solutions upon sorption of metal ions from ammonia–acetate buffer systems demonstrated that metal ions
are simultaneously coordinated by the functional groups of iminodipropionic acid, which are rigidly attached
to on the polysiloxane matrix, and by monodentate molecular ligands (ammonia molecules) present in the
buffer solution. A competitive influence of copper(II), nickel(II), and cobalt(II) on the sorption from mixed
solutions was established.

DOI: 10.1134/S0036023614060151

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