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THE EFFECT OF THE pH ON THE ABSORPTION OF HEXAVALENT CHROMIUM IONS BY HYBRID ADSORBENTS BASED ON TITANIUM OXYHYDRATE AND ORGANIC ANIONITE

T.V. Maltseva 1, A.V. Palchik 1, T.V. Yatsenko 1, S.L. Vasilyuk 1, V.O. Shablovski 2

1 – Vernadsky Institute of general and inorganic chemistry NAS Ukraine,Kiev,Ukraine

2 – Research Institute for Physical-Chemical Problems of theBelarusianStateUniversity,

Minsk, Belarus

e-mail: maltseva@ionc.kiev.ua

Studied the absorption of hexavalent chromium ions by hybrid ion exchange materials synthesized from 0.1-1.0 mM K2Cr2O7 solution without changing the acidity of solutions and with adding a solution of nitric acid to the initial pH = 2.4-2.7.For hybrid materials containing ~ 7, 24 and 36% by weight of titanium hydroxide, changing absorption capacity of components relative to hexavalent chromium ions, in particular, the distribution coefficient is according to the rule of additivity.With the addition of nitric acid pH = 2.4 in the initial solutions K2Cr2O7 for a hybrid sorbent containing ~ 36% by weight of titanium hydroxide, found a non-additive increase in the value of the distribution coefficient of hexavalent chromium ions. The degree of non-additivity of absorption capacity the ion exchange material increases significantly as the concentration of the solution.

Keywords: hybrid materials, titanium hydroxide, chromium ions, distribution coefficient, additivity.

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06.04.2016 at 6:04 pm