Assessing the efficiency of redoxites derived from a weakly acidic cationite dowex mac-3 by iron compounds
DOI:
https://doi.org/10.15587/1729-4061.2015.50615Keywords:
oxygen, cationite, redoxite, sorption, iron, capacity, ion exchange, hardness, tap water, distilled waterAbstract
The best option for reducing corrosion aggressiveness of water is to extract oxygen from it. The dissolved oxygen is commonly removed with the help of redoxites, i.e. ionites modified by reducing agents. However, derivation and use of redoxites envolve problems of modifying ionites, assessing their quality, renewable capacity and reliability as well as the problem of durability.
The study reveals the process of removing oxygen from tap water, distilled water and a mixture of tap and distilled water in the ratio of 1:1 by means of redoxites, on the basis of iron (II) compounds-modified cationite Dowex mac-3. We have disclosed the impact of the ionite shape on the secondary water pollution with iron ions and proved that the effectiveness of deoxygenation depends on the hardness of water and the type of ionite.
Ionites were modified by processing a certain amount of placed in column cationite with application of modifying reagents in a given sequence at the selected optimal conditions of modification. Salt with a chemical element of variable valence––iron sulfate (FeSO4 ∙ 7H2O)––was used as a modifier.
It is proved that ionite in the form of Fe2+ effectively restores oxygen at an early stage. The oxygen exchange capacity amounted to 536 mg-eq/dm3, and the total exchange capacity reached 1,251 mg-eq/dm3. The disadvantage is desorption of iron from the surface of the ionite and its replacement by calcium ions.
It is found that in the case of ionite with hydrolyzed iron, iron ions were not desorbed when distilled water was passing through a layer of ionite.
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Copyright (c) 2015 Микола Дмитрович Гомеля, Тетяна Анатоліївна Корда, Юлія Вікторівна Носачова, Тетяна Віталіївна Потильчак
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