Scientists from the Kola Science Centre of the Russian Academy of Sciences have studied the mechanism of the transformation of the mineral parakeldyshite into keldyshite, which allowed them to clarify its crystal structure and chemical formula. The research opens up the possibility of creating reliable selective sorbents for industrial applications.
Keldyshite was first discovered in the Lovozero massif in the Kola Peninsula. Modern studies have shown that many samples previously considered keldyshite are actually partially protonated and sodium-depleted parakeldyshite.
The transformation mechanism was studied by hydrolyzing parakeldyshite in hydrochloric acid solutions of different concentrations and at different temperatures. Experiments showed that the mineral loses a significant portion of its sodium even under mild conditions, and keldyshite forms with increasing acid concentration and reaction time. A key role is played by the formation of a strong hydrogen bond, which is absent in the original parakeldyshite.
The results will allow the creation of materials with a similar structure, including industrial ion-exchange sorbents.
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