Sorption properties of silicate materials based on Ca2SiO4 in humic acid solutions |
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| Authors: | I V Volkov E V Polyakov N A Khlebnikov N M Barysheva |
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| Affiliation: | 1. Institute of Solid State Chemistry, Ural Branch, Russian Academy of Sciences, ul. Pervomaiskaya 91, Yekaterinburg, 620990, Russia
2. All-Russia Research Institute of Technical Physics, Russian Federal Nuclear Center, Snezhinsk, Chelyabinsk oblast, Russia
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| Abstract: | The effect of humic acids (HA) in river water on the sorption properties of metallurgical slag (major component Ca2SiO4) was revealed in batch sorption experiments. Interaction of HA with sorbate cations in solution and with the sorbent surface affects the character of the sorption process found previously for dicalcium silicate. This interaction results in a decrease in the affinity of dicalcium silicate to multiple-charged cations REE(III), U(VI), Th(IV)] in their sorption from river water by more than an order of magnitude. Possible chemical transformations responsible for a decrease in the sorption affinity of the silicate sorbent are discussed: complexation of HA with metal cations in the aqueous phase and competing reactions of the sorption of HA and calcium humate complexes on the surface of sorbent particles. |
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