Abstract
Different types of sorbents were tested to selectively remove oxyanions of SeIV and SeVI from model solutions containing various accompanying anions (chlorides, nitrates, sulphates) that simulate real conditions and may affect the sorption of selenium oxyanions. In addition to the optimization of sorption conditions. The best results of selenite sorption were achieved with sorbent GEH (hydrated iron oxide sorbent) and selenate sorption with Purolite S110 (N-methylglucamine functional group). The optimal pH for sorption of SeIV using GEH was found to be 3 and for sorption of SeVI it was pH 4.
Highlights
For selective removal of inorganic selenium[5] were used anion-exchange resin and functionalized cellulose sorbent Cellex T
The equilibrium was reached after 48 hours where was captured 97 % of SeIV oxyanions (9.2 g for 1 L of sorbent)
Sorption process of Purolite S110 in OH– form was as fast as using GEH, but the maximum captured amount of selenite was only 41.42 %
Summary
For selective removal of inorganic selenium[5] were used anion-exchange resin and functionalized cellulose sorbent Cellex T. The input solution was prepared from demineralized water, SeIV or SeVI (0.2 mmol·L–1), and accompanying ions such chlorides (1 mmol·L–1), nitrates (1 mmol·L–1) and sulfates (0.5 mmol·L–1). Batch equilibrium experiments were carried out with different sorbents in various forms. Sorption of SeIV oxyanions by inorganic sorbent GEH (Figure 1) was very fast than the others, especially exchange resins.
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