Study on the adsorption of strontium on granular manganese oxide

A number of optimal parameters determining the efficiency and rate of the strontium removal by a granular sorbent synthesized by the interaction of KMnO4 and concentrated H2O2 solution have been determined. The optimal drying temperature was found to be 400 °C at an average grain size of 0.1–0.2 mm. The average value of the strontium distribution coefficient in seawater equaled to 1.4–1.5 × 103 mL/g at the V/m ratio of 1000 mL/g ratio. The maximum value of adsorption in a single-component solution calculated using the Langmuir equation was equal to 1.0–1.1 mmol/g and corresponded to total dynamic exchange capacity. As the number of sorption-desorption cycles increased, total dynamic exchange capacity gradually decreased. The efficiency of Sr-90 removal from real liquid radioactive waste streams has been evaluated.