For removal and long term storage of radioactive cesium ion (Cs +) which diffused into the environment by the Fukushima Daiichi Nuclear Power Plant accident, pollucite (POL: Cs 16 Si 32 Al 16 O 96 •nH 2 O) which is a cesium containing mineral was synthesized by using a solution containing sodium silicate, sodium aluminate and cesium chloride, and the optimum synthesis condition for Cs + removal and insolubilization was determined. POL synthesis was carried out at 200°C for 24 h, in the Si/Al molar ratio range of 0.5 to 7.0 and in the Cs + concentration range of 10 to 5000 mg dm-3. The product was characterized using X-ray diffractometer and scanning electron microscopy. After synthesis of POL, the concentration of Cs + remained in the solution which was not incorporated into POL was determined by using atomic adsorption spectrophotometer. The Cs + dissolution experiment was carried out with the synthesized product in a 0.6 M NaCl solution for 24 h. It was revealed that excellent Cs + removal and insolubilization were confirmed by the formation of POL with Si/Al molar ratio of 2.0 and 2.5 in the mixed solution adjusted to 2500 mg dm-3 Cs + concentration. In addition, even in low Cs + concentrations (100 mg dm-3), the excellent Cs + removal and insolubilization were achieved with POL having Si/Al molar ratio of 2.0. Moreover, if Si/Al molar ratio was adjusted to be 2.0 to 2.5, Cs + (100 mg dm-3 to 2500 mg dm-3) could remove effectively and store stably long time.
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