EXAFS investigation of strontium adsorption onto weathered biotite

Abstract

The efficiency of the sorption of Sr2+ on weathered biotite (WB), a type of clay mineral, was investigated. Removal of Sr2+ and Cs+ is important in the treatment of contaminated water from the 1F accident, which is one of the radionuclide waste treatment problems. We focused on developing an adsorption method for Sr ions using WB, which is abundant in Fukushima. Applying a molten salt treatment, the amount of sorbed Sr2+ simply increased as the added mass ratio of strontium chloride (SrCl2) increased from 1:1, 1:5, and 1:10 for the onefold, fivefold, and tenfold additions of SrCl2, respectively. Then, the crystal structure of WB as an adsorbent was evaluated by x-ray diffraction (XRD) analysis. Thus, it was observed that the WB retained its original crystal structure even after the sorption of Sr2+. Extended x-ray absorption fine structure (EXAFS) analysis was performed to investigate the local sorption structure of Sr2+ in the WB. The results revealed that Sr2+ was preferentially sorbed into the SiO4 and Al2O3 layers when Sr2+ was in the low mass ratio, whereas it was mainly sorbed into the SiO4 layer when the ratio was high.

Sustainable thermoelectric materials: Utilizing Fukushima weathered biotite via molten salt treatment

“…We have demonstrated the feasibility of synthesizing various crystals from WB using the molten-salt method with salt as the intercalation between layers. 21,22 The WB sample has undergone crushing, classification, and hydraulic operations and has a particle size of about 10 μm. To explore the potential of creating thermoelectric materials from soil clay minerals, samples were prepared by mixing WB with molten salts NaCl-CaCl 2 and KCl-CaCl 2 at a mass ratio of 1:1.…”