Desorption of Cs+ from contaminated biotite with a low molecular mass organic acid

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Abstract Desorption of Cs+ from biotite using various organic and inorganic acids was evaluated considering the removal of Cs+ from contaminated soils. Oxalic acid was most effective in desorbing Cs+ from biotite. The desorption efficiency increased with heating temperature and time, and 94.8% desorption efficiency was obtained at 85 °C after 4 h. The contents of Al, Fe, and Mg in biotite decreased with the increasing heating time, and these contents decreased by 50%, 91%, and 95%, respectively after 4 h of oxalic acid treatment. In addition, X-ray diffraction could not detect biotite peaks after oxalic acid treatment. The results indicate that oxalic acid desorbed Cs+ from biotite by decomposing the biotite structure. Moreover, a desorption efficiency of Cs+ from biotite of > 95% was obtained using oxalic acid treatment even in the biotite with aging of 3 months. Since the research on effective desorption of Cs+ around the boiling point of water is limited, the results of this study are expected to contribute to the development of low energy and environment-friendly remediation of soil contaminated with radioactive species.

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