Desorption Behavior of Cs from Clay Minerals by Thermal Heating in a Vacuum: Analyses by Thermal Desorption Spectroscopy and Synchrotron Radiation X-ray Photoelectron Spectroscopy

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  • 真空加熱による粘土鉱物からのセシウム脱離挙動：放射光を用いたX線光電子分光法及び昇温脱離法による分析
  • シンクウ カネツ ニ ヨル ネンド コウブツ カラ ノ セシウム ダツリ キョドウ : ホウシャコウ オ モチイタ Xセン コウデンシ ブンコウホウ オヨビショウオン ダツリホウ ニ ヨル ブンセキ

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Abstract

Abstract After the Fukushima nuclear plant accident, radioactive cesium was strongly fixed to clay minerals in the soil. The development of a method to remove radiocesium from soil is important. In this paper, we propose a decontamination method to vaporize Cs at low temperature by heating Cs-adsorbed vermiculite in vacuum. When Cs-adsorbed vermiculite was heated at a constant ramp rate, a desorption peak was observed at 680°C. The desorption peak temperature fell to 500°C when an equal amount of NaCl/CaCl2 mixed salt was added in Cs-adsorbed vermiculite. Furthermore, desorption peak was observed at 400°C. The quantity and chemical states of the Cs in the vermiculite before and after heating were compared using X-ray photoelectron spectroscopy. Approximately 40% of the cesium was removed by heating at 800°C for three minutes when only Cs-adsorbed vermiculite was heated. Approximately 70% of the cesium was removed by heating at 450°C for three minutes when Cs-adsorbed vermiculite was heated with NaCl/CaCl2 mixed salts. Based on these results, this method is expected to reduce the temperature and increase the efficiency for cesium removal from clay minerals.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 65 (5), 259-266, 2016

    The Japan Society for Analytical Chemistry

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