Development of adsorbents for the removal of cesium using biomass wastes

以市售柿子单宁提取液、绿色茶叶粉、柿子单宁提取后的废弃物和生物柴油提取后的微藻废弃物为原料，制备了对铯（I）具有高选择性的新型生物质吸附剂。所有这些吸附剂对铯（I）表现出接近于沸石A（市售的铯（I）吸附剂）的高吸附容量。以橙子汁渣为原料制备了对锶（II）具有高选择性的新型吸附剂。提出了采用这些新型生物吸附剂进行锶（II）去除和铯（I）去除的新工艺。

Novel biomass adsorbents which exhibit high selectivity for cesium(I) were prepared from commercially available persimmon tannin extract, powdered green tea leaves and persimmon waste after extracting persimmon tannin as well as microalgal waste after extracting bio-diesel oil. All of these adsorbents exhibit high adsorption capacity for cesium(I) close to zeolite A, commercially available adsorbent for cesium(I). Further, also new adsorbent which exhibited high selectivity for strontium(II) was prepared from orange juice residue. New removal process consisting of strontium(II) removal followed by cesium(I) removal was proposed employing these new bio-adsorbents.