固定化少根根霉吸附^(241)Am的研究  

BIOSORPTION OF ^(241)Am BY IMMOBILIZED R.ARRIHIZUS

作　　者：廖家莉[1] 杨远友[2] 罗顺忠[2] 刘宁[1] 张太明[2] 金建南[1] 陈立[3] 

机构地区：[1]四川大学原子核科学技术研究所辐射物理及技术教育部重点实验室,四川成都610064 [2]中国工程物理研究院核物理与化学研究所,四川绵阳621900 [3]四川省辐射环境管理监测中心站,四川成都610031

出　　处：《核化学与放射化学》2002年第4期227-231,共5页Journal of Nuclear and Radiochemistry

摘　　要：以海藻酸钙为载体包埋固定少根根霉 ,进行了2 4 1Am(Ⅲ )的吸附研究。结果表明 :固定化少根根霉在 pH=1～ 7范围内 ,对2 4 1Am具有明显的吸附能力 ,吸附率在 94 %以上 ;连续重复使用 8次 ,吸附率基本不变 ,达97%以上 ,且仍未达到饱和吸附 (吸附量为 88 6kBq/ g) ;静态接触 2h,吸附基本达到平衡 ;在 1 5～ 4 5℃范围内 ,温度对固定化少根根霉的吸附行为无显著影响 ;EDTA(乙二胺四乙酸 )饱和溶液和 2mol/LHNO3均可将吸附在少根根霉上的2 4 1Am解吸下来 ,解吸率分别为 95 %和 98%。The adsorption of radionuclide 241Am by immobilized R.arrihizus from aqueous solutions and the effects of the various experimental conditions on the 241Am adsorption are studied. The results indicate that the biosorption is very efficient in the range of pH=1～7,with adsorption rate of more than 94% for 241Am. The immobilized R.arrihizus, even used repeatedly for 8 times, can adsorb more than 97% of the total 241Am in solutions. At the time, the adsorption capacity for 241Am has not reached saturation yet. The biosorption equilibrium is achieved within 2 h. No significant differences in 241Am biosorption are observed at 15～45 ℃. However,95% or 98% of the absorbed 241Am are released by EDTA solution or 2 mol/L HNO 3, respectively.

关 键 词：吸附 固定化 少根根霉 吸附率 镅241 放射性废液 微生物处理 

分 类 号：TL941.1[核科学技术—辐射防护及环境保护]