黑曲霉孢子和菌丝吸附^(241)Am的研究

Biosorption of Radionuclide Americium-241 By A.niger Spore and Hyphae

作者研究了黑曲霉孢子和菌丝吸附2 4 1Am的可行性及各种反应条件对吸附的影响 .结果表明 :用黑曲霉孢子和菌丝处理2 4 1Am ,在起始浓度C0 为 5 .6～ 111MBq/L的范围内 ,吸附量W分别为 7.2～ 142 .4MBq/ g和 5 .2～ 10 6 .4MBq/ g(均为干重 ) ,两者的平均吸附率均高达96 % ,说明用黑曲霉孢子和菌丝处理2 4 1Am是可行的 .吸附反应在 1h左右达到平衡 ,反应温度15～ 4 5℃ ,最适吸附酸度分别为 pH 1～ 3和 pH 2～ 3,2 4 1Am浓度与吸附量均呈指数关系 ,符合Freundlich经验公式 .在高于2 4 1Am 2 0 0 0多倍的金、银存在下 ,对黑曲霉孢子和菌丝吸附2 4 1Am无明显影响 .黑曲霉孢子和菌丝对2 4

The biosorption of radionuclide 241Am from solution was studied by A.niger spore and hyphae, and the effects of the operational conditions on the treatment were investigated. The results showed the treatment by A.niger spore and hyphae were very efficient. An average of 96% of the total 241Am was removed from 241Am solutions of 5.6～111MBq/L(C 0), with adsorption capacities(W) of 7.2～142.4MBq/g biomass,5.2～106.5 MBq/g,respectively. The biosorption equilibrium was achieved within 1 h and the optimum pH value ranged 3 ～0.1mol/L HNO 3 and 3～2 for spore and hyphae of A.niger,respectively. No significant effects on 241Am biosorption were observed at 15℃～45℃, or challenged with containing Au 3+ or Ag +, even 2000 times above 241Am amount. The index relationship between concentrations and adsorption capacities of 241Am indicated that the 241Am biosorption by A.niger spore and hyphae obey to Freundlich adorption equation.The adsorption behavior of A.niger spore and hyphae were basically coincedent.