微生物吸附~(241)Am行为的模拟研究

doi:10.7538/yzk.2002.36.03.0222

微生物吸附~(241)Am行为的模拟研究

Biosorption of ~(241)Am by Microorganism

YANG Yuan you 1, LIU Ning 1, LUO Shun zhong 2, ZHANG Tai ming 2, JIN Jian nan 1, LIAO Jia li 1 (1 Key Laboratory of Radiation Physics and Technology of Education Ministry of China, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064, China; 2.Institute of

摘要

摘要: 研究了黑曲霉、少根根霉、假丝酵母对2 4 1Am的吸附行为以及实验条件对吸附的影响。结果表明 :用黑曲霉、少根根霉、假丝酵母处理2 4 1Am, 起始浓度C(2 4 1Am)在 5 6～ 1 1 1MBq/L范围内, 它们的吸附量W分别为 6 2～ 1 2 4 4、4 2～ 79 4、6 6～ 63 4MBq/g, 表明用黑曲霉、少根根霉、假丝酵母处理2 4 1Am是可行的。吸附反应约经 2h达到平衡, 反应温度在 1 5～ 45℃内对吸附影响不大, 黑曲霉在 pH =1～ 3、少根根霉在pH =0. 3～ 3、假丝酵母在 pH =2时, 吸附明显。2 4 1Am液相浓度与黑曲霉、少根根霉的吸附量间的关系符合Freundlich经验公式, 假丝酵母则符合Langmuir经验公式。 2 0 0 0多倍Au3+和Ag+的存在对黑曲霉、少根根霉、假丝酵母吸附2 4 1Am无明显影响

Abstract: The biosorption of 241 Am on A.niger, R.arrihizus and Candida albicams from aqueous solution, and the effects of the experimental conditions on the biosorption are investigated by the batch technique. The experimental results show that all the microorganism above are very efficient as the sorbent. The biosorption equilibrium time is 2 h and the optimum pH ranges 1～3. No significant differences on 241 Am biosorption are observed at the temperature of 15～45 ℃, or in the presence and absence of Au 3+ or Ag +. The relationship between concentrations of 241 Am in aqueous solutions and adsorption capacities of 241 Am can be described by the Freundlich adsorption equation on A. niger and R.arrihizus,whileas it can be done by the Langmuir adsorption equation on Candida albicams.

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