【作者】 丁聪聪； 刘俊； 胡小龙； 刘宁； 杨远友； 唐军； 杨吉军； 廖家莉；

【Author】 DING Cong-cong~(1,2),LIU Jun~3,HU Xiao-long~3, LIU Ning~1,YANG Yuan-you~1,TANG Jun~1, YANG Ji-jun~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.College of Life Science,Sichuan University,Chengdu 610064,China;) (3.College of Nuclear Science and Technology,Sichuan University,Chengdu 610064,China)

【机构】 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； 四川大学生命学院； 四川大学核科学与技术学院；

【摘要】 利用传统的平板菌落计数法,对拟作为极低放废物填埋现场的土壤的不同深度的(表层,1.5 m,2.5 m,3.5 m)微生物做了一个数量的统计分布。筛选了从3.5 m深的土层分离出的两种真菌F1、F2对U进行吸附行为研究,考察了pH、吸附时间、菌体量、U初始浓度、温度等条件对吸附的影响。通过这些条件的研究得出F1和F2对铀均有明显的吸附,但规律稍有不同,F1对U的吸附率在pH=5时达到最高,吸附率为90%,F2对U的吸附率在pH=4时达到最高,吸附率为97%;F1和F2对铀的吸附动力学符合假二级动力学模型,F1对铀的吸附反应2 h达到平衡,F2需要12h达到平衡;在研究的铀的初始范围内(0-100 mg/l)F1对铀的等温吸附符合Freundlich经验方程,而F2对铀的等温吸附更好的符合Langmuir模型;在5～60℃范围内,F1随着温度的升高对铀的吸附率呈缓慢下降。更多还原

【Abstract】 The quantitative distribution of microbial species of different layers(surface layer、1.5 m,2.5 m,3.5 m) isolated from intended as a low-level radioactive landfill site has been investigated using traditional plate colony count.Biosorption of U using two kinds of fungi isolated from 3.5 m layer is studied.Solution pH value,biosorption time,adsorbent dosage,U initial concentration and temperature are researched.The results showed that F1,F2 had marked absorption effect on U,but the interaction regular pattern between F1,F2 and U was different.The maximum removal rate 90%was gained for F1 at pH5,while the maximum removal rate 97%was got for F2 at pH4;The kinetics adsorption model of both F1 and F2 followed pseudo-second order model.Biosorption equilibrium of F1 was established in 2 h, While F2 needed 12 h to establish biosorpion equilibriun;In the studied concentratin range of uranium,the isotherms biosorption process of F1 conformed to Freundlich equation,while F2 fitted well to Langmuir equation.The adsorption rate of F1 presented a slow pace of decline in the range of 5℃-60℃.更多还原