抗逆性细菌解淀粉芽孢杆菌对U(VI)的生物吸附动力学及平衡
Kinetic and equilibrium of U(VI) biosorption onto the resistant bacterium Bacillus amyloliquefaciens.
作者信息
Liu Lei, Liu Jing, Liu Xiaoting, Dai Chengwei, Zhang Zexin, Song Wencheng, Chu Yannan
机构信息
Anhui Province Key Laboratory of Medical Physics and Technology, Center of Medical Physics and Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, PR China; University of Science and Technology of China, Hefei, 230026, PR China; School of Environment and Chemical Engineering, Anhui Vocational and Technical College, Hefei, 230011, PR China.
Anhui Province Key Laboratory of Medical Physics and Technology, Center of Medical Physics and Technology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, PR China.
出版信息
J Environ Radioact. 2019 Jul;203:117-124. doi: 10.1016/j.jenvrad.2019.03.008. Epub 2019 Mar 18.
This study evaluated U(VI) biosorption properties by the resistant bacterium, Bacillus amyloliquefaciens, which was isolated from the soils with residual radionuclides. The effect of biosorption factors (uptake time, pH, ionic concentration, biosorbent dosage and temperature) on U(VI) removal was determined by batch experiments. The uptake processes were characterized by using SEM, FTIR, and XPS. The experimental data of U(VI) biosorption were fitted by the pseudo-second-order. The maximum uptake capacity was 179.5 mg/g at pH 6.0 by Langmuir model. The thermodynamic results: ΔG, ΔH and ΔS for uptake processes were calculated as -6.359 kJ/mol, 14.20 kJ/mol and 67.19 J/mol/K, respectively. The results showed that the biosorption of Bacillus amyloliquefaciens will be an ideal method to remove radionuclides.
本研究评估了从含有残留放射性核素的土壤中分离出的抗辐射细菌解淀粉芽孢杆菌对U(VI)的生物吸附特性。通过批量实验确定了生物吸附因素（吸附时间、pH值、离子浓度、生物吸附剂用量和温度）对U(VI)去除的影响。利用扫描电子显微镜（SEM）、傅里叶变换红外光谱（FTIR）和X射线光电子能谱（XPS）对吸附过程进行了表征。U(VI)生物吸附的实验数据采用准二级动力学模型进行拟合。根据朗缪尔模型，在pH 6.0时最大吸附容量为179.5 mg/g。计算出吸附过程的热力学结果：ΔG、ΔH和ΔS分别为-6.359 kJ/mol、14.20 kJ/mol和67.19 J/mol/K。结果表明，解淀粉芽孢杆菌的生物吸附将是去除放射性核素的理想方法。
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