摘要
为研究地浸采铀工艺过程中Fe(OH)_3胶体对铀的吸附,利用在无水乙醇中制备的Fe(OH)_3胶体,研究了pH值、初始铀浓度及吸附时间等对Fe(OH)_3胶体吸附铀的影响。采用准一级、复合二级与Elovich动力学模型对数据进行了动力学计算与分析,结果表明Elovich动力学方程更适合描述Fe(OH)_3胶体对铀的吸附行为。采用Freundlich与Langmuir等温吸附方程对实验数据进行了热力学分析和拟合,结果表明Freundlich模型更适合描述Fe(OH)_3胶体对铀的吸附行为。综合两种等温吸附方程,推测Fe(OH)_3胶体对铀的吸附属于不均匀表面的单层物理吸附。根据激光粒度分析与SEM分析结果推测,Fe(OH)_3胶体对铀具有较强的吸附性能,吸附主要是表面吸附。
In order to study the adsorption of uranium on Fe（OH）-3colloid in situ leaching of uranium,the Fe（OH）-3colloid was prepared in absolute ethanol,and the adsorption performance of uranium on Fe（OH）-3colloid was detected.The effects of pH value,initial uranium concentration,and the contact time were analyzed.As for the adsorption dynamics,the pseudo-first-order,composite-second-order and Elovich dynamic models were comparatively calculated and discussed.The results show that the Elovich dynamic model is fit to describe the adsorption of uranium on Fe（OH）-3colloids.As for the adsorption thermodynamics,the Freundlich and Langmuir adsorption isotherm models were applied to analyze and fit the experimental equilibrium data.It is found that the equilibrium data agree well with the Freundlich model.In conclusion,the adsorption of uranium on Fe（OH）-3colloid belongs to the single layer physical adsorption of uneven surface.The laser particle size and SEM analysis results reveal that the Fe（OH）-3colloids show a good adsorption performance,and the surface adsorption takes precedence in the adsorption process.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2016年第1期39-45,共7页
Atomic Energy Science and Technology
基金
国家自然科学基金资助项目(51154003)
