期刊论文

Xia, L.-S.

中文

原子能科学技术

1000-6931

2010

44

3

278-284

国家自然科学基金资助项目（10675059）； 湖南省高等学校科研委托项目资助（09w025）；

本校为第一且通讯机构

通过静态吸附实验,研究了UO_2~(2+)在榕树叶上的吸附行为,从热力学和动力学方面对吸附过程进行了分析,并通过红外光谱、扫描电镜探讨了吸附机理. 结果表明:UO_2~(2+)在榕树叶上的吸附是吸热过程,符合Freundlich等温吸附方程,相关系数达0.99以上;表面吸附是动力学控制的主要步骤,吸附动力学过程可用准二级吸附速率方程来描述,相关系数达0.999 8;榕树叶吸附铀是自发的、吸热的吸附反应;榕树叶对铀的吸附使细胞的表面形态发生了改变,在榕树叶吸附铀的过程中,UO_2~(2+)主要与细胞表面的--OH、C-O、P--O及Si O等基团螯合,形成配合物,因此,榕树叶吸附铀的机理表现为表面络合吸附机理

The adsorption behavior of uranium on banyan leaves was studied with static experiments. The adsorption process was analyzed in terms of thermodynamics and kinetics, and the adsorption mechanism was analyzed with FTIR and SEM. In the studied condition, the equilibrium adsorption data fit to Freundlich isotherms, with a relation coefficient greater than 0.99. The adsorption of uranium on banyan leaves is an endothermic process. Kinetic analysis shows that the adsorption rate is mainly controlled by surface adsorption. The process of adsorption can be described by an equation of Pseudo 2nd-order...