核电厂关键核素在海洋沉积物上的吸附动力学

为研究核电厂关键核素在海洋沉积物上的吸附动力学过程，通过静态批式实验获得三种沉积物对核素⁹⁰Sr、¹³⁷Cs、⁵⁴Mn、⁶⁰Co的吸附动力学曲线，采用多级吸附动力学模型对实验数据进行拟合，得出以下结论：⁹⁰Sr、¹³⁷Cs、⁵⁴Mn、⁶⁰Co在三种沉积物上的分配系数（Kd）分别为1.8~3.0、71.5~128.0、23.1~167.0、160.0~188.0 mL/g；采用一级吸附动力学模型所得Kd与实验所得Kd较为符合，说明4种核素在三种沉积物上的吸附行为可由一级吸附点位进行表征；获得了各样品的吸附动力学关键参数，包括吸附速率常数、解吸速率常数及单位最大吸附量。

Adsorption Kinetics of Key Nuclides From Nuclear Power Plant on Marine Sediments

In order to study the adsorption kinetics of key nuclides from nuclear power plants on marine sediments, the adsorption kinetics curves of ⁹⁰Sr, ¹³⁷Cs, ⁵⁴Mn and ⁶⁰Co on three kinds of sediments were obtained by static batch experiments. The experimental data were fitted by multi-stage adsorption kinetics model. The distribution coefficients(Kd) of ⁹⁰Sr, ¹³⁷Cs, 54Mn and ⁶⁰Co on the three sediments are 1.8-3.0, 71.5-128.0, 23.1-167.0, 160.0-188.0 mL/g, respectively. The Kd is good agreement with the experimental data, indicating that the adsorption behavior of three sediments can be characterized by the first-order adsorption sites. The key parameters of adsorption kinetics were obtained, including adsorption rate constant, desorption rate constant and maximum adsorption capacity per unit.