放射性核素90Sr在柱撑蒙脱石和蒙脱石表面的吸附动力学研究  

Adsorption kinetics of radionuclide 90Sr on column-supported montmorillonite and montmorillonite surfaces

作　　者：周瑞霞 施和平[1,2] 张艳茹 肖国平 刘丽君[3] 石磊[4] 李金英[4] Zhou Ruixia;Shi Heping;Zhang Yanru;Xiao Guoping;Liu Lijun;Shi Lei;Li Jinying(College of Science,Inner Mongolia Agricultural University,Hohhot 010018;Inner Mongolia Key Laboratory of Soil Quality and Nutrient Resources,Hohhot 010018;Institute of Radiochemistry,China Institute of Atomic Energy,Beijing 102413;China National Nuclear Construction Corporation,Beijing 100037)

机构地区：[1]内蒙古农业大学理学院,呼和浩特010018 [2]内蒙古土壤质量与养分资源重点实验室,呼和浩特010018 [3]中国原子能科学研究院放射化学研究所,北京102413 [4]中国核工业建设集团公司,北京100037

出　　处：《化工新型材料》2023年第11期207-211,共5页New Chemical Materials

基　　金：国家自然科学基金(21167010)。

摘　　要：采用静态吸附法研究了P-Al-MMT和Ca-MMT对Sr^(2+)的吸附特征和吸附动力学机制,探究了吸附时间、锶离子浓度、pH、温度对吸附的影响。首先对P-Al-MMT和Ca-MMT进行了表征,并对吸附过程进行等温吸附方程和动力学方程拟合。结果表明:P-Al-MMT和Ca-MMT的表面均匀,对Sr^(2+)的吸附属于单分子层吸附,等温吸附方程符合Langmuir模型;应用Elovich、双常数速率、抛物线扩散和一级反应动力学模型拟合了P-Al-MMT和Ca-MMT吸附Sr^(2+)的动力学曲线,发现其对Sr^(2+)的吸附过程都是非均相扩散过程,都符合Elovich模型。P-Al-MMT和Ca-MMT对Sr^(2+)的吸附过程随pH的增大而增大,也随温度的升高而增大。In this paper,static adsorption method was used to study adsorption characteristics and the adsorption kinetics mechanisms of strontium ions on P-Al-MMT and Ca-MMT.The effects of adsorption time,strontium ion concentration,pH and temperature on the adsorption of P-Al-MMT and Ca-MMT were explored.P-Al-MMT and Ca-MMT were characterized,and the adsorption process were fitted with isothermal adsorption equation and kinetic equation.Th results showed that the surfaces of P-Al-MMT and Ca-MMT were relatively uniform,indicating that the isothermal equilibrium adsorption belonged to monolayer adsorption.The isothermal adsorption equation of P-Al-MMT and Ca-MMT for strontium ions was in line with Langmuir model.The adsorption kinetics curves of strontium ions on P-Al-MMT and Ca-MMT were fitted by Elovich model,double constant rate model,parabolic diffusion model and first-order reaction kinetic model.The adsorption processes of P-Al-MMT and Ca-MMT for strontium ions were non-homogeneous diffusion process,and both were in accordance with Elovich model.The adsorption process of Sr^(2+)by P-Al-MMT and Ca-MMT increased with the increase of pH and temperature.

关 键 词：蒙脱石 柱撑蒙脱石 动力学 拟合 

分 类 号：O647.32[理学—物理化学]