LSC-100螯合树脂对铕的吸附性能研究

Adsorption Performance of LSC-100 Chelating Resin for Europium

采用静态吸附方法和动态吸附方法进行LSC-100螯合树脂吸附Eu(Ⅲ)的相关研究,并且运用动力学、热力学、吸附等温模型拟合实验结果,结合FT-IR、EDS、SEM对吸附前后树脂形态结构进行了表征,研究其吸附机理。结果表明,吸附符合准二级动力学模型和Langmuir吸附等温模型;吸附过程为吸热、熵增加的过程。动态吸附实验发现,265倍床体积时,树脂达到饱和吸附;用2 mol·L^(-1)的HCl溶液解吸,床体积为2 m L,解吸率为97.7%。FT-IR和SEM表征表明,Eu^(3+)与C■O键发生了配位,并且树脂吸附后发生皱缩;EDS显示Eu(Ⅲ)被吸附。LSC-100螯合树脂对Eu(Ⅲ)具有较好的吸附性能,对高分子螯合剂的研究做出了补充,同时也对其他稀土元素的分离研究提供了参考。

The static adsorption method and dynamic adsorption method were studied to adsorb Eu (Ⅲ) by LSC-100 chelating resin.The kinetics,thermodynamics and adsorption isotherm model were used to fit the experimental results.The morphology and structure of the resin before and after adsorption were characterized by FT-IR,EDS,SEM,and the adsorption mechanism were studied.The results show that the adsorption is in accordance with the quasi-two-level dynamic model and the Langmuir adsorption isotherm model,and the adsorption is the process of heat absorption and thermal expansion.The dynamic adsorption experiment showed that the resin reached saturated adsorption when the solution is 265 times the volume of the resin,and the bed volume was 2 m L and the analytical rate was 97.7%when analyzed with 2 mol/L HCl solution.FT-IR and SEM characterization showed that Eu^(3+)coordinated with C■O bond and wrinkled after adsorption,and EDS showed that Eu(Ⅲ) was adsorbed.LSC-100 chelating resin has good adsorption properties for Eu (Ⅲ),which complements the study of polymer chelating agents and provides a reference for the separation of other rare earth elements.