新型磁性螯合聚合物的合成及其对铀吸附性能的研究

Study on Adsorption Property of Uranium Based on Novel Magnetic Chelating Polymer

合成了一种新型的、具有高吸附量和机械强度且易于分离的双偕胺肟基聚合物/Fe3O4@SiO2吸附剂,通过静态吸附实验,研究了pH值、固液比、吸附时间、溶液初始浓度等因素对吸附剂吸附铀的影响,并探讨了吸附过程的热力学和动力学。结果表明,吸附剂对铀的吸附量随吸附剂用量、吸附时间及铀酰离子初始浓度的增加而增加,但当这些因素达到一定值时,吸附达到平衡。最佳吸附条件为:pH=5、固液比为0.6g/L、吸附时间为90min、铀溶液初始浓度为100mg/L,在此条件下其饱和吸附量可达到160mg/g。吸附剂对铀的吸附遵循Langmuir等温吸附线,符合准二级动力学方程。

A new type,high adsorption capacity and mechanical strength and easy separation of dual amidoxime group polymer/Fe3O4@SiO2 adsorbent was synthesized.By static adsorption experiments,the effect of pH,solid-liquid ratio,adsorption time and initial concentration of uranium on the adsorption of uranium were studied.The thermodynamics and kinetics of adsorption process and the relevant equation for matching were also discussed.The results show that the adsorption capacity for uranium increases with adsorbent amount,adsorption time and initial concentration of uranium,but when these factors reach a certain value,the adsorption process reaches equilibrium.The experimental results show that the optimal pH is 5,the optimal solid-liquid ratio is 0.6g/L,the adsorption is basically balanced at 90 min and the initial concentration of uranium is100mg/L.Under this condition,the saturated adsorption capacity can reach 160mg/g.The adsorption of uranium on adsorbent follows Langmuir adsorption isotherm,and is in line with quasi-second order kinetic equation.