【摘要】 本文研究了508树脂与铀的固液界面的吸附过程,并从吸附动力学、吸附热力学和树脂的等电点几方面探讨了它的吸铀机理,得到如下结论:在pH₅—7的范围内,铀吸附量最大;吸附等温线在实验条件下符合Langmuir吸附等温式,最大吸附量可达716mgU/m-干树脂;吸附反应是吸热反应,△H=16.87kJ/mol;吸附交换速率主要受液膜扩散控制;该树脂的等电点为pH=7.5,吸附铀以后,等电点移至pH=5.7,对铀的吸附是特性吸附。更多还原

【Abstract】 In this paper the adsorption process of uranium by Resin 508 at the solid-liquid interface was investigated and the mechanism of uranium adsorption including adsorption dynamics, adsorption thermodynamics and isoelectric point of resin was studied.The results are as follows: The maximum of uranium adsorption is attained at pH5-7;Urani-um adsorption isotherm by Resin 508 in experimental conditions agrees with Langmuir’s adsorption isotherm, the maximum of uranium adsorbed (Vm)is 716 mgU/g-dried resin; The adsorption of uranium by Resin 508 is an endothermic reaction and △H=16.87kJ /mol; The exchange-adsorption rate is mainly controlled by liquid film diffusion; The isoelectric points of Resin 508 before and after uranium adsorption are found to be pH 7.5 and pH 5.7 respectively. It is a specific adsorption for uranium.更多还原