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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pH_5—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。
In this paper, the adsorption process of 508 resin and uranium solid-liquid interface was studied and its mechanism of uranium absorption was discussed from the aspects of adsorption kinetics, adsorption thermodynamics and the isoelectric point of the resin. The conclusions are as follows: Within the range of pH_5-7 , And the adsorption capacity of uranium was the highest. The adsorption isotherm fitted the Langmuir adsorption isotherm under the experimental conditions with the maximum adsorption capacity of 716mgU / m-dry resin. The adsorption reaction was endothermic with ΔH = 16.87kJ / mol. The adsorption exchange rate was mainly Controlled by liquid film diffusion; the isoelectric point of this resin is pH = 7.5. After uranium is adsorbed, the isoelectric point is shifted to pH = 5.7 and the adsorption of uranium is characteristic adsorption.