【摘要】 <正> 在反应动力学中,活化能是一种比较基本的数据,它可以用于确定过程的动力学特性,和研究过程的机制。因此,活化能的测定是动力学研究的一个重要方面。其测定方法通常是以过程的动力学方程为基础,测定不同温度下的反应速率,并根据Arrhenius方程式计算得出。更多还原

【Abstract】 Some previous works and our experimental data have shown that the adsorption process of Uranium on the titanic gel in sea water could be treated by using langmuir’s theory of monolayer adsorption.A method for determining the activation energy of adsorption is proposed on the basis of this theory with some simplifying assumptions in connection with the characteristics of the adsorptionprocess——low velocity of adsorption, long time to reach equilibrium, and lowpercentage extraction. By use of this method, the activation energy of uranium adsorbed on the titanic gel in the natural sea water has been determined and found to be about 10 kcal./molThe essential point of this method is that, after a given short time of adsorption t,the adsorption capacity X is proportional to the adsorption velocity constant K, for different temperatures, is connection with the Arrhenius equatipn; this equation can be used for the determination of the activation energy of adsorption from the adsorption capacity X after a definite short time of contact with sea water, thus enables us to determine the activation energy of the adsorption process. It seems that this simple and useful method can be extended to the measurement of activation energy of adsorption of some other micro-elements in sea water.更多还原