过渡金属离子在焦磷锑酸锡上的离子交换反应动力学研究  

Kinetics of Ion Exchange Reaction of Transition Metals on Stannic Antimonylpyrophosphate Cation Exchanger

作　　者：郭鹏[1] 刘锦春[1] 刘良斌[1] 程介克[1] 

机构地区：[1]武汉大学化学系,430072

出　　处：《高等学校化学学报》1991年第2期235-238,共4页Chemical Journal of Chinese Universities

摘　　要：应用Nernst-Planck方程研究了过渡金属离子CO^(2+)、Cu(2+)、Zn(2+)和Cd(2+)在焦磷锑酸锡上的离子交换反应动力学.当金属离子浓度大于或等于0.050 mol/L时.其交换反应速率基本上不受金属离子浓度的影响,离子交换受粒间扩散过程控制.通过求解Nernst-Planck方程得出了自扩散系数、活化能和活化熵,这些动力学参数的获得有助于揭示其离子交换机理。The Nernst-Planck equations were applied to the study of the ion exchange reaction kinetics for the transition metal ions(Co2+, Cu2+, Zn2+ and Cd2+) with H+-ions on stannic antimonylpy-rophosphate(SSbPP). Under the control of particle diffusion, the rate of exchange has been found to be independent of the metal ion concentration at and above 0. 050 mol/L. The self-diffusion coefficients (D0) , the activation energies(Ea) and the entropies of activation (△S*) of transition metal ions have also been calculated by solving Nernst-Planck equations with Apple- II computer. These parameters are useful for predicting the ion exchange mechanism taking place on SSbPP.

关 键 词：离子 SSbPP 离子交换 过渡元素 

分 类 号：O614.8[理学—无机化学]