过渡金属离子在焦磷钨酸锡上的离子交换反应动力学研究  

Kinetics of Ion Exchange Reaction of Transition Metal Ions on Stannic Tungstopyrophosphate

作　　者：刘锦春[1] 郭鹏[1] 张钦 刘良斌[1] 程介克[1] 

机构地区：[1]武汉大学化学系,武汉430072

出　　处：《分析试验室》1991年第2期1-3,共3页Chinese Journal of Analysis Laboratory

摘　　要：本文应用Nernst-Planck方程研究了过渡金属离子Mn(Ⅱ)、Co(Ⅱ)、Ni(Ⅱ)、Cu(Ⅱ)、Zn(Ⅱ)、和Cd(Ⅱ)在焦磷钨酸锡上的离子交换反应动力学。在粒子扩散控制的条件下,当[M^(2+)]≥0.010mol/L时,其交换反应速率基本上不受金属离子浓度的影响.利用Apple-Ⅱ微机求解Nernst—Planck方程获得了自扩散系数、活化能和活化熵等动力学参数。这些参数的获得有助于揭示其离子交换机理。The Nernst—Planck equations have been applied to study the ion exchange reaction kinetics for the transition metal ions [Mn(Ⅱ), Co(Ⅱ), Ni(Ⅱ), Cu(Ⅱ), Zn(Ⅱ), and Cd (Ⅱ)] on stannic tungstopyrophosphate. Under the control of particle diffusion, it was found that the rate of ion exchange reaction would be independent of the metal ion concentration at and above 0. 010 mol/L. The selfdiffusion coefficients (D_0), the activation energies (E_0) and the entropics of activation(△S~*) for transition metal ions were obtained by solving Nernst-Planck equations with an Apple—Ⅱ computer.

关 键 词：过渡元素 离子交换反应 焦磷钨酸锡 

分 类 号：O614[理学—无机化学]