色谱法研究杂多酸——Ⅵ.12—钨硼酸根离子溶液中降解反应的研究

Research on Heteropoly Anions with Chromatography Ⅵ. The Study of Decomposition Reaction of 12-Tungstoborate in Solution

本文将胶束液相色谱用于α-BW_(12)O_(40)^(5-)溶液中降解反应的研究,首次发现α-BW_(12)O_(40)^(5-)降解存在两个过程,第一步为α-BW_(12)O_(40)^(5-)向其异构体转化的快速平衡反应,第二步为该异构体的缓慢降解.实验测定了杂多酸离子浓度、pH值、无机盐浓度、温度对降解反应的影响,得到第一步反应的平衡表达式和第二步反应的速率方程式,推断了α-BW_(12)O_(40)^(5-)降解反应的机理.

The decomposition reaction of heteropoly anion α-BW12O405- in solution was studied with micellar liquid chromagraphy. It was found for the first time that the decomposition reaction of α-BW12O405- possesses two steps, the first is the fast interconversion equilibrium between α-BW12O405-and its isomer and the second is that the isomer dissociates slowly. By experiment, the influence of the concentration of heteropoly anion, the pH value, the concentration of inorganic salt and the temperature on the decomposition reaction were investigated and the equilibrium equation of the first step of the reaction and the equation of the reaction kinetics of the second were obtained. Finally, the possible mechanism of the decomposion of α-BW12O405- was discussed.