无机盐对油水界面电性的影响分析

Analysis of Influence of Inorganic Salts on Electrical Properties of Oil-water Interface

在油水体系中,油水界面处油滴粒子从水溶液中选择性地吸附水中的OH-,从而使界面带电。利用基于静电感应原理的油水界面检测系统,分别检测了水相为纯水、0. 05 M氯化钾、0. 05 M氯化钙、0. 05 M氯化铁的油水体系中油水界面的Zeta电位。实验结果表明,水相中的无机盐会压缩双电层,使油水界面的Zeta电位降低,而且无机盐离子的化合价越高,对油水界面的Zeta电位的影响越大。这对于油水界面性质和油水分离技术的研究具有重要的指导意义。

In the oil-water system, the oil droplets at the oil- water interface selectively adsorb OH - from the aqueous solution, thereby charging the interface. The oil-water interface detection system based on the principle of electrostatic induction was used to detect the zeta potential at the oil-water interface in the oil-water system with pure water, 0.05 M potassium chloride, 0.05 M calcium chloride and 0.05 M ferric chloride. The experimental results showed that the inorganic salt in the aqueous phase compressed the electric double layer, which reduced the zeta potential at the oil-water interface. The higher the valence of the inorganic salt ions, the greater the influence on the zeta potential at the oil-water interface. This had important guiding significance for the study of oil-water interface properties and oil-water separation technology.