不同稀释剂中HDEHP的界面性质研究

用滴体积法研究了HDEHP在不同稀释剂-0.05mol.dm^-^3(N2, Na2)SO4(pH=2.40)体系中的界面性质, 认为吸附于液-液界面的是单体HDEHP分子, 得到了各体系中HDEHP的Cmin, Tmax, Ai以及△Gad等界面吸附参数。HDEHP在不同稀释剂体系中的界面活性顺序为: 脂肪烃>芳香烃>氯仿>甲基异丁基酮, 这种变化主要是在体相中和界面上稀释剂与萃取剂、界面上的萃取剂及稀释剂与界面层水之间分子间相互作用的结果。同时讨论了HDEHP在不同稀释剂中的萃取动力学机理。

Effect of diluents on the interfacial properties of HDEHP

The interfacial properties of HDEHP in different diluent -0.05mol/L(H2, Na2)SO4(pH=2.40) systems have been studied with the drop method. The interfacial parameters, Cmin, Tmax, Ai and △Gad, of HDEHP have been obtained. It was suggested that the monomeric HDEHP molecule was the species absorbed on the interface. The interfacial activity of HDEHP in different system decreased as follows: aliphatic hydrocarbon, aromatic hydrocarbon, carbon tetrachloride, chloroform, MIBK. This might be attributed to the molecular interaction between diluent and extractant or (and) diluent and water immediately adjacent to the interface. The extraction kinetics with HDEHP in different diluents has also been discussed.