Université de Lyon, F-69003 Lyon, France.
J Colloid Interface Sci. 2011 Jan 1;353(1):225-30. doi: 10.1016/j.jcis.2010.09.049. Epub 2010 Oct 14.
The use of supercritical CO(2) as solvent in the modification of montmorillonite by imidazolium and phosphonium ionic liquids bearing long alkyl chains (C(18)) known for their excellent thermal stability is described. The objective is to combine the environmentally friendly character of ionic liquids and supercritical carbon dioxide for the organophilic treatment of lamellar silicates. Dialkyl imidazolium and alkyl phosphonium salts were synthesized to be used as new surfactants for cationic exchange of layered silicates. Then, the synthesized phosphonium (MMT-P) or imidazolium (MMT-I) modified montmorillonites, cationically exchanged under supercritical carbon dioxide with or without co-solvent, have been analyzed by thermogravimetric analysis (TGA) and X-ray diffraction (XRD) and compared to montmorillonites treated by conventional cationic exchange.
使用超临界 CO(2)作为溶剂，通过具有长烷基链（C(18)）的离子液体对蒙脱土进行修饰，这些离子液体以其优异的热稳定性而闻名。目的是将离子液体和超临界二氧化碳的环保特性结合起来，用于层状硅酸盐的亲有机处理。合成了二烷基咪唑鎓和烷基鏻盐，用作层状硅酸盐阳离子交换的新型表面活性剂。然后，通过热重分析（TGA）和 X 射线衍射（XRD）对在超临界二氧化碳中或与共溶剂一起进行阳离子交换的合成的磷酸酯（MMT-P）或咪唑鎓（MMT-I）改性蒙脱土进行分析，并与通过常规阳离子交换处理的蒙脱土进行比较。
