阴、阳离子表面活性剂混合体系在硅胶/水及硅胶/矿化水界面上的吸附

Adsorption of Cationic-Anionic Surfactant Mixtures on Silica Gel/Water and Silica Gel/Mineralized Water Interfaces

研究阴、阳离子表面活性剂混合体系(十二烷基氯代吡啶/辛基磺酸钠, 辛基三乙基溴化铵/十二烷基苯磺酸钠)在硅胶/纯水和硅胶/矿化水界面上的吸附作用, 探讨阴(阳)离子表面活性剂的存在对阳(阴)离子表面活性剂吸附作用的影响. 结果表明, 阴离子表面活性剂的存在基本不影响阳离子表面活性剂在带负电固体表面的吸附; 而阳离子表面活性剂的存在却使本来吸附量就不大的阴离子表面活性剂在带负电的固体表面上不再吸附. 在矿化水中阳离子表面活性剂的吸附量比在纯水中明显降低. 从硅胶表面吸附机制解释了所得结果.

The adsorption of cationic-anionic surfactant mixtures (dodecylpyridinum chloride/sodium octylsulfonate and octyltriethylammonium bromide/sodium dodecylbenzenesulfonate) on silica gel/water and silica gel/mineralized water interfaces was investigated. The effects of anionic (cationic) surfactants on the adsorption of cationic (anionic) surfactants were discussed. It was shown that the existence of anionic surfactant did not affect the adsorption of cationic surfactants on negatively charged solid surface, but the anionic surfactant, which had low amount adsorbed on negatively charged solid surface, was no longer adsorbed with the existence of cationic surfactant. The amount adsorbed of the cationic surfactant was much lower in mineralized water solution than in water solution. The results were explained based on the adsorption mechanism of silica gel.