羧酸盐型Gemini表面活性剂的吸附性能研究

Studies on the Adsorption Properties of Carboxylate Gemini Surfactants

赖璐梅平郑延成陈武艾俊哲刘华荣

LAI Lu MEI Ping ZHENG Yan-Cheng CHEN Wu AI Jun-Zhe LIU Hua-Rong

本文研究了自制羧酸盐型Gemini表面活性剂CGS-2的表面活性及NaCl对其表面活性的影响，并考察了液固比、吸附时间和浓度对CGS-2在砂岩表面静态吸附量的影响。结果表明，CGS-2水溶液的临界胶束浓度为0．0223mmol／L,比普通单链表面活性剂月桂酸钠低2～3个数量级，表面张力最低可降至29．49mN／m；适量加入NaCl可降低CGS-2溶液的临界胶束浓度。CGS-2在砂岩上的吸附等温线符合Langmuir吸附等温式，液固比为30：1、吸附时间为36h，25℃下CGS-2的饱和吸附量为8．93mg／g。图8表1参14

In this paper,the surface activity of carboxylate gemini surfactants CGS-2 and the effect of the addition of NaCl on it were investigated,the effects of the liquid-solid ratio,absorption time and concentration on the surface adsorption of CGS-2 on the sandstone were studied.The results showed that,the critical micelle concentration of CGS-2 solution was 0.0223 mmol/L,which was 2—3 magnitude orders lower than that of the conventional surfactants,laurate sodium.The surface tension minimized to 29.49 mN/m.When adding a given mass of NaCl,the critical micelle concentration of CGS-2 decreased.The adsorption isotherm accorded with Langmuir mode.When the Liquid-solid ratio was 30∶ 1,and the adsorption equilibrium time was 36 h,the adsorption capacity of CGS-2 reached to the maximum on the sandstone surface at 25℃,being of 8.93 mg/g.