不同类型的离子表面活性剂对甲苯的增溶作用  

Different types of ionic surfactants for solubilization of toluene

作　　者：于原浩 张有贤[1] 杜琦[1] 郑玉祥[1] 李二强 YU Yuan-hao;ZHANG You-xian;DU Qi;ZHENG Yu-xiang;LI Er-qiang(College of Earth & Environmental Science,Lanzhou University,Lanzhou 730000,China)

机构地区：[1]兰州大学资源环境学院

出　　处：《应用化工》2019年第10期2344-2349,共6页Applied Chemical Industry

基　　金：中央高校基本科研业务费专项资金资助(lzujbky-2017-it103)

摘　　要：通过电导法测定SDBS、CTAB、FMES3种离子表面活性剂水溶液在25,30,35℃时的临界胶束浓度(CMC),并依据CMC和范特霍夫方程计算了3种体系下的ΔHm^θ、ΔSm^θ和ΔGm^θ,测定无机盐(NaCl、Na2SO4)和有机物(乙醇、十二醇)对表面活性剂增溶甲苯的影响。结果表明,3种体系下ΔGm^θ均为负,这说明3种表面活性剂在水溶液中均易于形成胶团;3种离子表面活性剂的CMC大小顺序与对甲苯溶解量的大小顺序不同,说明CMC大小并不是影响甲苯增溶的唯一因素;添加一定量有机物[n(乙醇)∶n(FMES)=1∶4]或者无机盐(0.2mol/L浓度的NaCl)对甲苯增溶效果更好。Critical Micelle Concentration (CMC) of three kinds of ionic-surfactants aqueous solution including sodium dodecyl benzene sulfonic acid (SDBS),cetyl trimethyl ammonium bromide (CTAB) and fatty acid methyl ester ethoxylate sodium sulfonate (FMES) were measured through conductivity method at various temperature of 25,30,35 ℃,and the standard enthalpy change (ΔHm^θ),entropy change (ΔSm^θ) and Gibbs free energy (ΔGm^θ) were calculated with the aid of the CMC values and Van’t Hoff equation.In addition,the effect of addition of inorganic salts (NaCl,Na2SO4) and organics (ethanol,dodecyl alcohol) on the solubilization of toluene of the surfactants was explored.Results showed that the value of ΔGm^θ was negative in every system,which indicating that these three surfactants were easily micellized in pure water solution.The order of the CMC size of the three surfactants is different from the order of the amount of toluene dissolved,which suggesting that the concentration of CMC is not the only factor that affecting the solubilization of toluene.The addition of a certain amount of organic matter [ n (ethanol)∶ n (FMES)=1 ∶4] or inorganic salt (0.2 mol/L NaCl) has a better solubilizing effect on toluene.

关 键 词：表面活性剂 CMC 增溶作用 

分 类 号：TQ423[化学工程] TQ123