摘要
离子液体稀溶液的物化性质是研究离子液体混合液的重要基础数据,可为工业生产和应用提供理论依据。研究了离子液体与水形成稀溶液体系的物化性质,在293.15~318.15 K温度范围内,测定了不同质量摩尔浓度1-乙基-4-丁基-1,2,4-三唑乙酰基半胱氨酸离子液体[Taz(2,4)][Accys]与水形成稀溶液体系的密度和表面张力。通过密度值,计算了离子液体水溶液的平均摩尔体积和超额摩尔体积,通过密度和温度的拟合参数计算得到了稀溶液体系的热膨胀系数,并分别对其随浓度和温度的变化规律进行了讨论。通过表面张力值,计算了离子液体水溶液摩尔表面Gibbs自由能gs,其计算公式与传统的Eӧtvӧs方程相关联得到改进的Eӧtvӧs方程,根据改进方程继续拟合和计算得到了离子液体水溶液的摩尔表面熵和摩尔表面焓值,发现摩尔表面焓值在不同温度下几乎不发生变化。
The physicochemical properties of dilute ionic liquid solution are important basic data and can provide theoretical basis for industrial productions and applications.Here the physical and chemical properties of 1-ethyl-4-butyl-1,2,4-triazoliumacetyl cysteine ionic liquid[Taz(2,4)][Accys]and water with different mass molar concentrations were explored,including the density and surface tension in the temperature range of 293.15~318.15 K.The average molar volume,excess molar volume and the thermal expansion coefficient of the ionic liquid dilute solution system were obtained,moreover,the changes with concentration and temperature were discussed respectively.In addition,the molar surface Gibbs free energy of ionic liquid aqueous solution was also calculated,and based on it,the traditional Eӧtvӧs equation was improved,and the molar surface enthalpy h and the molar surface entropy swere also obtained.It wasfound that the molar surface enthalpy almost didnot change at different temperatures.
作者
刘进
高瑀笛
魏杰
房大维
臧树良
LIU Jin;GAO Yu-di;WEI Jie;FANG Da-wei;ZANG Shu-liang(Institute of Rare and Scattered Elements,College of Chemistry,Liaoning University,Shenyang Liaoning 110036,China)
出处
《当代化工》
CAS
2023年第11期2521-2526,2531,共7页
Contemporary Chemical Industry
基金
国家自然科学基金项目(项目编号:22173039)。
关键词
半胱氨酸
离子液体
水溶液
物化性能
Cysteine
Ionic liquid
Aqueous
Physicochemical properties
