[Bmim]BF_4-H_2O体系超额摩尔体积测定及关联  

Measurement and Correlation of Excess Molar Volume for the BF_4-H_2O System

作　　者：方伟慧[1] 林金清[1] 王国平[1] 金春英[1] 

机构地区：[1]华侨大学材料科学与工程学院,福建泉州362021

出　　处：《华侨大学学报（自然科学版）》2010年第4期430-433,共4页Journal of Huaqiao University(Natural Science)

基　　金：国家自然科学基金资助项目(20776057);国务院侨办科研基金资助项目(HGR005);华侨大学科研基金资助项目(07X0144)

摘　　要：合成并表征离子液体1-丁基-3-甲基咪唑四氟硼酸盐([Bmim]BF4),测定[Bmim]BF4-H2O二元混合物在不同温度下的密度值和超额摩尔体积.结果表明,在所有组成范围内,体系的超额摩尔体积都为正值,且不同温度下的等温线都存在一极大值点;同时,所有等温线的极值点所对应的H2O的摩尔分数基本上在50%左右.不同温度下超额摩尔集体的变化趋势相似,而在组成相同的情况下,随着温度的增加,超额摩尔体积变大.采用Redlich-Kister方程对[Bmim]BF4-H2O的超额摩尔体积进行关联,最大标准偏差为1.32%.Ionic liquid 1-butyl-3-methylimidazoliu tetrafluoborate（BF4） was synthesized and characterized.The densities and excess molar volumes of BF4-H2O binary mixtures were measured at temperature of 298.15,303.15,308.15 and 313.15 K.The results indicated that： excess molar volumes are positive within all different compositions,the shape of isotherms of the excess molar volume is similar at different temperatures and reaches its maximum values at the molar fraction of H2O nearing 0.5,and the excess molar volume of the same composition mixture increases with temperature increasing.Redlich-Kister equation was used for correlation of the isotherm,and the maximum standard deviation is 1.32%.

关 键 词：[BMIM]BF4 [Bmim]BF4-H2O 密度 超额摩尔体积 

分 类 号：O645.16[理学—物理化学]