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化学学报
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化学学报 ›› 2007, Vol. 65 ›› Issue (4): 315-322. 上一篇    下一篇

研究论文

Pitzer-Simonson理论和Pitzer-Simonson-Clegg理论在离子液体PMIBF4水溶液中的应用

佟静1,2, 李景斌1, 张庆国2,3, 杨家振*,1   

  1. (1辽宁大学化学院 沈阳 110036)
    (2中国科学院青海盐湖研究所 西宁 810008)
    (3中国科学院研究生院 北京 100049)
  • 投稿日期:2006-02-21 修回日期:2006-08-25 发布日期:2007-02-28
  • 通讯作者: 杨家振

Application of Pitzer-Simonson Theory and Pitzer-Simonson-Clegg Theory to Aqueous Ionic Liquid PMIBF4

TONG Jing1,2; LI Jing-Bin1; ZHANG Qing-Guo2,3; YANG Jia-Zhen*,1   

  1. (1 College of Chemistry, Liaoning University, Shenyang 110036)
    (2 The Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008)
    (3 The Graduate University of Chinese Academy of Sciences, Beijing 100049)
  • Received:2006-02-21 Revised:2006-08-25 Published:2007-02-28
  • Contact: YANG Jia-Zhen

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在278.15～343.15 K温度范围内, 测定了在浓度范围从摩尔分数0.09的四氟硼酸-1-甲基-3-戊基咪唑(PMIBF4)离子液体水溶液到纯离子液体的密度, 计算了离子液体PMIBF4水溶液的表观摩尔体积fV, 讨论了Pitzer-Simonson (PS) 理论和Pitzer-Simonson-Clegg (PSC)理论的适用性. 以纯离子液体为参考态, 用实验数据分别拟合了Pitzer-Simonson (PS)方程、Pitzer-Simonson-Clegg (PSC)方程和简化PSC方程, 得到了这些理论模型的体积参数值. 从拟合偏差来看, PSC方程比PS方程有更好的适用性. 同时还可看出, PSC方程比只有三个参数的简化PSC方程有更小的拟合标准偏差和更好的相关系数.

关键词: 离子液体, 电解质水溶液, Pitzer-Simonson理论, Pitzer-Simonson-Clegg理论, 表观摩尔体积, 四氟硼酸-1-甲基-3-戊基咪唑(PMIBF4)

The densities of aqueous ionic liquid (IL) 1-methyl-3-pentylimidazolium tetrafluoroborate (PMIBF4) in a concentration range of about 0.09 to 1 mol% were measured at temperatures from 278.15 to 343.15 K. Values of the apparent molar volumes of aqueous PMIBF4 were calculated. The applicability of Pitzer-Simomson (PS) theory and Pitzer-Simomson-Clegg (PSC) theory were examined. As pure ionic liquid was taken as a reference state, the experimental data were used to fit PS equation, PSC equation and the simplified PSC equation, respectively. In comparison with the values of the PS parameters and the simplified PSC parameters, the PSC parameters have the smallest standard deviation of the fitting.

Key words: ionic liquid, aqueous solution of electrolyte, Pitzer-Simonson theory, Pitzer-Simomson-Clegg theory, apparent molar volume, 1-methyl-3-pentylimidazolium tetrafluoroborate (PMIBF4)