液膜法提取废水中Cr3+相界面反应的热力学研究
Study on the Phase Interfacial Reactions in the Process of Extracting Cr3+ by Emulsion Liquid Membranes
作者：费德君(四川大学 化工学院,四川 成都 610065)；党亚固(四川大学 化工学院,四川 成都 610065)；罗建洪(四川大学 化工学院,四川 成都 610065)
Author：(School of Chem. Eng., Sichuan Univ., Chengdu 610065, China)；(School of Chem. Eng., Sichuan Univ., Chengdu 610065, China)；(School of Chem. Eng., Sichuan Univ., Chengdu 610065, China)
收稿日期：2006-10-11 年卷（期）页码：2007,39(6):71-75
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：液膜； Cr3+; 相界面反应; 对叔丁基杯 芳烃乙酸
Key words：liquid Membranes;Cr3+ phase interfacial reaction;p-tert-butylcalix arene acetate
基金项目：国家自然科学基金资助项目(20306018 )
中文摘要
选择新型的超分子化合物——对叔丁基杯芳烃乙酸作为活性载体，研究了采用乳状液膜法分离废水中Cr3+的界面反应方程式及反应的热力学性质。研究表明液膜外相界面的反应符合阳离子交换机理，液膜内相界面的反应为氧化还原反应；得到了外相界面及内相界面反应的平衡常数K分别为2.45×10-4、1027.5（30 ℃时），反应焓△H分别为69.9、-159.4 kJ·mol-1，反应自由焓△G分别是-25.0、-159.4 kJ·mol-1，反应熵△S分别是316.4、75.531 kJ·mol-1K-1。
英文摘要
The reaction mechanisms and the thermodynamic functions on phase interfaces in the extraction of Cr3+ by emulsion liquid membranes with p-tert-butylcalix arene acetate as the activity carrier were studied. The results showed that the reaction mechanism on the external phase accord with the cation exchange and on the internal phase is oxidation reduction reaction. The equilibrium constants and thermodynamic functions △H、△S and △G of the two reactions were also calculated .The results not only provided an important theory basis for the process of extracting Cr3+ by emulsion liquid membranes, but also gave an important reference for the extensive application of p-tert-butylcalix arene acetate as a new activity carrier.
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