液膜法提取废水中Cr^(3+)相界面反应的热力学研究  

Study on the Phase Interfacial Reactions in the Process of Extracting Cr^(3+) by Emulsion Liquid Membranes

作　　者：费德君[1] 党亚固[2] 罗建洪[1] 武建勋[1] 李丽[1] 曾婧[1] 张志业[1] 

机构地区：[1]四川大学化工学院,四川成都610065 [2]四川大学高分子材料与工程学院,四川成都610065

出　　处：《四川大学学报（工程科学版）》2007年第6期71-75,共5页Journal of Sichuan University (Engineering Science Edition)

基　　金：国家自然科学基金资助项目(20306018)

摘　　要：选择新型的超分子化合物——对叔丁基杯[4]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。The reaction mechanisms and the thermodynamic functions on phase interfaces in the extraction of Cr^3＋ by emulsion liquid membranes with p-tert-butylcalix[4 ] arene acetate as the activity carrier were studied. The resuits 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 Cr^3＋ by emulsion liquid membranes, but also gave an important reference for the extensive application of p -tert- butylcalix[4] arene acetate as a new activity carrier.

关 键 词：液膜 CR^3+ 相界面反应 芳烃乙酸 

分 类 号：TQ132[化学工程—无机化工]