PC-88A为载体的液膜体系传输Ni(Ⅱ)动力学  

Transport Kinetics of Ni(Ⅱ) through Liquid Membrane Using PC-88A as Carrier

作　　者：余晓皎[1] 姚秉华[1] 闵涛[1] 周孝德[1] 

机构地区：[1]西安理工大学应用化学系环境科学研究所,陕西西安710048

出　　处：《稀有金属》2009年第4期591-596,共6页Chinese Journal of Rare Metals

基　　金：陕西省科技攻关计划项目(2008K08-09);西安理工大学博士启动项目(108210803)资助

摘　　要：采用2-乙基己基膦酸-2-乙基己基单酯(PC-88A)为载体,CHC l3为膜溶剂的大块液膜体系,研究了搅拌速度、载体浓度、pH、反应体系温度对镍离子传输的影响,测定了不同反应温度下的表观反应速率常数、镍离子在膜相中的最大值以及出现最大值的时间、镍离子在萃取与反萃取反应中进入和流出液膜的最大通量,获得了萃取与反萃取表观反应活化能分别为29.1和28.67 kJ.mol-1。结果表明,实验数据与理论值能够很好的吻合,镍离子的迁移过程可以以两个串联的准一级不可逆过程描述,在此实验条件下化学反应为控速步骤。The effects of stirring speed, carrier con- centration, pH value and reaction temperature on transport of Ni （Ⅱ ） ion through bulk liquid membrane with 2-ethylhexyl phosphonic acid- mono -2-ethylhxylester as carrier dissolved in chloroform were studied.The kinetic parameters including apparent rate con- stants of Ni（ Ⅱ ） ion extraction and re-extraction reac- tions, the maximum concentration of Ni （ Ⅱ ） ion in the liquid membrane, the time of the maximum value of maximum concentration of Ni （Ⅱ ） ion in the liquid membrane and the maximum entry and exit fluxes of Ni（ Ⅱ ） ion through the liquid membrane of the ex- traction and stripping reactions were evaluated. The apparent activation energy values were 29.1 kJ·mol-1 for extraction and 28.67 kJ ·mol-1 for stripping, respectively. The results indicated that experimental da- ta agreed well with theoretical predictions and the ki- netics of Ni（ Ⅱ ） transport could be evaluated by two consecutive irreversible pseudo-first order reactions. Chemical reaction was controlling procedure.

关 键 词：2-乙基己基膦酸-2-乙基己基单酯 镍离子 液膜 传输动力学 

分 类 号：TQ028.8[化学工程]