【摘要】 以 2 乙基己基膦酸单 α 乙基己酯为载体 ,考察了料液相pH、膜相载体浓度、反萃相盐酸浓度及温度对液膜迁移镧离子的影响 .获得了不同温度下的表观反应速率常数 .萃取和反萃取反应的表观活化能分别为 15 .2kJ·mol- 1 和 2 6 .6kJ·mol- 1 .结果表明 ,镧离子的跨膜迁移过程可以两个串联的准一级不可逆过程进行描述更多还原

【Abstract】 Coupled transports of La(Ⅲ)ions were carried out by means of liquid membranes containing mono(2 ethylhexyl)2 ethylhexyl phosphonate in kerosene. The influences of pH in the feed solution,carrier concentration in the membrane phase, HCl concentration in the stripping solution, and temperature were investigated. The kinetics of La(Ⅲ) transport could be analyzed in the formalism of two consecutive irreversible pseudo first order reactions.The pseudo first order apparent rate constants of the interfacial transport of La(Ⅲ) species were determined with bulk liquid membrane,altering temperature.The apparent activation energy values are 15.2 kJ·mol -1 for extraction and 26.6 kJ·mol -1 for stripping, respectively.更多还原