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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。
Using 2-ethylhexylphosphonic acid 2-ethylhexyl monoester (PC-88A) as carrier and CHCl3 as membrane solvent bulk liquid membrane system, the effects of stirring speed, carrier concentration, pH, temperature of reaction system Nickel ion transport, the apparent reaction rate constants at different reaction temperatures, the maximum value of nickel ion in the membrane phase and the time at which the maximum value occurs were determined, and the nickel ions in and out of the liquid membrane in the extraction and stripping reaction The maximum flux, the apparent activation energy of extraction and back extraction were obtained as 29.1 and 28.67 kJ · mol-1, respectively. The experimental results show that the experimental data agree well with the theoretical values. The migration of nickel ions can be described by two series of quasi-first-order irreversible processes. Under these experimental conditions, the chemical reaction is the rate-controlling step.