【摘要】 研究了三正辛胺 -二甲苯支撑液膜体系中搅拌速率、反萃剂、三正辛胺浓度、料液中 H+ 浓度等因素对Cd( )离子迁移的影响 .用大块液膜测定了不同温度时 Cd( )离子跨膜迁移的萃取及反萃取的表观速率常数 k1 和 k2 .实验表明 ,温度升高 ,k1 和 k2 均增大 ( k1 >k2 ) ,且达到膜相最大镉离子浓度时所需的时间逐渐减少 .膜相积累的镉离子浓度达最大时 ,Cd( )离子跨膜传输为稳态传输 .根据 Arrhenious关系得到膜相萃取反应和反萃取反应的活化能分别为 2 3 .8和 1 9.3 k J/mol更多还原

【Abstract】 The effects of stirring rate, stripping agent, tri n octylamine concentration, initial concentrations of H + ions in the feed phase on transport flux of Cd(Ⅱ) ions across a tri n octylamine xylene supported liquid membrane were studied. The pseudo first order rate constants, k 1 and k 2, of the interfacial reactions on the feed and the stripping side membrane face were determined in bulk liquid membrane. The experimental results show that k 1 and k 2 increase with an increase of temperature and k 1> k 2. The t max decreases with a corresponding raising of temperature. The transport of Cd(Ⅱ) across membrane is in steady state when the concentration of Cd(Ⅱ) in membrane is maximum value. The apparent activation energies were found to be 23 8 kJ/mol for extraction and 19 3 kJ/mol for stripping extraction in the liquid membrane system according to Arrhenius equation, respectively. [WT5HZ]更多还原