VB/CHCl_3液膜体系中银离子的传输分离  

Transport Separation of Silver Ion by VB/CHCl_3 Liquid Membrane System

作　　者：姚秉华[1] 陈静[1] 王骋[1] 余晓皎[1] 永长幸雄[2] 

机构地区：[1]西安理工大学应用化学系,陕西西安710048 [2]福井大学工学部

出　　处：《稀有金属》2005年第2期244-247,共4页Chinese Journal of Rare Metals

基　　金：陕西省自然科学基金 (2 0 0 0H15 ) ;陕西省教育厅专项基金 (0 2JK14 )资助项目

摘　　要：采用内耦合大块液膜分离技术,通过考察料液相pH值、料液相NaCN浓度、载体浓度以及解析相NaOH浓度对Ag(Ⅰ)传输的影响,研究了以维多利亚蓝(VB)为流动载体的液膜中银的传输规律,并建立了渗透系数与pH值、NaCN浓度以及载体浓度等之间的关系方程。结果表明,Ag(Ⅰ)以VB+ ·Ag(CN) 2 - 离子缔合物形式在液膜中传输,最佳传输条件为:料液相中NaCN浓度为5 .0×10 - 3mol·L- 1 (pH =5 .5 ) ,解析相为0 .0 5mol·L- 1 NaOH ,载体VB浓度为4.0 0×10 - 4mol·L- 1 。Ni(Ⅱ) ,Co(Ⅱ) ,Zn(Ⅱ) ,Cu(Ⅱ) ,Pb(Ⅱ)及Cd(Ⅱ)离子对Ag(Ⅰ)传输无影响。The transport rate of Ag(Ⅰ) ion in the system of inner-coupled liquid membrane containing Victoria blue (VB) as a mobile carrier in CHCl_3 solvent was studied. The effects of pH values and NaCN concentrations in the feed phase, VB carrier concentrations in the membrane phase, and NaOH concentrations in the striping phase were investigated. The results show that Ag(Ⅰ) ion can be transported through a bulk liquid membrane as the form of VB +Ag(CN)_2 - ion associated compound. The optimal transport conditions are identified to be pH 5 5, 5.00×10 -3 mol·L -1 NaCN in the feed phase, 0.05 mol·L -1 NaOH in striping phase, and 4.00×10 -4 mol·L -1 VB in the membrane phase, respectively. This system has a high selectivity for Ag(Ⅰ) ion and can efficiently transport Ag(Ⅰ) ion from aqueous solutions containing Ni(Ⅱ), Co(Ⅱ), Zn(Ⅱ), Cu(Ⅱ), Pb(Ⅱ) and Cd(Ⅱ).

关 键 词：液膜分离 金属离子 Ag(Ⅰ) 维多利亚蓝(VB) 

分 类 号：TQ028.8[化学工程]