含载体D2EHPA的更新型支撑液膜体系对三价钆的分离  

Separation of Trivalent Gadolinium with Renewal Supported Liquid Membrane System Containing D2EHPA as Flowing Carrier

作　　者：裴亮[1,2] 王理明[3,2] 郭维[3] 赵楠[2] 

机构地区：[1]中国科学院地理科学与资源研究所陆地水循环及地表过程重点实验室,北京100101 [2]西安理工大学水利水电学院,西安710048 [3]西安工程大学环境与化学工程学院,西安710048

出　　处：《化学学报》2011年第13期1553-1558,共6页Acta Chimica Sinica

基　　金：国家自然科学基金青年科学基金项目(Nos.41001131,51009126);中国科学院西部行动计划项目(No.KZCX2-XB2-13);西安理工大学优秀博士学位论文研究基金(Nos.602-210805,602-210804)资助项目

摘　　要：研究了以聚偏氟乙烯膜为支撑体,二-(2-乙基己基)磷酸(D2EHPA)为流动载体,煤油和D2EHPA的混合溶液作为膜溶液,膜溶液和解析剂HCl溶液组成更新相的更新型支撑液膜(RSLM)中Gd(Ⅲ)的分离行为;考察了料液pH、更新相HCl浓度、膜溶液与HCl溶液体积比、不同载体浓度对Gd(Ⅲ)分离的影响,得出了Gd(Ⅲ)最优分离条件为:更新相HCl溶液浓度4.00 mol/L,膜溶液与HCl溶液体积比4∶3,载体浓度控制在0.160 mol/L,料液相中pH为4.80.在最优分离条件下,当Gd(Ⅲ)的初始浓度为1.00×10-4 mol/L时,35 min Gd(Ⅲ)分离率达到95.7%.最后根据传质定律和界面化学理论提出了Gd(Ⅲ)在RSLM中的传质动力学方程.Using polyvinylidene fluoride membrane（PVDF） as a support,kerosene as a membrane solvent,di（2-ethylhexyl） phosphoric acid（D2EHPA） as a flowing carrier,the Gd（Ⅲ） separation in a renewal sup-ported liquid membrane（RSLM） was investigated.The effects of pH in the feed phase,volume ratio of membrane solution to HCl solution,concentration of HCl solution and concentration of carrier in the re-newal phase on separation of Gd（Ⅲ） have also been studied,respectively.As a result,the optimum separa-tion conditions of Gd（III） were obtained as that concentration of HCl solution was 4.00 mol/L,concentration of D2EHPA was 0.160 mol/L,and volume ratio of membrane solution to HCl solution was 4∶3 in the re-newal phase,and pH was 4.80 in the feed phase.When initial concentration of Gd（Ⅲ） was 1.00×10-4 mol/L,the separation rate of Gd（Ⅲ） was up to 95.7% in 35 min.The kinetic equation of Gd（Ⅲ） separation in RSLM was developed in terms of the law of mass diffusion and the theory of interface chemistry.

关 键 词：更新型支撑液膜 二-(2-乙基己基)磷酸 钆(Ⅲ) 更新相 

分 类 号：TG146.45[一般工业技术—材料科学与工程]