PC-88A-煤油-HCl分散支撑液膜中Co(Ⅱ)的传输研究  

Study on Transport of Co(Ⅱ) by Dispersion Supported Liquid Membrane System of PC-88A-Kerosene-HCl

作　　者：吴小宁[1,2] 姚秉华[1] 付兴隆 杨谦[1] 

机构地区：[1]西安理工大学水利水电学院,理学院,陕西西安710048 [2]西安工业大学,陕西西安710032

出　　处：《西安理工大学学报》2008年第2期187-191,共5页Journal of Xi'an University of Technology

基　　金：西安市科技攻关资助项目(GG05074);陕西省教育厅专项科研基金资助项目(06JK215)

摘　　要：以聚偏氟乙烯膜(PVDF)为支撑体,煤油为膜溶剂,2-乙基己基膦酸-单-2-乙基己基酯(PC-88A)为流动载体,研究了分散支撑液膜体系中金属Co(Ⅱ)的传输行为;考察了料液相pH、分散相中液膜相(0.081mol/L PC-88A/煤油)与解析相(HCl溶液)体积比、解析相中HCl浓度、Co(Ⅱ)初始浓度对Co(Ⅱ)传输的影响。结果表明,用HCl作解析剂,料液相pH=6.0、液膜相与解析相体积比为160∶40、解析相中HCl浓度为4.0mol/L时,该分散支撑液膜体系对金属Co(Ⅱ)具有最佳传输。在最佳传输条件下,起始浓度为3.0×10-4mol/L时,190min,Co(Ⅱ)传输率可达到94.4%,而传统支撑液膜只能达到62.6%。从界面化学和扩散传质角度提出了金属离子的传输动力学方程,采用直线斜率法对Co(II)在分散支撑液膜体系中的扩散层厚度(δa=1.67×10-4m)和扩散系数(d0=8.99×10-11m2/s)进行了测定,取得满意结果。The Transport behaviour of Co （ Ⅱ ） through a dispersion supported liquid membrane （DSLM） consisting of 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester （PC-88A） in kerosene supported on the polyvinylidene fluoride membrane（PVDF）, and HCl solution, is studied. The effects of pH value in the feed phase, volume ratio of liquid membrane phase（0.081mol/L PC-88A/kerosene） and strip phase （ HCI solution）, concentration of HCI in the strip phase, and initial concentration of Co （ Ⅱ ） in the feed phase are also researched. The results show that cobalt （ Ⅱ ） can be transported effectively when pH = 6. 0 in the feed phase, the volume ratio is 160 ： 40, concentration of HCI in the strip solution is 4.0mol/L. The transport rate of Co（ Ⅱ ） can reach 94.4% through DSLM, and 62.6% through traditional SLM, respectively, under the optimum condition with transport time 190min, for initial concentration of 3.0 × 10^-4mol/L Co（ Ⅱ ）. The transport kinetic equation is derived in terms of the law of mass diffusion and the interface chemistry. The thickness of aqueous diffusion layer （δa） and diffusion coefficient （d0 ） of Co（ Ⅱ ） through DSLM are evaluated, with the linear slope method to be 1.67 × 10 ^-4 m and 8.99 × 10^-11 m^2/s , respectively, with the satisfactory results obtained.

关 键 词：液膜 分散支撑液膜 传输分离 有机膦酸 钴(Ⅱ) 

分 类 号：TQ028.8[化学工程]