This work evaluates the performance of emulsion liquid membrane (ELM) for the extraction of gadolinium(III) from acidic solution. The ELM was made up of di-(2-ethylhexyl) phosphoric acid (D2EHPA) as carrier, Span 80 (sorbitol monooleate) as emulsifying agent, commercial kerosene as organic diluent and Nitric acid as stripping phase. Important physical and chemical variables affecting the ELM performance for the extraction of gadolinium(III) such as carrier concentration, mixing time, surfactant concentration, agitation speed, initial pH of the feed phase, internal phase concentration, treatment ratio, and feed phase concentration were systematically investigated. Results indicated that the highest gadolinium(III) extraction can be attained after 10 min of mixing by using 0.05 M D2EHPA, 1.5% (v/v) Span 80, 1.0 M nitric acid as stripping phase at feed phase pH of 2, agitation speed of 180 rpm, and treatment ratio of 1:10. At the optimum condition, simultaneous quantitative extraction (>99%) and stripping (>79%) of gadolinium were achieved. Furthermore, the overall mass transfer coefficient was calculated and the results revealed that the extraction was interfacially controlled.

这项工作评估乳液液膜（ELM）从酸性溶液中萃取g（III）的性能。ELM由二（2-乙基己基）磷酸（D2EHPA）作为载体，Span 80（山梨糖醇单油酸酯）作为乳化剂，市售煤油作为有机稀释剂以及硝酸作为汽提相组成。影响萃取（（III）的ELM性能的重要物理和化学变量，例如载剂浓度，混合时间，表面活性剂浓度，搅拌速度，进料相的初始pH，内相浓度，处理比例和进料相浓度是系统地调查。结果表明，使用0.05 M D2EHPA，1.5％（v / v）Span 80、1混合10分钟后，可以获得最高的g（III）萃取率。在进料相pH为2时，以0 M硝酸作为汽提相，搅拌速度为180 rpm，处理比为1:10。在最佳条件下，可以同时进行extraction的定量提取（> 99％）和汽提（> 79％）。此外，计算了总传质系数，结果表明萃取是界面控制的。