Zhou Haitao, Ye Yuxi, Tan Yuefei, Zhu Kailun, Liu Xinmin, Tian Hongjing, Guo Qingjie, Wang Lingyun, Zhao Shuju, Liu Yang
Key Laboratory of Clean Chemical Processing Engineering of Shandong Province, College of Chemical Engineering, Qingdao University of Science and Technology, Qingdao 266042, China.
School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China.
Membranes (Basel). 2022 Mar 30;12(4):376. doi: 10.3390/membranes12040376.
In this work, separation and recovery of gallium from aqueous solutions was examined using acid-base bifunctional ionic liquids (Bif-ILs) in both solvent extraction and supported liquid membrane (SLM) processes. The influence of a variety of parameters, such as feed acidity, extractant concentration and metal concentration on the solvent extraction behavior were evaluated. The slope method combined with FTIR spectroscopy was utilized to determine possible extraction mechanisms. The SLM containing Bif-ILs demonstrated highly selective facilitated transport of 96.2% Ga(III) from feed to stripping solution after optimization. During the evaluation of the separation performance of SLM for the transport of Ga(III), in the presence of Al(III), Mg(II), Cu(II) and Fe(II), 88.5% Ga(III) could be transported with only 6% Fe(II) and a nil quantity of other metals co-transported. SLM exhibited excellent long-time stability in five repeated transport cycles. Highly selective transport and separation performance was achieved using the SLM containing Bif-ILs, indicating considerable potential for application in Ga(III) recovery.
在这项工作中，研究了在溶剂萃取和支撑液膜（SLM）过程中使用酸碱双功能离子液体（Bif-ILs）从水溶液中分离和回收镓。评估了各种参数，如进料酸度、萃取剂浓度和金属浓度对溶剂萃取行为的影响。采用斜率法结合傅里叶变换红外光谱（FTIR）来确定可能的萃取机理。经过优化后，含有Bif-ILs的支撑液膜显示出从进料到反萃液的96.2% Ga(III)的高选择性促进传输。在评估支撑液膜对Ga(III)传输的分离性能时，在Al(III)、Mg(II)、Cu(II)和Fe(II)存在的情况下，88.5%的Ga(III)能够被传输，同时仅有6%的Fe(II)和零含量的其他金属被共传输。支撑液膜在五个重复传输循环中表现出优异的长期稳定性。使用含有Bif-ILs的支撑液膜实现了高选择性传输和分离性能，表明其在Ga(III)回收方面具有相当大的应用潜力。
