Extraction mechanism of rare earths from chloride acidic solution with ammonium-bifunctionalized ionic liquid extractants

• Published in: Science China. Chemistry Vol. 59; no. 5; pp. 532 - 537
• Main Authors: Yang, Hualing, Chen, Ji, Wang, Wei, Cui, Hongmin, Liu, Wengang, Liu, Yu
• Format: Journal Article
• Language: English
• Published: Beijing Science China Press 01.05.2016; Springer Nature B.V
• Subjects: Anions; Carboxylic acids; Chemistry; Chemistry and Materials Science; Chemistry/Food Science; Chlorides; Ionic liquids; Lanthanum; Rare earth elements; Salting; Separation; Synergistic effect; 分离性能; 双功能; 氯化铵; 离子液体; 稀土离子; 萃取剂; 萃取机理; 酸性溶液; separation; ammonium-bifunctional ionic liquids; rare earths
• ISSN: 1674-7291; 1869-1870
• DOI: 10.1007/s11426-016-5585-0

A series of ammonium-bifunctionalized ionic liquid extractants （ammonium-Bif-ILEs） combined with a number of anions, in- cluding carboxylic acids and 1,3-diketonates, have been prepared and studied in this report. Their extraction behavior and properties toward rare earth ions （REs（III）） are systematically investigated in chloride media as a function of important param- eters such as aqueous phase pH, salting-out agent concentrations, and extraction temperature. The separation performance of ammonium-Bif-ILEs toward REs（III） are systematically discussed. The results demonstrate that ammonium-Bif-ILEs have a synergistic effect between the cation and anions in separation of REs（III）. The influences of different anions on separation fac- tor （β） values are further studied. By comparison, ammonium-Bif-ILEs containing 1,3-diketonates have more potential appli- cations in La（III）/RE（III） separation than those containing carboxylic acids.