摘要
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.
A series of ammonium-bifunctionalized ionic liquid extractants(ammonium-Bif-ILEs) combined with a number of anions, including 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 parameters such as aqueous phase p H, 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 factor(b) values are further studied. By comparison, ammonium-Bif-ILEs containing 1,3-diketonates have more potential applications in La(Ⅲ)/RE(Ⅲ) separation than those containing carboxylic acids.
基金
supported by the National Basic Research Program of China (2012CBA01202)
the National Natural Science Foundation of China (51174184, 21401110)
the Key Research Program of the Chinese Academy of Sciences (KGZD-EW-201-1)
the Natural Science Foundation of the Jiangsu Higher Education Institutions of China (14KJB150019)