Study on the aqueous solution behavior and extraction mechanism of Nd(III) in the presence of the complexing agent lactic acid with di-(2-ethylhexyl) phosphoric acid

被引：26
作者：
Yin, Shao-Hua [1 ,2 ,3 ,4 ,5 ]
Li, Shi-Wei [1 ,2 ,3 ,4 ,5 ]
Xie, Feng [1 ,2 ,3 ,4 ,5 ]
Zhang, Li-Bo [1 ,2 ,3 ,4 ,5 ]
Peng, Jin-Hui [1 ,2 ,3 ,4 ,5 ]
机构：
[1] Kunming Univ Sci & Technol, State Key Lab Complex Nonferrous Met Resources Cl, Kunming 650093, Yunnan, Peoples R China
[2] Minist Educ, Key Lab Unconvent Met, Kunming 650093, Yunnan, Peoples R China
[3] Kunming Univ Sci & Technol, Fac Met & Energy Engn, Kunming 650093, Yunnan, Peoples R China
[4] Natl Local Joint Lab Engn Applicat Microwave Ener, Kunming 650093, Yunnan, Peoples R China
[5] Yunnan Prov Key Lab Intensificat Met, Kunming 650093, Yunnan, Peoples R China
来源：
RSC ADVANCES | 2015年 / 5卷 / 79期
关键词：
LIQUID-LIQUID-EXTRACTION; RARE-EARTH-ELEMENTS; SOLVENT-EXTRACTION; CHLORIDE MEDIUM; CHEMICAL-REACTION; SEPARATION; NEODYMIUM; KINETICS; COMBINATION; CONVERSION;
D O I：
10.1039/c5ra09928e
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
The aqueous solution behavior and extraction mechanism of single Nd(III) from a chloride medium with di(2-ethylhexyl) phosphoric acid (D2EHPA, H(2)A(2)) in the presence of the complexing agent lactic acid (HLac) have been reported. The analyses by FT-IR and UV of the aqueous solution indicate that there is a coordination mechanism between Nd3+ and Lac(-) in the form of the carboxyl oxygen bridge bidentate ligand. A cation extraction mechanism has been studied using the method of slope analysis and saturation loading capacities, and also confirmed by FT-IR and NMR. The equilibrium constants and thermodynamic functions have been calculated. The separation factors of La/Ce, Ce/Pr and Pr/Nd are 3.24, 2.04 and 1.58, indicating that this system is beneficial for separating light rare earths. The results could provide some reference value for complexing extraction systems.
引用
收藏
页码：64550 / 64556
页数：7
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