Extraction of Sc(Ⅲ) Using a Bifunctional Ionic Liquid [A336][P507]

doi:10.11944/j.issn.1000-0518.2016.03.150305

Chinese Journal of Applied Chemistry ›› 2016, Vol. 33 ›› Issue (3): 330-335.DOI: 10.11944/j.issn.1000-0518.2016.03.150305

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Extraction of Sc(Ⅲ) Using a Bifunctional Ionic Liquid [A336][P507]

SHEN Lu^a^b,CHEN Ji^a^*(),DENG Yuefeng^a

^aState Key Laboratory of Rare Earth Resources Utilization,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022,China
^bGraduate School of the Chinese Academy of Sciences,Beijing 100049,China

Received:2015-08-24 Accepted:2015-11-20 Published:2016-03-02 Online:2016-03-02
Contact: CHEN Ji
Supported by:
Supported by National Basic Research Program of China(No.2012CBA01202), the Natural Science Foundation of China(No.Grant 51174184)

Abstract

Abstract:

Extraction of Sc(Ⅲ) from HNO₃ medium and HCl medium using a bifunctional ionic liquid extractant [A336][P507] was investigated. The results show that the extractability of Sc(Ⅲ) by [A336][P507] is high at low acidity. The extraction efficiency of Sc(Ⅲ) decreases when the aqueous phase acidity increases from 0.5 mol/L to 4 mol/L. The extraction mechanism was investigated. The extracted complex of Sc(Ⅲ) is different from light REs due to the smaller radius of Sc(Ⅲ) and the competitive effect of P—O and P=O. The extraction efficiency of Sc(Ⅲ) is enhanced with the increase concentration of NaCl or NaNO₃ in the aqueous phase. Thermodynamic functions of the extraction reaction demonstrate that the extraction of Sc(Ⅲ) is an exothermic process. Extraction of other rare earth ions at low acidity by the extractant is negligible suggesting that [A336][P507] has potential in industrial applications of Sc(Ⅲ) extraction and separation over other rare earth ions.

Key words: [A336][P507], extraction, Sc(Ⅲ), hydrochloric acid medium and nitric acid medium

CLC Number:

SHEN Lu, CHEN Ji, DENG Yuefeng. Extraction of Sc(Ⅲ) Using a Bifunctional Ionic Liquid [A336][P507][J]. Chinese Journal of Applied Chemistry, 2016, 33(3): 330-335.

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Extraction of Sc(Ⅲ) Using a Bifunctional Ionic Liquid [A336][P507]

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