Efficient and Sustainable Regeneration of Bifunctional Ionic Liquid for Rare Earth Separation

An effective and sustainable strategy of regeneration is important for the industrial application of functionalized ionic liquid in hydrometallurgy. The transformations of [tri-n-octylmethyl­ammonium]­[bis-sec-octylphenoxyl acetate] ([N1888]­[SOPAA]) and [trihexyl (tetradecyl) phosphonium]­[sec-octy...

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Published in:ACS sustainable chemistry & engineering 2017-04, Vol.5 (4), p.3471-3477
Main Authors: Huang, Chao, Huang, Bin, Dong, Yamin, Chen, Jinqing, Wang, Yanliang, Sun, Xiaoqi
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creator Huang, Chao
Huang, Bin
Dong, Yamin
Chen, Jinqing
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Sun, Xiaoqi
description An effective and sustainable strategy of regeneration is important for the industrial application of functionalized ionic liquid in hydrometallurgy. The transformations of [tri-n-octylmethyl­ammonium]­[bis-sec-octylphenoxyl acetate] ([N1888]­[SOPAA]) and [trihexyl (tetradecyl) phosphonium]­[sec-octylphenoxy acetate] ([P6,6,6,14]­[SOPAA]) under acidic and alkaline conditions were investigated. This paper developed a novel approach for sustainable stripping and efficient regeneration of acid–base coupling bifunctional ionic liquid (ABC-BIL) for rare earth element (REE) separation. After the stripping using deionized water, both NaOH and Na2C2O4 were indicated to be effective for the regeneration of organic phase containing [N1888]­[SOPAA]. In order to recycle REE, the precipitates of REE­(OH)3 and REE2(C2O4)3 were analyzed, and a sedimentation–calcination strategy was proposed. The investigation of sedimentation–calcination also offered a promising method for the preparation of REE nanomaterial.
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title Efficient and Sustainable Regeneration of Bifunctional Ionic Liquid for Rare Earth Separation
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