Tween-80-(NH4)2SO4-XO体系中铜、镧、铀、铈光谱及萃取性能研究

利用二甲酚橙作萃取剂 ,在吐温 80 (NH4 ) 2 SO4 二甲酚橙 (XO)固 液萃取体系中 ,研究了萃取相 (固相 )中金属离子络合物吸收光谱 ,与XO光谱比较 ,Cu(Ⅱ ) ,U(Ⅵ ) ,Ce(Ⅳ )离子吸光度增大 ,最大吸收波长红移 2 0～ 30nm ;La(Ⅲ )离子几乎未变。同时探讨了该体系中不同酸度、不同盐用量、不同萃取剂用量、不同类型表面活性剂 ,对Cu(Ⅱ ) ,La(Ⅲ ) ,U(Ⅵ ) ,Ce(Ⅳ )离子的萃取率的影响 ,在pH 6 0的酸度下 ,实现了La(Ⅲ )与U(Ⅵ )之间的萃取分离。

Study on the Spectra and Extractive Performance of Copper,Lanthanum,Uranium and Cerium by Tween-80-(NH4)2SO4-Xylenol Orange System

In a Tween 80-(NH4)2S04-xylenol orange liquid-solid extraction system, absorption spectra of complexes of metal ions in extraction phase with xylenol orange as the extractant were investigated. Compared to xylenol orange spectra, the maximum wavelength of complexes of Cu(II), U(VI) and Ce(IV) shifted to the red by 20-30 nm, while that of La (III) did not. With different acidity, quantites of xylenol orange and salt, and surfactant, the efficiencies of Cu(II), La(III), U(VI) and Ce(IV) metal ions were discussed. The results indicated that the complexes of Cu(II) and U(VI) with xylenol orange were almost completely extracted by the Tween-80 phase, that of Ce(IV) was partially extracted, while that of La(III) was not extracted from the aqueous solution of pH 6.0. The extraction separation of La(III) and U(VI) was carried out by controlling the solution acidity.