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支撑液膜在水溶液金属离子的分离中有着独特的优势 .报道了从Fe3+/Cu2 +溶液中选择分离Fe3+液 /液萃取研究结果 .水相为Fe3+/Cu2 +硫酸溶液 ,萃取相为正癸醇 (n -de canol) ,载体为二 (2 -乙基己基 )磷酸 (D2EHPA) .实验研究了溶液相中硫酸浓度以及有机相中载体D2EHPA浓度对金属离子萃取速率的影响 .研究发现水溶液的酸浓度对Fe3+的萃取影响较明显 ,而对Cu2 +的萃取影响很小 .在两相界面处Fe3+与D2EHPA的反应速度比Cu2 +快很多 .Fe3+、Cu2 +与D2EHPA的络合物在有机相中的扩散速度都较慢 ,但是Fe3+与D2EHPA的络合物的界面反应速度比络合物的扩散速度快 .有机相中载体浓度对金属离子萃取速率的影响也很明显 .液液萃取研究结果显示 ,在使用支撑液膜进行铁离子选择分离时 ,可以通过改变溶液相酸的浓度 ,有机相中载体浓度 ,或者通过缩短分离时间来提高选择率 .
The support liquid film has unique advantages in the separation of metal ions in aqueous solution, and the results of Fe3 + / Cu2 + solution separation and Fe3 + / liquid extraction are reported. The aqueous phase is Fe3 + / Cu2 + sulfuric acid solution and the extraction phase is n-decanol (2-ethylhexyl) phosphoric acid (D2EHPA) was studied.The concentration of sulfuric acid in the solution phase and the concentration of D2EHPA in the organic phase on the extraction rate of metal ions were investigated.The results showed that the concentration of acid Fe3 + and D2EHPA reacted much faster than Cu2 + at the interface of the two phases.The complex of Fe3 +, Cu2 + and D2EHPA in the organic phase , But the interface reaction between Fe3 + and D2EHPA complex is faster than that of complex.The effect of carrier concentration in organic phase on extraction rate of metal ions is also obvious.The results of liquid-liquid extraction In the selective separation of iron ions using a supporting liquid film, the selectivity can be increased by changing the concentration of the solution phase acid, the concentration of the carrier in the organic phase, or by shortening the separation time.