以正十六胺为载体的乳状液膜迁移分离镉(Ⅱ)

Separation of Cadmium Through an Emulsion Liquid Membrane Using Hexadecylamine as Mobile Carrier

研究表明 ,当膜相为 0 30mol/L正十六胺浓度和Span 80质量分数为 3 8%的煤油溶液 ;内相为0 0 2 0mol/L的NaOH溶液 ;外相为 0 0 2 0mol/L的KI和 0 0 10～ 0 10mol/L的HCl溶液时 ,3min即能使Cd(Ⅱ )的迁移率达 99%以上。在合适的条件下 ,Fe(Ⅲ )、Zn(Ⅱ )、Co(Ⅱ )、Ni(Ⅱ )、Al(Ⅲ )、Cr(Ⅲ )、Mn(Ⅱ )等离子对此不产生干扰 ,RSD一般为 3%左右。

The transportation of Cd(Ⅱ) ions through a liquid membrane comsisted of hexadecylamine(RNH 2), sorbital monooleate(Span 80) and kerosene has been studied as function of concentration of HCl, KI, hexadecylamine, Span 80 and NaOH in the feed, membrane and stripping solutions. The maximum transportation of Cd 2+ was observed when the liquid membrane is consisted of outer phase 0 010～0 050 mol/L HCl and 0 020 mol/L KI, membrane phase 0 020～0 030 mol/L RNH 2, 3 8%(mass fraction) Span 80 plus kerosene, and inner phase 0 010～0 030 mol/L NaOH. Cadmium ion could be separated completely from Fe(Ⅱ), Zn(Ⅱ), Co(Ⅱ), Ni(Ⅱ), Zn(Ⅱ), Al(Ⅲ), Cr(Ⅳ), Mn(Ⅱ). The transportation mechanism of the metal ions through the membrane has been discussed.