| 三正辛胺-仲辛醇-煤油组合液膜分离镉锌的研究 |
| Study on Separation of Binary Cd(Ⅱ)and Zinc(Ⅱ) by a Tri-n-octylamine-Secondary octyl Alcohol-Kerosene Hybrid Liquid Membrane |
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| 摘要: 本文用萃取和膜迁移实验研究了镉、锌离子在三正辛胺-仲辛醇-煤油组合液膜体系中的迁移和分离的影响因素。实验证实,该组合液膜体系能从含镉、锌的料液中选择性地迁移镉,有效地实现镉、锌分离。理论分析表明,组合液膜的双固体膜可简化为具备两张固体膜厚度的单一固体支撑体的支撑液膜。测定了组合液膜因迁移而流失在料液相和反萃相中的三正辛胺含量,实验显示,组合液膜的两张固体支撑体可阻止三正辛胺的流失,增加膜稳定性,延长膜寿命。 |
| 关键词: 组合液膜 锌 镉 三正辛胺 |
| 基金项目: |
| Abstract: In this article, the separation of Cadmium(Ⅱ) and Zinc(Ⅱ) from wasted water by a Tri-n-octylamine(TNOA)-secondary Alcolhol(ROH)-kerosene hybrid liquid membrane(HLM) system was studied. The influence of Cl-, Br-, HNO3 concentration in feed phase, and TNOA concentration in membrane phase on transport and separation were determined through extraction experiment and membrane transport process. The experiments demonstrate that Cd(Ⅱ) can be transported selectively from the binary Cd(Ⅱ) and Zn(Ⅱ) solution and that Cd(Ⅱ) and Zn(Ⅱ) can be separated well. The experiment indicates that the transport percentage of Cd(Ⅱ) exceeds 92% and Zn(Ⅱ) is only 3% when concentration ratio of Cd(Ⅱ) to Zn(Ⅱ) is 1 to 5 in feed phase after transport of 21 hours. Theory analysis shows that double solid membranes of HLM can be treated as a single membrane with twice the geometrical thickness of the polymer support. The uptake of TNOA content from membrane phase into feed phase and stripping phase is de-termined. The experiments show that HLM can prevent TNOA from loss out of membrane phase and prolong the lifetime of liquid membrane. |
| Keywords: hybrid liquid membrane cadmium zinc tri-n-octylamine |
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| 刘新芳,何鼎胜,马 铭,王书媚.三正辛胺-仲辛醇-煤油组合液膜分离镉锌的研究[J].无机化学学报,2003,19(12):1295-1300. |
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