Specific membrane transport of silver and copper as Ag(CN)32- and Cu(CN)43- ions through a supported liquid membrane using K+-crown ether as a carrier
Specific membrane transport of silver and copper as Ag(CN)32- and Cu(CN)43- ions through a supported liquid membrane using K+-crown ether as a carrier
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DOI：
10.1016/s0011-9164(02)00975-x
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发表时间：
2003-01-02
期刊：
影响因子：
9.9
通讯作者：
Kerdjoudj, H
中科院分区：
文献类型：
--
作者：
Gherrou, A;Kerdjoudj, H
研究了以K+-冠醚为载体的支撑液膜（SLM）对氰化物溶液中银和铜的迁移行为。使用的SLM是用溶解在乙醇/氯仿（v/v）混合物中的二苯并-18-冠-6（DB 18 C6）、二氮杂-18-冠-6（DA 18 C6）、六硫杂-18-冠-6（HT 18 C6）和六氮杂-18-冠-6（HA 18 C6）浸渍的薄多孔聚丙烯（Celgard 2500，2400）膜。K+-冠醚表现出高效率的银和铜作为Ag（CN）（3）（2-）和Cu（CN）（4）（3-）物种通过SLM的3。然而，当n从2增加到4时，由于络合物M（CN）（n）（n-）（M = Ag，Cu）的稳定性的差异，当进料相中的氰根离子浓度增加时，银和铜离子的质量通量都降低。这与使用理论模型在水相中的物种的分配有关。
Facilitated transport of silver and copper from cyanide solutions through a supported liquid membrane (SLM) containing K+-crown ether as a carrier is described. The SLM used is a thin porous polypropylene (Celgard 2500, 2400) membrane impregnated with dibenzo-18-crown-6 (DB18C6), diaza-18-crown-6 (DA18C6), hexathia-18-crown-6 (HT18C6) and hexaaza-18-crown-6 (HA18C6) dissolved in a mixture of ethanol/chloroform (v/v). K+-crown ether showed a high efficiency to carry silver and copper as Ag(CN)(3)(2-) and Cu(CN)(4)(3-) species through the 3 of SLM. However, the mass flux of both silver and copper ions decreases when concentration cyanide ions in the feed phase increases due to the difference in stability of the complexes M(CN)(n)(n-) (M = Ag, Cu) when n increases from 2 to 4. This was related to the partition of the species in the aqueous phase using a theoretical model.