Transport of Metal Ions Across Bulk Liquid Membrane With MacroCycle Compounds

Oumran Mussa, Yussra; Muosa Dhababe, Jameel; Gased Jalhoom, Moayyed

	Transport of Metal Ions Across Bulk Liquid Membrane With MacroCycle Compounds
Iraqi National Journal Of Chemistry
Article 1, Volume 0, Issue 51, 2014, Pages 247-263
Authors
Yussra Oumran Mussa; Jameel Muosa Dhababe; Moayyed Gased Jalhoom
Abstract
Abstract The transport experiments of Pb2+,Cd2+ and Zn2+ metal cations were performed by dibenzo-18- crown -6 , dicyclo18-crown-6 , kryptofix 2.2.2 and diaza 18-crown -6 using 1,2- Dichtoro ethane , chloroform and carbon tetra chloride as liquid membrane , The aqueous source phase consisted of 10-3M of Metals nitrate in 10 ml of double distilled deionized water at PH = 5.2 – 5.5 and the receiving phases consisted of 10 ml double distilled deionizer water at PH = 3.2-3.7 . The effects of operating conditions , stirring speed , type of carrier structure and solvents in the feed and strip phase were studied . From the results that the transport rate of Pb2+, Cd2+ and Zn2+ metal cations can be enhanced by increasing stirring speed but not very high , dicyclohexyl-18-crown-6 is the best carrier structure and du to the effect cyclohexhl which is electron donating group, 1,2- di chloro ethane was found the best set solvent according to permeability and flux data du to its polarity constants Also , the transport rate efficiency observed of cations the selectivity of cations is Pb2+ , Cd2+ and Zn2+ which are appreciable with the value of its hydration energy and the Pearson,s Hard Soft Acid Base principle (HSAB).
Keywords
Bulk Liquid Membrane; Crown Ethers; Diaza; Crown

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