Abstract
Metal separations from various mixtures of alkali metal, alkaline earth metal, Cu/sup 2 +/, Zn/sup 2 +/, Ag/sup +/, Tl/sup +/, and Pb/sup 2 +/ nitrates were studied using an emulsion membrane system. The membrane consisted of a water-in-oil emulsion composed of 0.050 M Li/sub 4/P/sub 2/O/sub 7/ in H/sub 2/O and 0.020 M dicyclohexano-18-crown-6 (DC18C6) in toluene with sorbitan monooleate serving as surfactant. The emulsion was placed into an aqueous source phase solution of the metal nitrates of interest. Of the cations studied, Pb/sup 2 +/ was transported most rapidly and selectively. The selectivity of the system for particular cations is governed by the relative M/sup n+/-DC18C6 and M/sup n+/-P/sub 2/O/sub 7//sup 4 -/ complex stabilities. Formation of a sufficiently stable M/sup n+/-DC18C6 complex is necessary to partition cations into the toluene membrane, and formation of a more stable M/sup n+/-P/sub 2/O/sub 7//sup 4 -/ complex is necessary to strip cations from the membrane into the receiving phase. 17 references, 2 figures, 6 tables.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
