ScholarLens Back to search
1984•Solvent Extraction and Ion ExchangeRequires access

CATION SELECTIVITY IN A TOLUENE EMULSION MEMBRANE SYSTEM

Reed M. Izatt, David V. Dearden, Evan R. Witt, Don W. McBride, James J. Christensen

Open publisher page 7 citations

Abstract

Metal separations from various mixtures of alkali metal, alkaline earth metal, Cu2+, Zn2+, Ag+, Tl+, and Pb2+ nitrates were studied using an emulsion membrane system. The membrane consisted of a water-in-oil emulsion composed of 0·050 M LI4P2O7 In H2O 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, Pb2+ was transported most rapidly and selectively. The selectivity of the system for particular cations is governed by the relative Mn+-DC18C6 and Mn+-P2O7 4− complex stabilities. Formation of a sufficiently stable Mn+-DC18C6 complex is necessary to partition cations into the toluene membrane, and formation of a more stable Mn+-P2O7 4− complex is necessary to strip cations from the membrane into the receiving phase.

About this research paper

What this paper is about

Metal separations from various mixtures of alkali metal, alkaline earth metal, Cu2+, Zn2+, Ag+, Tl+, and Pb2+ nitrates were studied using an emulsion membrane system. The membrane consisted of a water-in-oil emulsion composed of 0·050 M LI4P2O7 In H2O 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, Pb2+ was transported most rapidly and selectively. The selectivity of the system for particular cations is governed by the relative Mn+-DC18C6 and Mn+-P2O7 4− complex stabilities. Formation of a sufficiently stable Mn+-DC18C6 complex is necessary to partition cations into the toluene membrane, and formation of a more stable Mn+-P2O7 4− complex is necessary to strip cations from the membrane into the receiving phase.

Why it matters

OpenAlex reports 7 citations for this work. Citation counts describe recorded attention and do not establish research quality.

Key contribution

A contribution statement is not available in the OpenAlex record.

Method / approach

Method details are not available in the OpenAlex metadata.

Main findings

Findings are not separately available in the OpenAlex metadata.

Limitations

Limitations are not available in the OpenAlex metadata.

Applications

Application details are not available in the OpenAlex metadata.

Available abstract

Metal separations from various mixtures of alkali metal, alkaline earth metal, Cu2+, Zn2+, Ag+, Tl+, and Pb2+ nitrates were studied using an emulsion membrane system. The membrane consisted of a water-in-oil emulsion composed of 0·050 M LI4P2O7 In H2O 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, Pb2+ was transported most rapidly and selectively. The selectivity of the system for particular cations is governed by the relative Mn+-DC18C6 and Mn+-P2O7 4− complex stabilities. Formation of a sufficiently stable Mn+-DC18C6 complex is necessary to partition cations into the toluene membrane, and formation of a more stable Mn+-P2O7 4− complex is necessary to strip cations from the membrane into the receiving phase.

Key concepts: Chemistry, Toluene, Emulsion, Selectivity, Membrane, Inorganic chemistry, Alkali metal, Metal

Related papers

Related paper 1Related paper 2Related paper 3
Back to paper searchBrowse research topicsOriginal source
CATION SELECTIVITY IN A TOLUENE EMULSION MEMBRANE SYSTEM — Research Paper | ScholarLens