Rate and mechanism of facilitated americium(III) transport through a supported liquid membrane containing a bifunctional organophosphorous mobile carrier

Autor:	E. P. Horwitz, P. R. Danesi, P. G. Rickert
Rok vydání:	1983
Předmět:	Membrane Aqueous solution Membrane permeability Facilitated diffusion Chemistry Diffusion Mass transfer Inorganic chemistry General Engineering Semipermeable membrane Physical and Theoretical Chemistry Membrane transport
Zdroj:	The Journal of Physical Chemistry. 87:4708-4715
ISSN:	1541-5740 0022-3654
DOI:	10.1021/j100246a033
Popis:	The facilitated transport of Am(III) from aqueous nitrate solutions to formic acid aqueous solutions through a supported liquid membrane (SLM) is described. The supported liquid membrane consists of a solution of a new (carbamoylmethyl)phosphine oxide in diethylbenzene (DEB) absorbed into a 48 ..mu..m thick microporous polypropylene film. The transport mechanism consists of a diffusion process through an aqueous diffusion film, a fast interfacial chemical reaction, and diffusion through the membrane itself. Equations describing the rate of transport are derived. They correlate the membrane permeability coefficient to diffusional parameters and to the chemical composition of the system. Different rate-controlling processes are shown to control the membrane permeability when the composition of the system is varied and as long as the transport occurs. The experimental data are quantitatively explained with the derived equations. The diffusion coefficient of the permeating species and the equilibrium constant of the fast interfacial reactions are evaluated. 13 figures, 1 table.
Databáze:	OpenAIRE
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