Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Separation Fe(III)-Mn(II) via Supported Liquid Membrane Technology in the Treatment of Spent Alkaline Batteries

Version 1 : Received: 20 October 2021 / Approved: 21 October 2021 / Online: 21 October 2021 (14:10:48 CEST)

How to cite: Alguacil, F.J.; Lopez, F.A. Separation Fe(III)-Mn(II) via Supported Liquid Membrane Technology in the Treatment of Spent Alkaline Batteries. Preprints 2021, 2021100313 (doi: 10.20944/preprints202110.0313.v1). Alguacil, F.J.; Lopez, F.A. Separation Fe(III)-Mn(II) via Supported Liquid Membrane Technology in the Treatment of Spent Alkaline Batteries. Preprints 2021, 2021100313 (doi: 10.20944/preprints202110.0313.v1).

Abstract

The transport of iron(III) from Fe(III)-Mn(II)-HCl mixed solutions through a flat-sheet supported liquid membrane is investigated, being the carrier phase of Cyanex 923 (commercially available phosphine oxide extractant) dissolved in Solvesso 100 (commercially available diluent), as a function of hydrodynamic conditions, concentration of manganese and HCl in the feed phase, and carrier concentration in the membrane phase. A transport model is derived that describes the transport mechanism, consisting of diffusion through a feed aqueous diffusion layer, a fast interfacial chemical reaction, and diffusion of the Fe(III)-Cyanex 923 complex across the membrane phase. The membrane diffusional resistance (Δm) and feed diffusional resistance (Δf) are calculated from the model, and their values are 145 s/cm and 361 s/cm, respectively. It is apparent that the transport of iron(III) is mainly controlled by diffusion through the aqueous feed boundary layer, being the thickness of this layer calculated as 2.9x10-3 cm. Since Mn(II) is not transported through the membrane phase, the present system allows to the purification of this manganese-bearing solutions.

Keywords

membrane transport; Cyanex 923; iron(III); manganese (II); separation.

Subject

CHEMISTRY, Applied Chemistry

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