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Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes

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High-flux ultrasonic processing for lithium separation using ionic liquid impregnated composite membranes.

Behrang Golmohammadi¹, Hemayat Shekaari¹

¹Department of Physical Chemistry, Faculty of Chemistry, University of Tabriz, Tabriz 5166616471, Iran.

Ultrasonics Sonochemistry

|July 2, 2024

Summary

Ultrasonic-assisted membrane processing enhances lithium extraction from spent battery brines. This method optimizes ionic liquid membranes and ultrasonic conditions for efficient lithium recovery, crucial for the battery industry.

Keywords:

Alkali metal brine Composite membrane Ionic liquid membrane Lithium separation Ultrasonic assisted membrane separation

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Area of Science:

Materials Science
Chemical Engineering
Environmental Science

Background:

The battery industry's demand for lithium necessitates efficient recovery methods.
Spent battery materials contain valuable lithium resources in brine form.
Current lithium extraction methods face challenges in efficiency and environmental impact.

Purpose of the Study:

To develop and investigate an ultrasonic-assisted membrane process for lithium separation from simulated brine.
To explore the influence of membrane composition, feed concentration, and ultrasonic parameters on lithium extraction efficiency.
To elucidate the mechanism behind enhanced lithium transport facilitated by ultrasonic waves.

Main Methods:

Utilized a composite ionic liquid membrane (ILM) with polysulfone (PSF) support and a PVC membrane for ILM retention.
Investigated the effects of varying ultrasonic frequencies (optimal around 250 kHz), amplitude, and pulse cycle settings.
Tested lithium separation from alkali metal chlorides across feed concentrations from 250 to 1000 ppm.

Main Results:

Optimal ultrasonic frequency of ~250 kHz significantly enhanced lithium separation efficiency.
Higher frequencies and optimized ultrasonic settings improved lithium flux and selectivity.
Increased feed concentrations (250-1000 ppm) resulted in higher lithium flux and selectivity.
Ultrasonic effects, including microbubble formation and cavitation, were identified as key to enhanced lithium transport.

Conclusions:

Ultrasonic-assisted membrane processing offers a promising route for efficient lithium recovery from brines.
The developed composite membrane and optimized ultrasonic conditions demonstrate high lithium flux and selectivity.
This technology holds potential for sustainable lithium sourcing from spent battery materials.