Researchers at the University of Queensland developed a molecular separation membrane that improves transport speed while maintaining selectivity, achieving a tenfold improvement in ethanol and water separation accuracy compared to standard filtration
Chemical engineers in Brisbane tackled a foundational bottleneck in membrane science by redesigning sub-nanometre channels. Traditional filtration setups force a strict compromise: as molecules move faster through a barrier, precision plummets. The University of Queensland team bypassed this friction-and-adhesion trade-off by integrating self-rotating ammonium ions inside channels measuring less than one nanometre wide.
Professor Xiwang Zhang, director of the UQ Dow Centre for Sustainable Engineering Innovation and the ARC Centre of Excellence for Green Electrochemical Transformation of Carbon Dioxide, led the development. He likened the self-rotating molecular environment to a high-speed turnstile. The mechanism regulates traffic while sustaining rapid flow, reducing the adhesive barriers that typically slow down industrial fluid transport.
Tenfold Accuracy Gains in Ethanol-Water Separation Trials
Laboratory experiments involving ethanol and water mixtures quantified the performance leap. The modified membrane increased water transport by approximately 44 per cent while cutting ethanol passage by 90 per cent. These figures represent a tenfold improvement in separation accuracy over standard commercial filtration membranes.
The innovation targets energy-intensive industrial processes where separating specific molecules dictates operational overhead. Chemical purification, resource recovery, and sustainable fuel production rely heavily on these separation steps. By upgrading the internal molecular highways without altering the fundamental size or base chemistry of the channels, the system achieves speed and selectivity simultaneously.
Pathways to Industrial Scale and Carbon Utilization
The research team’s immediate objective involves translating the laboratory-scale membrane into practical industrial applications. Potential deployment sectors extend beyond chemical refining into carbon dioxide utilisation and broader environmental protection frameworks.
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