Researchers Developed Light-Controlled Ion Separation Membrane
New three-layer membrane uses light and voltage to refine raw material processing by separating specific ions.
Updated on Sept. 28, 2026 in Energy
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Researchers at the Max Planck Institute of Colloids and Interfaces and the University of Alberta have developed a membrane that uses light and electrical voltage to separate ions. The development, which exists as research-stage technology, enables high-selectivity filtration between monovalent and divalent ions.
Why it matters
This technology provides a new method for the extraction and recovery of raw materials by effectively filtering ions with different positive charges. It offers a path to improving chemical processing efficiency by leveraging photoactive materials to modulate ion transport.
The three-layer membrane utilizes carbon nitride as a photoactive component to achieve 200-fold selectivity for lithium over magnesium and 500-fold for potassium over magnesium. These performance figures represent the capacity of the material to isolate monovalent ions from divalent alternatives.
The players
Max Planck Institute of Colloids and Interfaces
A German research organization focused on complex material structures and surface science.
University of Alberta
A Canadian public research university known for its extensive work in chemical engineering and materials science.
The details
The membrane functions by exploiting differences in ion hydration and charge interactions within nanochannels—sub-nanometer-scale pores that regulate molecular flow. Researchers activate these channels by illuminating the membrane while simultaneously applying an electric bias, which alters the electrical conditions inside the channels. This physical process effectively creates a selective gate that favors ions with a single positive charge over those with two, such as magnesium.
Timeline
September 28, 2026: The research findings were published in the journal Angewandte Chemie.
The Tech Race
This research follows a pattern set by the Max Planck Institute of Colloids and Interfaces membrane development program in the pursuit of more efficient material separation. It sits within a broader landscape of efforts to optimize ion-selective membranes for industrial mineral recovery and chemical processing.
This development is currently research-stage and does not yet affect commercial mineral processing workflows. Its potential application remains limited to future industrial recovery processes for lithium and other raw materials.
The takeaway
This study demonstrates that combining light stimulation with electrical potential can dramatically increase ion selectivity. Readers should watch for future pilot-scale testing of these membrane architectures to see if the selectivity holds up outside of laboratory conditions.
Further reading
For more on the developments in chemical material processing, see Energy.
More information
View the scientific study publication for complete technical data.
Live Poll
Do you believe breakthroughs in ion separation technology will improve the nation's raw material recovery?
