New ion pump technology promises more efficient water desalination

Researchers from the University of California, Irvine, and Tel Aviv University have developed a novel ion pump that efficiently removes salt and heavy metals from water using a low-voltage electrical signal without any moving parts, fuel, or chemical reactions. This ratchet-based ion pump operates via a rapid electrical pulsing that creates a directional flow of ions through a nanoporous membrane sandwiched between ultrathin metal layers. Unlike traditional desalination methods that rely on energy-intensive electrochemical reactions, this solid-state device harnesses structural asymmetry and nanoscale metal-electrolyte interfaces to achieve a steady ion flux with significantly lower energy consumption. In proof-of-concept tests, the system successfully removed 50 percent of salt from water at minimal voltage and maintained ion flow even against opposing forces by integrating ion-selective membranes. The technology’s precision also allows selective removal of toxic heavy metals like lead at trace concentrations without depleting essential minerals, making it highly promising for applications beyond water purification. Potential uses include lithium harvesting