PFAS contamination has spread into groundwater, surface water, and drinking supplies across the globe, affecting millions of people. Now, scientists at Flinders University in Australia have developed a novel filtration material that can remove up to 98% of these so-called "forever chemicals" — including the short-chain varieties that have long eluded existing treatment methods.
The breakthrough, reported by Science Daily, centers on a nano-sized molecular cage designed to act as a highly selective PFAS trap. Unlike traditional adsorbent materials, these cages work by forcing short-chain PFAS molecules to cluster together inside their cavities, creating an unusually strong binding mechanism. Short-chain PFAS are more mobile in water and have been a major unresolved challenge for water treatment engineers.
"We discovered that a nano-sized cage captures short-chain PFAS by forcing them to aggregate favourably inside its cavity," said project leader Dr. Witold Bloch of Flinders University's College of Science and Engineering. To make the system practical, the team embedded the molecular cages into mesoporous silica — a porous material that on its own does not bind PFAS.
The key to the design was understanding exactly how PFAS molecules interact with the cage at a molecular level. "That allowed us to understand the precise binding behaviour and then use that knowledge to design an effective adsorbent for PFAS removal," said first author Caroline Andersson, a PhD candidate in chemistry at Flinders.
Laboratory tests in model tap water showed the material eliminated up to 98% of PFAS at environmentally relevant concentrations. Crucially, the adsorbent remained highly effective after multiple uses, suggesting it could be practical for real-world filtration systems. The findings, published in the journal Angewandte Chemie International Edition, could pave the way for more effective and affordable water purification worldwide.
