Rice Engineers Built a Better PFAS Killer

Forever chemicals have a well-earned reputation for sticking around. Found in drinking water systems across the country, PFAS (per- and polyfluoroalkyl substances) have been linked to cancer, immune problems, and developmental harm. Conventional filters can catch them, but that just moves the problem somewhere else, leaving utilities saddled with toxic waste they still have to manage.

A team at Rice University thinks it has a better idea. Their new material, a copper-aluminum layered double hydroxide, doesn't just trap PFAS. It destroys them. In lab testing, it captured forever chemicals more than 1,000 times more effectively than standard filters and worked roughly 100 times faster than commercial activated carbon. It held up across river water, tap water, and wastewater, including in continuous-flow setups designed to mimic real treatment plant conditions.

Here's where it gets interesting. Once the material is loaded with PFAS, heating it alongside calcium carbonate breaks down more than half the captured chemicals without producing harmful byproducts. That same heating step refreshes the material for reuse. Researchers confirmed at least six full cycles of capture, destruction, and renewal, a result that suggests the system could hold up over time in ways that matter to budget-conscious utilities.

"Current methods for PFAS removal are too slow, inefficient and create secondary waste," said Professor Michael S. Wong, who mentored the project. "Our new approach offers a sustainable and highly effective alternative."

The timing matters. U.S. water utilities are now staring down mandatory EPA compliance deadlines for six PFAS compounds, and pressure is mounting to find solutions that eliminate contamination rather than shuffle it around. The research, published in Advanced Materials and conducted alongside scientists at the Korea Advanced Institute of Science and Technology and Pukyung National University, has already drawn industry attention.

Full-scale municipal deployment is still a ways off, and real-world engineering work remains. But a single material that captures, destroys, and regenerates in one cycle could fundamentally change the economics of PFAS cleanup. For utilities facing tighter rules and tighter budgets, that's a combination worth watching.