New Material Offers sustainable Solution for “Forever โChemical” Removal
Per- and polyfluoroalkyl substances (PFAS), often called “forever chemicals” due too their persistence inโข the environment, pose aโ significantโ threat toโ global water supplies. Conventional methods for removing theseโ compounds are often inefficient, slow, โฃand generate โฃproblematicโ waste. Tho, researchers at Rice university, โin collaborationโ with Pukyung National University in South Korea, โhave developed a novel material thatโข promises a more effective and sustainable solution for bothโ capturing and destroying PFAS.
The breakthroughโค centers around a layeredโข double โฃhydroxide (LDH) material composed of copper and aluminum. Originally discovered in 2021 by Keon-Ham โKim while a graduate studentโ at theโ Korea Advanced Institute ofโ Science and Technology (KAIST), the material’s potential โwas โคunlocked by โYoungkunโ Chung, a postdoctoral fellow at Rice University. Chung โfound thatโ a specificโ formulation incorporating โnitrate exhibited extraordinary PFAS adsorption capabilities.
“To my astonishment, this LDH compound captured PFAS more than 1,000 times better than other materials,” Chungโ stated. The materialโค also demonstrated remarkable speed,โข removing significant amounts of PFASโ within minutes โข- approximately โข100 times faster than โคconventional carbon filters. This efficiency is attributed to the LDH’s unique structure: organized layers of copperโฃ and aluminum with โinherentโ charge โฃimbalances that strongly attract PFAS molecules.
Testing in various water sources – including river water,โข tap water, andโฃ wastewater – confirmed the material’s effectiveness in both static and continuous-flow systems, suggesting its suitability for large-scale applications like municipal water treatment and industrial โcleanup.
Beyond simply removingโฃ PFAS, the researchโ team, including Rice professors Pedro Alvarez and Jamesโ Tour, developedโข a method for its destruction. By heatingโ the PFAS-saturated LDH material with calcium carbonate, they wereโ able to eliminate over half of the capturedโฃ PFAS withoutโ creating harmful byproducts.Crucially, the process also โขregenerates the LDH material, allowing โfor repeated use.โ
Preliminary results indicate the material can endure at least six cycles ofโ capture, destruction, and renewal,โฃ marking the first โknown eco-pleasant and sustainable system for complete PFAS management. โ
“Weโ are excited by theโ potential of thisโข one-of-a-kind LDH-based technology to transform howโค PFAS-contaminated water sources โare treated in the near โfuture,” said Michael S. Wong,โ a professor at Rice โขUniversity’s George R. Brown School of engineering and Computing.
The research wasโค supportedโฃ by funding from โขthe Nationalโข Research Foundation of Korea, the National Convergence Research of Scientific Challenges, the Sejong Science Fellowship, Saudi โฃAramco-KAIST CO2 Management, the Nanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatment (NEWT), the USโ Army Corps โof Engineers’ Engineering Research and Progress Center, the Rice โคsustainability Institute, andโค the Rice WaTER Institute.