Researchers at the University of Utah have developed a lower-temperature destruction method using nucleophiles to break down per- and polyfluoroalkyl substances, or PFAS, releasing nearly all fluorine as fluoride at temperatures of 110 degrees Celsius or below. Phys.org reported that this laboratory technique targets collected forever chemicals to prevent contamination from shifting into secondary waste streams.
Severing Carbon-Fluorine Bonds at Mild Temperatures
Per- and polyfluoroalkyl substances resist natural breakdown because of their exceptionally strong carbon-fluorine bonds. Ling Zang, distinguished professor in the Department of Materials Science & Engineering and Associate Dean for Research at the Price College of Engineering, led the study. The research team deployed reactive chemicals known as nucleophiles to attack these stubborn molecular structures. This defluorination process successfully stripped fluorine from several targeted compounds.
PFOA and trifluoroacetic acid underwent defluorination during the tests. The method also released fluoride efficiently from two common fluorinated plastics, PVDF and PCTFE. These materials appear regularly in industrial products, batteries, and munitions.
Researchers Destroy Chemical Pollutants at Low Temperatures
Traditional PFAS destruction typically relies on incineration temperatures reaching 1,000 degrees Celsius or higher. Incineration carries distinct operational hazards. Incomplete thermal breakdown can generate secondary pollutants, including volatile smaller fluorinated compounds that disperse easily through the atmosphere.
The University of Utah team conducted most tests at 110 degrees Celsius or lower, though select materials required up to 150 degrees Celsius. The process runs in ordinary air. It eliminates the need for inert gas atmospheres, heavy-metal catalysts, deep-ultraviolet irradiation, highly reactive alkali metals, externally applied high pressure, and energy-intensive mechanical processing.
| Destruction Method | Typical Operating Temperature | Required Environmental Inputs |
|---|---|---|
| Conventional Incineration | 1,000°C or higher | |
| Nucleophilic Defluorination | 110°C to 150°C | Ordinary air, reactive nucleophile chemicals |
Real Waste Streams Await Future Testing
Capturing PFAS from contaminated water and concentrating the pollutants into a manageable waste stream forms the first half of the remediation puzzle. Destroying the collected material safely finishes the cycle. The current method remains strictly at the laboratory stage.
Future research phases will test alternative reagents, assess treatment costs, and determine the safety of remaining residual products. The team also plans to evaluate how the technique performs when exposed to real waste streams.
