Cheaper method removes harmful ‘forever chemicals’ from water

Ziyi “Bruce” Meng tests samples of water to see how effective a new electrocatalysis technique is at remediating perfluorooctane sulfonate (PFOS) pollution. PFOS was once widely used for stain-resistant products but is now banned in much of the world. (Credit: J. Adam Fenster/U. Rochester)

Researchers have developed new electrochemical approaches to clean up pollution from “forever chemicals” found in clothing, food packaging, firefighting foams, and a wide array of other products.

A new study published in the Journal of Catalysis describes nanocatalysts developed to remediate per- and polyfluoroalkyl substances, known as PFAS.

The researchers focused on a specific type of PFAS called perfluorooctane sulfonate (PFOS), which was once widely used for stain-resistant products but is now banned in much of the world for its harm to human and animal health. PFOS is still widespread and persistent in the environment despite being phased out by US manufacturers in the early 2000s, continuing to show up in water supplies.

Astrid Müller, a professor of chemical engineering at the University of Rochester, and her team of materials science PhD students created the nanocatalysts.

“Using pulsed laser in liquid synthesis, we can control the surface chemistry of these catalysts in ways you cannot do in traditional wet chemistry methods,” Müller says. “You can control the size of the resulting nanoparticles through the light-matter interaction, basically blasting them apart.”

The scientists then adhere the nanoparticles to carbon paper that is hydrophilic, or attracted to water molecules. That provides a cheap substrate with a high surface area. Using lithium hydroxide at high concentrations, they completely defluorinated the PFOS chemicals.

For the process to work at a large scale, the researchers will need to treat at least a cubic meter at a time, Müller says. Crucially, their novel approach uses all nonprecious metals, unlike existing methods that require boron-doped diamond. By their calculations, treating a cubic meter of polluted water using boron-doped diamond would cost $8.5 million; the new method is nearly 100 times cheaper.

In future studies, Müller hopes to understand why lithium hydroxide works so well and whether even less expensive, more abundant materials can be substituted to bring the cost down further. She also wants to apply the method to an array of PFAS chemicals that are still prevalently used but have been linked to health issues ranging from development in babies to kidney cancer.

Despite their issues, outright banning all PFAS chemicals and substances is not practical because of their usefulness in not only consumer products, but in green technologies as well, she says.

“I would argue that in the end, a lot of decarbonization efforts—from geothermal heat pumps to efficient refrigeration to solar cells—depend on the availability of PFAS,” says Müller. “I believe it’s possible to use PFAS in a circular, sustainable way if we can leverage electrocatalytic solutions to break fluorocarbon bonds and get the fluoride back out safely without putting it into the environment.”

Although commercialization is a long way off, Müller filed a patent with support from URVentures, and foresees it being used at wastewater treatment facilities and by companies to clean up contaminated sites where they used to produce these PFAS chemicals. She also calls it a social justice issue.

“Often in areas with lower income across the globe, there’s more pollution,” says Müller. “An advantage of an electrocatalytic approach is that you can use it in a distributed fashion with a small footprint using electricity from solar panels.”

Source: University of Rochester