This article has been reviewed according to Science X's editorial process and policies. Editors have highlighted the following attributes while ensuring the content's credibility: A review by Tohoku University researchers identifies key molecular features that could guide the development of more effective materials for removing PFAS from water. The study is published in the journal ACS Materials Au.
Per- and polyfluoroalkyl substances (PFAS) are used in a wide range of industries, from semiconductor manufacturing and firefighting to textiles and food packaging. Their chemical stability and ability to repel water and oil make them useful in many applications. However, concerns about the potential health effects of some PFAS have increased the need for effective ways to remove these chemicals from water.
One promising approach is adsorption, in which PFAS molecules attach to the surface of a material called an adsorbent. By tailoring these materials to interact with specific PFAS molecules, researchers aim to improve their ability to capture these persistent chemicals from water. A research team led by Kouki Oka, associate professor at Tohoku University's Institute of Multidisciplinary Research for Advanced Materials, reviewed current research and development in PFAS adsorption.
The review examines well-studied compounds, including perfluorooctanesulfonic acid (PFOS) and perfluorooctanoic acid (PFOA), alongside other PFAS covered by regulatory and monitoring frameworks in the European Union (EU) and Canada. The team identifies key principles for designing high-performance adsorbents that can target a wider range of PFAS. A central finding is that effective adsorbent design requires understanding the different parts of a PFAS molecule.
PFOS and PFOA, for example, each contain a fluorinated carbon chain and a terminal group that is typically charged in aqueous environments. These parts have different chemical properties and can interact with adsorbent materials in different ways. By designing materials that interact strongly with these different structural features, researchers may be able to improve adsorption performance.
Rather than treating a PFAS molecule as a single target, this approach considers its individual components to guide the selection and design of suitable adsorbents. "As the range of PFAS subject to regulation continues to expand, we need adsorbents that can effectively target a wider variety of these compounds. By understanding how different parts of PFAS molecules interact with adsorbent materials, we can establish clearer design principles for developing more effective removal technologies," says Oka.
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