Filtering PFAS

The article taht inspired this cover describes how Di Palma's and Jinscheck's team developed a special gel made from zirconium terephthalate to help clean water contaminated with PFAS, which are often found in everyday products and can linger in the environment for decades. The gel is a type of metal-organic framework (MOF), structured at the nanoscale to create a highly porous material that can trap and hold onto pollutants much more effectively than traditional water filters.

The team tested their gel with water containing perfluorooctanoic acid (PFOA), a common and persistent PFAS. Through a series of lab experiments, they found that their gel could remove roughly 96% of PFOA from water, capturing the contaminant within its structure and making it easy to separate the clean water from the gel. Importantly, the gel’s design makes it sturdier and simpler to handle than conventional MOF powders, which are often messy and challenging to use in real filtration systems.

As a final demonstration, the team turned their gel into a membrane and used it as a filter in a small-scale setup. Even after multiple rounds of filtering contaminated water by just letting gravity do the work, the gel consistently removed over 93% of PFOA each time. This approach could provide a practical way to improve water purification, tackling pollution in a form that can be adapted for larger-scale use while keeping maintenance straightforward.