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Capturing carbon dioxide (COâ‚‚) from industrial processes is a necessary step to achieve net-zero greenhouse gas emissions and minimize the severe impacts of climate change. A new report from the University of Nottingham explains that sponge-like pellets may hold the key to preventing COâ‚‚ from entering the atmosphere, supporting future net zero ambitions.

The study, in the Chemical Engineering Journal, explored the use of novel sponge-like materials which can trap CO₂, preventing it from entering the atmosphere from sources such as power plants.

These advanced materials are known as magnetic framework composites (MFCs), which combine two components: porous materials called metal-organic frameworks (MOFs) that trap COâ‚‚, and magnetic nanoparticles, which allow the material to be heated efficiently using magnetic fields to release the captured gas for storage or further use.

Until now, the focus of research on these materials has been on their powder form, which isn't practical for real-world applications. To address this, the researchers in this study developed a method to shape the MFC powders into small, strong pellets using different polymer binders. They then tested how these different formulations affected the material's ability to absorb COâ‚‚, its strength, and its heat transfer properties.

The results showed that some binders, such as polyvinyl alcohol (PVA), substantially increased the mechanical strength of the pellets, with just 4% binder resulting in a 107% increase in pellet strength. The inclusion of magnetic nanoparticles was also found to significantly improve how well the materials can transfer heat, which is important for making the COâ‚‚ capture and release process more energy efficient.

This work is an important step toward making these materials suitable for large-scale COâ‚‚ capture technologies, helping to reduce industrial carbon emissions and supporting climate change mitigation efforts.

"This exciting research brings us closer to developing scalable, energy-efficient carbon capture technologies. By improving the strength and thermal performance of these materials, we're opening up routes for their use in industrial applications, helping to prevent COâ‚‚ emissions at source," says Dr. Luke Woodliffe, Research Fellow in Complex Hydrides.