Rice University researchers recently developed a new material that can be used to capture carbon dioxide from the atmosphere. This material is made of hexagonal boron nitride (h-BN) and polyvinyl alcohol (PVA). The foam captures carbon dioxide and releases the gas as needed, allowing the sponge to be reused. To make the material, the team freeze-dried the two-dimensional hexagonal boron nitride sheet and expanded it into a 3D foam.

In this state, the hexagonal boron nitride is still quite fragile and easily dissolved in liquids, so the researchers added polyvinyl alcohol. They mix the gelatinous material with the hexagonal boron nitride flakes, and when the solution is freeze-dried, the hexagonal boron nitride flakes form a "checkered pattern" held together by the PVA.

Chandra Sekhar Tiwary, co-author of the study, said: “Even if it is a very small amount of polyvinyl alcohol, it helps.” It helps to harden the foam by bonding the interconnects between the hexagonal boron nitride sheets, while hardly Change the surface area. ”

To simulate the dynamics of this material molecule, the team found that the foam can absorb up to 340% of its own weight of carbon dioxide, which can then be evaporated off. In this way, the materials can be reused and, after compression tests, become harder after 2000 cycles.

The researchers said that because of their reusability, the freeze-drying manufacturing process is also very simple, so the production can be expanded. If the team can develop a way to control the size of the holes, this material will be expected to be used in air filters.

The research was published in the ACS Nano magazine.

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