Department of Chemistry, University of California, Berkeley, CA, USA.
Kavli Energy NanoScience Institute, University of California, Berkeley, CA, USA.
Nature. 2024 Nov;635(8037):96-101. doi: 10.1038/s41586-024-08080-x. Epub 2024 Oct 23.
Capture of CO from the air offers a promising approach to addressing climate change and achieving carbon neutrality goals. However, the development of a durable material with high capacity, fast kinetics and low regeneration temperature for CO capture, especially from the intricate and dynamic atmosphere, is still lacking. Here a porous, crystalline covalent organic framework (COF) with olefin linkages has been synthesized, structurally characterized and post-synthetically modified by the covalent attachment of amine initiators for producing polyamines within the pores. This COF (termed COF-999) can capture CO from open air. COF-999 has a capacity of 0.96 mmol g under dry conditions and 2.05 mmol g under 50% relative humidity, both from 400 ppm CO. This COF was tested for more than 100 adsorption-desorption cycles in the open air of Berkeley, California, and found to fully retain its performance. COF-999 is an exceptional material for the capture of CO from open air as evidenced by its cycling stability, facile uptake of CO (reaches half capacity in 18.8 min) and low regeneration temperature (60 °C).
从空气中捕获 CO 为应对气候变化和实现碳中和目标提供了一种很有前景的方法。然而，开发一种具有高容量、快速动力学和低再生温度的耐用材料，用于 CO 捕获，特别是从复杂和动态的大气中捕获 CO，仍然是一个挑战。在此，合成了一种具有烯烃键的多孔、结晶共价有机骨架（COF），并通过共价键合胺引发剂对其进行后合成修饰，在孔内生成聚胺。这种 COF（称为 COF-999）可以从开放空气中捕获 CO。在干燥条件下，COF-999 的 CO 吸附量为 0.96 mmol g，在 50%相对湿度下，CO 吸附量为 2.05 mmol g，均来自 400 ppm CO。该 COF 在加利福尼亚州伯克利的开放空气中进行了超过 100 次的吸附-解吸循环测试，发现其性能完全保持。COF-999 是一种从开放空气中捕获 CO 的优异材料，其循环稳定性、CO 的易吸收性（在 18.8 分钟内达到半容量）和低再生温度（60°C）证明了这一点。
