美国加州大学Yaghi, Omar M.团队报道了利用共价有机框架从露天空气中捕获二氧化碳。相关研究成果发表在2024年10月23日出版的国际学术期刊《自然》。

从空气中捕获二氧化碳为应对气候变化和实现碳中和目标提供了一种有前景的方法。然而，仍然缺乏开发一种高容量、快速动力学和低再生温度的耐用材料来捕获二氧化碳，特别是从复杂和动态的大气中捕获二氧化碳。

该文中，研究人员合成了一种具有烯烃键的多孔晶体共价有机框架（COF），对其结构进行了表征，并通过共价连接胺引发剂进行合成改性，以在孔内生产多胺。这种COF（称为COF-999）可以露天捕获二氧化碳。COF-999在干燥、二氧化碳浓度均为400ppm条件下的容量为0.96m/mol，在50%相对湿度下的容量均为2.05m/mol。

这种COF在加利福尼亚州伯克利的露天环境中进行了100多次吸附-解吸循环测试，发现其性能完全保持不变。COF-999是一种从露天捕获二氧化碳的特殊材料，其循环稳定性、易于吸收二氧化碳（18.8分钟内达到一半容量）和低再生温度（60°C）都证明了这一点。

附：英文原文

Title: Carbon dioxide capture from open air using covalent organic frameworks

Author: Zhou, Zihui, Ma, Tianqiong, Zhang, Heyang, Chheda, Saumil, Li, Haozhe, Wang, Kaiyu, Ehrling, Sebastian, Giovine, Raynald, Li, Chuanshuai, Alawadhi, Ali H., Abduljawad, Marwan M., Alawad, Majed O., Gagliardi, Laura, Sauer, Joachim, Yaghi, Omar M.

Issue&Volume: 2024-10-23

Abstract: Capture of CO2 from the air offers a promising approach to addressing climate change and achieving carbon neutrality goals1,2. However, the development of a durable material with high capacity, fast kinetics and low regeneration temperature for CO2 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 CO2 from open air. COF-999 has a capacity of 0.96mmolg–1 under dry conditions and 2.05mmolg–1 under 50% relative humidity, both from 400ppm CO2. 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 CO2 from open air as evidenced by its cycling stability, facile uptake of CO2 (reaches half capacity in 18.8min) and low regeneration temperature (60°C).

DOI: 10.1038/s41586-024-08080-x

Source: https://www.nature.com/articles/s41586-024-08080-x