The reporter learned from Tianjin University on the 21st that the team of professor Wang Zhi of the School of Chemical Engineering and its collaborators achieved the first ultra-thin and large-area preparation of porous material membranes in the world, which makes it easier to separate and capture carbon dioxide A study not only helps to mitigate greenhouse gas emissions, but also opens up a whole new field for gas separation technology. In the afternoon of November 19th, London time, the research results were published online in Nature.

According to reports, the separation and capture of carbon dioxide is of great significance for mitigating greenhouse gas emissions in industrial production. However, in terms of carbon capture, the currently effective “MOFs” materials in gas separation are not ideal. In industrial production, especially in the power industry, the emitted gas often contains a large amount of water vapor. However, the structure of "MOFs" is easily destroyed under humid conditions. Moreover, in the process of preparing the separation filter membrane, the "MOFs" material needs to be mixed with another polymer and then coated on the polymer-based membrane to form a "mixed phase" film. However, because there is no chemical bridging effect between the "MOFs" and the polymers in the film, the actual filter film will have defects such as cracks and unevenness, which will affect the actual performance.

After unremitting efforts, the team of Professor Wang Zhi successfully constructed metal-induced ordered microporous polymers (MMPs) with ordered microporous structure for the first time for the efficient separation of carbon dioxide and nitrogen. The structure uses copper or zinc metal ions, organic coupling molecules and short-chain polymer as structural units. "MMPs" can be coated on commercial base films, which not only have the characteristics of "MOFs" pore structure, but also overcome their shortcomings, and have better film formation and better stability. At the same time, this structure can allow carbon dioxide with good affinity to the polymer units therein to pass through; while nitrogen with poor affinity is blocked, thereby achieving gas separation.

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