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"German Applied Chemistry": researchers from Nangong University developed a new adsorbent to capture carbon dioxide

2019-03-21 来源:转载自第三方
As we all know, the earth is accelerating warming, glaciers and frozen soils are gradually melting, sea levels are rising, and increasingly serious climate changes have damaged the balance of natural ecosystems, threatening human food supply and living environment. Recently, we learned from Nanjing University of Technology that the research group Liu Xiaoqin and Sun Linbing developed a smart adsorbent to achieve low energy consumption and controllable capture of carbon dioxide, which is expected to significantly reduce the energy consumption of gas separation in industrial processes.
Early method of collecting carbon dioxide
In the early years, many scientists were committed to capturing carbon dioxide from sources of concentrated emissions, such as power plants, but later realized that this was a global problem, based only on a few industrial enterprises in a few countries. The emission reduction policy has not been able to prevent the rapid increase in the amount of carbon dioxide. Just earlier this year, the Royal Academy of Engineering released a white paper called Greenhouse Gas Removal (Greenhouse Gas Removal), which clearly stated that the only viable large-scale engineering method for capturing carbon dioxide is capture directly from the air. However, air trapping is undoubtedly difficult. The biggest difficulty is that if there is a good carbon dioxide adsorbent, how can it be restored to its original state after releasing carbon dioxide; that is, how to reuse (regenerate) this adsorbent with minimal energy consumption has been a problem that has plagued many scientists for decades.
Controllable capture of carbon dioxide
According to Jiang Yao, the first author of the paper and a doctoral student of Nangong University, in the industrial adsorption separation operation, the traditional adsorbent usually needs to realize its recycling process under the condition of temperature change or pressure transformation. "It is the adsorption at room temperature, desorption at elevated temperature; or adsorption under pressure, desorption after decompression, the disadvantage is that these two methods tend to have higher energy consumption." Jiang Yao said.
“We try to use green energy as a substitute for light energy.” Professor Sun Linbing said that there are some special substances with “light responsiveness” in nature, which can produce structural changes under different wavelengths of light, and exert adsorption, azo. The benzene molecule is one of them.
"We hope to rationally match this photoresponse performance with active materials and synergistically achieve controllable capture of carbon dioxide." Sun Linbing said that based on this idea, the research team first constructed a "photo-responsive" metal-organic framework, then introduces an active site that can adsorb carbon dioxide, and debugs the active site under different light conditions, finally achieving controllable capture of carbon dioxide.
“This synergistic mechanism greatly reduces energy consumption compared to traditional temperature-changing and pressure swing adsorption.” Jiang Yao said that the new adsorbent can be applied to industrial flue gas filled with carbon dioxide in the future to help save energy and reduce emissions.
Edited by Suzhou Yacoo Science Co., Ltd.

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