The energy produced by fossil fuels has greatly promoted the development of industrialization and the improvement of human living standards. Carbon dioxide (CO2) produced during this process is the main cause of global warming. Alkanolamine, as a liquid adsorbent for carbon dioxide capture and separation, is the most mature method in the industry, but it can corrode equipment and endanger the environment and human health. Therefore, it is necessary to find feasible carbon dioxide capture and storage technology (CCS) to reduce carbon emissions, thereby preventing extreme changes in the global climate.
Metal organic framework (MOF) is a three-dimensional network-like porous crystalline material, which is composed of metal ions and organic ligands in an orderly assembly. MOF has many interesting properties due to its unique crystal structure (including ultra-low density, ultra-high surface area, adjustable porosity and functionalized frame structure, etc.). At present, MOF has been successfully used in many fields such as gas fuel storage, selective gas separation, catalysis, sensing, biomedicine, and supercapacitors.
The research team of Li Bangjing, a researcher from the Chengdu Institute of Biology, Chinese Academy of Sciences, and Zhang Sheng, a professor at Sichuan University, reported on an amino-functionalized β-cyclodextrin-MOF material that can be rapidly prepared by ultrasound and used it for carbon dioxide Adsorption and selective gas separation.
The carbon dioxide adsorption capacity of amino-functionalized β-cyclodextrin-MOF material (NH2-β-CD-MOF) can reach 12.3 cm3 / g, which is 10 times the β-CD carbon dioxide adsorption capacity. It is worth noting that NH2-β-CD-MOF has excellent adsorption selectivity CO2 / N2 (947.52) compared to the reported materials. In addition, in practical applications, the ideal MOF adsorption material should still have good adsorption capacity and selectivity in the presence of water. The introduction of amino groups as polar functional groups can not only improve the gas-selective adsorption of MOF, but also found that amino groups can competitively bind foreign water molecules and improve the water stability of NH2-β-CD-MOF. NH2-β-CD-MOF is not only cheap in raw materials, green and non-toxic, but also can be recycled by secondary ultrasonic method. NH2-β-CD-MOF still has a high carbon dioxide adsorption capacity after repeated recycling tests. The first author of this paper is Xu Long, a master student of the Chengdu Institute of Biology. The above results are titled Amino-functionalized β-Cyclodextrin to Construct Green Metal-Organic Framework Material for CO2 Capture and published in the American Chemical Society journal ACS Applied Materials & Interfaces (DOI : 10.1021 / acsami.9b20003).
Schematic diagram of carbon dioxide adsorption by NH2-β-CD-MOF
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