Abstract
Among the most studied adsorbents for CO2 capture is amine-grafted mesoporous silica SBA-15. In this work, boron, a heteroatom, was incorporated into the SBA-15 framework and removed by acid treatment to increase the amount of surface hydroxyl groups. It was discovered that the removal of boron resulted in the formation of silanol nests, with four silanol groups in each nest. Compared with the common method of air calcination for SBA-15, acid-treated boron doped SBA-15, exhibited higher silanol density, as well as higher amine loading after amine grafting. This work is the first to study the use of the silanol nests to graft amines and interact with CO2 directly; the results show more than doubling of the CO2 adsorption capacity for direct air capture.
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