Zhao Hui-Min, Ma Li, Lin Dan, Han Kun-Kun, Chun Yuan, Xu Qin-Hua
Key Laboratory of Mesoscopic Chemistry of the Ministry of Education, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing 210093, China.
J Nanosci Nanotechnol. 2012 Dec;12(12):8955-62. doi: 10.1166/jnn.2012.6699.
Using poly (ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide) triblock copolymer (P123) as template and tetraethyl orthosilicate as silica source, well-ordered cross-linked bimodal mesoporous SBA-15 was easily prepared via an one-pot synthetic strategy, where a pre-self-assembly of P123 with TEOS in strong acidic media was introduced followed by pH-adjusting. The pH-adjusting can effectively change the copolymer micelle size, which directly lead to the formation of the bimodal mesoporous structure at pH range of 6-7.5, with most typical value at pH = 7.5. Meanwhile, these bimodal mesopores are interconnected, which generates a 3D intra-particle porosity with many pore-openings on the surfaces of particles. After modified with tetraethylenepentamine, the as-synthesized bimodal mesoporous SBA-15 exhibited the CO2 adsorption capacities much higher than as-synthesized conventional SBA-15. These bimodal mesoporous SBA-15 materials have great potential application in CO2 capture.
以聚环氧乙烷-聚环氧丙烷-聚环氧乙烷三嵌段共聚物（P123）为模板，正硅酸乙酯为硅源，通过一锅合成策略轻松制备出有序交联的双峰介孔SBA-15。该策略中，先在强酸性介质中使P123与正硅酸乙酯进行预自组装，然后调节pH值。调节pH值可有效改变共聚物胶束尺寸，这直接导致在pH值为6 - 7.5的范围内形成双峰介孔结构，在pH = 7.5时最为典型。同时，这些双峰介孔相互连通，在颗粒表面形成具有许多孔口的三维颗粒内孔隙率。用四乙烯五胺改性后，合成的双峰介孔SBA-15表现出比合成的传统SBA-15更高的CO₂吸附容量。这些双峰介孔SBA-15材料在CO₂捕获方面具有巨大的潜在应用价值。
