In this work, we report a new route to improve the CO adsorption performance of solid amine adsorbents. Platelet mesoporous silicas with abundant surface silanols were prepared by emulsion synthesis followed by simple solvent extraction. These silanol-rich silica particles were then functionalized with branched polyethyleneimine (BPEI) by grafting or impregnation to prepare CO adsorbents. Silanol-rich silicas grafted with BPEI exhibited 70% higher amine density and 47% higher CO adsorption capacity than its calcined counterpart. The adsorbent achieved a maximum CO adsorption efficiency up to 13.82 mmol CO/g-BPEI. Adsorbed species found in the infrared spectra suggested that silanols may contribute to the enhanced CO adsorption efficiency on grafted amines. Silanol-rich silica functionalized with BPEI retained more porosity than its calcined counterparts, which may account for its superior CO adsorption capacity. Silanol-rich silica impregnated with amines achieved the highest CO adsorption efficiency ever reported (5.65 mmol/g, 526.7 mg/g-BPEI). Adsorption kinetic modeling confirmed that silanol-rich adsorbent provides better CO diffusion pathways. These potential benefits of silanol-amine interaction, coupled with platelet mesoporous structure and branched polyamine chains, opens a new pathway to high-performance adsorbents for CO capture.

中文翻译：

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用支链胺改性的富含硅烷醇的血小板二氧化硅可有效捕获 CO 2

在这项工作中，我们报告了一种提高固体胺吸附剂对 CO 吸附性能的新途径。通过乳液合成和简单的溶剂萃取制备了具有丰富表面硅烷醇的血小板介孔二氧化硅。然后通过接枝或浸渍用支化聚乙烯亚胺 (BPEI) 对这些富含硅烷醇的二氧化硅颗粒进行功能化以制备 CO 吸附剂。用 BPEI 接枝的富含硅烷醇的二氧化硅显示出比其煅烧对应物高 70% 的胺密度和高 47% 的 CO 吸附能力。吸附剂实现了最大的 CO 吸附效率，最高可达 13.82 mmol CO/g-BPEI。在红外光谱中发现的吸附物质表明，硅烷醇可能有助于提高接枝胺对 CO 的吸附效率。用 BPEI 功能化的富含硅烷醇的二氧化硅比其煅烧的对应物保留了更多的孔隙率，这可能是其优异的 CO 吸附能力的原因。用胺浸渍的富含硅烷醇的二氧化硅实现了有史以来最高的 CO 吸附效率（5.65 mmol/g，526.7 mg/g-BPEI）。吸附动力学模型证实富含硅烷醇的吸附剂提供了更好的 CO 扩散途径。硅烷醇-胺相互作用的这些潜在好处，再加上片状介孔结构和支链多胺链，为用于 CO 捕获的高性能吸附剂开辟了新途径。吸附动力学模型证实富含硅烷醇的吸附剂提供了更好的 CO 扩散途径。硅烷醇-胺相互作用的这些潜在好处，再加上血小板介孔结构和支链多胺链，为用于 CO 捕获的高性能吸附剂开辟了新途径。吸附动力学模型证实富含硅烷醇的吸附剂提供了更好的 CO 扩散途径。硅烷醇-胺相互作用的这些潜在好处，再加上片状介孔结构和支链多胺链，为用于 CO 捕获的高性能吸附剂开辟了新途径。