Polyethylenimine (PEI) will block the channel of pore when it was impregnated in the porous solid, limiting its practical application in CO₂ adsorption. In this method, a novel polyethyleneimine-crosslinked cellulose (PCC) aerogel sorbent was prepared by the sol-gel process, hydrolysis reaction and crosslinking reaction. The specific surface area of porous PCC aerogel was still retained 234.2 m²/g when the content of nitrogen was 17.4 wt%. The CO₂ adsorption capacity of PCC aerogel reached 2.31 mmol/g at 25 ℃ under pure dry CO₂ atmosphere. Pseudo-second order model perfectly is suitable to predict the CO₂ adsorption behaviors of PCC aerogel at different temperatures. The CO₂ diffusion mechanism of PCC aerogel was limited by not only intra-particle diffusion but also surface diffusion. The PCC aerogel showed excellent CO₂ adsorption-desorption recyclability after 10 cycles. This work proved that the PCC aerogel played an important role as a potential CO₂ adsorption solids.

聚乙烯亚胺（PEI）浸渍在多孔固体中时会阻塞孔道，从而限制了其在CO ₂吸附中的实际应用。该方法通过溶胶-凝胶法，水解反应和交联反应制备了新型的聚乙烯亚胺交联纤维素（PCC）气凝胶吸附剂。当氮含量为17.4重量％时，多孔PCC气凝胶的比表面积仍保持为234.2m ² / g。在纯干CO ₂气氛下，PCC气凝胶在25℃下的CO ₂吸附容量达到2.31 mmol / g 。伪二级模型非常适合预测PCC气凝胶在不同温度下的CO ₂吸附行为。一氧化碳₂PCC气凝胶的扩散机理不仅受到颗粒内扩散的限制，还受到表面扩散的限制。10次​​循环后，PCC气凝胶显示出优异的CO ₂吸附-解吸再循环性。这项工作证明了PCC气凝胶作为潜在的CO ₂吸附固体起着重要的作用。