Enhanced CO<sub>2</sub> Capture and Utilization through\nChemically and Physically Dual-Modified Amino Cellulose Aerogels Integrated\nwith Microalgae-Immobilized Hydrogels

This study introduces a novel method\nfor CO<sub>2</sub> capture\nand utilization by integrating chemically and physically dual-modified\namino cellulose aerogels with microalgae-immobilized silk fibroin/sodium\nalginate (SF/SA) composite hydrogels. The modified cellulose aerogels,\nenhanced with 3-(2-aminoethylamino)propyl-dimethoxymethylsilane (AEAPMDS)\nand fumed silica-polyethyleneimine (SiO<sub>2</sub>@PEI), exhibited\nsignificantly improved CO<sub>2</sub> adsorption capacity, mechanical\nstrength, and thermal stability compared to microcrystalline cellulose\n(MCC) aerogels. This modification addresses the limitations of traditional\nphysical and chemical adsorption methods. The captured CO<sub>2</sub> was effectively utilized by the microalgae embedded in the SF/SA\nhydrogel, leading to increased growth rates, improved carbon fixation\nefficiency, and reduced energy consumption during CO<sub>2</sub> capture\nand storage. Temperature regulation was applied to optimize CO<sub>2</sub> adsorption and desorption, demonstrating the system’s\npotential for air quality improvement and sustainable bioengineering\napplications, providing a new strategy to combat climate change.