Construction of low-energy regenerative bagasse-based carbon capture material for high efficiency CO₂ capture

Using biomass for the production of low-energy regenerative carbon capture materials represents an effective strategy to advance carbon dioxide capture and storage technologies. In this study, a low-energy regenerative bagasse-based CO₂ capture material is synthesized through a one-step, rapid crosslinking strategy. In this method, epichlorohydrin is used to crosslink bagasse with temperature sensitive Pluronic® F-127 and polyethyleneimine, thereby addressing the challenge of simultaneously incorporating multiple functional groups into the biomass matrix. The resulting material with abundant amino adsorption sites demonstrates a high adsorption capacity of 4.52 mmol/g. Interestingly, the temperature-sensitive response of the material facilitates the grafted amine chain segments on bagasse to stretch and shrink reversibly within a narrow temperature range of 25 °C for adsorption and 55 °C for desorption. The shrinkage state is conducive to the CO₂ desorption process, resulting in an ultralow regeneration temperature of 55 °C. Additionally, the water contained in the material enhances its cyclic stability in extreme environments, such as pure CO₂ atmosphere at high temperature. Overall, this research not only provides new ideas for enhancing the long-term stability and economic viability of CO₂ capture materials but also offers feasible solutions for combating climate change and promoting sustainable development.