Scalable Biomass-Derived Hydrogels for Sustainable Carbon Dioxide Capture

Carbon capture and sequestration are promising emissionsmitigationtechnologies to counteract ongoing climate change. The aqueous aminescrubbing process is industrially mature but suffers from low energyefficiency and inferior stability. Solid sorbent-based carbon capturesystems present a potentially advantageous alternative. However, practicalimplementation remains challenging due to limited CO2 uptakeat dilute concentrations and difficulty in regeneration. Here, wedevelop sustainable carbon-capture hydrogels (SCCH) with an excellentCO(2) uptake of 3.6 mmol g(-1) (400 ppm)at room temperature. The biomass gel network consists of konjac glucomannanand hydroxypropyl cellulose, facilitating hierarchically porous structuresfor active CO2 transport and capture. Precaptured moisturesignificantly enhances CO2 binding by forming water molecule-stabilizedzwitterions to improve the amine utilization efficiency. The thermoresponsiveSCCH exhibits a notable advantage of low regeneration temperatureat 60 & DEG;C, enabling solar-powered regeneration and highlightingthe potential for sustainable carbon capture to meet global decarbonizationtargets.