Next Generation of Solid Amine Sorbent for Scalable Direct Air Capture

The development of direct air capture (DAC) faces significant challenges due to the lack of efficient sorbents and processes. Here we have developed a simple method to synthesise novel sorbent, a nitrogen-rich solid amine net with a CO ₂ uptake capacity up to 3.11 mmol g ^− 1 , nearly 3 times higher than conventional SiO ₂  − impregnated sorbents. It also demonstrated remarkable resistance to oxidative degradation under elevated temperatures (85°C), retaining over 75% of its capacity after 7 days of accelerated ageing, compared to a greater than 50% reduction in capture capacity for conventional impregnated sorbents and commercially available resins. The synthesis is green, environmentally friendly, and can be completed within 10 minutes under ambient conditions. This novel sorbent shows promise for large-scale DAC systems by tackling key DAC-associated challenges.