A mussel-inspired coating for cost-effective and environmentally friendly CO2 capture

Nowadays, finding innovative technologies to efficiently adsorb/desorb CO2 over several cycles with low energy consumption is a pressing environmental concern. In this work, a new bioionspired coating based on the copolymerization of benzene-1,2-diol and hexamethylenediamine, with a CO2 uptake of 7.28 mmol/g under humidified conditions with an outstanding chemical stability and regenerability process is reported. Further functionalization with glycidyltrimethylammonium chloride increases the uptake capacity up to 9.96 mmol/g while lowering the desorption temperature down to 50 degrees C for 20 min. Moreover, the coating shows strong adhesion on cotton and paper, without modifying their intrinsic permeability and mechanical properties, allowing for the recycling of fully available and environmentally friendly biomass. These results demonstrate the competitive advantages of this bioinspired coating compared with current technologies to capture CO2 while accomplishing the resource efficiency of bioeconomy policies.