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

[Display omitted] • An innovative bioinspired CO 2 sorbent was synthesized by pyrocatechol and HMDA; • Outstanding CO 2 capture of 7.28 mmol/g was achieved under 4% humidified CO 2 at RT; • Easy functionalization for higher CO 2 capture and lower energy penalty regeneration. • Mussel-inspired coatings were completely stable over 50 adsorption/desorption cycles; • Our coating approach can be potentially applied to a plethora of surfaces. Nowadays, finding innovative technologies to efficiently adsorb/desorb CO 2 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 CO 2 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 °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 CO 2 while accomplishing the resource efficiency of bioeconomy policies. [ABSTRACT FROM AUTHOR]