Enhanced carbon dioxide absorption capacity of Cu-BTC through the combination of Cu-g-C3N4 at room temperature

The growing concern about the environmental consequences of anthropogenic CO 2 emissions significantly stimulated the research of low-cost, efficient, and recyclable solid adsorbents of CO 2 capture. Metal–organic frameworks (MOFs) are a promising porous material for CO 2 adsorption. Hybrid materials consisting in copper benzene-1,3,5-tricarboxylate (Cu-BTC) and Cu doped graphitic-carbon nitride (Cu-g-C 3 N 4 ) were prepared through solvothermal method as CO 2 adsorbent. The size range of Cu-BTC@1.8%Cu-g-C 3 N 4 was 9.0 ~ 19.4 μm, which was lower than the size range of Cu-BTC (14.6 ~ 29.6 μm). The hybrid adsorbents had lower Brunauer–Emmett–Teller (BET) surface areas and pole volume due to the combination with Cu-g-C 3 N 4 . The CO 2 adsorption capacity of Cu-BTC@1.8%Cu-g-C 3 N 4 increased by 49.5% compared with that of pure Cu-BTC because of more adsorption sites including unsaturated metal centers and N atoms. Moreover, the Cu-BTC@1.8%Cu-g-C 3 N 4 had good stability in CO 2 adsorption capacity after multiple adsorption cycles. Graphical abstract