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 CO2 emissions significantly stimulated the research of low-cost, efficient, and recyclable solid adsorbents of CO2 capture. Metal-organic frameworks (MOFs) are a promising porous material for CO2 adsorption. Hybrid materials consisting in copper benzene-1,3,5-tricarboxylate (Cu-BTC) and Cu doped graphitic-carbon nitride (Cu-g-C3N4) were prepared through solvothermal method as CO2 adsorbent. The size range of Cu-BTC@1.8%Cu-g-C3N4 was 9.0 similar to 19.4 mu m, which was lower than the size range of Cu-BTC (14.6 similar to 29.6 mu m). The hybrid adsorbents had lower Brunauer-Emmett-Teller (BET) surface areas and pole volume due to the combination with Cu-g-C3N4. The CO2 adsorption capacity of Cu-BTC@1.8%Cu-g-C3N4 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-C3N4 had good stability in CO2 adsorption capacity after multiple adsorption cycles.