Rapid synthesis of mono/bimetallic (Zn/Co/Zn–Co) zeolitic imidazolate frameworks at room temperature and evolution of their CO₂ uptake capacity

Carbon dioxide (CO₂) emissions from fossil fuels cause air pollution and lead to adverse impact on environment. To achieve low-carbon economy, capturing CO₂ in the environment by methods like physisorption on zeolitic imidazolate frameworks (ZIFs) and other zeolite materials has gained attention due to their pore tunability and adsorption efficiency. Exploring the efficacy of the ZIF in adsorbing CO₂, we report a rapid and convenient protocol for the synthesis of novel hybrid monometallic and bimetallic Zn/Co/Co–Zn-based ZIFs at room temperature, and we evaluate their CO₂ capture capacity. ZIFs with varying Co:Zn ratio were synthesized by altering the content of Co and Zn precursors. The CO₂ uptake capacity of mono/bimetallic Zn–Co ZIFs was studied at 298 K and attains the highest CO₂ uptake of 65.50 cm³/g. This rapid room temperature protocol is highly efficient for the synthesis of mono/bimetallic ZIF-CO₂ adsorbents.