ZIF-8-incorporated Cellulose Air Filter for Carbon Dioxide Capture

Abstract

ZIF-8 (zeolitic imidazolate framework-8) has emerged as a highly promising material for CO2 capture due to its outstanding adsorption capacity and selectivity. In the present study, ZIF-8 and a ZIF-8-based cellulose air filter (ZCAF) were synthesized using a rapid synthesis route and the kraft pulping method, respectively. The synthesized ZIF-8 and ZCAF samples were characterized using X-ray diffraction (XRD) and scanning electron microscopy (SEM). The SEM analysis revealed a rhombic dodecahedron morphology characterized by rough and porous features, while energy-dispersive X-ray (EDX) analysis confirmed the presence of constituent elements. Furthermore, XRD analyses demonstrated that all observed peaks and bands aligned with the crystalline structure present in the prepared samples. The particle size of the synthesized ZIF-8 samples varied based on the synthesis parameters, measuring approximately 99.46 nm, 101.9 nm, and 105.7 nm. To develop a ZIF-8-based air filter for CO2 capture, the ZIF-8 crystals were incorporated into a filter medium. The resulting ZIF-8-based air filter demonstrated significant improvements in CO2 loading compared to the standard MEA (monoethanolamine) reference. The calculated percentage increase in CO2 loading was approximately 41% for ZIF-8 (ZS3) and 22% for ZCAF (ZCAF3) samples respectively, relative to the MEA reference.