In Situ Growth of Cyclodextrin-Based Metal Organic Framework Air Filters for Reusable SO2 Adsorbent Applications

Abstract

In situ growth of cyclodextrin-based metal-organic frameworks (CD-MOFs) is investigated for the effective fabrication of MOF composites through the vapor diffusion method combined with O2 plasma treatment. The growth rate of γ-CD-MOFs on poly(ethylene terephthalate) fibers (CD-MOFs–PET) is determined for 136 h, and the CD-MOFs-PET with 24 h growth time shows the highest surface area without crystal deformation. The specific surface area of the CD-MOFs-PET with 24 h growth time is 142.88 m2 g−1, which is 235 times higher than the pristine PET fibers. The 24 h CD-MOFs-PET shows removal efficiencies higher than 99% for PM0.1 and higher than 95% for SO2 gas. The CD-MOFs-PET demonstrates high recovery of SO2 adsorption ability by the repeated adsorption-desorption cycles, maintaining up to 90% of initial adsorption performance. This study intends to provide an informative discussion of the applicability of textile-based CD-MOFs and the development of reusable filters for the removal of SO2.