KCS

Halloysite nanotubes, MOF were used as gas adsorbents. It was judged that the complex of halloysite and MOF could significantly increase the gas adsorption capacity, so the synthesis of HNTs, MOF complex was conducted focusing on nitrogen and carbon dioxide adsorption experiments. Gas adsorbents were synthesized with the modified HNTs and MOFs, HKUST-1, the most widely studied MOFs owing to their high porosity. And HNTs were used for surface modification after only purifying. Hybrid composites synthesized by the solvothermal method by loading the MOF precursor into the lumen of the surface-modified HNTs are referred to as EHNT@HKUST-1 and HNT-NH₂@HKUST-1. The gas adsorption capacity was analyzed by Brunauer-Emmett-Teller (BET) using N₂ and CO₂ gases. Specifically, the EHNT@HKUST-1 composite showed enhanced CO₂ gas adsorption capacity compared to HNT@HKSUT-1, being increased about 14.9 times, from 8.344 cm³(STP)g-1 to 19.332 cm³(STP)g-1. Additionally, HNT-NH₂@HKUST-1 indicated around 24.849 cm³(STP)g-1 of CO₂ gas adsorption capacity. Additionally the morphological and structural characteristics were also analyzed by SEM, TEM-EDS, and XRD. Looking at the images, it can be seen that the MOF grows along the inner wall of the tube to match the shape of the longitudinal axis, which is noteworthy data. It is also speculated that by inserting the MOF inside the tube, the moisture vulnerability of the MOF itself could be supplemented.