| 초록 |
Zr-based MOF (UiO-66) is known as a leading candidate of adsorbents applied for gas separation process due to high surface area, easily tuned porous properties; chemical surface and diversity in synthesis method. In compared to other MOF-type, however, UiO-66 shows CO2 capture capacity modestly. Therefore, UiO-66 material should be modified its characterization to improve CO2 adsorption capacity. In this work, modified UiO-66 was prepared in one step synthesis between ZrCl4 and linker mixed by terephthalic acid and 4-aminobenzoic acid (ABA) systematically. The presence of ABA in reaction system induced missing-linker defects, simultaneously appearance of NH2 groups in framework, causing to improve CO2 capture capacity. The obtained materials were analysed by SEM, XRD, FTIR, XPS and TGA. The adsorption isotherms of CO2 and N2 on as-prepared adsorbents were recored at 298 K. The results showed that UiO-66#10-NH2 showed a CO2 uptake amount of 2.1 mmol/g, which is higher than that of UiO-66 about 45%. Also, the CO2/N2 selectivities based on ideal adsorbed solution theory (IAST) and isosteric heat of adsorption were investigated to evaluate gas separation performance of adsorbents |
