Abstract
In this work, a novel mixed-component bimetallic metal-organic framework (MOF) composite material was synthesized via a solvothermal approach, and its structural and textural properties were systematically characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), N(2) adsorption/desorption analysis, and transmission electron microscopy (TEM). Furthermore, the single-component adsorption isotherms of CO(2) and N(2) were experimentally measured and fitted to the Langmuir-Freundlich model. The CO(2)/N(2) selectivity of the composite was evaluated based on the ideal adsorption solution theory (IAST). The results demonstrated that the addition of Zn(2+) significantly enhanced the specific surface area and improved the CO(2) adsorption capacity (3.97 mmol/g at 35 °C and 1 bar), with an increase of 31.5% in comparison with the Cu-BTC/MCFs (3.02 mmol/g). Meanwhile, the Zn-Cu-BTC/MCFs had good recyclability and CO(2)/N(2) selectivity up to 12.5 determined via IAST (CO(2):N(2) = 85:15).