Enhancement of Hydrothermal Stability and CO Adsorption of Mg-MOF-74/MCF Composites.

Hierarchical porous composite Mg-MOF-74/MCFs were successfully synthesized using a simple and facile method under solvothermal conditions. Textural structures and morphologies of the composites were characterized by X-ray diffraction (XRD), N adsorption-desorption isotherms, and scanning electron microscopy (SEM), transmission electron microscopy (TEM), and thermogravimetric analysis (TGA). The results demonstrate that a large amount of nanosized Mg-MOF-74 particles is incorporated into the pores of mesocellular siliceous foams (MCFs) without remarkable aggregation and the composites possess microporous and mesoporous characteristics of both components. In addition, CO adsorption properties of the composites were tested in a fixed bed with/without hydrothermal treatment. The total CO adsorption capacities were calculated by breakthrough curves. The CO adsorption capacity of the composites reaches 1.68 mmol/g, which is smaller than that of pristine Mg-MOF-74. However, the total CO adsorption capacity of the composites after hydrothermal treatment reaches 2.66 mmol/g, which is larger than that of Mg-MOF-74 (2.39 mmol/g) under the same condition. XRD patterns and SEM images of the composites demonstrate that the hydrothermal stability and CO adsorption performance of the composites were improved compared with those of pristine Mg-MOF-74 after hydrothermal treatment.