Enhancement of Hydrothermal Stability and CO₂ Adsorption of Mg-MOF-74/MCF Composites

Abstract

Hierarchical porous composite Mg-MOF-74/MCFs were successfully synthesized using a simple and facile method under in situ solvothermal conditions. Textural structures and morphologies of the composites were characterized by X-ray diffraction (XRD), N2 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, CO2 adsorption properties of the composites were tested in a fixed bed with/without hydrothermal treatment. The total CO2 adsorption capacities were calculated by breakthrough curves. The CO2 adsorption capacity of the composites reaches 1.68 mmol/g, which is smaller than that of pristine Mg-MOF-74. However, the total CO2 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 CO2 adsorption performance of the composites were improved compared with those of pristine Mg-MOF-74 after hydrothermal treatment.

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“…Mg-MOF-74 is improved in the future, [183][184][185] it will become a very effective MOF material and find a wide range of applications.…”

A palladium(0)–threonine complex immobilized on the surface of magnetic mesocellular foam: an efficient, stable, and magnetically separable nanocatalyst for Suzuki, Stille, and Heck cross-coupling reactions

“…Their structure has large spherical cell pores (20-42 nm) interconnected with small cylindrical window pores (8-22 nm) to form a continuous three-dimensional (3D) porous structure. 32,33 Because MCF silica nanostructure has a high surface area (500-1000 m 2 g −1 ), large pore size, and large pore volume, a large number of active sites can be created on the inner walls of mesocellular foam channels by surface modication. Thus, MCF silica material is an appropriate candidate for use as support for catalysts, as drug delivery carriers, and as the stationary phase in chromatography.…”

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