Open AccessEnhancement of Hydrothermal Stability and CO2 Adsorption of Mg-MOF-74/MCF Composites
Author(s) -
Chunling Xin,
Yang Ren,
Zhaofei Zhang,
Lili Liu,
Xia Wang,
Jinmei Yang
Publication year - 2021
Publication title -
acs omega
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.779
H-Index - 40
ISSN - 2470-1343
DOI - 10.1021/acsomega.1c00098
Subject(s) - thermogravimetric analysis , hydrothermal circulation , adsorption , materials science , microporous material , scanning electron microscope , mesoporous material , composite material , transmission electron microscopy , thermal stability , desorption , chemical engineering , composite number , hydrothermal synthesis , nanotechnology , chemistry , organic chemistry , catalysis , engineering
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), N 2 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 2 adsorption properties of the composites were tested in a fixed bed with/without hydrothermal treatment. The total CO 2 adsorption capacities were calculated by breakthrough curves. The CO 2 adsorption capacity of the composites reaches 1.68 mmol/g, which is smaller than that of pristine Mg-MOF-74. However, the total CO 2 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 2 adsorption performance of the composites were improved compared with those of pristine Mg-MOF-74 after hydrothermal treatment.