The Preparation of Porous Sol-Gel Silica with Metal Organic Framework MIL-101(Cr) by Microwave-Assisted Hydrothermal Method for Adsorption Chillers

Abstract

Metal organic framework (MOF) of MIL-101(Cr)-Silica (SiO2) composites with highly mesoporous and uniform dispersions were synthesized by a microwave-assisted hydrothermal method followed by the sol-gel technique. Water vapor adsorption experiments were conducted on the MIL-101(Cr)-SiO2 composites for industrial adsorption chiller applications. The effects of MIL-101(Cr)-SiO2 mixing ratios (ranging from 0% to 52%), the surface area and amount of Lewis and Brønsted sites were comprehensively determined through water vapor adsorption experiments and the adsorption mechanism is also explained. The BET and Langmuir results indicate that the adsorption isotherms associated with the various MIL-101(Cr)-SiO2 ratios demonstrated Type I and IV adsorption behavior, due to the mesoporous structure of the MIL-101(Cr)-SiO2. It was observed that the increase in the amount of Lewis and Brønsted sites on the MIL-101(Cr)-SiO2 composites significantly improves the water vapor adsorption efficiency, for greater stability during the water vapor adsorption experiments.

Optimization of Chitosan - MIL-101(Fe) - Polyethyleneimine MOF-Based Composite Beads for Methyl Orange Removal

“…A peak at 1681.7 cm -1 is assigned to the carboxyl group C=O in the organic linker. These are all consistent with previous results which confirms that MIL-101(Fe) was successfully synthesized [8,14].…”

Enhanced moisture sorption through regulated MIL-101(Cr) synthesis and its integration onto heat exchangers

“…3f. 54,79 The green solids isolated from reaction mixtures containing 1.25% TEAOH solutions were also characterised through Field Emission Scanning Electron Microscopy (FESEM) (Fig. 4) and Transmission Electron Microscopy (TEM) (Fig.…”

Functional Metal Organic Framework/SiO2 Nanocomposites: From Versatile Synthesis to Advanced Applications

“…Silica can be used to enhance the water stability of MOFs, and their composites can be used to adsorb water or other moist gases. Using a microwave-assisted sol-gel process, Uma et al fabricated an MIL-101(Cr)-SiO 2 composite with uniform mesopores; they found that the material has high adsorption efficiency to water vapor, and the water stability of the composite is significantly enhanced by the addition of silica [68]. Mazaj et al first prepared amino-functionalized MOFs by modifying FDU-12 with aminopropyltriethoxysilane; then, the MOFs were immersed into a Cu 2+ solution to obtain an HKUST-1@NH 2 -FDU-12 composite material with copper ions as ligands (Figure 8) [112].…”