Jul 17, · Various MOF materials were synthesized, and Mn (BTC) MOF was found to exhibit the best Zn 2+ -storage ability with a capacity of mAh g −1. Zn 2+ storage mechanism of the Mn (BTC) was carefully studied. Besides, ZIF-8@Zn anodes were prepared by coating ZIF-8 MOF material on Zn Cited by: 1. Typical SEM Image of ACS Material Cu-BTC MOF (HKUST-1) XRD Analysis of ACS Material Cu-BTC MOF (HKUST-1) N 2 Adsorption Isotherms Analysis of ACS Material Cu-BTC MOF (HKUST-1) 3. Application Fields. 1) Selective gas adsorption. 2) Catalysts. 3) Gas adsorption separation and storage. 4) Optical, electrical and magnetic materials. In the present paper, a porous octahedral (ZnO/CuO) composite is synthesized from zinc/copper-based metal-organic framework, and its applications in visible-light-driven photocatalytic degradation of dyes are demonstrated. The precursors of Zn-BTC, Cu-BTC, and Zn/Cu-BTC (BTC: benzene-1,3,5-tricarboxylate) were synthesized using a microwave-assisted method.
Zinc btc mofHigh-Performance Aqueous Zinc-Ion Batteries Realized by MOF Materials | SpringerLink
MOFs are synthesized using solvothermal reactions, which combine the constituent metal and organic ligands using organic solvents such as dimethylformamide DMF and diethyl formamide DEF , and can be designed from various combinations of metal ions and organic ligands.
The topological framework and pore size of the MOFs depend on the metal ions and organic ligands used. More importantly, MOFs have high surface areas and permanent porosity, both of which are attractive for use in H 2 storage systems. The pore size and framework topology have been tuned to obtain high-surface-area materials that effectively improve the H 2 adsorption properties.
Although a wide range of MOFs have been tested for H 2 adsorption, and some showed promising storage capacities in the cryogenic state, their capacities are insignificant at ambient pressure and temperature.
This creates potential active sites for hydrogen adsorption. Cu-BTC has been exceptionally well recognized for its high selectivity in gas storage, especially when the axial aqua ligands are detach via activation.
The reason for high heat adsorption The merits of the synthesized materials were thoroughly characterized using different techniques. In addition, hydrogen adsorption isotherms were measured to determine the uptake capacities.
Therefore, each Cu atoms satisfy its coordination geometry, showing an octahedral geometry with aqua ligands in axial positions. The BTC provides a motif with threefold symmetry, and the tetracarboxylic unit provides a fourfold symmetry, which leads to a 3D motif with six vertices and four trimesate ions that tetrahedrally make up four of the eight triangular faces of the octahedron.
The porosity of these phases displays the absence of any metal ions in the pores. However, the crystallinity of the sample retained after the exchange, the change in the intensities of the peaks, and expected peak shifts after exchange may be due to the alteration of crystal lattice during the exchange process.
A slight disorder of the lattice and existence of the new cation after metal exchange creates a noticeable peak shift from as-synthesized Cu-BTC. This difference in replacement ratio can be explained by the fact that replacement of metal ions is strongly dependent on the solubility of metal nitrates, reactivity, ionic radius of metal ion, and the pH of the reaction mixture.
The SEM analysis also excludes the probability of contamination or growth of another phase during the metal exchange. The SEM images also display homogeneous nanocrystallites without the existence of any other morphology. The distribution of metal ions was assessed by EDS analysis. This clearly proves the existence of exchanged metals in the microcrystalline sample. This result may be due to the fact that it has the highest surface area and pore volume Table 1.
The lattice disorder created due to the incorporation of the new metal cations may diversify the stability of the MM-MOFs. A steep curvature of the adsorption isotherm was observed at the low-pressure region after which the isotherm reached a plateau, indicating that equilibrium was reached and the adsorption is limited to the completion of a single monolayer.
This shape is classified as Type-I according to the IUPAC 31 and usually observed in microporous materials with pore size not much larger than the adsorbate size. The high gas uptake indicates that activation and degassing were able to remove the guest molecules from the pores. This issue may due to incomplete activation 21 or the degradation in textural properties after the metal exchange.
The loss in surface area may be due to the collapsed pores after exchange of metal ions 12 or the adsorption of metal ions on the surface and within the pores. The higher loading intensifies the degradation or collapsing of pores compared to the lower loading. As expected, considerable amounts of hydrogen were adsorbed on the synthesized material because of their large porosities.
The adsorption isotherm of hydrogen on Co-Cu-BTC also reached saturation, however, with a higher adsorption capacity of 1. The improvement of gravimetric uptake in MM-MOFs is probably due to the increase in the binding enthalpy of H 2 with the unsaturated metal sites after the partial exchange.
The binding enthalpy increases due to the higher charge density of the metal ions, and the unsaturated metal sites strongly polarize H 2 , which provides the primary binding sites for H 2 inside the pores of Cu-BTC and subsequently enhances the gravimetric uptake of the materials.
All reagents were used as purchased without further purification. The samples were ground right before TGA experiments to minimize exposure to moisture. Cu-BTC was synthesized as reported earlier. Many portions of as-synthesized Cu-BTC crystals were soaked in 0. At the end of soaking, solutions of metal ions were decanted, and the transmetalated crystals of M-Cu-BTC were harvested by filtration. The surface area was calculated using the built-in functions of ASiQwin 5.
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