Metal–organic frameworks (MOFs) are found to be promising porous crystalline materials for application in gas separation. Considering that mixed matrix membranes usually increase the gas separation performance of a polymer by increasing selectivity, permeability, or both (i.e., perm-selectivity), the zeolitic imidazole framework-95 (ZIF-95) MOF was dispersed for the first time in polysulfone (PSF) polymer to form mixed matrix membranes (MMMs), namely, ZIF-95/PSF. The fabricated ZIF-95/PSF membranes were examined for the separation of various gases. The characterization of solvothermally synthesized ZIF-95 was carried out using different analyses such as powder X-ray diffraction (PXRD), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), porosity measurements, etc. ZIF-95 was mixed with PSF at 8%, 16%, 24%, and 32% weight percent to form different loading MMMs. SEM analysis of membranes revealed good compatibility/adhesion between the MOF and polymer. The permeability of He, H2, O2, CO2, N2, and CH4 were measured for the pure and composite membranes. The ideal selectivity of different gas pairs were calculated and compared with reported mixed matrix membranes. The maximum increases in permeabilities were observed in 32% loaded membrane; nevertheless, these performance/permeability increases were at the expense of a slight decrease of selectivity. In the optimally loaded membrane (i.e., 24 wt% loaded membrane), the permeability of H2, O2, and CO2 increased by 80.2%, 78.0%, and 67.2%, respectively, as compared to the pure membrane. Moreover, the selectivity of H2/CH4, O2/N2, and H2/CO2 gas pairs also increased by 16%, 15%, and 8% in the 24% loaded membrane, respectively.

ZIF-95 as a filler for enhanced gas separation performance of polysulfone membrane

Functional modification, self-assembly and application of calix[4]resorcinarenes

The development of new technologies for the efficient degradation of toxic organic pollutants from water resources has received great attention. In this study, we described an effective method for the preparation of Pd nanoparticles (NPs) decorated on nitrogen rich ionic liquid (IL) modified magnetic nanoparticles and its application as the green and recoverable heterogeneous catalyst in the reductive degradation of organic dyes and reduction of nitro compounds. The Fe3O4/SiO2−IL−Pd nanocatalyst was characterized by several techniques namely, FT-IR, FE-SEM, EDX- elemental mapping, XRD, TEM, XPS, TGA and VSM. The Fe3O4/SiO2-IL−Pd nanocatalyst was applied for the efficient reduction of structurally different nitroarenes, methyl orange (MO), methylene blue (MB) and methyl red (MR) in aqueous media using NaBH4 as reducing agent at room temperature. Using this catalyst nitroarenes were reduced to corresponding amines very efficiently and organic dyes reduced quantitatively under short reaction times. The catalyst can be recovered and recycled for at least ten runs without a notable decrease in the activity. 

Pd Nanoparticles Decorated on Ionic Liquid Modified Magnetite Nanoparticles as a Recyclable and Active Nanocatalyst for Reduction of Nitro Compounds and Degradation of Organic Dyes

Two Co(II)-based metal–organic frameworks (MOFs) with open channels, [(CH3)2NH2]2[Co5L(H2O)8]·4H2O (1) and [Co6L(DMF)2(H2O)8]·2H2O (2), were synthesized using resorcin[4]arene ligand (H12L). Compounds 1 and 2 exhibit different 3D microporous framework structures: 1 possesses two kinds of open channels parallel to the a-axis (ca. 5.0 × 5.0 A) and the b-axis (ca. 4.0 × 6.0 A), and 2 is an open framework with a window size of 5.6 × 5.6 A. The activated crystal 1 involves many Lewis acid sites; thus, 1 shows prominent activity and recyclability for the reaction of carbon dioxide coupled with epoxides. Most strikingly, catalyst 1 can be reused for five successive cycles and provides outstanding catalytic activity.

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Two Co(II)-Based MOFs Constructed from Resorcin[4]Arene Ligand: Syntheses, Structures, and Heterogeneous Catalyst for Conversion of CO2

The earth-abundant transition metal dichalcogenides (TMDs) have emerged as an effective catalyst to improve the catalytic performance of heterogeneous catalysis, especially in the organic functional group conversion chemistry. The layered...

1T-MoS2 catalysed reduction of nitroarenes and one-pot synthesis of imines

Metal–organic framework (MOF)-supported metal nanoparticles (NPs) have been proven to be highly efficient in catalytic fields. In this work, palladium NPs were rationally confined in a MOF [CuI4(Si...

Bing-Bing Lu

Papers

Palladium Nanoparticles Immobilized on a Resorcin[4]arene-Based Metal–Organic Framework for Hydrogenation of Nitroarenes

Two Co(II)-Based MOFs Constructed from Resorcin[4]Arene Ligand: Syntheses, Structures, and Heterogeneous Catalyst for Conversion of CO2