Benign Integration of a Zn-Azolate Metal–Organic Framework onto Textile Fiber for Ammonia Capture

Abstract

Ammonia (NH3) exposure has a serious impact on human health because of its toxic and corrosive nature. Therefore, efficient personal protective equipment (PPE) such as masks is necessary to eliminate and mitigate NH3 exposure risks. Because economically and environmentally viable conditions are of interest for large-scale manufacture of PPE, we herein report a benign procedure to synthesize a Zn-azolate metal–organic framework (MOF), MFU-4, for NH3 capture. The surface area and morphology of MFU-4 obtained in alcohol solvents at room temperature is consistent with that of traditionally synthesized MFU-4 in N,N-dimethylformamide at 140 °C. In addition to its large NH3 uptake capacity at 1 bar (17.7 mmol/g), MFU-4 shows outstanding performance in capturing NH3 at low concentration (10.8 mmol/g at 0.05 bar). Furthermore, the mild synthetic conditions implemented make it facile to immobilize MFU-4 onto cotton textile fiber. Enhanced NH3 capture ability of the MFU-4/fiber composite was also attributed to the well-exposed MOF particles. The benign synthetic MFU-4 procedure, high NH3 uptake, and easy integration onto fiber pave the way toward implementation of similar materials in PPE.

Benign Synthesis and Modification of a Zn–Azolate Metal–Organic Framework for Enhanced Ammonia Uptake and Catalytic Hydrolysis of an Organophosphorus Chemical

“…As depicted in Figure a, the steep NH 3 uptake of MFU-4l occurred at 2.2 mbar. Impressively, after exchanging −Cl with an −OH ligand, the MOF adsorbed NH 3 at a lower pressure, 0.1 bar, comparable to previous work . Note that the PXRD patterns of both MFU-4l and MFU-4l-(OH) revealed a loss in crystallinity after the adsorption and desorption of NH 3 (Figure S10).…”

“…Impressively, after exchanging −Cl with an −OH ligand, the MOF adsorbed NH 3 at a lower pressure, 0.1 bar, comparable to previous work. 42 Note that the PXRD patterns of both MFU-4l and MFU-4l-(OH) revealed a loss in crystallinity after the adsorption and desorption of NH 3 (Figure S10). We attribute the adsorption of NH 3 at lower pressures to the presence of hydroxide anions.…”

Water Confined in MIL-101(Cr): Unique Sorption–Desorption Behaviors Revealed by Diffuse Reflectance Infrared Spectroscopy and Molecular Dynamics Simulation

“…However, the relatively low water uptake and sorption–desorption rate of these two adsorbents indicate that there is still a demand to develop a new energy-saving porous material. Lately, metal–organic frameworks (MOFs) were proposed − and became widely studied as candidates for separation processes, catalytic processes, and gas storage due to their peculiar coordination structures, controllable organic ligands, tailor-made porous morphologies, and large Langmuir surface areas. Herein, chromium terephthalate-based solid with large pore volumes labeled as MIL-101­(Cr) (MIL stands for Materials Institute Lavoisier) is discussed. − MIL-101­(Cr) is unique in terms of hierarchical cages with large diameters of 29 and 34 Å (window aperture of 12 and 16 Å) and corresponding huge pore volumes of 12 700 and 20 600 Å 3 .…”

Weak Coordination Bond of Chloromethane: A Unique Way to Activate Metal Node Within an Unstable Metal–Organic Framework DUT‐34

“…Metal–organic frameworks (MOFs), which are assembled by the continuous link of coordination bonds between inorganic metal ions (or metal‐oxo clusters) and polydentate organic ligands, are a highly crystalline subset of these fascinating porous materials. With their permanent porosity, exceptionally high internal surface area, wide chemical variety, and tunable topology, MOFs have been examined for their potential in applications such as gas uptake, 1–8 molecular separation, 1,2,9–16 drug delivery, 1,17–20 sensing, 21–25 ion transport, 1,2,26–31 electronic conduction, 1,32–38 among others 39–44 …”