Ionic Liquid Welding of the UIO-66-NH₂ MOF to Cotton Textiles

Abstract

Ionic liquid based fiber welding has been used to attach the metal−organic framework (MOF) UiO-66-NH 2 to cotton fibers. The results show that by controlling the extent of the welding process, it is possible to produce fibers that contain a high surface area (approximately 50−100 m 2 / g), an X-ray diffraction pattern consistent with UiO-66-NH 2 , and fibers that are chemically reactive to dimethyl 4-nitrophenyl phosphate (DMNP), a common chemical weapon simulant. The ionic liquid/MOF welding solution can be applied by directly placing the fabric in the welding solution or by utilizing an airbrushing technique. Both welding techniques are shown to be scalable with results collected on approximately 1 × 1, 5 × 5, and 15.5 × 15.5 in. swatches. The results are also applicable to weaving methods where the MOF is welded to individual threads and subsequently woven into a textile. The results provide an industrially scalable method of attaching a wide variety of MOFs to cotton textiles, which does not require synthesizing the MOF in the presence of the textile.

Metal Organic Framework Functionalized Textiles as Protective Clothing for the Detection and Detoxification of Chemical Warfare Agents—A Review

“…In addition, Bunge et al 196 demonstrated two more approaches, namely, direct contact welding and air-brush welding to produce multiple batches of UiO-66-NH 2 embedded cotton textiles using ionic liquid (IL)/MOF as a welding solution. The MOF welded cotton textiles were examined against chemical simulant DMNP and the conversion reaction of DMNP to p-nitrophenoxide was recorded using the UV−vis spectrophotometer over a period of time.…”

Green MOF-Fabrics: Benign, Scalable Sorption-Vapor Synthesis of Catalytic Composites to Protect against Phosphorus-Based Toxins

“…Cotton fabric can be especially challenging to coat due to water uptake, fiber variability, and fiber hand changes during processing. However, there are reports of UiO-66 cotton composites predominantly using UiO-66 formed with traditional solvents. − In a different study, cotton fabrics were coated with UiO-66-NH 2 with precursors dissolved in dilute acetic acid combined with HCl and NaOH . To the best of our knowledge, no previous study has explored GVL as a green solvent for MOF-fabric composite synthesis.…”

Porous textile composites (PTCs) for the removal and the decomposition of chemical warfare agents (CWAs) – A review

“…The same approach was also adjusted to inorganic zeolite crystals which can be directly deposited on cellulose fiber via classical methods such as hydrothermal treatment or spray-coating [222,223]. An original approach has been validated recently, using an ionic liquid welding technique to improve the anchoring of UiO-66-NH 2 on cotton [224]. Deposition of pre-formed MOFs by simple immersion of the textile in a suspension have also been reported for the deposit of MOF-808 on cotton [32].…”

“…High degradation efficiencies towards DMNP (i.e. half-lives under 10 min) with UiO-66-NH 2 composites were obtained either using the photothermal effect [244,251,306], some specific synthesis deposition [224,246,247] or by adding an intermediate ALD layer between the fiber and the MOF [253,257,258,304]. The photothermal method converts photon into heat thanks to photothermal agents such as polydopamine (PDA) or graphene.…”