Abstract
We report on the successful functionalization of cotton fabrics with a water-stable metal–organic framework (MOF), UiO-66, under mild solvothermal conditions (80 °C) and its ability to adsorb and degrade water micropollutants. The functionalized cotton samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), and X-ray photoelectron spectroscopy (XPS). UiO-66 crystals grew in a uniform and conformal manner over the surface of the cotton fibers. The cotton fabrics functionalized with UiO-66 frameworks exhibited an enhanced uptake capacity for methylchlorophenoxypropionic acid (MCPP), a commonly used herbicide. The functionalized fabrics also showed photocatalytic activity, demonstrated by the degradation of acetaminophen, a common pharmaceutical compound, under simulated sunlight irradiation. These results indicate that UiO-66 can be supported on textile substrates for filtration and photocatalytic purposes and that these substrates can find applications in wastewater decontamination and micropollutant degradation.
Highlights
Metal–organic frameworks (MOFs) are highly tunable, porous materials with applications in gas adsorption [1,2,3,4,5,6], separation [7,8,9], catalysis [10,11,12,13], and filtration [14]
Fourier transform infrared spectroscopy (FTIR) (Figure 7) spectra demonstrated the presence of carboxylate and phenyl bonds ascribed to the terephthalic ligands of UiO-66, and the spectra of the powder MOF and cellulose quantitatively agreed with the spectra reported in the literature [17,36]
Cotton fibers were successfully functionalized with UiO-66, a zirconium-based water-stable MOF
Summary
Metal–organic frameworks (MOFs) are highly tunable, porous materials with applications in gas adsorption [1,2,3,4,5,6], separation [7,8,9], catalysis [10,11,12,13], and filtration [14]. The fact that these MOFs are synthesized almost exclusively in powder form may hinder their potential in applications requiring the use of large and mechanically stable, yet flexible surfaces. While the growth of MOFs on metal oxides has been amply reported, only few of these reports have discussed the coordination of the metal in the MOFs to fibers or textiles [21,22,23,24,25,26,27] In one of these few reports, Zhao et al [25] describe a method for the formation of MOF–nanofiber kebabs on Nylon-6 nanofibers using atomic layer deposition (ALD). ALD is a highly effective technique for precision coating, but because it requires the use of sophisticated equipment under controlled vacuum pcroencdisiitoionncso,aittirnegm, bauintsbeexcapuesnesiivt ereaqnudirreastthheer udsieffiocfuslot ptohissctaicleatuedp etoqulaiprgmeesnutrufancdeesr. Standardized cotton fabrics TIC-400 were obtained from Testfabrics, Inc. (West Pittston, PA, USA) and were cut into 2 × 2 cm squares using a laser cutter
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