DECORATION OF COTTON FABRICS WITH METAL-ORGANIC FRAMEWORKS AND THEIR USE TOWARDS FUNCTIONALIZED MICROPOLLUTANT FILTERS
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This dissertation explores the functionalization of woven cotton fabrics by solvothermal synthesis with two different metal-organic framework (MOF) systems, a zeolite-like (ZIF-8) MOF and Zirconium-based MOF (UiO-66, isostructural UiO-66- NH2, and isoreticular UiO-66-NDC and UiO-67). The use of these functionalized fabrics as adsorbents for micropollutants and as potential photocatalysts is also presented. The micropollutants selected cover inorganic as well as organic substances. In the first part of this thesis, the synthesis pathways for ZIF-8 decorated cotton involve seeding and growth of zinc oxide (ZnO) onto the fabric and the subsequent modification of ZnO to ZIF-8 using a one-step synthesis method. The result of our approach was a core-shell structure, ZnO as a core and ZIF-8 as a sheath, conformally deposited on the surface of the cotton fiber. Nitrogen adsorption onto ZIF-8 fabrics allowed to calculate a ZIF-8 content of 5% w/w. Arsenate (As (V)) uptake at pH 7 was investigated and the ZIF-8 fabrics demonstrated a higher uptake (70%) than the ZnO fabrics (38% uptake). Additionally, Zinc loss from the fabric into solution was lowered in the case of ZIF-8 decorated cotton. The growth of UiO-66 onto the cotton fabric is presented in the third chapter. UiO-66 crystals grew in a uniform and conformal manner over the surface of the cotton fibers forming a layer of approximately 50 _m around the cellulose 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. In the fourth chapter, cellulose functionalization was expanded to the isostructural MOF UiO-66-NH2 as well as to isoreticular MOFs UiO-67 and UiO-66- NDC using adapted solvothermal synthesis conditions. A thorough characterization of the MOFs is first presented, and a deeper dive into fundamental understanding of the functionalization is presented. Finally, the conclusion summarizes the findings, explores the next steps with supported proof of concept presented in Appendix 1 through 3, and concludes the research presented in this thesis.
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Umbach, Christopher Cutler