Metal-organic Frameworks-Chitosan Fibers Composites:Prepartion, Characterization, And Property

Metal-Organic Frameworks (MOFs) onto fibrous substrates is a hot topic in the field of protective garments against mustard (HD) and soman (GD). In this thesis, two series of MOF-modified composites (HKUST-1)n@ chitosan fibers composite (1) and (MOF-5)n@ chitosan fibers composite (2) were fabricated by alternately dipping in mother liquor self-assembled technique. Nano Ag@ (MOF-5)n@ chitosan fibers composite (3) was prepared by irradiating at 350 nm wavelength an aqueous solution of silver nitrate. The prepared composites were characterized by IR, SEM, EDX, ICP and XRD, which showed HKUST-1 and Nano Ag@ MOF-5 were successfully assembled onto the chitosan fibers. Catalytic detoxification and arterial hemostasis performance of composite (1) and (3) were studied. The main achievements obtained are given below.(1) Carboxymethylated chitosan fibers was alternately dipped in copper acetate and 1,3,5-benzenetricarboxylic acid mother liquor to prepare (HKUST-1)n@ chitosan fibers decontaminant (n representative the number of circulating load, n= 2,4,6,8.). Degradation of GD and HD on (HKUST-1)n@ chitosan fibers were studied. The results showed that the degradation rate of GD and HD increased with n growing. The rate constant and half-life of GD and HD were found to be 0.017 min-1, 40.76 min and 0.012 min-1,57.75 min when the value of n was 4. We observed that chitosan has an effective hemostatic potential and the mix of HKUST-1 and chitosan does not interfere with chitosan’s hemostatic capabilities. The artery hemostasis rates of blank chitosan fibers and (HKUST-1)4@ chitosan fibers were approximately 80% and 75%.(2) Carboxymethylated chitosan fibers was alternately dipped in zinc acetate and terephthalic acid mother liquor to prepare (MOF-5)4@ chitosan fibers. Nano Agm@ (MOF-5)4@ chitosan fibers decontaminant composite (m representative the concentration of aqueous solution of silver nitrate, m= 20,40,60,80,100,120 mM.) was prepared by irradiating at 350 nm wavelength an aqueous solution of silver nitrate. Degradation of HD on Nano Agm@ (MOF-5)4@ chitosan fibers were studied. The results showed that the degradation rate of HD increased with m growing. The rate constant and half-life of HD were found to be 0.011 min-1 and 63.0 min when the value of m was 80. We observed that chitosan has an effective hemostatic potential and the mix of Nano Ag@ MOF-5 and chitosan does not interfere with chitosan’s hemostatic capabilities. The artery hemostasis rates of blank chitosan fibers and Nano Ag80@ (MOF-5)4@ chitosan fibers were approximately 80% and 75%.