| N-(2-hydroxy)-propyl-3-trimethylammonium chloride chitosan (HTCC) with different substitution degrees were prepared by means of quaternization between chitosan and glycidyl trimethyl ammonium chloride (GTMAC) in a homogeneous system. Then a series of HTCC/cellulose acetate (CA)/TiO2hybrid membranes were prepared by blending of two polymers HTCC and CA and using TiO2as the introduced inorganic components. The effect of preparation conditions on mechanical performance were studied such as acetic acid concentration, drying temperature, etc. The morphology and structure of the prepared membranes were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), thermal gravimetric analysis (TGA) and scanning electron microscopy (SEM). Their swelling degree, ion exchange capacity, pure water flux and antibacterial property were tested as well.The results demonstrated that the active amino groups of chitosan were substituted by quaternary ammonium groups partially. As the substitution degree increased, the solubility, pH stability, hygroscopicity and antibacterial property of HTCC enhanced. The optimum preparation conditions of HTCC/CA/TiO2hybrid membrane were as follows:concentration of casting solution2.0wt%, mole ratio of material nCTS:nGTMAC1:1, CA concentration50%, TiO2concentration1.0%, acetic acid concentration70%and drying temperature60℃. In this condition, the HTCC/CA/TiO2hybrid membrane showed good performance:mechanical strength84.29MPa, elongation at break55.12%, swelling degree101.36%and pure water permeability coefficient7.00L/m2-h-MPa. Additionally, the antibacterial assays indicated that the antibacterial ability of tested membranes against E.coli Rosetta, E.coli DH5a and Bacillus subtilis was HTCC/CA/TiO2hybrid membrane> HTCC membrane> CTS membrane, and these membranes showed the greater antibacterial activity against Gram-negative bacteria E.coli than Gram-positive bacteria Bacillus subtilis. |
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