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Binding of the silver nanoparticles to the polymer matrix is revealed through comparison of the FTIR spectra of the cellulose acetate and the Ag\/cellulose acetate membranes. In the later, there is a decrease of the ratio between the bands intensities at 2,000\u20132,500 cm<jats:sup>\u22121<\/jats:sup>. Membrane surface charge of the mixed matrix membranes varies with the pore size and pH, and when compared with cellulose acetate membranes there is a decrease of the negative surface charge densities. The silver nanoparticles in all mixed matrix membranes results in an enhancement of the hydraulic permeabilities, ranging from 10.8 kg m<jats:sup>\u22122<\/jats:sup> h<jats:sup>\u22121<\/jats:sup> bar<jats:sup>\u22121<\/jats:sup> to 67.1 kg m<jats:sup>\u22122<\/jats:sup> h<jats:sup>\u22121<\/jats:sup> bar<jats:sup>\u22121<\/jats:sup>. POLYM. 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