In this paper, the dynamics of the release of silver and copper ions into water from bactericidal cotton fabrics (CF), modified by Ag NPs and bimetallic Ag/Cu particles (BMNPs) and physico-chemical properties of materials are studied. To determine the amount of released ions from the tissue surface modified by NPs, the samples of Ag-CF and Ag/Cu-CF were kept in water for 24 hours, after which the amount of ions desorbed from tissues was measured. These procedures were repeated every 24 hours for three days. The largest amount of ions (46%) was desorbed from the sample Ag-CF during first cycle, then 7, 7% after 2nd and 0, 7% after 3rd cycles. In case of Ag/Cu-CF, for 3 contact cycles of samples with an aqueous medium, 13%, 1% and 0.1% ions of silver in washout water respectively were obtained. Wherein 17% Cu2+ are released in first cycle, in the subsequent washout cycles, copper ions in water were not detected. The obtained results explain the high bactericidal activity of modified cotton textiles precisely in the first day of their use against a number of bacteria due to the active diffusion of both silver and copper ions that are formed on NPs’ surfaces when in contact with the humid environment. The textiles were investigated by UV-visible spectroscopy methods to determine the SPR position of NPs, the amount of metal on the fabric was determined by the flame atomic-absorption spectroscopy (FAAS) method, the correlation between the electrical conductivity of the tissues after each cycle of washing and the amount of NPs remaining after washing was investigated by measures of electrical resistance of the tissue. Comparison of biocide action of Ag NPs and BMNPs in the structure of tissues is studied. We study the effect of Ag-CF and Ag/Cu-CF on bacteria Escherichia coli, Klebsiella pneumoniae, Enterobacter aerogenes, Proteus mirabilis, Pseudomonas aeruginosa, and Staphylococcus aureus.
