Properties of Bactericidal Adsorbents Prepared from Georgian Natural Analcime and Phillipsite

摘要

Zeolite adsorbents and ion exchangers containing bioactive metals and endowed with bactericidal properties are promising materials for water treatment and other environmental and medical applications. Phillipsite, analcime, and synthetic zeolite A have a high ion exchange capacity and can be used to produce such materials. On their basis the silver-, copper-, and zinc-containing microporous materials have been prepared using ion-exchange reactions between zeolite microcrystals and a salt of the corresponding transition metal in the solid phase followed by washing with distilled water. Synthesized in such way adsorbent-ion-exchangers are characterized by chemical analysis, powder X-ray diffraction patterns, and Fourier transform infra-red spectra. Obtained materials preserve the zeolite crystal structure, modified phillipsites contain up to 230 mg/g of silver, 66 mg/g of copper, and 86 mg/g of zinc, modified analcimes contain up to 180 mg/g of silver, 50 mg/g of copper, and 62 mg/g of zinc, modified synthetic zeolites contain up to 290 mg/g of silver, 75 mg/g of copper, and 100 mg/g of zinc. Prepared silver-, copper-, and zinc-containing materials show bacteriostatic action against Escherichia coli regardless of whether the number of released ions of the bioactive metal reaches the minimum inhibitory concentration in solution. The most active is a silver-containing synthetic zeolite, but from a practical point of view, the most promising materials for applications are modified phillipsites.