Mechanistic study of the bactericidal action of silver-loaded chabasite on Acidithiobacillus thiooxidans

Antibacterial Activity of Silver‐Loaded “Green Zeolites”

“…Figure 1a presents the XRD patterns of the Green Beta zeolite obtained via seed‐assisted synthesis before and after the ion‐exchange procedure (GBEA and AgGBEA, respectively). Contrary to that reported by Haile et al14 for the ion exchange in the zeolite chabasite, no change was observed in the framework structure of the present Green Beta after ion exchange was performed with silver nitrate. As reported elsewhere,13 the XRD pattern of the Green zeolites are similar to those of the zeolites synthesized with OSDA.…”

“…Here, the obtained Green Beta and Green MTW are denoted as GBEA and GMTW, respectively. Contrary to that reported by Haile et al [14] for the ion exchange in the zeolite chabasite, no change was observed in the framework structure of the present Green Beta after ion exchange was performed with silver nitrate. Zeolites loaded with silver cations (2 wt.-% maximum) were prepared as follows: 50 mg of the zeolites were added to 9.3 g of an aqueous silver nitrate solution (1 mm), and the total volume of the solution was adjusted to 10 mL by adding distilled water.…”

Functional Ag‐Exchanged Zeolites as Biocide Agents

“…Even at low concentrations, silver is one of the strongest biocide agents against a huge range of microorganisms. Furthermore, silver species are considered as very low toxic for humans . Therefore, silver seems to be a possible solution to design new biocide materials.…”

“…have evaluated the biocide effects of silver‐exchanged commercial zeolites (Linde Type A and Faujasite X) against some bacteria ( Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa and Bacillus cereus ), yeast ( Candida albicans and Candida glabrata ) and fungi ( Aspergillus niger and Penicillium vinaceum ) . In addition, the influence of the silver content on the bactericidal effect of some zeolites has been studied,, and even there is a commercial silver‐zeolite named as Zeomic ® ,. However, the fungicidal efficacy of silver‐zeolites has been scarcely studied compared to their bactericidal effect, so far to the best of our knowledge, only the fungicidal effect of the silver‐exchanged Zeolite A, Faujasite X and Mordenite has been studied ,.…”

“…Furthermore, silver species are considered as very low toxic for humans. [9] Therefore, silver seems to be a possible solution to design new biocide materials. However, it is advisable to control the release of silver into the media for reducing costs and environmental concerns without losing treatment effectiveness.…”