Bactericide Effect of Powder Glasses Submitted to Na⁺/Ag⁺ Ionic Exchange in Ionic Media Containing Different Concentration of AgNO₃

Abstract

This work presents preliminary results of powder glasses with bactericide effect obtained by ionic exchange between sodium ions, present in glass composition, and silver ions, present in the ionic exchange medium. The powder glass was submitted to ionic exchange in ionic medium containing different concentration of silver species. The results showed a bactericide effect dependence on AgNO3 concentration in the ionic medium. Agar Diffusion Test on Escherichia coli bacteria, EDS analyses was applied to the samples; the results showed there is a critical concentration of silver ions incorporated in the powder glass and a limit to bactericide effect. The tests and analyses reveled that 6 wt% of AgNO3 in ionic medium was the critical concentration.

Bactericidal properties of bentonite treated with Ag+ and acid

“…The bentonite samples were reacted with 4 N H 2 SO 4 and 8 N HCl at 90°C under agitation for 2 h. The samples were then removed and dried for 24 h at 55°C and reacted with molten AgNO 3 (Fiori et al, 2008a).…”