Abstract
In this paper, the research about the formation and growth of nano- and micro- particles of silver from a silver-modified natural zeolite (Ag-zeolite) by pulsed dielectric barrier discharges (PDBD) is presented. The antibacterial activity of the silver obtained was also considered. Ag-zeolite was exposed to plasma generated by PDBD in distilled water, obtaining a broad range of Ag particles at pressure and room temperature, without using additives, chemical reducing agents or stabilizers. The relationship between the Ag particle size and the contact time with the plasma shows that: (a) at short exposure periods with the plasma are enough to get nanoparticles, and (b) at longer time exposure, microparticles were formed with a regular space distribution over the Ag-zeolite. The particle size was estimated by scanning electron microscopy and the silver identified through X-ray diffractometry, energy-dispersive X-ray spectroscopy, and X-ray photoelectron spectroscopy. The antibacterial activity of the modified Ag-zeolite was determined qualitatively against Escherichia coli based on the zone of inhibition produced.
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