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- Title
Silver Nanoparticles Obtained by Aqueous or Ethanolic Aloe vera Extracts: An Assessment of the Antibacterial Activity and Mercury Removal Capability.
- Authors
Vélez, Ederley; Campillo, Gloria; Morales, Gladis; Hincapié, César; Osorio, Jaime; Arnache, Oscar
- Abstract
Silver nanoparticles (AgNPs) were synthesized by chemical reduction of Ag+ ions (from silver nitrate AgNO3), using aqueous or ethanolic<italic> Aloe vera</italic> extracts as reducing, stabilizing, and size control agent. The nanoparticles’ sizes were between 2 and 7 nm for ethanolic extract and between 3 and 14 nm for aqueous extract, as measured by High-Resolution Transmission Electron Microscope (HRTEM). The antibacterial activity against a mesophilic microorganism,<italic> Kocuria varians</italic>, a Gram-positive coccus, was measured by counting bacterial colonies in agar plate for both extracts. We found that 4% effective concentration is the lowest concentration that completely inhibited visible growth. Mercury removal was investigated by Atomic Absorption Spectroscopy (AAS) measurements, where it was shown that it is not necessary to use high concentrations of nanoparticles for effective removal of mercury inasmuch as with a 20% V/V concentration of both extracts; the Hg(II) removal percentage was above 95%. These results show that the mercury remaining unremoved from the different essays is below the level allowed by World Health Organization (WHO) and the Environmental Protection Agency (EPA).
- Subjects
SILVER nanoparticles; CHEMICAL reduction; ALOE vera; MERCURY removal in flue gases; ATOMIC absorption spectroscopy
- Publication
Journal of Nanomaterials, 2018, p1
- ISSN
1687-4110
- Publication type
Article
- DOI
10.1155/2018/7215210