Journal
APPLIED ORGANOMETALLIC CHEMISTRY
Volume 34, Issue 5, Pages -Publisher
WILEY
DOI: 10.1002/aoc.5597
Keywords
antibacterial; Chlorella ellipsoidea; green alga; photocatalytic; silver nanoparticles
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Funding
- Assam University, Silchar, under the aegis of the University Grants Commission, New Delhi, India
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A facile, convenient and green method has been employed for the synthesis of silver nanoparticles (AgNPs) using dried biomass of a green alga, Chlorella ellipsoidea. The phytochemicals from the alga, as a mild and non-toxic source, are believed to serve as both reducing and stabilizing agents. The formation of silver nanoparticles was confirmed from the appearance of a surface plasmon resonance band at 436 nm and energy dispersive X-ray spectroscopy. The transmission electron microscopy images showed the nanoparticles to be nearly spherical in shape with different sizes. A dynamic light scattering study revealed the average particle size to be 220.8 +/- 31.3 nm. Fourier transform infrared spectroscopy revealed the occurrence of alga-derived phytochemicals attached to the outer surface of biogenically accessed silver nanoparticles. The powder X-ray diffraction study revealed the face-centred cubic crystalline structure of the nanoparticles. The as-synthesized biomatrix-loaded AgNPs exhibited a high photocatalytic activity for the degradation of the hazardous pollutant dyes methylene blue and methyl orange. The catalytic efficiency was sustained even after three reduction cycles. A kinetic study indicated the degradation rates to be pseudo-first order with the degradation rate being 4.72 x 10(-2) min(-1) for methylene blue and 3.24 x 10(-2) min(-1) for methyl orange. The AgNPs also exhibited significant antibacterial activity against four selected pathogenic bacterial strains.
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