Browsing by Author "De silva, C.R."

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    Synthesis of Annona glabra Mediated Silver Nanoparticles, their Photocatalysis and Toxicity on Daphnia magna
    (Asian Journal of Chemistry, 2023) Wickramarachchi, S.R.; Paragodaarachchi, Y.L.; De silva, C.R.; Perera, A.D.L.C.; Amarasinghe5, I.D.
    This work reports the synthesis of silver nanoparticles (AgNPs) using the leaf extract of Annona glabra as a green synthetic route and assessment of its photocatalytic property using methelyne blue as a model dye and toxic effect against an aquatic model, Daphnia magna. Leaf extract prepared at 100 oC, 1% plant extract, 1 mM of AgNO3, 3 h incubation time were optimized for the synthesis of AgNPs. Surface plasmon resonance peak of AgNPs laid around 419 nm. Spherical nanoparticles were in the size ranges 50-80 and 110-195 nm. Biomolecules were present as capping agents on AgNPs. AgNPs have cubic face centered lattice structure and the average particle size as calculated using Debye-Scherrer formula is 55 nm. Green synthesized AgNPs reduced the absorbance of methelyne blue dye by 89% in 3 h showing prominent photocatalytic activity. The EC50 of AgNPs was found to be 1.78 ± 0.20 mg/L against Daphnia magna showing a lower toxicity than silver ions.