Plant-mediated biosynthesis of silver nanoparticles by leaf extracts of Lasienthra africanum and a study of the influence of kinetic parameters

[摘要] Lasienthra africanum (LA) leaf extract was employed for nano-silver synthesis. The reducing effect of the plant extract was investigated at different times, pH, temperatures and concentrations. The effect of variouskinetic parameters was studied using UVâ€�?�vis spectroscopy. Blue-shifted surface plasmon bands indicating smaller sized nanoparticles were obtained at neutral pH (6.8â€�??7.0), temperature of 65$^{circ}$C and concentration ratio of 1:10 (leafextract: AgNO$_3$) with increasing reaction times under the reaction conditions. The kinetics of the reaction followed pseudo-first- and -second-order rate equations, and was thermodynamically favoured at higher time. Sphericallyshaped nanoparticles were obtained at different reaction conditions.

[学科分类] 材料工程

[关键词] Silver nanoparticles;thermodynamics;kinetics;biosynthesis;plasmon bands.