Silver nanoparticle synthesis using lignin as reducing and capping agents: A kinetic and mechanistic study

Published Date
January 2016, Vol.82:856–862, doi:10.1016/j.ijbiomac.2015.09.066

Title 
Silver nanoparticle synthesis using lignin as reducing and capping agents: A kinetic and mechanistic study

Author

Sixiao Hu

You-Lo Hsieh

Abstract

Silver nanoparticles (AgNPs) were robustly synthesized from aqueous AgNO₃ with alkali lignin (low sulfonate) (AL_ls) severing as dual reducing and capping agent. The AgNP synthesis mechanisms were highly pH dependent. Under neutral and acidic conditions, polydispersed AgNPs were synthesized via the self-catalyzed reduction of Ag⁺ on instantaneously formed Ag₂O surfaces followed by the slower pseudo-first order reduction. The Ag₂O nanoparticles functioned as the nucleating sites for the reduction of remaining silver cations to form AgNPs whose size and size distribution strongly dependent of lignin concentrations. AgNPs were optimally synthesized by reducing 2 mmol/L AgNO₃ with 0.16 wt% AL_ls at pH 10 and 85 °C in 30 min to near 100% yield in bimodal distributed sizes with 23% and 77% in feret diameters of 7.3 (±2.2) nm and 14.3 (±1.8) nm, respectively.

Keywords

Kinetics

Mechanism

Nanoparticle synthesis

Lignin

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