We have presented a biological and eco-friendly method
for the
synthesis of gold nanoparticles from gold precursor (HAuCl4) using Sapindus mukorossi Gaertn. fruit pericarp
(soapnut shells). We investigate the production of gold nanoparticles
as a function of the concentration of HAuCl4 and the amount
of soapnut shells. Average nanoparticle sizes of 9, 17, and 19 nm
were obtained by using the HAuCl4 concentrations of 1,
5, and 10 mM, respectively, with a fixed amount of soapnut shells
extract. The resulted gold nanoparticles are highly crystalline face-centered
cubic (fcc) structures. FT–IR analysis suggests that the obtained
gold nanoparticles might be stabilized through the interactions of
carboxylic groups in the saponins and the carbonyl groups in the flavonoids
present in the soapnut shells. These soapnut shells mediated gold
nanoparticles were demonstrated to have good catalytic activity for
the chemical reduction of p-nitroaniline.
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