One-pot eco-friendly synthesis of gold nanoparticles by glycerol in alkaline medium: Role of synthesis parameters on the nanoparticles characteristics

• Environmentally friendly synthesis of Au nanoparticles.
• Production of anisotropic Au nanoparticles strongly dependent on pH.
• Rate of nanoparticle formation slightly more dependent on gold ions than on glycerol.

In this work we studied the role of experimental variables in an ecologically-correct synthesis of gold nanoparticles carried out by glycerol in alkaline medium at ordinary temperatures (25 °C and 0 °C). Variation of pH allowed the production of spherical and anisotropic nanoparticles. Different concentrations of polyvinylpyrrolidone (PVP) directly impacted the size and stability of the nanoparticles. In contrast, glycerol concentration had little influence on the synthetic process. The empirical rate law was determined for the process with respect to glycerol and gold ions. From the kinetic study it was possible to establish that the rate of nanoparticle formation is only slightly more dependent on gold ions than on glycerol. Thus, to increase the rate of nanoparticles formation, it is economically and environmentally more advantageous to increase the glycerol concentration than the Au3+ concentration.

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