PI.022 Microwave assisted synthesis of silver nanoparticles using starch

Resumo

This study describes a green synthesis method for silver nanoparticles (AgNPs) using microwave irradiation. The method utilized corn starch as a stabilizing agent and silver nitrate (AgNO₃) as a metal precursor, with the pH of the medium optimized for reduction of Ag⁺ ions, being determine that a basic medium is required. UV-Vis spectroscopy was used to characterize the synthesized AgNPs, which were subsequently impregnated into commercial TiO₂ nanoparticles (P25) and tested for the photodegradation of indigo carmine dye. The efficiency of the impregnation process was evaluated using DRS and RBS analyses, revealing a small mass of impregnated Ag and a decrease in the band gap value of the substrate. All samples demonstrated efficacy in the photodegradation of indigo carmine, with the AgNPs-impregnated TiO₂ showing slightly lower activity than the non-impregnated commercial TiO₂.