Synthesis and characterization of silver nanoparticles (AgNPs) from liquid waste of laboratory experiment

• Main Authors: Fahmi, Achmad Gus, Widyaningtyas, Nimas, Martoprawiro, Muhamad Abdulkadir, Saputra, Iwan Syahjoko
• Format: Conference Proceeding
• Language: English
• Subjects: Ammonia; Chemical synthesis; Colloiding; Crystallites; Ion sources; Liquid wastes; Nanoparticles; Particle size; Reagents; Reducing agents; Room temperature; Silver; X-ray diffraction
• ISSN: 0094-243X; 1551-7616
• DOI: 10.1063/5.0208434

Silver nanoparticles (AgNPs) were successfully synthesized using [Ag(NH3)2]+ precursors. Ag+ ion sources were obtained from liquid waste samples of laboratory experiments. NaBH4 was used as the reducing agent of Ag+ ions to Ag0. The process of reducing Ag+ ions to Ag0 was carried out at room temperature. The color change of the solution from clear to brown which indicates that AgNPs colloids have been successfully synthesized using NaBH4. The AgNPs colloids were characterized using UV-Vis spectrophotometer, X-ray diffraction (XRD), Particle size analyzer (PSA), Particle zeta charge (PZC), and Transmission electron microscope (TEM). The UV-Vis spectrum showed the absorption peak of AgNPs colloid at 420 nm wavelength. The XRD analysis showed the crystallinity peak of silver nanoparticles at angle diffraction of (2θ): 38.12°; 44.25°; 66.37°; and 78.56° with a crystallite size average of 85 nm. The PSA and PZC characterization showed the average size distribution of AgNPs colloid was ± 85.56 nm and ± 120.21 nm with an inter- particle charge repulsion of -11 mV. TEM analysis showed the image of AgNPs colloids a spherical shape with an average particle size of 82 nm. Based on the results from the characterization data, it can be concluded that the liquid waste from the laboratory containing the Ag+ ion can be used as a source of ions in the synthesis of silver nanoparticles. Additionally, the formed silver nanoparticles have the potential as antibacterial agents in cosmetic products.