Green Synthesis of Gold Nanoparticles from E-Waste for Colorimetric Detection of Salmonella sp

Authors

  • Azmalaeni Rifkah Ansyarif Universitas Syekh Yusuf Al Makassari Gowa
  • Nur Aeni Universitas Syekh Yusuf Al Makassari Gowa
  • Sri Magfirah HS Universitas Negeri Makassar

Keywords:

electronic waste, gold recovery, ascorbic acid, nanoparticle, colorimetric sensor

Abstract

The rapid increase in electronic waste (e-waste) presents environmental and health risks, while also serving as a secondary source of valuable metals such as gold. This study recovered gold from e-waste and synthesized gold nanoparticles (AuNPs) via a green synthesis approach using ascorbic acid as a natural reducing agent, followed by evaluation of their potential as a colorimetric sensor for Salmonella sp. detection. Gold was extracted through pyrolysis and leaching to obtain HAuCl₄ precursor solution, which was subsequently reduced by ascorbic acid to form AuNPs. Characterization by TEM, PSA, and UV–Vis confirmed successful synthesis: TEM showed predominantly spherical particles of 20–50 nm, PSA indicated an average size of 82.6 nm, and UV–Vis revealed a distinct Surface Plasmon Resonance (SPR) peak at 520–560 nm. Colorimetric assays demonstrated a linear absorbance response to Salmonella sp. concentration, achieving a detection limit (LOD) of 13.33 CFU/mL. These results demonstrate that gold recovered from e-waste can be converted into functional AuNPs through environmentally friendly synthesis with ascorbic acid, providing a promising platform for rapid and sensitive biosensing applications in food safety.

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Published

2025-12-30

How to Cite

Ansyarif, A. R., Nur Aeni, & Sri Magfirah HS. (2025). Green Synthesis of Gold Nanoparticles from E-Waste for Colorimetric Detection of Salmonella sp. Al-Kimia, 13(2). Retrieved from https://journal.uin-alauddin.ac.id/index.php/al-kimia/article/view/61562

Issue

Vol. 13 No. 2 (2025): DECEMBER

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Article

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