Green Synthesis of Gold Nanoparticles Using  Citrus aurantiifolia  Extract and Their Potential for Polystyrene Microplastic Detection

Muhammad Bakhru Thohir; Nindy Callista Elvania; Anggi Tri Nurhaliza

doi:10.22146/ijc.112466

Green Synthesis of Gold Nanoparticles Using Citrus aurantiifolia Extract and Their Potential for Polystyrene Microplastic Detection

https://doi.org/10.22146/ijc.112466

Muhammad Bakhru Thohir^(1*), Nindy Callista Elvania⁽²⁾, Anggi Tri Nurhaliza⁽³⁾

(1) Chemistry Study Program, Universitas Bojonegoro, Jl. Lettu Suyitno No. 2, Bojonegoro 62119, Indonesia
(2) Environmental Science Study Program, Universitas Bojonegoro, Jl. Lettu Suyitno No. 2, Bojonegoro 62119, Indonesia
(3) Chemistry Study Program, Universitas Bojonegoro, Jl. Lettu Suyitno No. 2, Bojonegoro 62119, Indonesia
(*) Corresponding Author

Abstract

Gold nanoparticles (AuNPs) were successfully synthesized through a simple and green route using dried Citrus aurantiifolia extract as a bioreductant. The synthesis was carried out at a bioreductant concentration of 10%, a gold precursor concentration of 0.60 mM, pH 7, and a reaction time of 5 min. The formation of AuNPs was indicated by a distinct color change from pale yellow to wine red, the appearance of a Tyndall effect under laser illumination, and a UV-vis absorption peak at 534 nm. Particle size analysis (PSA) revealed an average diameter of 52.59 nm with a zeta potential of −24.24 mV, while FTIR spectra showed characteristic absorption bands at 3268, 2100, and 1640 cm⁻¹, corresponding to functional groups involved in reduction and stabilization. Detection experiments demonstrated that green-synthesized AuNPs were capable of detecting polystyrene microplastics using acetone-assisted aggregation, with a detection limit of 5 mg/L.

Keywords

gold nanoparticles; green synthesis; Citrus aurantiifolia; detection; polystyrene microplastics

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DOI: https://doi.org/10.22146/ijc.112466