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Vol. 37 No. 7 (2025): Vol 37 Issue 7, 2025

Copyright (c) 2025 Dr Augustine Arul prasad T, Jayamani Thomas, Scholastica Mary Vithiya B

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This work is licensed under a Creative Commons Attribution 4.0 International License.

Green Synthesis of Platinum@Silver (Pt@Ag) Bimetallic Nanoparticles Using Carica papaya Aqueous Leaf Extract for Catalytic Reduction of Dyes and their Antimicrobial Activity

https://doi.org/10.14233/ajchem.2025.33982
T. Jayamani
PG and Research Department of Chemistry, Dwarakadoss Goverdhandoss Vaishnav College (Autonomous), (Affiliated to University of Madras) Chennai-600106, India; Department of Chemistry, Alpha College of Engineering, Thirumazhisai, Chennai-600124, India
https://orcid.org/0009-0000-7173-8123
T. Augustine Arul Prasad
PG and Research Department of Chemistry, Dwarakadoss Goverdhandoss Vaishnav College (Autonomous), (Affiliated to University of Madras) Chennai-600106, India
https://orcid.org/0000-0002-6558-6685
B. Scholastica Mary Vithiya
PG and Research Department of Chemistry, Auxilium College (Autonomous), (Affiliated to Thiruvalluvar University, Vellore), Vellore-632006, India
https://orcid.org/0000-0001-5486-2085

Corresponding Author(s) : T. Augustine Arul Prasad

augustineap@gmail.com

Asian Journal of Chemistry, Vol. 37 No. 7 (2025): Vol 37 Issue 7, 2025

Abstract

This study presents a green, plant-mediated synthesis of platinum@silver (Pt@Ag) bimetallic nanoparticles using aqueous extracts of Carica papaya leaves as a bio-reducing and capping agent. The synthesized nanoparticles were characterized via UV-Vis spectroscopy, FTIR, XRD, SEM and HRTEM, confirming their crystalline nature, face-centered cubic structure and nanoscale core-shell morphology. FTIR analysis revealed functional groups such as hydroxyl and amide, supporting the biomolecular involvement in nanoparticle stabilization. The Pt@Ag nanoparticles exhibited a significant catalytic activity in the reduction of methylene blue and Congo red dyes, with a pseudo-first-order rate constant of 0.00512 min-1 for methylene blue. Furthermore, the antimicrobial studies demonstrated significant inhibition zones against both Gram-positive and Gram-negative bacteria, outperforming standard antibiotics in some cases. The observed synergistic effects of platinum and silver enhance both redox and ion-release mechanisms, making these nanoparticles promising candidates for environmental remediation and biomedical applications.

Keywords

Platinum@Silver nanoparticles Carica papaya Antimicrobial activity Degradation activity Organic dyes
(1)
Jayamani, T.; Prasad, T. A. A.; Vithiya, B. S. M. Green Synthesis of Platinum@Silver (Pt@Ag) Bimetallic Nanoparticles Using Carica Papaya Aqueous Leaf Extract for Catalytic Reduction of Dyes and Their Antimicrobial Activity. ajc 2025, 37, 1796-1802.
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