Phyto-fabricated Pd@Ag bimetallic nanocomposites using carica papaya leaf extract: A dual-functional platform for catalysis and antimicrobial defence

Q2 Materials Science

Current Research in Green and Sustainable Chemistry Pub Date : 2025-01-01 DOI:10.1016/j.crgsc.2025.100465

Jayamani T , A. Elakkiya Devi , T. Augustine Arul Prasad , B. Scholastica Mary Vithiya , Lawrance Richardson

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Abstract

This study presents a green synthesis approach for bimetallic palladium–silver (Pd@Ag) nanocomposites using Carica papaya leaf extract, aimed at addressing urgent environmental and biomedical challenges. The synthesized Pd@Ag nanoparticles exhibited remarkable catalytic efficiency in degrading hazardous organic dyes, achieving 82 % and 88 % reduction of Congo Red and Methylene Blue, respectively, within minutes in the presence of NaBH₄. This highlights their strong potential in wastewater treatment and environmental detoxification. Furthermore, the Pd@Ag nanocomposites demonstrated broad-spectrum antimicrobial activity, showing significant zones of inhibition against major bacterial pathogens including Escherichia coli and Staphylococcus aureus, as well as antifungal effects against Candida albicans and Aspergillus niger. The dual functionality—efficient catalysis and potent antimicrobial defence—establishes these green-synthesized nanoparticles as promising candidates for sustainable environmental and biomedical applications.

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植物制造Pd@Ag使用番木瓜叶提取物的双金属纳米复合材料：催化和抗菌防御的双功能平台

本研究提出了一种利用番木瓜叶提取物绿色合成双金属钯银（Pd@Ag）纳米复合材料的方法，旨在解决紧迫的环境和生物医学挑战。合成的Pd@Ag纳米颗粒在降解有害有机染料方面表现出显著的催化效率，在NaBH4存在的情况下，几分钟内刚果红和亚甲基蓝的还原率分别达到82%和88%。这突出了它们在废水处理和环境解毒方面的巨大潜力。此外，Pd@Ag纳米复合材料显示出广谱抗菌活性，对大肠杆菌和金黄色葡萄球菌等主要细菌病原体具有显著的抑制作用，对白色念珠菌和黑曲霉也有抗真菌作用。双重功能-高效催化和有效的抗菌防御-使这些绿色合成纳米颗粒成为可持续环境和生物医学应用的有希望的候选者。

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