Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Green Synthesis of Highly Concentrated and Stable Colloidal Dispersion of Core-Shell Silver Nanoparticles (AgNPs-Shell) and their Antimicrobial and Ultra-high Catalytic Properties

Version 1 : Received: 30 March 2021 / Approved: 1 April 2021 / Online: 1 April 2021 (10:20:24 CEST)

A peer-reviewed article of this Preprint also exists.

Ali, A.; Sattar, M.; Hussain, F.; Tareen, M.H.K.; Militky, J.; Noman, M.T. Single-Step Green Synthesis of Highly Concentrated and Stable Colloidal Dispersion of Core-Shell Silver Nanoparticles and Their Antimicrobial and Ultra-High Catalytic Properties. Nanomaterials 2021, 11, 1007. Ali, A.; Sattar, M.; Hussain, F.; Tareen, M.H.K.; Militky, J.; Noman, M.T. Single-Step Green Synthesis of Highly Concentrated and Stable Colloidal Dispersion of Core-Shell Silver Nanoparticles and Their Antimicrobial and Ultra-High Catalytic Properties. Nanomaterials 2021, 11, 1007.

Journal reference: Nanomaterials 2021, 11, 1007
DOI: 10.3390/nano11041007

Abstract

The versatile one-pot green synthesis of a highly concentrated and stable colloidal dispersion of AgNPs was carried out using the self-assembled tannic acid without using any other hazardous chemicals. Tannic acid (Plant-based polyphenol) was used as a reducing and stabilizing agent for silver nitrate in a mild alkaline condition. The synthesized AgNPs were characterized for their concentration, capping, size distribution, and shape. The experimental results confirmed the successful synthesis of nearly spherical and highly concentrated (2281 ppm) AgNPs, capped with poly-tannic acid (AgNPs-PTA). The average particle size of AgNPs-PTA was found 9.90 ± 1.60 nm. The colloidal dispersion of synthesized nanoparticles was observed stable for more than 15 months in the ambient environment (25 oC, 65 % relative humidity). The synthesized AgNPs-PTA showed an effective antimicrobial activity against Staphylococcus Aureus Escherichia coli. Ag-PTA also exhibited enhanced catalytic properties. It reduces 4-nitrophenol into 4-aminophenol in the presence of NaBH4 with a normalized rate constant (Knor = K/m) of 615.04 mL·s-1·mg-1. Furthermore, AgNPs-PTA were stable for more than 15 months under ambient conditions. The unique core-shell structure and ease of synthesis render the synthesized nanoparticles superior to others, with potential for large-scale applications, especially in the field of catalysis and biomedical.

Subject Areas

Biomedical; Green Synthesis; Silver Nanoparticles; Colloidal stability; Antimicrobial and catalytic activity

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