Synthesis of Au, Ag, and Au–Ag Bimetallic Nanoparticles Using Pulicaria undulata Extract and Their Catalytic Activity for the Reduction of 4-Nitrophenol

Plant extract of Pulicaria undulata (L.) was used as both reducing agent and stabilizing ligand for the rapid and green synthesis of gold (Au), silver (Ag), and gold–silver (Au–Ag) bimetallic (phase segregated/alloy) nanoparticles (NPs). These nanoparticles with different morphologies were prepared...

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Published in:Nanomaterials (Basel, Switzerland) Switzerland), 2020-09, Vol.10 (9), p.1885
Main Authors: Khan, Merajuddin, Al-hamoud, Khaleel, Liaqat, Zainab, Shaik, Mohammed Rafi, Adil, Syed Farooq, Kuniyil, Mufsir, Alkhathlan, Hamad Z., Al-Warthan, Abdulrahman, Siddiqui, Mohammed Rafiq H., Mondeshki, Mihail, Tremel, Wolfgang, Khan, Mujeeb, Tahir, Muhammad Nawaz
Format: Article
Language:English
Subjects:
Ambient temperature
Aminophenol
Aqueous solutions
bimetallic
Bimetals
Catalytic activity
Composition
Gold
Gold base alloys
Morphology
Nanoalloys
Nanoparticles
Nitrophenol
plant extract
Plant extracts
Pollutants
Pulicaria undulata
Reducing agents
Silver
Spectrum analysis
Synthesis
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Summary:Plant extract of Pulicaria undulata (L.) was used as both reducing agent and stabilizing ligand for the rapid and green synthesis of gold (Au), silver (Ag), and gold–silver (Au–Ag) bimetallic (phase segregated/alloy) nanoparticles (NPs). These nanoparticles with different morphologies were prepared in two hours by stirring corresponding metal precursors in the aqueous solution of the plant extracts at ambient temperature. To infer the role of concentration of plant extract on the composition and morphology of NPs, we designed two different sets of experiments, namely (i) low concentration (LC) and (ii) high concentration (HC) of plant extract. In the case of using low concentration of the plant extract, irregular shaped Au, Ag, or phase segregated Au–Ag bimetallic NPs were obtained, whereas the use of higher concentrations of the plant extract resulted in the formation of spherical Au, Ag, and Au–Ag alloy NPs. The as-prepared Au, Ag, and Au–Ag bimetallic NPs showed morphology and composition dependent catalytic activity for the reduction of 4-nitrophenol (4-NPh) to 4-aminophenol (4-APh) in the presence of NaBH4. The bimetallic Au–Ag alloy NPs showed the highest catalytic activity compared to all other NPs.
ISSN:2079-4991
2079-4991
DOI:10.3390/nano10091885