Effect of Phenolic Compounds on the Synthesis of Gold Nanoparticles and its Catalytic Activity in the Reduction of Nitro Compounds

Nanomaterials
Elisabete C B A AlegriaArmando J L Pombeiro

Abstract

Gold nanoparticles (AuNPs) were prepared using an eco-friendly approach in a single step by reduction of HAuCl₄ with polyphenols from tea extracts, which act as both reducing and capping agents. The obtained AuNPs were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), ultraviolet⁻visible spectroscopy (UV⁻vis), and X-ray photoelectron spectroscopy (XPS). They act as highly efficient catalysts in the reduction of various aromatic nitro compounds in aqueous solution. The effects of a variety of factors (e.g., reaction time, type and amount of reducing agent, shape, size, or amount of AuNPs) were studied towards the optimization of the processes. The total polyphenol content (TPC) was determined before and after the catalytic reaction and the results are discussed in terms of the tea extract percentage, the size of the AuNPs, and their catalytic activity. The reusability of the AuNP catalyst in the reduction of 4-nitrophenol was also tested. The reactions follow pseudo first-order kinetics.

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Citations

Dec 22, 2019·Environmental Science and Pollution Research International·Van-Dat DoanThanh-Danh Nguyen
Oct 28, 2019·Nanoscale Research Letters·Ericka Rodríguez-LeónRamón A Iñiguez-Palomares
Aug 29, 2019·Nanomaterials·Valentine P Ananikov
May 8, 2021·Biometals : an International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine·Amir NobaharMaria Clara Costa
May 30, 2021·Scientific Reports·Aaron Martínez-HigueraRamón Iñiguez-Palomares
Oct 1, 2021·Artificial Cells, Nanomedicine, and Biotechnology·Sohail SimonMarlene Geraldine du Preez

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Methods Mentioned

BETA
surface plasmon resonance
X-ray
scanning electron microscopy

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