Microwave-assisted facile green synthesis of silver nanoparticles and spectroscopic investigation of the catalytic activity

Bulletin of materials science

Beena Mathew²  Siby Joseph¹ 

[1] Department of Chemistry, St. George’s College, Aruvithura, Kottayam 686 122, Kerala, India$$Department of Chemistry, St. George’s College, Aruvithura, Kottayam 686 122, Kerala, IndiaDepartment of Chemistry, St. George’s College, Aruvithura, Kottayam 686 122, Kerala, India$$;School of Chemical Sciences, Mahatma Gandhi University, Kottayam 686 560, Kerala, India$$School of Chemical Sciences, Mahatma Gandhi University, Kottayam 686 560, Kerala, IndiaSchool of Chemical Sciences, Mahatma Gandhi University, Kottayam 686 560, Kerala, India$$

关键词: Microwave;    green;    silver nanoparticle;    I-carrageenan;    catalysis.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

Silver nanoparticles have been successfully synthesized in aqueous medium by a green, rapid and costefficient synthetic approach based on microwave irradiation. In this study, iota-carrageenan (I-carrageenan) is used both as reducing and stabilizing agent. The formation of nanoparticles is determined using UVâ€�?�vis, Fourier transform infrared (FTIR), X-ray diffraction (XRD), energy-dispersive X-ray (EDX) and high-resolution-transmission electron microscopic (HR-TEM) analysis. Transmission electron microscopic (TEM) images show that the nanoparticles are of spherical shape with an average diameter of 18.2 nm. I-carrageenan-stabilized silver nanoparticles show outstanding catalytic activity for the reduction of 4-nitrophenol in the presence of NaBH₄ in aqueous medium. The reaction follows pseudo-first-order kinetics and the reaction rate increases with the increase in amount of the catalyst. The study of the temperature dependence of reaction rate gives activation energy of 42.81 kJ mol^âˆ�?1. The synthesized silver nanoparticles are anticipated to be a promising material for pollution abatement.

【 授权许可】

Unknown