Study on Synthesis of PVA Stabilized Silver Nanoparticles using Green Synthesis and Their Application for Catalysis
- PDF / 910,164 Bytes
- 4 Pages / 612 x 792 pts (letter) Page_size
- 26 Downloads / 246 Views
Study on Synthesis of PVA Stabilized Silver Nanoparticles using Green Synthesis and Their Application for Catalysis Ja Young Cheon and Won Ho Park Department of Advanced Organic Materials and Textile System Engineering, Chungnam National University, Daejeon, Korea ABSTRACT The parameters influencing the formation of silver nanoparticles are reported. We used poly(vinyl alcohol) (PVA), maltose and silver nitrate as stabilizer, reductant and silver nanoparticles precursor, respectively. The formation of nanoparticles depended upon reaction temperature and pH of solution. The pH of solution controlled by HCl and NaOH. The reaction rate and amount of nanoparticles increase with increasing the reaction temperature. Also, formation of nanoparticles are influenced by pH. The size distribution and dispersion of Ag nanoparticles formed in PVA solution were observed by Transmission electron microscopy (TEM) and the reaction rate and amount of nanoparticles were characterized UV-vis spectrophotometer. INTRODUCTION Nanoparticles(NPs) are extensively investigated in recent years because of their various properties as catalytic activity, electrical properties, optical activity, and antimicrobial activity, etc.. For these NPs, the catalytic activity as well as their electrical, thermodynamic and chemical properties are dependent on their size and shape. So, the control over their morphology and size is thus an important aim. Specific control of shape and size is often difficult. Generally, this is achieved by varying the synthesis method, reducing agent, stabilizer, reaction temperature and pH in the reaction system. NPs were prepared by physical and chemical method as chemical reduction method, electro chemical method, sonication method, template method and irradiation method (microwave, γ-ray, light), etc.. Mainly metal NPs are prepared by chemical reducing method using organic solvents and toxic reducing agent. However, the environmental and biological hazards are usually caused due to the use of noxious reducing and/or stabilizing agents in the synthesis procedures, like hydroxylamine (NH2OH), N,N-dimethylformamide (DMF), sodium borohydride (NaBH4) and hydrazine (N2H4), etc.. With the increasing awareness of environmental protection, researchers are inclined to focus on the ‘green chemistry’. So, in the past decade, synthesis of silver NPs have been studied using the hyaluronan, gelatin, starch, chitosan and water-soluble polymer, etc. as reducing and/or stabilizing agents instead of synthetic chemicals. Poly(vinyl alcohol) (PVA) is a water-soluble, non-toxic, biocompatible and biodegradable synthetic polymer. Based on these features, PVA has attracted considerable in the biomedical, plastics, and textile fields.
In this study, Ag NPs could be prepared by chemical reduction based on green chemisty in different reaction temperature and pH. At this time, poly(vinyl alcohol) (PVA) and maltose were used as stabilizing and reducing agents, respectively. And silver nitrate is used for precursor of Ag NPs. The reaction rate of Ag N
Data Loading...
