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Green synthesis of silver nanoparticles using aganonerion polymorphum leaves extract and evaluation of their antibacterial and catalytic activity


Van Dat Doan, Van Thuan Le, Thi Dung Nguyen, Thi Lan Huong Nguyen, Hoai Thuong Nguyen*

Source title: 
Materials Research Express, 6: 1150g1, 2019 (ISI)
Academic year of acceptance: 

This study provides a fast, eco-friendly and low-cost method to synthesize stable colloidal solution of silver nanoparticles (AgNPs) using the extract of Aganonerion polymorphum (AP) leaves as a reducing and capping agent. Major parameters affecting the formation of biosynthesized AgNPs including AP leaf/water ratio, reaction time, temperature and pH were optimized at 60 g/4 00 ml, 10 min, 70 °C and 8, respectively. The AgNPs synthesized at these optimum parameters were carefully characterized using transmission electron microscopy (TEM), dynamic light scattering (DLS), powder x-ray diffraction (XRD), dispersive x-ray spectroscopy (EDS) and Fourier transform infrared spectroscopy (FTIR) techniques. TEM and DLS analysis revealed that the synthesized AgNPs were formed in multi-shapes with an average size of about 30 nm. Besides, XRD data showed a highly crystalline face-centered cubic structure of silver, while EDS spectra contained strong characteristic signals of silver element. Especially, the biosynthesized AgNPs demonstrated a good antibacterial ability toward E. coli and B. cereus after just one hour of exposure with high destroying efficiency up to 99.94% and 99.75%, respectively. It's also been found that the biosynthesized AgNPs have a good catalytic activity for the reduction of 4-nitrophenol into 4-aminophenol by NaBH4 in accordance with a pseudo first-order rate constant of 0.31 min−1.