Biosynthesis, characterization and study of the application of silver nanoparticle for 4-nitrophenol reduction, and antimicrobial activities.

Silver nanoparticles (AgNPs) were synthesized from (L) Walp extracted leaves, and characterized. The UV-Visible spectrum showed a peak between 411 and 415 nm at the Plasmon absorbance of the AgNPs. TEM showed that the size of AgNPs ranged from 5 to 13 nm. It was spherical with an average size of 11.08 nm. The size of AgNPs was 7 ± 6 nm and disperse in water. The AgNPs effectively reduced 4-Nitrophenol (4-NP) to 4-aminophenol (4-AP) in the presence of NaBH. The AgNPs exhibited a strong antioxidant and antibacterial activity against Gram-negative bacteria: (E. coli) and Klebsiella pneumonia and Gram-positive: and . The average zones of inhibition of AgNPs were: 29 mm for , 23 mm for , 17 mm for Klebsiella pneumonia and 15 mm for (E. coli). Thus, AgNPs has exhibted good antibacterial activity compared to antibiotics drug and 4-NP reduction.