green synthesis of zno nanoparticles and their photocatalyst degradation and antibacterial activity

The current study aimed to synthesize nanoparticles of zinc oxide (zno) using the extract of acalyphaindica leaves and their photocatalyst degradation and antibacterial properties were also measured. thebiosynthesized nanoparticles were analyzed using xrd, uv-visible, ft-ir, and sem with edax, dls, pl,and zeta potential analysis. the synthesized nanoparticles had a mean size of 16 nm measured by xrdwhich was highly pure, and their spherical shape was confirmed by sem. the uv-visible confirmed thatzno nanoparticles have a direct band gap energy is 3.34 ev. the measured zeta size and potential ofsynthesized nanoparticles were 46 nm and -27 mv, respectively, determined by the dls technique can beconsidered moderately stable colloidal solutions. the ft-ir analysis confirmed the presence of functionalgroups in the leaf extract and the zno nanoparticles. the biosynthesized zno nanoparticles have ahomogeneous spherical morphology and the average particle is 35 nm. the pl analyses performed onsynthesized nanoparticles showed a sharp blue band at 362 nm, which was attributed to the defects ofstructure in zno crystals. during natural sunlight illumination, zno nanoparticles demonstrated notabledegradation of the dye methyl blue (mb). at 90 min of illumination, the degradation efficiency achievedwas 96 %. antibacterial properties were observed for synthesized nanoparticles against four bacterialstrains, including bacillus subtilis, staphylococcus aureus, pseudomonas aeruginosa, and escherichia coli.the highest zone of inhibition was observed against escherichia coli (25.2 mm). overall, these studiesindicate that acalypha indica is a good sell for planting, and has the greatest chance of being used todevelop nanoparticles for protection against environmental pollution and human health.