Green Synthesis, Characterization and Antibacterial Activity of ZnO Nanoparticles

Abstract

In the present study, mehendi extract (Lawsonia inermis) was used for phytosynthesis of ZnO nanoparticles using 0.1 M Zn(NO 3 ) 2 as precursor under alkaline condition using NaOH with vigorous stirring for 2 h. ZnO NPs obtained were characterized by UV-Vis spectroscopy, XRD, SEM and TEM that showed change in shape and size. Hexagonal particles were formed due to plant extract relative to the rod shaped particles in absence of plant extract. Further the antibacterial property of ZnO NP synthesized by green method was more effective than those synthesized in absence of plant extract. The antibacterial activity study of both the synthesized ZnO nanoparticles reveals that the nanoparticles synthesized using mehendi extract are more effective than the particle synthesized without mehendi extract. Thus, the use of leaf extract as capping agent would improve the antibacterial property of ZnO nanoparticle. However, bacteriocidal effect of these nanoparticles varies with respect to the organism tested.

Zinc Oxide for Functional Textile Coatings: Recent Advances

“…ZnO generally crystallizes into three main structures, i.e., hexagonal wurtzite, cubic rocksalt, and cubic zinc blende structures, among which the wurtzite crystal structure is the most common since it is thermodynamically stable under ambient conditions [52]. ZnO can be present in a wide diversity of shapes, such as nanocombs, nanorings, nanohelixes/nanosprings, nanobelts, nanowires, and nanocages [53]; needle-like, flower-like, rod-like, flake-shaped, and spherical nanodiscs [28]; crushed stone-like, cylinder-shaped, and bullet-like structures; sheets, polyhedra, and ellipsoids [2]; hexagonal plate-like structures [54,55]; rod-shaped particles [54,56]; pyramid-shaped structures [57]; multispheres [58]; doughnut-shaped structures [59][60][61]; nanosheets [62]; dumbbell-shaped structures [34]; nanoleaves [63]; nanobows [64]; and star, multi-pod and spike-shaped structures [65].…”

Novel Green In Situ Synthesis of ZnO Nanoparticles on Cotton Using Pomegranate Peel Extract

“…Moreover, the synthesis of ZnO in an acidic medium (pH ˂ 7) hinders the growth and formation of ZnO due to the low amount of hydroxyl ions (OH − ) that contribute to the formation of the intermediate molecule zinc hydroxide (Zn(OH) 2 ), which facilitates the formation of ZnO [ 18 , 19 , 20 ]. The majority of green syntheses of ZnO are still performed in the presence of NaOH or KOH, since alkaline pH is required for successful reduction from zinc salt [ 21 , 22 , 23 , 24 ]. Additionally, cellulose exposed to an alkaline medium creates more adsorption sites for zinc ions [ 6 , 21 , 25 ].…”

Comparative study of zinc oxide nanoparticles and its bulk form on liver function of Wistar rat

“…Zinc oxide nanoparticles (ZnO NPs) are one of the most widely used NPs with wide-ranging applications in medical and industrial processes (Tiwle and Sanghi, 2012; Vandebriel and De Jong, 2012; Zahra et al, 2017). In biomedical fields, ZnO NPs are explored for their anticancer activity, and they are also used as fillers in orthopedic and dental implants; nowadays, they are finding applications in the pharmaceutical and food industries (Srivastav et al, 2017; Upadhyaya et al, 2018).…”