Plant extract mediated biosynthesis of Al2O3 nanoparticles- a review on plant parts involved, characterization and applications

Metal oxide nanoparticles (NPs) produced by green chemistry approaches have received notable attention because of their significant physicchemical properties and their remarkable uses in the area of nanotechnology. Currently, the sustainable improvement of synthesizing NPs by distinctive parts of plant extract has become a major focus of scientists and researchers because of these NPs have minimum pernicious effect in the ecosystem and minimum noxiousness for the human health. Among the all metal oxide nanoparticles, alumina nanoparticles (Al2O3 NPs) draw peculiar attention due to their significant applications in ceramics, textiles, drug delivery, catalysis, wastewater treatment and biosensor. Many natural biomolecules in plant extracts such as saponins, tannins, alkaloids, amino acids, enzymes, proteins, coumarins, polysaccharides, polyphenols, steroid and vitamins could be participated in bioreduction and stabilization of Al2O3 NPs. In the last decade, innumerable efforts were made to develop a sustainable ecoaccommodating method of synthesis to avoid the perilous byproducts. This review focuses on the plants used for the green fabrication of Al2O3 NPs, their characterization methods and applications.