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 physic-chemical 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, waste-water 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 eco-accommodating method of synthesis to avoid the perilous byproducts. In this review, I focused on the plants which are used for the green fabrication of Al2O3 NPs, their characterization methods and applications are investigated.