Sustainable Synthesis of Zinc Oxide Nanomaterials Via Plant-Mediated Methods

Green nanoparticle synthesis has emerged as a sustainable and environmentally benign approach for the production of metal and metal oxide nanoparticles. Unlike conventional physical and chemical methods that involve toxic reagents, high energy consumption, and hazardous byproducts, green synthesis utilizes biological resources such as plant extracts, microorganisms, and biomolecules as reducing and stabilizing agents. Plant-mediated synthesis is particularly advantageous due to its simplicity, cost-effectiveness, scalability, and rapid reaction kinetics. Phytochemicals including flavonoids, phenolics, alkaloids, proteins, and carbohydrates play a crucial role in the reduction of metal ions and stabilization of the formed nanoparticles through functional groups such as hydroxyl, carbonyl, and amine groups. The integration of green chemistry principles with nanotechnology not only minimizes environmental impact but also promotes the development of sustainable materials for industrial applications. The present study reports the green synthesis and biological applications of zinc nanoparticles (ZnNPs) using Terminalia arjuna leaf extract. The synthesized ZnNPs were characterized using UV–Visible spectroscopy and FTIR analyses to confirm their formation, functional groups involvement, crystalline nature, and surface morphology. The UV–Vis spectra showed a characteristic absorption peak confirming nanoparticle formation, while FTIR analysis indicated the participation of bioactive functional groups in reduction and stabilization. Antioxidant assay of the synthesized zinc nanoparticle showed 65% of inhibition at 10 μL concentration. Antibacterial activity of the green nanoparticle showed greater zone of inhibition against both Gram –- positive and Gram-negative bacterial strains. The synthesized green zinc oxide nanoparticles offer safer and sustainable alternatives for biomedical applications.