The Biogenic Synthesis of Cobalt Monometallic and Cobalt–Zinc Bimetallic Nanoparticles Using Cymbopogan citratus L. Leaf Extract and Assessment of Their Activities as Efficient Dye Removal and Antioxidant Agents

In this work, green synthesized cobalt monometallic and cobalt–zinc bimetallic NPs were prepared by bioreduction of metallic salts with Cymbopogan citratus plant extract. Biosynthesized nanoparticles (NPs) characterized using diverse techniques such as FTIR, UV-Visible spectroscopy, SEM, XRD, EDX analyses. UV-visible spectra for green-synthesized in the range between 300 to 350 nm, which confirmed formation stable NPs. The average particle size CoNPs calculated XRD analysis was found be 22.77 nm that Co-Zn BMNPs 14.8 nm. Different functional groups extract, served a reducing stabilizing agent NPs, identified FTIR spectra. Cobalt used evaluation antioxidant, anti-inflammatory, dye degradation activity. Green-synthesized exhibited excellent antioxidant activity scavenging DPPH free radicals. Green utilized removal methylene blue (MB) dye. parameters effect temperature, pH, concentration on adsorbent doses analyzed optimized. best percentage obtained compared CoNPs. did not display good anti-inflammatory because presence secondary metabolites inhibited them react proteins.