Fabrication of Cr2O3 Nanoparticles Using Okra Plant Extract for Antimicrobial Activity

Cr2O3 NPs were synthesized using Okra extract with two methods; the simple chemical method and sol-gel method. XRD analysis showed that the crystal size of Cr2O3 in a simple chemical method was (16.15) nm and with sol-gel method were 16.6 nm, 16.14 nm and 16 nm using annealing temperature of 200, 400 and 600 °C respectively. FE-SEM analysis showed that the nanoparticles of Cr2O3 NPs when using a simple chemical and the sol-gel methods, with particle sizes of (83.74-132.1) nm, (18.92-27.68) nm, (24.19-39.08) nm, and (12.04-15.83) nm that corresponding to a simple chemical method at 200 °C, sol-gel method at 200, 400 and 600 °C respectively. UV-Vis demonstrated that the band gap value of Cr2O3 NPs was 2.9 eV with a simple chemical method, while in a sol-gel method was (3.15, 3.3, 3.5) eV at different temperatures. The study showed an effective antibacterial activity of Cr2O3 NPs such was (12-14) mm  of Gram's negative bacteria and (15-18) mm for Gram's positive bacteria in simple chemical method at (200) °C. The higher antibacterial activity of three different temperatures of sol-gel method was (20) mm for Gram's negative bacteria and (23) mm for Gram's positive bacteria at 200°C.