Green synthesis and characterization of Cr2O3 nanoparticle prepared by using CrCl3.6H2O and Roselle extract

Abstract

The nanoparticles were synthesized from chromium oxide using Roselle extract in two methods, the first by (simple chemical method) and the second by (sol-gel method). These technologies are a new, environmentally friendly and cheap. Roselle contains plant materials and biomolecules (phenols, alkalis, vitamins, amino acids, quinones, etc.) that convert chromium chloride hexahydrate (CrCl3.6H2O) into chromium nanoparticles. The plant extracts also act as diluents, stabilizers and anti-caking agents Chromium oxide (Cr2O3) nanoparticles were prepared by sol-gel method. Nano powders are annealing at different. X-ray diffraction (XRD) analysis showed that the size of the crystals decreased from (16.12) nm by the simple chemical method to (13.8) nm of Cr2O3 using sol-gel (200),(13.5)nm using sol-gel(400),(13.3)nm of Cr2O3 using sol0gel(600). The (Scanning electron microscopy (SEM) showed that the nanoparticles of Cr2O3 NPs with (36.38) nm in a simple chemical method while the (SEM) in sol-gel method (200) showed that the nanoparticles of Cr2O3 NPs using Roselle extract are spherical or semispherical in shape) with a particle size of (89.83) nm in scale 200nm, the results no similar any source. Ultraviolet-visible (UV-Vis) showed value the band gap from of 2.9 eV of Cr2O3 NPs in a simple chemical method, while in a sol-gel method of Cr2O3 NPs was (3, 3.2, 3.35, 3.5) ev at different temperatures, In this research were obtain on high pure, small particle size, and large energy gap of chromium oxide NPs in a sol-gel method better than of chromium oxide NPs in a simple chemical method. The study revealed that the Chromium oxide nanoparticles synthesized using Roselle extracts could be used as antibacterial agent for human pathogenic bacteria. The aim of this research is to obtain chromium oxide (Cr2O3) nanoparticles using inexpensive and available materials, in Simple method.