Nano technology is one of the latest and fastest growing research methods. The present study describes the synthesis of the Cerium oxide nanoparticles by biological (green) method. Compared to the other methods green synthesis is the preferred method. This is because of less hazardous to the nature, cost effective, easily and abundantly available feature. Cerium oxide nano particles are synthesized from the Hibiscus Sabdariffa flower extracts by the method of Co-precipitation. The plant extract

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... acts as the capping agent and as a reducing agent in the synthesis of nano particles. The synthesized Cerium Oxide nano particles were analyzed by Fourier Transform Infrared Spectroscopy, Particle Size distribution Scanning Electron Microscope (SEM) with the EDAX. IV. RESULTS AND DISCUSSION The nanoparticles were synthesized by simple co precipitation method also as green method using Hibiscus Sabdariffa flowers extract. The flower extracts acts as a reducing agent and also act as capping agent. The following conclusions were drawn from the obtained results. The green method of synthesis of Cerium Oxide nanoparticles was rapid process, economical, less toxic to the environment and sustainable. The characterization results like Fourier Transform Infrared spectroscopy and SEM clearly indicates the effective formation of the Cerium oxide nanoparticles. The peaks at 389.36 cm -1 from FTIR analysis clearly indicates the Finger Print region of the cerium.