Sonicated sol-gel method was used to prepare LaNiO 3 from lanthanum nitrate hexahydrate La(NO 3) 3 .6H 2 O(LN), nickel nitrate Ni(NO 3) 3 .6H 2 O(NN), glycine and urea. Nanocrystalline LaNiO 3 powder was formed after heating at 175 °C in 5 min. Particle size of LaNiO 3 nanopowder was determined by Debay Scherrer's equation and was found 48 nm. Prepared nanocatalyst characterized with the help of XRD, TGA, SEM, IR, BET surface area, EDX. Surface area of LaNiO 3 was 9.22 m 2 /g. We have reported first time good antibacterial activity of LaNiO 3 for Staphylococcus aureus. Zone of inhibition for LaNiO 3 was 13 mm studied with the help of agar cup method.
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