Title Lead oxide nanoparticles for the photocatalytic degradation of methylene blue from aqueous solutions under solar irradiation Type Presentation Keywords Lead oxide, Nanoparticles, Rosmarinus officinalis, Methylene blue, Degradation Abstract Herein, lead oxide (PbO) nanoparticles were successfully fabricated using Rosmarinus officinalis. The photocatalytic activity of PbO nanoparticles was evaluated for the degradation of methylene blue as an organic dye. About 91% of photo-degradation of methylene blue dye was achieved in 60 minutes under solar irradiation. The obtained results revealed that the PbO nanoparticles could be used as a low-cost green photocatalyst for the efficient degradation of methylene blue from aqueous media in environmental pollution clean-up. Researchers Honarmand Moones (First researcher)atena naeimi (Second researcher)Mohammad Ali Chaji (Third researcher)