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In this research work, stable Cu and CuO nanoparticles (NPs) have been synthesized by Green synthetic route reducing different salts of copper metal by leaves of a wild plant “Calotropis gigantea”, that is rich in phenolic contents and antioxidants, act as reducing agent as well as stabilizing agent for Cu and CuO nanoparticles (NPs) synthesis. Some other methods were also successively adopted to synthesize these NPs which included the synthesis via chemical methods and then chemical used were replaced by green reagents in order to check the synthesis either effected by adopting green and chemical routes or not. Green routes were proved the best results. The size of the particles was found to < 40nm, confirmed by X-ray diffraction analysis(XRD) and scanning electron microscopy (SEM) and UV/VIS absorbance spectrum. Synthesized NPs were highly stable i.e. till 7 days. The catalytic ability of synthesized Cu and CuO nanoparticles (NPs) has been investigated against methylene blue dye. The degradation of dye followed first order reaction kinetics and the maximum degradation efficiency obtained after 20 minutes was 99.85 %.