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Copper nanoparticles were successfully prepared using Catharanthus roseus and Cajanus cajan leaf extract as the starting raw material. The bio- reduction of aqueous Cu+ ions by the leaf extracts of the plant has been demonstrated. In the present study we found that leaves were good source for the synthesis of Copper nanoparticles which has many advantages such as, ease with which the process can be scaled up, economic viability and to obtain smaller particle size. The color changes and characterization studies (FTIR, UV-Vis spectroscopy, XRD and SEM) were proved the formation of nanoparticle. The XRD study shows that Bio synthesis results in average grain size around 26 nm for Catharanthus roseus and 38 nm for and Cajanus cajan plant respectively. The bio with ultrasound reduced CuO nanoparticles exhibited remarkable size dependent catalytic properties in a reduction reaction of methylene blue. The highest photo reduction was obtained using Catharanthus roseus plant leaf extract. The utilization of biosynthetic procedure opens new possibilities for the design of ideal catalyst which exhibits maximum activity and stability.
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