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Plant mediated synthesis of metal nanoparticles are fascinating due to its simplicity, quick rate of synthesis, eco friendliness and it can potentially provide more biocompatibility with biomolecules. We present for the first time Laser and ultrasound induced biogenic reduction and stabilization of CuO nanoparticles (CuO NPs) at room temperature using aqueous extract of Centella asiatica. This synthesis method is simple, flexible, economic, eco-friendly and reproducible for the size tunable synthesis of stable copper nanoparticles of diverse shape. The formation, morphology and crystalline structure of the synthesized nanoparticles are determined using UV-visible spectroscopy, Field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), Energy-dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD) and Photodegradation study. Moreover the catalytic activity of synthesized CuO NPs in the reduction of methylene blue was studied by UV–visible spectrophotometer. The synthesized CuO NPs are observed to have a good catalytic activity on the reduction of methylene blue by Centella asiatica which is confirmed by the decrease in absorbance maximum values of methylene blue with respect to time using UV–visible spectrophotometer and is attributed to the electron relay effect.
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