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In this report, ultrasonication and Andean blackberry leaf extract are employed for the fabrication of palladium nanoparticles (PdNPs); and further evaluated its photocatalytic activity against methylene blue (MB). The as-synthesized PdNPs were characterized using UV–visible spectroscopy, transmission electron microscopy (TEM), Dynamic light scattering (DLS) and X-ray diffraction (XRD). TEM analysis demonstrated the formation of decahedron shape PdNPs with a diameter of 55–60 nm and XRD confirmed its crystalline nature. It showed photocatalytic decomposition of MB (>72%, k = 0.002164 min−1, 10 mg/L) in an aqueous solution under solar light irradiation. From the results obtained it is suggested that ultrasound agitated aqueous leaf extract demonstrates a simple, rapid, inexpensive method and should be utilized in future as green technology for the fabrication of nanoparticles.