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Keywords: Activated carbon; Nanocomposites; Mn3O4; Saturation magnetization Abstract: Activated carbon-Mn3O4 nanocomposites have been prepared by in situ decomposition of metal carboxylates into activated carbon matrix using acetate and benzoate of manganese as precursor for metal oxide. The morphology and size of the Mn3O4 particles inserted into activated carbon matrix have been investigated by IR, XRD, Scanning electron microscope and Transmission electron microscope. The magnetic nature of composites has been investigated by Vibrating Sample Magnetometer.