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This work reports approach of facile and one-step synthesis of manganese oxidegraphite  composite and its catalytic activity towards degradation of methylene blue (MB) dye. The composite was characterized by using SEM/EDS, XRD, and FTIR. Degradation reaction of MB was investigated by varying composite doses, MB concentrations, temperatures and pH values. The residual concentration of the dye in the aqueous solution was determined using UV-Vis spectrophotometer. The kinetics of adsorption step was described by pseudo first-order and pseudo-second order kinetic models. The pseudo-second order well fitted the experimental data. Moreover, Langmuir-Hinshelwood (L-H) model pseudo first order was utilized to evaluate the degradation reaction rate at different experimental conditions. Degradation reaction rate has increased with the increase in composite dose to a certain point after which the rate decreased. Also, the degradation rate increased proportionally with temperature, while inversely proportional with dye concentration and pH value. A simple mechanism for adsorption and degradation of the dye over the composite was proposed. 

methylene blue, degradation, adsorption, manganese oxide, graphite.