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The natural coconut shell activated carbon (AC) was firstly treated with KOH in advance, and the Mn3O4/AC composites in various AC rations were prepared by the hydrothermal process and subsequent heat treatment. The resulting Mn3O4/AC composites were characterized by means of different techniques including X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy...
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