Mn3O4 were synthesized via the hydrothermal method at 200°C for 24 h, using surfactants. The resultant products examined by powder X-ray diffraction (XRD), Raman spectroscopy, Fourier transform infrared spectroscopy (FTIR), transmission electronic microscope (TEM), UV-visible and BET surface area analysis. as-prepared materials used adsorption of methylene blue dye (MB). effect various experim...