Since hexavalent chromium is one of the major pollutants released from the tanneries that have a direct effect on man and animals. In this study reports adsorption of hexavalent chromium (Cr (VI)) ions from tannery waste water collected from tannery industrial region using activated carbon prepared from Groundnut plant. The sample of impregnated Groundnut stem and Groundnut (Arachis hypogaea) stem were activated in muffle furnace at 650 -700°C respectively for 90 minutes then cooled at room temperature. Various adsorption characteristics such as dose of the adsorbent, agitation time, initial Cr (VI) ion concentration, pH of the solution and temperature on adsorption were studied for removal of Cr (VI) ions from aqueous solution by batch mode. Also the equilibrium adsorption was analyzed by the Langmuir, Freundlich, Tempkin and D-R isotherm models. The order of best describing isotherms was given based on R2 value. The pseudo second-order kinetic model best fitted with the Cr (VI) adsorption data. Thermodynamic parameters were also determined and results suggest that the adsorption process is a spontaneous, endothermic and proceeded with increased randomness.