Abstract: The aim of the present study is to discover the effect of nano-porous adsorbent of Pomelo fruit peel wastes for removing Congo red dye (CR) from aqueous solution. In batch equilibrium experiments, the CR dye solutions were prepared by dissolving dye in deionzied water to the required concentrations. The effect of adsorption isotherm were calculated by carryout a series of isotherm at different adsorbent dosages (1.0, 2.0, 3.0 g L^-1), temperatures (30, 40 and 60°C) and pH (5.99, 6.72, 8.73), respectively. The adsorption equilibrium data were analyzed by using various adsorption isotherm models and the results have shown that adsorption behavior of the dye could be described reasonably well by Langmuir and Freundlich models. The characteristic parameters for each isotherm have been determined. The monolayer adsorption capacity determined was reasonably high (g L^-1) at adsorbent dosage 1.049 (g L^-1), Temperature 1.081 (g L^-1) and pH 1.270 (g L^-1) for adsorption of CR dye respectively. The monolayer adsorption capacity was determined to be 1.08 to 0.75 mg g^-1. We concluded based on these results that Pomelo peel nano-porous adsorbent was an attractive candidate for removing CR dye from the wastewater. The present study suggests that the modified Pomelo peel nano-adsorbent was a cost-effective and attractive candidate for dyestuff removal from industrial wastewater.