removal of reactive black 5 (rb5) dye from aqueous solution by using of adsorption onto activated red mud: kinetic and equilibrium study

industrial wastewater included the dyes one of the important sources of environmental pollution that founded in loom wastewater which are harmful for human health and environment. therefore, the purpose of this research was investigated removal of rb5 dye from aqueous solution by using of adsorption onto activated red mud as an cheap adsorbent. this research was experimental- laboratorial study. the first activated red mud by mixed 20 ml nitric acid and 10 gr red mud toward 24 h, then was dry in 150 0c for 4 h. then, acquired equilibrium time equal to 60 min, with constant other parameters. the effect of ph, contact time and initial rb5 dye concentration , kinetic and isotherm models was studied at the constant of equilibrium time equal to 60 min. then data interpreted and analyzed by excel software and regression confession. removal of dye was decreased by increasing of ph and initial dye concentration and increased by increasing of contact time. the results showed rb5 adsorption follows freudlich isotherm (r2= 0.9836) model. pseudo second order models (r2= 0.9882, qe= 1.67 mg/g) best describe rb5 removal by using of adsorption onto activated red mud. the result of present work shows that can of red mud used as an effective and cheap adsorbent in fast time with high efficiency for the treatment of textile wastewater.