• adsorption;
  • disperse blue 2BLN;
  • microwave;
  • red mud


The ability of red mud (RM) to adsorb disperse blue 2BLN from water was studied and the condition of adsorption process was optimized. The results showed that the microwave activated RM had good adsorption capacity. The adsorption process was in accord with Langmuir isotherm model. The saturated adsorption amount of disperse blue 2BLN by activated RM was ∼45 mg/g. The factors that affected the adsorption process included dosage of RM, temperature, and pH value. The optimal condition was 40°C, pH 3.0, 15 g/L RM and 30 min reaction time, under which the removal percentages of color, chemical oxygen demand and total organic carbon reached ∼99%, 64% and 50%, respectively. © 2010 American Institute of Chemical Engineers Environ Prog, 2010