The neutral red dye is used in textile and leather industries and in environmental research. Therefore, the removal of this dye from the factory wastewaters is environmentally significant. In this research, two very inexpensive, abundant and easily available adsorbents, i.e. sugarcane bagasse and sawdust, were employed to remove the neutral red from water. The effects of various conditions such as pH, electrolyte concentration, adsorbent dose, contact time and agitation rate were studied for the removal of the dye in a concentration of 100mg L-1. The obtained conditions were applied for various concentrations of the dye (100 – 400 mg L-1) and in all the cases, an efficiency of more than 96 % was attained. Adsorption isotherms were studied which were well in line with both Langmuir and Freundlich equations. The possibility of employing columns was studied and good results were achieved. The method was applied for the removal of dye from real samples of different waters.


HOSEIN FARAJI ,SHAHLA ELHAMI ,MEHDI TAHERI ,