[01] Adeboye Omolara Olubunmi, Chemistry Department, Emmanuel Alayande College of Education, Oyo, Nigeria.

Adsorption of Congo red dyes on a modified leaf powder of Eleusine indica from aqueous solutions was studied. The potentials for adsorption of Congo red dye at different initial concentration were carried out (10mg/250ml, 30mg/250ml, 50mg/250ml, 70mg/250ml, and 90mg/250ml) using different mesh size. The experiments were carried out in a batch system to optimize variable: pH, contact time, concentration, and adsorbent size for the different adsorbent dosage of 250mg in 250ml of dye solution. The pH, contact time, concentration and adsorbent particle size are the major influencing factors for the adsorption process in all the experimental runs. At the end of the experiment, it was observed that the lower the size of the adsorbent the higher the adsorption of the dyes, the study also shows that the percentage adsorption of Congo red increase with time and decrease sharply with increase in the initial dye concentration but later became gradual. The result also shows that adsorption progress favourably in acidic medium.

Congo Red, Eleucine indica, Adsorption, Spectrophotometer

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