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Abstract
The adsorption of crystal violet from textile waste water onto carbon produced from sawdust that was activated by phosphoric acid and potassium hydroxide was an experiment that was carried out under room temperature. Adsorption is a separation process where the molecules of a solute in an aqueous solution are adsorbed to the surface of another molecule. The materials used for this experiment are phosphoric acid, potassium hydroxide, crystal violet dye, distilled water and activated carbon made from sawdust. In order to obtain the aim of the experiment, different experiment were performed which are; effect of initial concentration, effect of adsorbent dosage, effect of contact time, effect of temperature and adsorption isotherms were studied in order to find out the activating agent which best fit for the removal of the crystal violet. The percentage removal of the crystal violet was calculated to be 86.03% and 86.50% for the basic and acidic activating agents respectively for the adsorbent dosage experiment. Also, the determination coefficient value, R2 for the acid treated sawdust activated carbon for Langmuir isotherms was 0.9992, maximum adsorption capacity, QO was 29.1545mg/g and the dimensionless separation parameters, RL was found to be favorable with value 0.0448. In conclusion, the acid activated carbon was found to be more effective in the removal of crystal violet when compared to the alkaline activated carbon since its R2 value is higher.
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