Abstract
The adsorption of Congo red (CR) from aqueous solution using treated ground cranberry stem by varying the parameters such as contact time, dye concentration, adsorbent dose, pH and temperature was investigated. Adsorption isotherms of CR onto CS were analyzed by Langmuir and Freundlich. It was observed that the optimum CR adsorption onto ground CS occurred at contact time of 30 minutes, the adsorbent dosage of 8 g, initial concentration of 50 mg/L and pH 2. In addition, the particle size of ground CS has no significant effect on the adsorption of CR. Adsorption isotherms studied through the use of graphical methods revealed that the adsorption of CR onto cranberry stem follows both Langmuir and Freundlich models, with the maximum adsorption capacity was 95.25mg g-1. The ground cranberry stem investigated in this study thus exhibited as a high potential adsorbent for the removal of CR from aqueous solution.
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