Abstract
The adsorption of acid dyestuffs in solution onto maize cob has been investigated. Equilibrium isotherms have been determined for the adsopriton of Acid Blue 25 (AB 25) and Acid Red 114 (AR 114) onto maize cob. The L-shaped adsorption isotherms suggest that adsorption proceeds through ionic bonding and that the dye molecules are adsorbed in a flatwise manner on the surface of the maize cob particles. The maximum adsorption capacity of the maize cob was found to be 47.7 and 41.4 mg dye per g maize cob for AR 114 and AB 25, respectively.
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