External mass transport processes during the adsorption of dyes onto bagasse pith

The kinetics of the adsorption of four dyestuffs onto bagasse pith has been studied. Two basic dyes, Basic Blue 69 and Basic Red 22, and two acid dyes, Acid Blue 25 and Acid Red 114, were used in an agitated batch adsorber. The effect of agitation, initial dye concentration, pith mass, pith particle size and dye solution temperature were investigated. A model is proposed to determine the external mass transfer coefficients, kf, for the systems and these are correlated with the system variable by the following equation: kf = A(variable)B.