Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
10676999 | Applied Clay Science | 2005 | 6 Pages |
Abstract
Regenerated bleaching earth was used for adsorption and adsorption kinetics of the three basic dyes violet 4, violet 3 and red 9 from aqueous solution. The rate of adsorption has been investigated under various parameters such as initial dye concentration, pH and temperature. Two simple models (i.e., pseudo-second-order reaction and intra-particle diffusion) have been tested to predict the adsorption parameters. The adsorption of the basic dyes by regenerated bleaching earth at lower initial concentrations follows the order: basic violet 4>basic violet 3>basic red 9, parallel to the molecular weights and molecular sizes of the basic dyes. Further, the adsorption kinetic of the basic dyes can be well described with the pseudo-second-order reaction model. Based on the isotherm data obtained from the fittings of the adsorption kinetics, the Langmuir and Freundlich models for adsorption of basic violet 4 and basic red 9 yield relatively better fits than that for adsorption of basic violet 3.
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Authors
W.T. Tsai, Y.M. Chang, C.W. Lai, C.C. Lo,