Kinetics of color removal by adsorption from water using activated clay

Kinetics and mechanism of adsorption of one commercial basic dye (BB69) and one direct dye (DR227) from aqueous solutions using clay were studied in t he temperature range 15 similar to 75 degreesC. The clay was activated by t reatment with sulfuric acid. Two simplified kinetic models, pseudo first- a nd second-order equations, were tested. it was shown that the adsorption of both dyes could be well described by the pseudo second-order equation Rate constants of the best-fit model were calculated, and the related apparent activation energies wee also evaluated and discussed.