Abstract
Adsorption feasibility of crystal violet dye (CV+) onto acid-activated bentonite clay, entrapped in a polymeric matrix of calcium alginate bead examined in this work. Operational parameters have been investigated, isotherms were analyzed using non-linear regression model and data obtained optimized by Box–Behnken model. Pseudo-nth order fits well with the kinetic data obtained, and the reaction order n was found to be between 0.925 and 3.269. Desorption tests showed that the recovery of CV+ decreased from 92.39 to 84.59% in the tenth cycle. The maximum adsorptions of crystal violet onto alginate/acid activated bentonite beads (A-AAB), alginate/bentonite beads (AB), and acid activated bentonite clay (AAB) were 582.4, 498.2 and 229mgdyeg−1 respectively. The thermodynamic parameters indicate that the adsorption process of CV+ is endothermic and more effective at high temperatures.
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