A Kinetics Study of Crystal Violet and Congo red Adsorption on Cellulose and Polyester Fibers

Abstract

In this work, cellulose fibers and polyester as adsorbents for two dyes
(crystal violet and congo red) in aqueous solutions were studied with kinetic adsorptions.
The adsorption process of two dyes on cellulose fibers was reached complete equilibrium
within 30min., while the adsorption of crystal violet and congo red on polyester was
reached equilibrium after 60min. and 30min. respectively.
The maximum adsorption and the adsorption rate of crystal violet on cellulose
are much higher than that of congo red. The inverse was true for the adsorption of dyes
on polyester.
The kinetics of dyes adsorption has been studied in terms of pseudo-first order
and pseudo-second order rate expression. The results indicated that adsorption process
followed two models and demonstrated that intraparticle diffusion plays a significant role
in the adsorption mechanism.