Kinetic and Isotherm Studies on Reactive Blue 21 Dye Adsorption from Aqueous Solutions by Cac

Abstract

This work is intended to investigate the possibility of using commercial activated carbon (CAC) as an adsorbent to remove the reactive blue 21 (RB21) dye from an aqueous solution by following the batch adsorption technique at room temperature (25±1°C). The effect of adsorbеnt dosage, initial pH and contact time were studied. The results showed that increasing the CAC dosage from 0.5 to 5 g.L^-1 raised the RB21 adsorption rates from 92.16 % up to 99.99 %. The acidic condition (pH< 7) proved to be effective for RB21 adsorption studies. The adsorption process was fast, and it reached equilibrium in 2 hours of contact time.The kinetic parameters achieved at different concentrations were analyzed using a pseudo-first order, pseudo-second order and Elovich models. The experimental data fitted very well the pseudo-first order kinetic model. The experimental data were evaluatеd and fit well with the Freundlich and Temkin models. The study showed that CAC could be used as an efficient adsorbent matеrial for the adsorption of RB21 dye from aqueous solution