Activated carbon prepared from Eichornia Crassipes as an adsorbent for the removal of dyes from aqueous solution

摘要

The ability of the activated carbon prepared from Eichornia Crassipes to remove Reactive Magenta B and Reactive Turquoise Blue dyes from aqueous solution has been carried out as a function of contact time, dose (0.1-0.60 mg/50 ml for Magenta B and 0.25-2.0 mg/50ml for Turquoise Blue), pH (2-10) and concentration (25, 50, 75, 100mg L-1). An amount of 0.6 g of the adsorbent could remove 56.0% of the dye from 100mgL-1 Magenta B dye solution and 2.0 g could remove 45.87% of Turquoise Blue dye from 100 mgL-1 Turquoise Blue dye solution. The amount of dye adsorbed per unit weight of the adsorbent increased from 15.64 to 56.01 mgg-1 with increasing concentration from 25 to 100 mgL-1. The kinetics of adsorption was discussed in view of the kinetic models, the pseudo-first-order Lagergren model, Langmuir, Freundlich, Tempkin, Harkins jura Elovich and the pseudo-second-order model.