Adsorption of Congo red from Aqueous Solution using Typha australis Leaves as a Low Cost adsorbent

Abstract

The adsorption of Congo red onto Typha australis leaves as adsorbent has been investigated at batch experiments. Experimental results obtained showed that the adsorption process was dependent on adsorbent dosage, contact time, initial dye concentration and ionic strength. The adsorption kinetics was modeled by pseudo-first order (PFO) and pseudo-second order (PSO). Equilibrium isotherms were also studied. The best fittings were obtained with the PSO and Langmuir model for kinetics and equilibrium, respectively. The thermodynamic parameters have been studied, and it proved that, adsorption of Congo red using Typha australis leaves is exothermic and spontaneous. This study convinced that the naturally Typha australis leaves proved to be an alternative, attractive, effective, economic and environmentally friendly adsorbent for Congo red removal from aqueous solutions.