Binary Adsorption of Reactive Red 120 and ...

Binary adsorption of Reactive Red (RR) 120 and Reactive Yellow (RY) 81 on Spirogyra majuscula was performed as function of initial dye concentration, pH regimes, and contact time. Characterization of this alga was confirmed by FTIR spectrum. Increasing initial dye concentrations caused to increase (p<0.01) in dye uptakes. Pseudo second–order kinetic model was well to describe the adsorption behavior of reactive dyes. Freundlich and Redlich–Peterson models were more suitable for the adsorption of RR 120, while for the adsorption of RY 81, Langmuir was more appropriate model. Therefore, it could be concluded that the adsorption of RR 120 could be accomplished due to heterogeneous adsorption phenomenon, whereas the adsorption of RY 81 was due to a homogeneous adsorption with monolayer surface coverage. Despite adsorption of these dyes in binary system, this alga could be used as an adsorbent for textiles wastewater treatment without adding extra cost.