DOI: 10.36347/sjet

Pages: 311-318

The aim of this study is to evaluate adsorption kinetics, isotherms parameters of Reactive blue 59 (RB-59) onto Azolla filiculoides from aqueous solutions. The effects of pH, contact time, initial dye concentration and dose adsorbent were investigated in the experimentally. The percentage of color removal decreased with increase in initial dye concentration. Adsorption equilibrium of color removal was reached after 75 min of contact time. Equilibrium data were fitted to Langmuir, Freundlich, and Tempkin isotherms, and their constants were determined. Using the linear correlation coefficients showed that the Langmuir isotherm best fits the RB-59 adsorption data on biomass. The experimental data were fitted into the following kinetic models: pseudo-first-order, pseudo-second-order, and the intraparticle diffusion model. It was observed that the pseudo-second-order kinetic model described the adsorption process better than any other kinetic models. The results obtained indicate that Azolla filiculoides could be employed as a much more efficient adsorbent for dye removal from aqueous solution