REMOVAL OF DYES FROM WASTEWATERS BY USING MUSHROOM PRODUCTION WASTES
Project no. 1072 · Status: Kapanmış · 2012
Summary
In this study, the adsorption capacity of mushroom wastes was evaluated against basic (Basic Red 18), reactive (Levafix Braun E-RN) and acidic (Acid Red 111) dyes. Experiments were carried out with heat-dried (HDW) and freezing-dried (FDW) mushroom wastes. FDW had laccase activity which showed decolorization effect for reactive and basic dyes. For both adsorbents, the adsorption equilibrium was best described by the Langmuir isotherm model, with maximum monolayer adsorption capacities found to be 101-119, 139- 294 and 149-185 mg /g for basic, acidic and reactive dyes, respectively. FDW showed a high reactive dye adsorption capacity compared to HDW. On the other hand, acidic dye adsorption capacity of HDW proved to be considerably higher than that of FDW. Thermodynamic parameters of free energy (?G?), enthalpy (?H?), and entropy (?S?), obtained from biosorption reactive dye ranging from 293 to 323K, showed that the adsorption experiment was a spontaneous and endothermic process. In this study, the kinetics of the adsorption of reactive dye over adsorbents was also investigated. The investigation revealed that the process proceeds via pseudo-second-order kinetics. On the whole, this study has demostrated that mushroom wastes are promising biosorbents for the decolorization of wastewater containing different kinds of dyes from textile industry.