Abstract
In this study, the biosorption capacity of Agaricus bisporus/white mushroom stump wastes was evaluated against basic (Basic Red 18), reactive (Levafix Braun E-RN) and acidic (Acid Red 111) dyes. The experiments were carried out with heat-dried and freezing-dried mushroom stump wastes (HDW and FDW). Freezing-dried mushroom stump wastes had laccase activity which showed decolourisation effect for reactive and basic dyes. FDW showed higher reactive dye biosorption capacity compared with HDW. On the other hand, acidic dye biosorption capacity of HDW proved to be considerably higher than that of FDW. Thermodynamic parameters of free energy, enthalpy and entropy obtained from biosorption reactive dye ranging from 293 to 323 K showed that the biosorption experiment was a spontaneous and endothermic process. In this study, the kinetics of the biosorption of reactive dye over mushroom stump wastes was also investigated. The investigation revealed that the process proceeds via pseudo-second-order kinetics. On the whole, this study has demonstrated that mushroom stump wastes are promising biosorbents for the decolourisation of waste water containing different kinds of dyes from textile industry.
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