In this study, spent mushroom compost was investigated as a biosorbent for the removal of textile dyes from aqueous solution. Batch adsorption method was implemented for the study and analysis of the pH function, biosorbent amount, and contact time of the biosorption process. Biosorption kinetics followed the pseudosecond-order kinetic model for Acid Red 111 (AR111) and Basic Red 18 (BR18), whilst biosorption of Levafix Braun E-RN (LB) was well described by pseudo-first-order and intra-particle diffusion models. The biosorption process was found to be spontaneous and exothermic. The biosorption data conformed best with the Langmuir model. The maximum adsorption capacities were found as 140.9, 400.0, and 169.5 mg g À 1 for AR111, BR 18 and LB, respectively. The results showed that spent mushroom compost can be utilized as low-cost biosorbent in treating colored dye effluents.

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