Introduction: Due to rapid industrialization and urbanization, abundant industrial effluents are discharged into the environment. Concerns have been raised on dye manufacturing and textile industries due to the detrimental effects of effluents containing dye discharged. Hence, this study aims to examine the adsorption of a common synthetic dye using Agaricales (Gilled Mushrooms) as biosorbents. Method: Among the
5 species of Agaricales cultivated in the screening experiment, Pleurotus ostreatus (Oyster Mushroom) and Pleurotus eryngii (King Oyster Mushroom) were found to have relatively higher growth rates of 86.17% and 77.97% respectively. Pleurotus ostreatus was selected for recultivation with addition of 50 ppm of Remazol Brilliant Blue R dye to examine its ability to remove the dye. Pleurotus ostreatus showed rapid decolorizing ability within 3 days of cultivation with Ramazol Brilliant Blue R. Therefore, batch analysis was subsequently conducted by varying the experimental parameters. Results: AFrom the batch analysis, Pleurotus ostreatus achieved the highest dye decolorization in cultivation medium of pH 2, 0.1 mL surfactant, 0 mg/L of sodium chloride and with 8 plugs of biosorbent. Adsorption isotherm studies were also conducted. The adsorption data fitted Jovanovic isotherm the most with highest R2 value of 0.9949 compared to Langmuir, Freundlich and Harkin-Jura isotherms. Conclusion: This study shows the potential of Agaricales, particularly Pleurotus ostreatus as biosorbent of synthetic dye due to its high growth rate and efficiency of synthetic dye removal.