The development of the textile industry significantly impacts the country’s economy, but also the untreated wastewater from this industry contributes to water pollution. Unfortunately, dyes used in the textile industry are accepted as the major pollutants for the aquatic environment. The inexpensive treatment technologies for textile effluents continuously save their importance to prevent water pollution. It is aimed to investigate the potential of biosorbents obtained from pistachio shells, which were wastes of agricultural products, modified with surfactants to treat the dye-containing solutions in this study. Biological waste material was modified with surfactants to enhance biosorption and the effects of parameters such as pH, contact time, and surfactant concentration were determined. The cationic surfactant Hexadecyltrimethylammonium bromide (CTAB) modified waste pistachio shells removed 95.92% of textile dye Remazol Black B (RBB) after 360 minutes, while the unmodified shells removed a maximum of 64.76% of the same dye after 1440 minutes. Also, the biosorption isotherm and kinetic models were used to clarify the biosorption mechanism. It is concluded that surfactants can be utilized to augment the decolorization capacity of easily available, low-cost, and eco-friendly waste biosorbents for the treatment of textile dye-contaminated water.

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