Biosorption of Basic Blue 41 from aqueous solutions by Posidonia oceanica: Application of two-parameter and three-parameter isotherm models

AbstractBatch biosorption experiments were carried out for the removal of basic dye, Basic Blue 41, from aqueous solution using marine biomass Posidonia oceanica. A series of assays were undertaken to assess the effect of the systems variables (solution pH, biomass amount, and dye concentration). The highest dye removal yield was achieved at pH 8–11 (i.e., maximum adsorption capacity of 225.48 mg g−1). The minimum sorbent concentration experimentally found to be sufficient to reach the total removal of dye molecules from aqueous solution was 0.4 g L−1. The equilibrium biosorption isotherms and kinetics were investigated. The equilibrium data were fitted using three two-parameter models (Langmuir, Freundlich, and Temkin) and two three-parameter models (Sips and Toth). Langmuir and Sips equations provided the best model for BB41 biosorption data. Kinetic studies indicated that the kinetics of the biosorption of BB41 onto P. oceanica follows a pseudo-second-order model. In addition, an exhaustive comparative...