| Summary: | A new composite adsorbent of magnetic chitosan-benzoin/fly ash (Cn-Bn-FSH-Fe3O4) was developed for removal of anionic organic dye (Reactive blue 19: RB19) from aqueous medium. To ascertain the physicochemical characteristics of Cn-Bn-FSH-Fe3O4, BET, SEM-EDX, FTIR, XRD, and pHpzc test were used. The experimental data was simulated via RSM-BBD to pinpoint the influence of adsorption factors precisely. Laboratory results, including the RSM model outcomes evidenced that the highest RB19 elimination value (97.95 %) was achieved when using Cn-Bn-FSH-Fe3O4 of 0.1 g, solution pH of 4, temperature of 45 °C, and a span time of 32.5 min. The adsorption data were well described by the pseudo-second-order kinetic and Freundlich isotherm models, the monolayer adsorption capacity for RB19 was found to be 309.6 mg/g. The thermodynamic parameters indicated that this adsorption system was endothermic in nature. Thus, this study reaffirms the applicability of the Cn-Bn-FSH-Fe3O4 as promising adsorbent for toxic textile dye removal. © 2024 Elsevier B.V.
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