Abstract The chitosan (Ch)—bentonite (B) composite was synthesized and its adsorption properties were investigated for lead ions. The characterization of the Ch-B composite was clarified by FT-IR, SEM, and pzc studies. Factors affecting Pb2+ ion adsorption from aqueous solution; pH, temperature, adsorbent dose, adsorbate concentration, adsorption time, and temperature were examined within the scope of the study. Adsorption was found to increase with increasing pH under acidic conditions, and the adsorbent surface was found to be positive under pH: 5.95. It was found that the adsorption isotherm was suitable for the Langmuir isotherm model and the adsorption capacity from this model was 0.425?mol kg?1. It was observed that the adsorption kinetics fit the PSO and IPD models. Thermodynamic analysis of the adsorption was made and it was determined that the adsorption process was endothermic, with increasing entropy and spontaneous. The reuse conditions of the adsorbent were investigated and it was found that the adsorbed ion was recovered 84 in 0.1?M HCl.
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