Development of chitosan by using a zeolite‐supported CaO derived from waste chicken eggshell to remove Acid Red 1 dye from the aqueous solution

Abstract ZSM‐5 zeolite modified with acetic acid eggshell and chitosan was impregnated in three distinct proportions. As nanocomposites (NCs), the purpose of the composites was to adsorb Acid Red 1 dye (AR‐1) from an aqueous solution. The characterization of chitosan@CaO/zeolite NCs included (CHT)1@(CaO/ZT)1, (CHT)1.5@(CaO/ZT)1, and (CHT)1@(CaO/ZT)1.5, as determined by FTIR, XRD, EDX, BET, TGA, and UV–Visible absorption spectroscopy. In a bulk system, the adsorption of the AR‐1 dye onto (CHT)1@(CaO/ZT)1.5 was analyzed in terms of solution temperature, pH, contact time, and NCs dosage. The most favorable parameters for achieving efficient dye adsorption were: a pH of 2, an adsorbent dosage of 0.05 g/25 mL of dye solution, and 20 mg/L of dye concentration at 22°C temperature. The reaction reached equilibrium after 120 min. The estimated adsorption efficiency of the AR‐1 dye by the prepared NCs is 99.70%. The mechanism by which the dye was sequestered onto (CHT)1@(CaO/ZT)1.5 was exothermic. The correlation coefficient (R2) for the pseudo‐second‐order adsorption kinetic model held true at different temperatures with a value of 0.99, indicating that the model accurately described the chemical interaction between the adsorbent and Acid Red (AR‐1). Adsorption processes are characterized as exothermic, feasible, and spontaneous when the Gibbs free energy (ΔG°) and enthalpy (ΔH°) changes have negative values, respectively. It was determined that the Langmuir model best described the isotherm behavior of AR‐1 dye adsorption onto (CHT)1@ (CaO/ZT)1.5. Under ideal conditions, the surface was found to be homogeneous and had a maximum adsorption capacity (qm) of 84.03 mg/g.