Chitosan/Sunflower Seed Husk Composite Hydrogel for the Removal of Methylene Blue from Wastewater
Chitosan hydrogels combined with sunflower husks (SFH) were prepared and used in this study to strip methylene blue (MB) dye from contaminated water. The effect of pH in the range of 2–10. Measurements of BET, pore diameter, XRD and TGA surface area were used to analyze the chitosan and sunflower peel combination surface, boosting the effectiveness of adsorption. Chitosan combined with sunflower husks had a high surface area of 17.533 m2/g and an optimal pore distribution of 2–20 nm, according to surface area study, which improved the adsorption effectiveness. When the methylene blue dye adsorption isotherms on the surface of chitosan containing sunflower husks were examined, it was found that the Freundlich isotherm's R2 value was the highest, suggesting that the dye adsorption occurred heterogeneously. The adsorption of methylene dye on the surface of the produced complex was found to be best described by the second-order kinetic model. The adsorption capacity qe, which was near the experimental value in comparison to the pseudo-first-order model, was another indication that the pseudo-second-order kinetics was the most effective at explaining the dye adsorption on the composite surface, and this conclusion was accepted based on the R2 value of the model kinetic model of the second order.