2025/03/14 by Essoufy, M., El Ouahabi, I., Benkaddour, S. +7
paper · doi:10.48317/imist.prsm/morjchem-v13i2.52248
We prepared a natural adsorbent based on avocado seed after treatment with hexane. Our adsorbent-treated avocado seed (TAS) had an amorphous structure, the material is composed of tiny particles of different sizes, and a significant surface area of 3000 m2/g, with a pHpzc 4.7. Mathematical models for the optimization of the adsorption process of basic yellow 28 and tartrazine were developed. Starting with the full factorial design (FFD) for the determination of the factors influencing the adsorption process, followed by the optimization of these influencing parameters by the central composite design (CCD). In both processes, only the pH, the dose of the adsorbent, and the concentration of dyes were studied as influencing the adsorption according to the FFD results. The optimum conditions for the adsorption of basic yellow 28 for a better yield > 99% is 169 mg of TAS in a solution of BY 28 of concentration 24.5 mg/L at a pH of 9.95. Similarly, for a better tartrazine elimination yield of 91.11%, 350 mg of TAS was obtained in a tartrazine solution with a concentration of 10 mg/L and a pH of two. The pH, the mass of TAS, and the concentration of dyes must therefore be carefully controlled when the adsorption process is implemented.