This study focuses on the potential use of apatitic materials grafted with aminotrimethylene phosphonic acid (HAp-AMP) at different grafting rates (0%, 2.5%, 5%, and 10%) as basic yellow dye adsorbents 28. These apatitic materials were prepared by a precipitation process at 25 °C in an aqueous medium according to the rapid neutralization of calcium hydroxide (Ca(OH)₂) by ammonium dihydrogen phosphate (NH₄H₂PO₄). The synthesized materials were characterized by various analytical techniques to determine physicochemical properties such as XRD, FTIR, BET, respectively. Design-of-experiments study of the adsorption process of basic yellow dye 28 on the synthesized powder with the highest adsorbed dye content. For this we chose the material (HAp-AMP 10%) as a representative model. This study was carried out by applying a factorial design using Design-Expert software to distinguish among three factors (concentrations of basic yellow 28, contact time between adsorbent and adsorbate, and pH) those currently considered to be potentially influential. The results show that the adsorption capacity of adsorbent towards the cationic dye was 31.38 mg/g obtained at 298 K with an initial concentration of 75 mg/L, a contact time of 67 min and while pH had no significant impact on adsorption compared to the other parameters.

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