TY  - JOUR
AU  - Tabbassi, Takwa
AU  - Abdedayem, Asma
AU  - Sghaier, Zohra
AU  - Hafiane, Amor
AU  - Hidouri, Mustapha
PY  - 2026
DA  - 2026/04/10
TI  - Sustainable and Environmentally Friendly Approaches for Eliminating Alizarin Red S from Contaminated Water Using Hydroxyfluorapatite-Based Biomaterials
JO  - Advances in Environmental and Engineering Research
SP  - 006
VL  - 07
IS  - 02
AB  - This study investigated the use of new bioadsorbent the Hydroxyfluorapatite (Ca10(PO4)6OH1.75F0.25, HFA) to eliminate Alizarin Red S (ARS), a harmful water pollutant. Initial batch tests were conducted to evaluate the adsorption process, focusing on both kinetics and equilibrium behavior. Various kinetic models were applied such as: pseudo first-order, pseudo second order, the intraparticular diffuision model and external diffusion model. The modeling results proved that the pseudo-second-order model best matched the experimental data. The data also suggested that both external and internal diffusion resistances significantly influenced the adsorption kinetics. Various isotherm models were also tested: Langmuir, Freundlich, Langmuir-Freundlich, Dubinin-Radushkevich, and Redlich-Peterson. The Langmuir-Freundlich model provided the closest fit to the experimental data. Thermodynamic evaluation showed that the adsorption of ARZ is favorable at low temperature; the process was non-spontaneous and exothermic. To optimize the removal process and develop a predictive model for ARS adsorption, the Box-Behnken response surface methodology (RSM) was employed. The results indicated that adsorption was most efficient at pH = 6, an adsorbent dose of 0.2, and an ARZ concentration of 195.83 at room temperature. The maximum adsorption capacity was determined to be 40.75 mg·g-1. The adsorption capacity of HAF was also proved to be effective for real wastewater treatment. Five regeneration cycles had a slight effect on HFA's adsorbent performance. Overall, the findings demonstrate that HFA is a promising material for treating wastewater containing complex pollutant mixtures, offering an effective and reliable solution for dye removal.
SN  - 2766-6190
UR  - https://doi.org/10.21926/aeer.2602006
DO  - 10.21926/aeer.2602006
ID  - Tabbassi2026
ER  -