Magnetic supported activated carbon obtained from walnut shells for bisphenol-a uptake from aqueous solution

Abstract This work investigated the usability of activated carbon walnut shell (ACWS) and magnetic (MACWS) for Bisphenol-A (BPA) elimination from aqueous solution. Fourier-transform infrared (FT-IR) X-ray diffraction (XRD) were used to study chemistry adsorbents. Batch sorption studies at different temperatures, contact time, adsorbent dosage, pH varied concentrations performed, while pseudo-first-order pseudo-second-order kinetics models deployed investigate kinetic data. Equilibrium parameters computed using Dubinin–Radushkevich, Freundlich, Temkin Langmuir isotherms, Box–Behnken design was optimize adsorption factors. FT-IR report showed existence O–H, C=O, C–O C=C stretches in both adsorbents Fe–O MACWS, XRD revealed an amorphous morphology. BPA removal by ACWS MACWS with correlation coefficient (R 2 ) > 0.9 that model most appropriate explaining Judging values maximum capacity (115.85 166.67 mg/g respectively), it can be inferred isotherm best describes equilibrium results. Thermodynamic investigation process uptake spontaneous endothermic entropy change (?S o 0.033 0.039 kJ/mol respectively. The data obtained kinetics, effective treatment Bisphenol-A.