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A Fe3O4/HNTs composite was synthesized, characterized by SEM, TEM, XPS, adsorption–desorption N2, XRD, FTIR, VSM and Zeta potential, and was used for an ibuprofen adsorption and Fenton oxidation study. The response surface methodology (RSM) and Box–Behnken experimental designs were employed. The effects of pH, contact time, ibuprofen concentration, and Fe3O4/HNTs dosage on ibuprofen adsorption were evaluated. Additionally, adsorption isotherms and a kinetic study were performed. The effects of pH, H2O2 concentration, and Fe3O4/HNTs dosage for IBU removal were also studied. The results of ibuprofen adsorption on Fe3O4/HNTs indicate that adsorption was favored at acidic pH. The adsorption followed pseudo-second-order kinetics and a Freundlich isotherm. Under mild conditions (pH 7, 298.15 K) with a Fe3O4/HNTs dosage of 1.5 g L−1 and 0.5 M H2O2, the heterogeneous Fenton-like reaction achieved 99% ibuprofen removal and 60% mineralization. The Fe3O4/HNTs catalyst demonstrated high efficiency for aqueous ibuprofen removal under environmentally mild pH and temperature conditions, and it was easily recoverable and reusable.
García-García et al. (Fri,) studied this question.