Preparation and Characterization of Novel Magnetic ZnFe2O4–Hydroxyapatite Core–Shell Nanocomposite and Its Use as Fixed Bed Column System for Removal of Oil Residue in Oily Wastewater Samples

摘要: Abstract Using magnetic nanoparticles to remove the dispersed oil from produced water is a promising way overcome difficulties faced by current treatment technologies. Therefore, in this study, novel ZnFe2O4-hydroxyapatite core-shell nanocomposites (ZFHA) was prepared precipitation method and investigated as an adsorbent residual wastewater. The ZFHA were studied FTIR, X-ray diffraction, HRTEM, SAED, EDX. results revealed that hydroxyapatite coated on ZnFe2O4 surface formed structure. effect of various parameters adsorption process like bed height (59, 118 178 mm), flow rate (1, 3 5 mL min−1), temperature 25–77 °C, initial concentration (100, 500, 1000 10,000 ppm) pH (2–10) investigated. experimental data showed with increased column depth 59 178 mm, breakpoint time (tb) 30 48 min. highest equilibrium capacity at optimum conditions (77 °C, 10,000 ppm, 3 mL/min 178 mm) estimated be 3500 mg L−1. contact decreased increase rate. Adsorption kinetic evaluated fixed column. Finally, regeneration exhausted assessed; which satisfactory for three times reusability after saturation. Therefore; could applied effectively synthesis oily wastewater samples Egyptian fields petroleum industry.