Abstract
In this study, Fe3O4-HA-La composite was prepared by chemical coprecipitaion method, and the oxytetracycline (OTC) adsorption efficiency of the obtained adsorbent was investigated with batch experiment. Characterization methods, including BET, SEM, XRD, FTIR, XPS and VSM, were employed to study its physiochemical properties. The batch experiment results indicated that > 90 % of OTC was removed using the adsorbent Fe3O4-HA-La under wide pH range from 5–9. The regeneration experiment showed that after three cycles of adsorption/regeneration, Fe3O4-HA-La kept the OTC removal efficiency > 80 % and saturation magnetization (Ms) value > 55 emg g−1. The OTC adsorption process was better fitted with pseudo-second-order kinetic model. The OTC adsorption process was better fitted with Redlich-Peterson model (R2 > 0.99). High correlation coefficient (R2 > 0.97) was also observed for Langmuir model, which showed the Qmax of 23.43 mg g−1. The complexation reaction between OTC and HA, La and Fe on Fe3O4-HA-La were contributed to the efficient removal of OTC by Fe3O4-HA-La.
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