ADSORPTION OF FLUORIDE ION BY ZrO2-MAGNETIC CHITOSAN
Magnetic chitosan nanomaterials loaded by ZrO2 were prepared by high temperature hydrothermal method with ferric chloride,chitosan,zirconium oxychloride and other raw materials.The adsorption behavior of magnetic chitosan on F-was investigated.The adsorbent was characterized by XRD.The results showed that the loading of zirconia did not affect the crystalline phase and skeleton of magnetic chitosan.Adsorption experiment indicated that MCS-Zr had high removal efficiency for F-because of ion exchange and electrostatic interaction.The adsorption isotherm could be well described by the Freundlich adsorption model and the adsorption kinetic on MCS-Zr followed Pseudo-second-order kinetics.The proper increase of temperature was beneficial to the adsorption.The adsorption capacity decreased with the increase of solution pH.The coexisting ions C1-、NO3-and SO42-had no effect on adsorption.After five-time desorption regeneration,the adsorbent still had 70.33％ of the original adsorption capacity,indicating that the adsorbent had good reproducibility and could be recycled in the experimental range.
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