*2.6. Desorption and Reusability*

The recycle adsorption experiment was tested with 7 successive cycles of dynamic adsorption of Cr(VI). After each cycle, 100 mL 1 M NaOH served as the desorption solution and flowed through the column with 0.3 g adsorbent at flow velocity of 56.84 μL min<sup>−</sup>1. After being washed by deionized water to neutrality, the adsorbent was freeze-dried for the next cycle.
