the adsorption rate of metal uptake was very fast and the maximum uptake was observed within 6–10 min.
There was almost no further increase of adsorption after 10 min.
These results showed that the actual adsorption of metal ion binding to the adsorbent was very rapid.
Data on the adsorption rates of Cr(VI) ions by various modified chitosan have shown a wide range of adsorption times.