“… 19 Additionally, the uptake can be attributed to the calcium content, as well as the content of SiO 2 , Al 2 O 3 , Fe 2 O 3 oxides, which ensure alkalinity in the systems, raising the pH to alkaline values, thus facilitating the uptake of ions with CFBC-FA and CFBC-S. 60 In accordance with Yasim et al , the functional groups of adsorbents could be hydrolyzed to other compounds, affecting the availability of binding sites. 61 Cheira et al reported the probable adsorption mechanism between U ions and the Ambersep 920U SO4 resin. 59 In accordance with their findings, the proposed adsorption mechanism is the complexation reaction between U ions and the quaternary amine groups.…”