High concentration of fluorine ions decreased the U(VI) sorption capacity.
Fluorine doping lowered the U(VI) sorption by HAp.
The factors affected sorption of U(VI) onto HAp/FHAp were investigated.
U(VI)–F complexes did not adsorb via F atoms to the adsorbents.
The mechanism for U(VI) sorption onto HAp/FHAp has been explained.