Lv et al. [L. Lv, J. He, M. Wei, D.G. Evans, X. Duan, Factors influencing the removal of fluoride from aqueous solution by calcined Mg-Al-CO3 layered double hydroxides, J. Hazard. Mater. B 133 (2006) 119-128] previously investigated the fluoride removal using calcined Mg-Al-CO3 layered double hydroxides (CLDH) as the sorbents. The present comment further discusses the mechanism of fluoride adsorption onto CLDH.