Removal of a textile dye by adsorption on synthetic calcium phosphates

► An efficient and environmental friendly sorbent is synthetic calcium phosphates. ► The study of synthetic phosphates and their adsorption properties towards textile dye. ► The maximum adsorption capacity decreased when the temperature was increased. ► The kinetic study shows that equilibrium is quickly for both phosphates. ► The adsorption phenomenon was a spontaneous, exothermic and physical process.