An iron oxide, BT1, recovered from a real fluidized-bed Fenton reactor, was studied to determine its effectiveness in the adsorptive removal of strontium ions (Sr2+) from water. Millimeter-scale BT1 (0.2– 0.5 mm) mostly consisted of a poorly crystallized goethite phase (a-FeOOH), with a specific surface area of 185 m2/g. Batch jar-testing experiments were conducted at an initial Sr2+ level of 10 ppm to determine the effect of pH, the adsorption isotherms, the desorption process, and the kinetics of adsorption.