Magnetic composite Fe3O4/CeO2 for adsorption of azo dye

(a) Regeneration process of the MC Fe/Ce adsorbent; (b) Recycle using experiment for MC Fe/Ce. Initial concentration/volume of AB210: 50.0 mg/L/50.0 mL, MR=3. In this study, the maximum adsorption capacities of MC Fe/Ce is about 93 mg/g, which is 6 times more than that of commercial CeO2 for AB210. And the removal rate of MC Fe/Ce for AB210 is 82.3% after the first adsorption and still about 70% after the fourth adsorption experiments within 120 min. Additionally, the sample can be easily separated from aqueous solution in a few seconds under an external magnetic field.182