Bamboo charcoal (BC) was used as starting material to prepare Co-Fe binary oxideloaded adsorbent (Co-Fe-MBC) through its impregnation in Co(NO3)2,FeCl3 and HNO3 solutions simultaneously,followed by microwave heating.The low-cost composite was characterized and used as an adsorbent for Cr(Ⅵ) removal from water.The results showed that a cobalt and iron binary oxide (CoFe2O4) was uniformly formed on the BC through redox reactions.The composite exhibited higher surface area (331m2/g) than that of BC or BC loaded with Fe alone (Fe-MBC).The adsorption of Cr(Ⅵ) strongly depended on solution pH,temperature and ionic strength.The adsorption isotherms followed the Langmuir isotherm model well,and the maximum adsorption capacities for Cr(Ⅵ) at 288 K and pH 5.0 were 35.7 and 51.7 mg/g for Fe-MBC and Co-Fe-MBC,respectively.The adsorption processes were well fitted by the pseudo second-order kinetic model.Thermodynamic parameters showed that the adsorption of Cr(Ⅵ) onto both adsorbents was feasible,spontaneous,and exothermic under the studied conditions.The spent Co-Fe-MBC could be readily regenerated for reuse.