▎ 摘　　要

In this study, the nanocomposite of gamma-Fe2O3 and reduced-graphene oxide (RGO) with 10% wt RGO was synthesized via the combination of the modified Hummers and co-precipitation methods. The structural properties of the gamma-GFO powder and tablet were characterized through X-ray diffraction analysis, field-scanning electron microscopy, Brunauer-Emmett-Teller analysis, Raman spectroscopy, and Fourier transform infrared spectroscopy. After undergoing heat treatment at 120 degrees C, the tablet exhibited a nanoporous structure with an S-BET of 94.5 m(2)/g, which was slightly higher than the S-BET of the powder sample. Batch and fixed-bed column studies were conducted to evaluate the performance of gamma-GFO in the removal of heavy metals from aqueous solutions. Results showed that the RGO/gamma-Fe2O3 (gamma-GFO) tablet showed an individual adsorption efficiency of 99.7% for As (V) after 45 min and good simultaneous adsorption capacity for the five heavy metals As, Pb, Cr, Fe, and Mn. These results suggested that gamma-GFO is very promising for applications in adsorbing heavy metals in borehole water filters.