▎ 摘　　要

Tetracyclines antibiotics (TAs), a veterinary drug used widely, has greatly attracted the attention due to its potential threats. We report the nanocomposites of the alpha-Fe2O3 nanoparticles growth on reduced graphene oxide (RGO) by a one-pot method. The adsorptive amounts (216.2 mg g(-1) for chlortetracycline, 180.8 mg g(-1) for tetracycline and 98.4 mg g(-1) for oxytetracycline) of the alpha-Fe2O3 @RGO nanocomposites was mainly correlated with the increasement of the uniform and well-dispersed alpha-Fe2O3 nanoparticles on RGO. The relatively low adsorptive amount of oxytetracycline is due to the synergetic effect of its relatively weak interactions with RGO and relatively slack complexation with alpha-Fe2O3, which also provides an experimental proof for the theoretical prediction previously reported. The TAs adsorption by the alpha-Fe2O3 @RGO nanocomposites is achieved for 20 min and strongly pH-dependent due to the enhanced repulsive interaction at low or high pH. The TAs adsorptions fitted well the Langmuir and the pseudo-second-order equations. (C) 2020 Elsevier B.V. All rights reserved.