▎ 摘　　要

Removing organic dyes from wastewater is an important task of environmental remediation. In this work, a nano composite alpha-Fe2O3/graphene oxide (alpha-Fe2O3/GO) was fabricated with a facile hydrothermal process. The as fabricated alpha-Fe2O3/GO was characterized and tested as adsorbent for removing two typical ionic dyes Congo red (CR) and methyl violet (MV) from aqueous solutions. The interaction mechanisms of alpha-Fe2O3/GO with CR and MV were analyzed. Findings presents, synergistic effect between alpha-Fe2O3 and GO made alpha-Fe2O3/GO outperform either alpha-Fe2O3 or GO. alpha-Fe2O3/GO exhibited high adsorption capacity and cycling performance, most importantly, ultrafast adsorption kinetics especially on MV. Adsorptions of CR and MV equilibrated in 8 min and 5 min, the corresponding adsorption percent/quantity were 95.78%/239.45 mgg(-1) and 99.907%/1998.14 mgg(-1), respectively. The good adsorption performance of alpha-Fe2O3/GO originated from its thin morphology, abundant oxygen containing groups, as well as strong chemical interaction with CR and MV. The adsorptions were thermodynamically spontaneous and endothermic, while kinetically controlled by surface reaction. Hydrogen bond and pi-pi interaction was the primary interaction mechanism between adsorbate and adsorbent. The merits including simple fabrication and superior adsorption performance may endow alpha-Fe2O3/GO promising application in removing organic dyes.