▎ 摘　　要

Considerable attention has been paid to water treatment using nanomaterials. In this study, ethylene glycol (EG) is used to control the formation of alpha-FeOOH/reduced graphene oxide (RGO) hydrogels in a facile way. The EG-promoted alpha-FeOOH/RGO hydrogels exhibit higher moisture content, more porous structure, lower agglomeration, larger swelling, higher specific area, more defects in graphene sheets, stronger Fe-O-C bonds, and higher roughness than those without modification. More importantly and interestingly, we found for the first time that the alpha-FeOOH/RGO hydrogels could generate reactive oxygen species (ROS) without the addition of H2O2, and this property is also enhanced in EG-promoted hydrogels due to (i) the increase in defects in graphene sheets leading to enhanced oxygen reduction reaction (ORR) and (ii) the strengthening of Fe-O-C bonds relating to dual reaction centers with stronger generation of (OH)-O-center dot. In tetracycline degradation from water, the increase in electron density disparity in the material and the promoted role of tetracycline as an electron donor are proved to be the main reasons for the enhanced tetracycline removal from aqueous solution. Results obtained through density functional theory (DFT) indicate that the electrons could be transferred from the N area in tetracycline to the Fe area in the material, based on which we found a special pi-pi interaction (between tetracycline and graphene) coupled with pi-Fe interactions (between graphene and alpha-FeOOH) as an efficient pollutant removal method. Our findings provide a simple strategy for the structure improvement of environmental nanomaterials and enrich their mechanism studies.