▎ 摘　　要

Graphene oxide (GO) synthesized was used as the adsorbent and had its physicochemical properties characterized by scanning electron microscope, transmission electron microscope, X-ray powder diffraction and FT-IR. These results demonstrated the complete synthezation of GO. To understand the adsorption mechanism of norfloxacin (NOR) by GO, equilibrium data were fitted to the nonlinear Langmuir, Freundlich and Sips isotherm model, the data were best suited to the Sips isotherm model. The adsorption capacities of NOR by GO under the presence of tannic acid (TA) were optimized via Box-Behnken experimental design in combination with response surface methodology (RSM) approach. Independent variables including the concentration of NOR (10-80 ppm), pH (pH 4-9) and concentration of TA (2-10 ppm) were established as a conducting base for the design of 30 experiments. The results showed that the zwitterionic form of NOR had the highest adsorption capacity (pH 6-9), which suggests it might have been caused by the hydrophobic interaction. In order to clarify adsorption mechanism, the X-ray photoelectron spectroscopy analysis was applied to examine it in detail. Therefore, these results elucidate that a combination between - electron donor-acceptor (EDA) interaction, hydrogen bonding and hydrophobic interaction was the key in the adsorption mechanism of NOR by the GO under the presence of TA.