▎ 摘　　要

In this experiment, kaolin/graphene oxide supported by nanometer zero-valent iron (GO-K-nZVI) was prepared by liquid phase reduction method. The kaolinite, graphene oxide (GO), nano-iron supported by kaolin (K-nZVI), and GO-K-nZVI was applied to remove Pb2+ ions. The microstructure and chemical composition of kaolinite, GO, K-nZVI, and GO-K-nZVI were characterized by X-ray techniques (XRD), Fourier transform infrared spectroscopy (FTIR), and Lorentz-Transmission Electron Microscope (TEM). Nanometer iron was easy to reunite and oxidize in the preparation process. Experiments showed that the support of graphene oxide/kaolin could alleviate the problem of agglomeration and oxidation. The GO-K-nZVI showed the best removal efficiency in various experimental environments (with time, pH, concentration of lead ions, and temperature). Time experiments showed that the removal efficiency of lead ions was 99% in 24 hours by GO-K-nZVI, higher than that of K-nZVI, Kaolin, and GO (91%, 33%, and 50%). The experiment results indicated that the removal efficiency of the lead ions in GO-K-nZVI and K-nZVI increased with the temperature increase, while kaolin and GO increased firstly and then decreased with the temperature increase. Most of nanometer irons in the GO-K-nZVI materials were 25 to 57 nm, and the dispersity was better than that of kaolin (K-nZVI). The removal efficiency of lead ions (Pb2+) was higher than that of kaolin load nano-iron (K-nZVI). The same content of nanometer iron in GO-K-nZVI was more efficient than K-nZVI.