▎ 摘　　要

Microspheric NiFeCu layered double hydroxide/graphene oxide (NiFeCu-LDH/GO) composites were prepared by one-pot hydrothermal method. Scanning electron microscopy showed that NiFeCu-LDH/GO was a porous microspheric structure. Nitrogen adsorption-desorption analysis showed that the addition of GO increased the specific surface area of NiFeCu-LDH from 34.61 to 113.64 m2/g. The adsorption properties of Congo red by NiFeCu-LDH, NiFeCu-LDH/GO, GO and commercial activated carbon were studied. The results showed that the adsorption capacity of NiFeCu-LDH/GO is obviously better than that of the other three materials, when the temperature is 298.15 K and pH is 4, according to the Langmuir adsorption isothermal model, the theoretical maximum adsorption capacity is 867.67 mg/g, which was much larger than the maximum adsorption capacity of GONiFe-LDH composite for Congo red (421.35 mg/g). The kinetic and thermodynamic studies showed that the adsorption process of NiFeCu-LDH/GO composite for Congo red corresponded to the pseudo-second-order kinetic model and the Langmuir isothermal model, and the adsorption performance remained good after being reused for four times. These results indicated that the NiFeCu-LDH/GO composite had a strong potential for mitigating Congo red dye in wastewater.