4-nitrophenol usually exists in soil and groundwater, which brings great harm to the environment and human health. So, removal of 4-nitrophenol becomes the focus of research. Herein, a smart synthetic strategy of NH2-MIL-88B(Fe)@Au@COFs is proposed for the first time. NH2-MIL-88B(Fe)@Au@COFs is composed of NH2-MIL-88B(Fe) as core and COFs as shell with Au nanoparticles. Au nanoparticles in NH2-MIL-88B(Fe)@Au@COFs exhibit good dispersion and thermal stability due to amino group immobilization on NH2-MIL-88B(Fe). The core-shell structure, high thermal stability and high dispersed active sites of NH2-MIL-88B(Fe)@Au@COFs were characterized by X-ray diffraction (XRD), transmission electron microscope (TEM) and thermal gravimetric analysis (TGA), and so on. To the best of our knowledge, 4-nitrophenol was reduced to 4-aminophenol using NH2-MIL-88B(Fe)@Au@COFs as catalyst, NaBH4 as reductant and 4-nitrophenol as raw material at room temperature. The catalyst has high catalytic activity and can be used repeatedly for the reduction of 4-nitrophenol under the cooperation of Fe and Au electrons. In addition, the kinetics and mechanism of catalytic reduction was discussed in detail. Multi functional materials constructed by MOFs and COFs provide a basis for the application and expansion of new porous materials. Keywords: Au nanoparticles; Dispersed; 4-nitrophenol; NH2-MIL-88B(Fe); COFs

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