Constructing of Core–Satellite Structure Bimetallic MOFs for Synergistic Enhanced Adsorption–Photocatalytic Degradation

Abstract

Various industries generate a large amount of wastewater, which contains soluble organic compounds that can seriously jeopardize the environment and human health. Therefore, new photocatalytic materials with the function of efficiently degrading pollutants have become a research hotspot. In this research, bimetallic metal–organic frameworks (MOFs) with a core–satellite structure were prepared through a simple one-pot method in the presence of a polyvinylpyrrolidone structure-directing agent and crystal size. Also, the synergy of the adsorption–catalytic properties of the core–satellite structure bimetallic MOFs was achieved via the interaction of aluminum and iron groups. Meanwhile, the type I heterojunction structure based on MIL-53(Al@Fe)–OH realized the effective separation of the photogenerated carriers. Under the synergistic adsorption–catalytic degradation, the degradation efficiency of methylene blue (MB) was nearly 100% after adsorption (of 2 h) and photocatalysis (of 2 h), and the removal rate of MB still reached 90.43% after five cycles. This study provides a new strategy for the construction of bimetallic MOF structures for efficient adsorption-catalyzed degradation of environmental pollutants.