Synthesis and Peroxide Activation Mechanism of Bimetallic MOF for Water Contaminant Degradation: A Review

Abstract

Metal–organic framework (MOF) materials possess a large specific surface area, high porosity, and atomically dispersed metal active sites, which confer excellent catalytic performance as peroxide (peroxodisulfate (PDS), peroxomonosulfate (PMS), and hydrogen peroxide (H2O2)) activation catalysts. However, the limited electron transfer characteristics and chemical stability of traditional monometallic MOFs restrict their catalytic performance and large-scale application in advanced oxidation reactions. Furthermore, the single-metal active site and uniform charge density distribution of monometallic MOFs result in a fixed activation reaction path of peroxide in the Fenton-like reaction process. To address these limitations, bimetallic MOFs have been developed to improve catalytic activity, stability, and reaction controllability in peroxide activation reactions. Compared with monometallic MOFs, bimetallic MOFs enhance the active site of the material, promote internal electron transfer, and even alter the activation path through the synergistic effect of bimetals. In this review, we systematically summarize the preparation methods of bimetallic MOFs and the mechanism of activating different peroxide systems. Moreover, we discuss the reaction factors that affect the process of peroxide activation. This report aims to expand the understanding of bimetallic MOF synthesis and their catalytic mechanisms in advanced oxidation processes.

Enhancing dye degradation using a novel cobalt metal–organic framework as a peroxymonosulfate activator

“…Advanced oxidation processes (AOPs) based on sulfate treatments have emerged as effective methods to remove pollutants from wastewater. 4,5 Owing to its asymmetric molecular structure and shorter O–O bond length, peroxymonosulfate (PMS, SO 5 2− ) is easier to activate than peroxydisulfate (PDS, S 2 O 8 2− ) and can generate a range of highly reactive substances, such as hydroxyl radicals (HO˙), sulfate radicals (SO 4 ˙ − ), superoxide radicals (O 2 ˙ − ) and singlet oxygen ( 1 O 2 ). 6–8 In addition, PMS offers several advantages for pollutant degradation, including high solubility, convenient transportation, and the ability to generate active substances over a broad pH range, leading to economic benefits.…”

Sustainable conversion of polyethylene plastic bottles into terephthalic acid, synthesis of coated MIL-101 metal–organic framework and catalytic degradation of pollutant dyes

“…Also, various metal–organic frameworks (MOFs) have been explored for catalyzing the oxidation of organic pollutants, activated by compounds like PDS, PMS, or H 2 O 2 . Bimetallic MOFs surpass single-metal ones, improving oxidation efficiency, catalytic activity, stability, and control in peroxide activation 14 , 15 .…”

Advantages of Bimetallic Organic Frameworks in the Adsorption, Catalysis and Detection for Water Contaminants

“…Based on the advantages mentioned above, many studies have reported binary metal MOF-based nanomaterials with different compositions and structural properties that are widely used in environmental pollution control [24][25][26]. Fan et al [27] focused on the synthesis of bimetallic MOFs and catalytic degradation of water pollutants and further summarized in detail the influencing factors and catalytic mechanism of this material in the activation processes for peroxydisulfate (PDS), peroxymonosulfate (PMS), and peroxide (H 2 O 2 ). Soni et al [24] reported the latest developments in the synthesis and electrocatalytic activity of two-dimensional MOFs with bimetallic nodes.…”