Ti3C2 MXene/NH2-MIL-88B(Fe): Research on the adsorption kinetics and photocatalytic performance of an efficient integrated photocatalytic adsorbent

Highlights: • The new Schottky junction photocatalyst Ti₃C₂ MXene/NH2-MIL-88B was prepared by solvothermal method. • The adsorption capacity of the composite material is more than 4 times that of the monomer material. • The photocatalytic rate of 10 mg composite materials is more than 6 times that of monomer materials on 50 ppm MB. • The composite material has adsorption photocatalytic degradation effect on a variety of dyes. Ti₃C₂ MXene contains suitable elements that are effective for photocatalysis, but it is usually not directly used for photocatalysis, which hinders its application in photocatalytic water treatment. In this work, we used the solvothermal method to grow MOF (Fe) in situ on Ti₃C₂ MXene to construct a composite schottky photocatalytic adsorbent. The morphology of the material is characterized by XRD, SEM, XPS, etc. The adsorption kinetic model and photocatalytic performance of the material were studied. The introduction of MXene avoids the agglomeration of MOF, increases the effective area of the composite material, and acts as a photo-generated electron trap in the photocatalytic process to enhance the charge separation efficiency of MOF. 10 mg composite material can remove more than 90% of MB (50 ppm) within 30 min, and remove 83.41% RhB (25 ppm) and 44.26% MO (20 ppm) within 120 min. In the case of a small amount of use, it shows good adsorption and photodegradation properties to a variety of dyes. Based on the experimental results, a dye removal mechanism based on adsorption performance and schottky knot synergistic Fenton effect is proposed. Its application can be used to eliminate and degrade pollutants in water.