Metal-doped Fe@MXene/CdS Schottky junction photocatalysts for efficient H2O2 generation and self-Fenton degradation of TC

Abstract

The integration of the Fenton reaction with photocatalysis has been recognized as an effective strategy for both energy generation and pollutant degradation. However, the conventional Fenton process necessitates the addition of hydrogen peroxide (H₂O₂), and the cycling efficiency of the Fe³⁺/Fe²⁺ conversion is constrained by pH levels. In this study, we synthesized Fe@MXene/CdS composites to facilitate the in situ generation of H₂O₂ under natural pH conditions. The combination of Fe-doped MXene and CdS initiates a self-Fenton reaction upon visible light irradiation. The unique structural properties of MXene enhance the cycling efficiency of Fe³⁺/Fe²⁺ conversion, thus improving the overall performance of the system. As a result, a highly efficient self-Fenton reaction system was successfully developed. The Fe@MXene/CdS catalyst exhibited remarkable chemical stability and photocatalytic activity. The H₂O₂ production reached 355.24 μmol/L, with a TC degradation rate of 97.20%. Experimental results indicate that the Fe@MXene/CdS catalyst possesses excellent capabilities for efficient H₂O₂ production and rapid pollutant degradation. Furthermore, its potential applications in other fields, such as antimicrobial activity, suggest new directions for future energy development and environmental protection efforts.