The construction of a Fenton system to achieve in situ H2O2 generation and decomposition for enhanced photocatalytic performance

Abstract

In this study, Ni_xFe_yO₄–BiOBr (NFB) composites with different etching degrees were successfully synthesized via a simple hydrothermal method. The etching degree was regulated by adjusting the pH during the synthesis process. The superiorities of the obtained materials can be outlined as follows: (i) BiOBr has the property of generating H₂O₂in situ; and (ii) Ni_xFe_yO₄ nanoparticles in the composite could effectively promote the decomposition of H₂O₂, which proceeded via the two-electron reduction of O₂ on the surface of BiOBr. The excellent properties of the prepared materials were confirmed through the photocatalytic degradation of bisphenol A under visible light irradiation, which is denoted as a solid–liquid-interfacial Fenton system. This work may pave the way for in situ H₂O₂ generation and decomposition; thus, the defects of traditional Fenton reaction systems, such as strict reaction conditions, high costs and secondary contamination after reactions, can be intelligently overcome.