Constructing Z‐Scheme Bi2O3/In2O3 Heterojunction for Efficient Photocatalytic Degradation of Rhodamine B

Abstract

AbstractA Bi2O3/In2O3 heterojunction is successfully fabricated via a facile hydrothermal method using sodium bismuthate and indium nitrate as the source materials. The crystal structure, composition, micromorphology, and optical property of the Bi2O3/In2O3 heterojunction are analyzed by X‐ray diffraction, X‐ray photoelectron spectroscopy, Fourier transform infrared spectrum, scanning electron microscopy, transmission electron microscopy, and solid ultraviolet‐visible (UV‐vis) diffuse reflectance spectra. The Bi2O3/In2O3 heterojunction exhibits a remarkable photocatalytic degradation capacity for Rhodamine B, which is better than that of pure Bi2O3 and In2O3. The photogenerated charges separation and transfer process of the Bi2O3/In2O3 heterojunction follows a direct Z‐scheme mechanism under UV–vis light irradiation. The trapping experiment indicates that oxidative radicals including •OH, h+, and •O2− play crucial roles in the photodegradation process. The outstanding photodegradation capacity is ascribed to spatially separated charge carriers, fast‐charge transportation characteristic, and special bandgap structure of the Bi2O3/In2O3 heterojunction. The introduction of H+ and OH− ions into the reaction system promotes the formation of •OH and •O2− radicals, significantly enhancing the photodegradation rate of RhB. This study presents a new insight into the construction of the Z‐scheme Bi2O3/In2O3 heterojunction photocatalyst with potential application in wastewater treatment.