CeO2/CuBi2O4 异质结的制备及其光催化性能研究.

In this article, CuBi2O4, nanorods are prepared by hydrothermal method, and then Ce(OH)3 layer is deposited on the surface by wet chemical method and calcined to prepare CeO2 CuBi2O4 heterojunction photocatalyst. The CeO2 CuBi2O4 composite photocatalyst is characterized by X-ray diffraction (XRD ), scanning electron microscopy (SEM), X-ray p ho t0electron spectroscopy ( XPS), UV-Vis absorption spectroscopy (UV-Vis) and Mott-Schottky plot (M-S). Rhoda mine R(RhB) is used as the target pollutant to study the effect of CeO2 doping on the photocatalytic performance of CeO2 CuBi2O4 heterojunction under simulated sunlight . The results show that when 10% CeO2, is added into the composite, the degradation efficiency of RhB reaches the maximum (93.1%, 60 min), which is 30.6% higher than that of pure CuBi2O4 (71.3%, 60 min). Through free radical capture experiments, it is deter mined that the active substances that play a major role in the photocatalysis experiment are • O2- and h+. Combined with the analysis of electron band structure, it is considered that the effective separation of photogenerated electron hole- pairs under the built-in electric field of p-n heterojunction is the main reason for the improvement of photodegradation efficiency. This study provides an application of CeO2CuBi2O4-based heterojunction in photocatalysis, which is of great significance to meet the growing environmental needs in the future. [ABSTRACT FROM AUTHOR]