Abstract
Bi2O3/WO3 porous microspheres were constructed by the p-type Bi2O3 nanosheets firmly embedded in the n-type WO3 microspheres. These composites were systematically characterized by various analytical tools such as XRD, SEM, TEM, UV-DRS, PEC, PL and EIS. Comparing with bare Bi2O3 and WO3 samples, the modified Bi2O3/WO3 composites demonstrate superior photocatalytic efficiency for the photo-degradation of MG dye under visible-light illustration with excellent stability and repeatability, which can be ascribed to the coupling of p-n junction between the p-type Bi2O3 nanosheets and n-type WO3 microspheres, as well as the porous three-dimensional hierarchical structure. Based on the radical capturing experiments and theoretical analysis, the mechanism for the improved visible-light photocatalytic performance was proposed, which is significant for the theoretical study and application o in environmental remediation.
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