Construction of Bi2O3/Bi28O32(SO4)10 three-dimensional microsphere heterojunction and the photoelectrocatalysis performance

Through electrodeposition and annealing, a Bi2O3/Bi28O32(SO4)(10)/FTO photoelectrode with three-dimensional spherical morphology was prepared. X-ray diffraction characterization (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), Transmission electron microscope (TEM), ultraviolet diffuse reflection spectrum (DRS), electrochemicalimpedance (EIS), photoluminescence (PL), transient state photocurrent, Mott-Schottky and other methods were carried out to characterize the elemental composition, crystal morphology and optical properties, as well as the photocatalytic performance, respectively. The results showed that the film contains Bi, O and S elements. Bi2O3/Bi28O32(SO4)(10)/FTO electrode was 10.5 times the photocurrent density of the Bi2O3/Bi28O32(SO4)(10)/FTO electrode and 2.15 times the photocatalytic degradation efficiency. Capture experiments showed that hydroxyl radicals ((OH)-O-.) and holes (h(+)) are the main reactants in the degradation process. The Bi2O3/Bi28O32(SO4)(10)/FTO composite electrode has good stability. After four degradation cycles, the removal rate of methylene blue was basically unchanged. The increase in photocatalytic activity is attributed to the increase in the visible light absorption range and the formation of heterojunction structures. Finally, the charge transfer mechanism of Bi2O3/Bi28O32(SO4)(10)/FTO was proposed.

Automated summary

A Bi2O3/Bi28O32(SO4)(10)/FTO photoelectrode with three-dimensional spherical morphology was prepared through electrodeposition and annealing. Various characterization techniques were used to analyze its composition, crystal morphology, optical properties, and photocatalytic performance. The electrode showed enhanced photocurrent density and photocatalytic degradation efficiency, mainly involving hydroxyl radicals and holes as reactants.