Effect of Ag Doping on the Photocatalytic Performance of Bismuth Ferrite-based Compounds
Received date: 2024-12-04
Online published: 2025-02-14
Supported by
Youth Science and Technology Talents Support Project of Inner Mongolia Autonomous Region(NJYT23002); Science Project of Inner Mongolia University of Technology(ZY201807)
Bismuth ferrite-based compounds, such as BiFeO3 and Bi2Fe4O9, have attracted significant attention as photocatalytic materials due to their favorable structural properties and stability. In this study, Ag-doped BiFeO3 and Bi2Fe4O9 powders were synthesized using the sol-gel method, and their photocatalytic properties were evaluated through the degradation of Rhodamine B (RhB) under ultraviolet (UV) light. The results showed that Ag doping notably enhanced the photocatalytic properties of Bi2Fe4O9. Specifically, 3 mol% Ag-doped Bi2Fe4O9 exhibited an impressive RhB degradation rate of 96%, indicating its high efficiency for photocatalytic applications. In contrast, Ag doping in BiFeO3 led to the formation of mixed phases, including Bi2Fe4O9 and Bi25FeO40, and resulted in only a modest improvement in photocatalytic performance, with a RhB degradation rate of 50%. These findings highlight the superior photocatalytic activity of Bi2Fe4O9 compared to BiFeO3, emphasizing the importance of material composition and doping concentration in optimizing photocatalytic efficiency. Moreover, UV-Vis diffuse reflectance spectroscopy was used to investigate the electronic properties of the materials. The analysis revealed that Bi2Fe4O9 exhibits a dual-bandgap feature with values of 1.28 eV and 1.36 eV, which enhances the material's ability to absorb visible light and improves its photocatalytic performance under ambient light conditions. To explore the mechanisms behind these improvements, density functional theory (DFT) calculations were conducted. The results indicate that the Ag 4d orbitals introduce defect energy levels near the valence band maximum of Bi2Fe4O9, effectively narrowing the bandgap. This facilitates more efficient charge separation, which is crucial for enhancing photocatalytic properties. Fluorescence spectroscopy further confirmed that Ag doping effectively inhibits the recombination of photogenerated electron-hole pairs, further boosting the photocatalytic efficiency of Bi2Fe4O9. This study provides valuable insights into the potential of Ag-doped bismuth ferrite-based compounds for advanced photocatalysis, and pave the way for the development of efficient photocatalysts for environmental and energy-related applications, such as water purification and solar energy conversion.
Key words： Bismuth ferrite; photocatalysis; doping; first-principles; defect energy levels
Guowei Hu , Xiaohuan Wang , Zhipeng Yuan , Yaer Xinba , Hexige Wuliji . Effect of Ag Doping on the Photocatalytic Performance of Bismuth Ferrite-based Compounds[J]. Acta Chimica Sinica, 2025 , 83(3) : 229 -236 . DOI: 10.6023/A24120364
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