Tunable Photocatalytic Properties of Au-Decorated BiFeO3 Nanostructures for Dye Photodegradation

• Published in: ACS applied nano materials Vol. 7; no. 8; pp. 9777 - 9788
• Main Authors: Wu, Jhen-Yang, Chen, Chun-Yi, Wang, Junan, Jin, Xinyu, Hou, Wending, Kuo, Hsuan-Hung, Chiu, Wan-Ting, Kurioka, Tomoyuki, Sone, Masato, Okamoto, Satoshi, Hsu, Yung-Jung, Chang, Tso-Fu Mark
• Format: Journal Article
• Language: English
• Published: American Chemical Society 26.04.2024
• Subjects: Au nanoparticle; BiFeO3; photodegradation; time-resolved photoluminescence spectroscopy; charge transfer
• ISSN: 2574-0970; 2574-0970
• DOI: 10.1021/acsanm.4c01702

This study presents the synthesis and characterization of Au nanoparticle-decorated BiFeO3 (Au-BiFeO3) nanocrystals fabricated by a hydrothermal technique. The key focus is the augmented photocatalytic properties of these nanocrystals for the effective photodegradation of methylene blue (MB), a common industrial dye. The magnetic properties of the Au-BiFeO3 merely differ from those of the BiFeO3. The decoration of Au nanoparticles onto the BiFeO3 introduces heterojunction structures that lead to effective charge-carrier separation under illumination. Time-resolved photoluminescence spectroscopy confirms the enhanced charge separation and reduced recombination rate in Au-BiFeO3 nanocrystals. Through meticulous optimization, the photocatalytic performance of these nanocomposites was evaluated under various Au loadings, revealing that 1.0 wt % Au-BiFeO3 exhibits the most superior activity, achieving an impressive 98% degradation efficiency of MB under a 500 W xenon lamp within 120 min. The study also demonstrates the structural integrity and stability of the photocatalyst, with it retaining about 80% of its original activity after four cycles of the 120 min photodegradation process. These findings suggest that the Au-BiFeO3 nanocrystals are promising, efficient, and sustainable photocatalysts for environmental purification and offer insights into designing advanced materials for solar energy utilization.