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Internal-Field-Oriented BrO3-/IO3- Solid-Solution Engineering of BiOIO3 for Efficient Photocatalytic Water Purification
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DOI：10.1016/j.psep.2026.109432.png)
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Abstract
En 中文
Regulation of the polarization-generating units offers an attractive opportunity to promote charge separation in polar BiOIO3 photocatalysts. Herein, BrO3-/IO3- solid-solution engineering was developed to modulate XO3- (X = I/Br) polar units in BiOIO3, forming BiO(IO3)1-x(BrO3)x solid solutions with local lattice distortion and polarization-related charge-separation regulation. The optimized BiO(IO3)0.8(BrO3)0.2 solid solution exhibited markedly enhanced photocatalytic water purification performance under simulated solar irradiation, achieving 99% Rhodamine B degradation within 12 min and efficient removal of multiple cationic and anionic dyes. The optimized sample also showed effective degradation of mixed dye systems, improved tolerance to coexisting inorganic anions, and photocatalytic antibacterial activity against Staphylococcus aureus and Escherichia coli. Theoretical calculations, piezoresponse force microscopy and photoelectrochemical analyses revealed that BrO3-/IO3- regulation induced XO3- unit distortion and electron redistribution, enhanced the polarization response, accelerated carrier migration, and suppressed electron-hole recombination. This work demonstrates that direct regulation of XO3- polar units is an effective strategy for modulating polarization-assisted charge separation in BiOIO3, providing insight into the design of single-phase polar photocatalysts for broad-spectrum water purification.
Keywords:
BiOIO3
BrO3-/IO3- regulation
Internal polarization field
Photocatalytic water purification
Reactive oxygen species
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