Heterojunction catalysts have drawn increasing interest for the
visible light-driven Fenton reaction and bring tremendous opportunities
for environmental remediation. Herein, a BiOI/MIL-53(Fe) Z-scheme
heterojunction (named BMFe) was synthesized for the first time via
a facile strategy. Compared with pristine BiOI and MIL-53(Fe) catalysts,
the two-dimensional/three-dimensional (2D/3D) heterojunction catalyst
manifested remarkable catalytic performance toward degradation of
phenol, bisphenol A, methylene blue, and carbamazepine, which is attributed
mainly to the interfacial integration and efficient charge separation.
By virtue of coupling at the interface, as confirmed by XPS, 57Fe Mössbauer spectroscopy, and DFT calculations, the
BMFe catalyst promoted the transfer of electron–hole pairs
via Z-scheme and improved the chemical activation of hydrogen peroxide.
The subsequent holes, free radicals, and nonradicals can effectively
and continuously decompose pollutants, achieving a positive synergistic
effect between photocatalysis and Fenton reactions. Simultaneously,
the specially designed BiOX(X = Br, Cl)/MIL-53(Fe) and BiOI/Fe-MOFs(MIL-101,
MIL-88) heterojunctions also exhibited advanced oxidative capacity
for organic pollutants. Given their practical value for industrial
applications, BMFe beads (1.0 ± 0.15 mm) synthesized via a blend
cross-linking method can significantly advance long-term stability
and recyclability. The integration of Fe-based metal–organic
frameworks with bismuth oxyhalide semiconductors provides a new perspective
on developing heterojunction catalysts for environmental remediation.