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ENGINEERING Fe-MODIFIED TiO2 NANOSTRUCTURES FOR TUNABLE CO2 PHOTOREDUCTION INTO CO AND CH4
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DOI：10.1016/j.cattod.2026.115944.png)
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Abstract
En 中文
The environmental impact of anthropogenic pollution has driven the search for efficient photocatalysts. Fe-decorated TiO2 nanostructures were synthesized via hydrothermal method at controlled pH values (6, 8, and 10) followed by Fe impregnation (0.2 – 1.6 wt%), and evaluated for dye degradation and CO2 photoreduction. XRD, Raman, and XPS confirmed anatase retention and atomically dispersed surface Fe3+ species. Increasing Fe content decreased dye degradation but enhanced CO2 photoreduction, showing an opposite trend explained by a unified Fe3+/Fe2+ redox-trap mechanism: Fe3+ captures electrons, prolonging charge separation; excess Fe2+ scavenges holes, suppressing dye radicals while accumulating electrons for CO2 reduction. Thermal treatment (400 °C for 4 h) improved performance in the pH 6 and 8 samples but not in the pH 10 sample or commercial TiO2. Samples prepared at pH 8 showed the best CO2 photoreduction, attributed to a facet-driven surface heterojunction acting synergistically with Fe species. These findings establish design principles for tuning TiO2 photocatalysts toward selective oxidation or reduction applications.
Keywords:
Photocatalysis
TiO2
Fe decoration
CO2reduction
dye degradation
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5.3
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3.9W
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