Reversible redox behavior of Fe2O3/TiO2 composites in the gaseous photodegradation process
Source abstract
Abstract
Abstract The use of photocatalytic technology in VOCs pollutants removal has caused great attention. Fe2O3 possesses some unique advantages among diverse visible-light driven photocatalysts due to its narrow bandgap, abundant reserves and favorable biosafety. In this work, Fe2O3/TiO2 composites was fabricated by a facile impregnation method and their photocatalytic performance towards acetaldehyde and o-xylene was detected. TEM, EDS, photoluminescence spectra and UV-Vis were used to characterize the morphology and properties of the Fe2O3/TiO2 composites. It was proved that the photocatalytic ability of TiO2 was greatly improved by coupling with Fe2O3. Interestingly, the Fe2O3/TiO2 composites showed deactivation in the degradation of acetaldehyde while no such phenomenon in the o-xylene case. The reason could be that Fe3+ accepted the photo-induced electrons of TiO2 and was reduced to Fe2+, which can easily combine with the intermediate product of acetaldehyde and generated Fe(CH3COO)2. Moreover, the deactivated photocatalyst can be regenerated by heat treatment, since Fe(CH3COO)2 can be decomposed into Fe2O3 in air. ESR was further used to demonstrate this mechanism. This work reveals the coupled redox reactions in the photocatalytic process, which is benefit for the design of new photocatalysts.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: TiO2 Photocatalysis and Solar Cells · Advanced Photocatalysis Techniques · Advanced Nanomaterials in Catalysis
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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