Introduction of Fe on rGO/TiO2 improves styrene visible light-driven photocatalytic oxidation: Characterization, stability, kinetics, and mechanism

[Display omitted] •rGO/Fe0.5%TiO2 performed the best styrene photocatalytic removal.•Fe and rGO doping increased the formation of OH radicals.•Fe doping reduced the band gap and further enhanced photocatalytic activity.•A hydrophilic surface was formed during the photocatalytic degradation reaction....

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Veröffentlicht in:Journal of photochemistry and photobiology. A, Chemistry. Chemistry., 2023-05, Vol.439, p.114613, Article 114613
Hauptverfasser: Narindri Rara Winayu, Birgitta, Weng, Wei-Chen, Chu, Hsin
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Sprache:eng
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Zusammenfassung:[Display omitted] •rGO/Fe0.5%TiO2 performed the best styrene photocatalytic removal.•Fe and rGO doping increased the formation of OH radicals.•Fe doping reduced the band gap and further enhanced photocatalytic activity.•A hydrophilic surface was formed during the photocatalytic degradation reaction. Photocatalytic process is a preferable strategy for air pollutant removal due to its high efficiency and mild operating condition. In this study, co-doping of reduced graphene oxide (rGO) and Fe were performed on TiO2 to enhance styrene removal. Addition of 0.1 wt% rGO promoted the photocatalytic activity of TiO2 and further improvement was achieved by introduction of Fe. The best photocatalytic activity was achieved by 0.1 wt%rGO/Fe0.5%/TiO2 which might be carried out by changes in reduction of band gap and electron-hole pair recombination rate. This result was also proven by the characterization analyses along with the detection of OH radicals which played an important role in the photocatalytic degradation of styrene. 1 % relative humidity accelerated photocatalytic degradation of styrene due to supply of OH radical species, however, excess amount of water vapor led to declining of photocatalytic activity due to adsorption competition on active sites. Furthermore, kinetics study using Langmuir Hinshelwood kinetics model 4 performed the best fitting with experimental data and proposed photocatalytic reaction mechanism was also built from analysis of generated intermediates.
ISSN:1010-6030
1873-2666
DOI:10.1016/j.jphotochem.2023.114613