TY - JOUR
T1 - New insight into the mechanism of enhanced photo-Fenton reaction efficiency for Fe-doped semiconductors
T2 - A case study of Fe/g-C3N4
AU - Li, Keyan
AU - Liang, Yan
AU - Yang, Hong
AU - An, Sufeng
AU - Shi, Hainan
AU - Song, Chunshan
AU - Guo, Xinwen
N1 - Funding Information:
This work was supported by the National Natural Science Foundation of China (Grant No. 21401017 ) and the Fundamental Research Funds for the Central Universities (Grant No. DUT19LK17 ).
Publisher Copyright:
© 2020 Elsevier B.V.
PY - 2021/7/1
Y1 - 2021/7/1
N2 - Visible light has shown to greatly enhance the activity of iron-doped semiconductor catalyst in a Fenton reaction system, however, the mechanism for this activity enhancement remains unclear. This work attempts to reveal the origin of this visible light driven activity enhancement by studying the iron doped semiconductor catalyst Fe/g-C3N4 in both photo-Fenton and dark Fenton reactions. Through analysis of XPS spectra of catalyst, it is found that Fe2+/Fe3+ ratio for Fe/g-C3N4 catalyst remains unchanged and sustained during the photo-Fenton reaction cycles. This is in direct contrast to the progressively decreased Fe2+/Fe3+ ratio observed in the dark Fenton reaction. It is clear that under visible light, Fe3+ is able to capture the photo-generated electrons from the semiconductor and revert back to Fe2+, thus sustain the catalytic activity during the photo-Fenton reaction. This new mechanistic insight will guide the future design and optimization of high performance catalysts by immobilizing transition metal ions in semiconductors for advanced oxidation processes.
AB - Visible light has shown to greatly enhance the activity of iron-doped semiconductor catalyst in a Fenton reaction system, however, the mechanism for this activity enhancement remains unclear. This work attempts to reveal the origin of this visible light driven activity enhancement by studying the iron doped semiconductor catalyst Fe/g-C3N4 in both photo-Fenton and dark Fenton reactions. Through analysis of XPS spectra of catalyst, it is found that Fe2+/Fe3+ ratio for Fe/g-C3N4 catalyst remains unchanged and sustained during the photo-Fenton reaction cycles. This is in direct contrast to the progressively decreased Fe2+/Fe3+ ratio observed in the dark Fenton reaction. It is clear that under visible light, Fe3+ is able to capture the photo-generated electrons from the semiconductor and revert back to Fe2+, thus sustain the catalytic activity during the photo-Fenton reaction. This new mechanistic insight will guide the future design and optimization of high performance catalysts by immobilizing transition metal ions in semiconductors for advanced oxidation processes.
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U2 - 10.1016/j.cattod.2020.07.026
DO - 10.1016/j.cattod.2020.07.026
M3 - Article
AN - SCOPUS:85089549796
SN - 0920-5861
VL - 371
SP - 58
EP - 63
JO - Catalysis Today
JF - Catalysis Today
ER -