The unforeseen relationship of Fe2O3 and ZnO on fibrous silica KCC-1 catalyst for fabricated Z-scheme extractive-photooxidative desulphurization

Fibrous silica KAUST Catalysis Centre (KCC-1) was prepared via a hydrothermal-microwave method, followed by incorporation of Fe2O3 and ZnO by an electrochemical technique to give ZnO-Fe2O3/KCC-1 (ZFK) catalysts. XRD, FESEM, N2 physisorption, FTIR, XPS, ESR and UV–Vis DRS were employed to characteriz...

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Bibliographic Details
Published in:Powder technology 2020-09, Vol.375, p.397-408
Main Authors: Hitam, C.N.C., Jalil, A.A., Izan, S.M., Azami, M.S., Hassim, M.H., Chanlek, N.
Format: Article
Language:English
Subjects:
Catalysis
Catalysts
Desulfurization
Dibenzothiophene
Electrochemistry
Energy gap
Extractive-photooxidative desulphurization
Ferric oxide
Fibrous silica KCC-1
Heterojunctions
Hydrothermal-microwave
Iron oxides
Metal oxides
Redox potential
Silica
Silicon dioxide
Surface defects
Z-scheme
Zinc oxide
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Summary:Fibrous silica KAUST Catalysis Centre (KCC-1) was prepared via a hydrothermal-microwave method, followed by incorporation of Fe2O3 and ZnO by an electrochemical technique to give ZnO-Fe2O3/KCC-1 (ZFK) catalysts. XRD, FESEM, N2 physisorption, FTIR, XPS, ESR and UV–Vis DRS were employed to characterize the catalysts. A varied amount of Fe2O3 and ZnO seems have insightful impact on the physicochemical behaviours of the KCC-1 while prominently enhanced the extractive-photooxidative desulphurization of dibenzothiophene (DBT). 5Z10FK demonstrated the best performance mainly due to a well distribution of both metal oxides on KCC-1, the highest Si-O-Fe and Si-O-Zn bonds, an appropriate amount of surface defect and suitable band gap energy. Besides, the suitable band positions of 10FK and 5ZK in 5Z10FK composite has allowed the formation of Z-scheme heterojunction for conserved strong redox potential. Kinetic studies revealed that the adsorption of DBT was the rate determining step, thus this reaction obeyed the Langmuir-Hinshelwood pseudo-first order. [Display omitted] •A well dispersion of Fe2O3 and ZnO dopants on KCC-1 was attained using electrolysis.•The highest performance was achieved using 5ZnO10Fe2O3/KCC-1 (5Z10FK).•5Z10FK possesses the strongest interaction between KCC-1, Fe2O3 and ZnO.•Appropriate band positions of 10FK and 5ZK has allowed the formation of Z-scheme.•Z-scheme has preserved the redox potential of 5Z10FK for enhanced performance.
ISSN:0032-5910
1873-328X
DOI:10.1016/j.powtec.2020.07.114