Magnetic Fe₃O₄-encapsulated VAN@MIL-101(Fe) with mixed-valence sites and mesoporous structures as efficient bifunctional water splitting photocatalysts

Abstract

Fe3O4/VAN@MIL-101(Fe) with both mesoporous and mixed-valence Fe3+/Fe2+ structures was controllably synthesized in the synthesis of MIL-101(Fe), and it was used as a bifunctional photocatalyst in photocatalytic water splitting.

Improved visible light photocatalytic nitrogen fixation activity using a FeII-rich MIL-101(Fe): breaking the scaling relationship by photoinduced FeII/FeIII cycling

“…S2 †) patterns of the materials MIL-101(Fe) and MIL-101(Fe II /Fe III ) showed welldefined diffraction peaks at 2θ = 9.4°, 12.6°, 16.6°, 18.8°, and 22.0°, consistent with the results of the previous study. [35][36][37][38][39] FTIR spectra (Fig. 2a) of the MIL-101(Fe II /Fe III ) and MIL-101 (Fe) materials showed small but unequivocal differences.…”

“…The absorption peaks observed at 1600 cm −1 and 1396 cm −1 were attributed to the stretching vibration of CvC in the benzene ring and the symmetric [ν s (C-O)] vibrations of the carboxyl groups, respectively. 36 The peak at 750 cm −1 was assigned to the bending vibration of the C-H in the benzene ring of H 2 BDC. The peak at 1680 cm −1 in the MIL-101(Fe) spectrum was the stretching vibration of CvO, which moved towards a lower wave number of 1662 cm −1 in the MIL-101(Fe II /Fe III ) spectrum due to the forming of hydrogen bonds with the hydroxyl group.…”

Current Trends and Approaches to Boost the Performance of Metal Organic Frameworks for Carbon Dioxide Methanation through Photo/Thermal Hydrogenation: A Review

“…Fe containing MOFs display dual functions, in which the Fe sites act as photocatalytic sites, whereas the organic linkers are responsible for charge separation and prevention of charge recombination . MIL-101 containing transition metal Fe displayed excellent ability for the photocatalytic nitrogen fixation and water splitting reactions. , PCN-250 is another Fe-based MOF which can be further enhanced by adding a second metal ion such as Mn, Zn, Ni, and Co into the framework . The classification and characteristics of metal–organic frameworks discussed above are summarized and illustrated as shown in Table and Figure .…”

“…113 MIL-101 containing transition metal Fe displayed excellent ability for the photocatalytic nitrogen fixation and water splitting reactions. 114,115 PCN-250 is another Fe-based MOF which can be further enhanced by adding a second metal ion such as Mn, Zn, Ni, and Co into the framework. 116 The classification and characteristics of metal− organic frameworks discussed above are summarized and illustrated as shown in Table 1 and Figure 5. 3.2.…”

Degradation of oxytetracycline by magnetic MOFs heterojunction photocatalyst with persulfate: high stability and wide range

“…the spectrum of MF-50 is very similar to that of MIL-101, but its satellite peaks are shifted, demonstrating an interaction between Fe 3 O 4 and MIL-101. As shown in the Fig.2d, the O 1s spectra of both MIL-101 and MF-50 can be divided into three peaks corresponding to C-O, C = O, and Fe-O bonds(Guo et. al, 2020).The Fe-O peak of MIL-101 is lower than that of the C = O bond, while the contrary is observed for MF, indicating that Fe 3 O 4 is successfully compounded with MIL-101.3.2.…”