Abstract
The iron (III) benzene dicarboxylate metal-organic framework material (MIL-53(Fe)) was synthesized with either the solvent-thermal or hydrothermal method under different conditions. The influence of the type of solvents, molar ratio of precursors and solvent, temperature, and reaction time on the structure of MIL-53(Fe) was investigated. The material was characterized by using X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS), and N2 adsorption/desorption isotherm. The MIL-53(Fe) structure formed in N′, N-dimethylformamide (DMF) and methanol (MeOH) but not in water. In DMF, the molar ratio of precursors and solvent, temperature, and reaction time had a significant effect on the crystal structure of MIL-53(Fe). Under optimal conditions, MIL-53(Fe) has high crystallinity and a large specific surface area ( S BET = 88.2 m2/g). The obtained MIL-53(Fe) could serve as a potential heterogeneous catalyst to oxidize phenol (PhN), rhodamine B (RhB), and methylene blue (MtB) in the Fenton-like reaction system at the different solution pHs.
Highlights
Influence of Solvent Type. e influence of DMF, MeOH, and water on the formation of the crystal structure of iron (III) benzene dicarboxylate is evaluated from X-ray diffraction (XRD) data. e XRD patterns of the samples synthesized in DMF and MeOH exhibit diffraction peaks at 7.24, 8.92, 9.72, 10.15, and 12.50° (Figure 1(a)). ese peaks indicate that the metalorganic framework structure is formed in the reaction
The sample synthesized in MeOH has diffraction peaks with higher 2θ at 17, 25, and 27.6° (Figure 1(b)), and they are the typical diffraction peaks for BDC. is evidence indicates that a large amount of BDC does not react or only binds with iron (III) in the form of individual structures. e sample synthesized in water exhibits only the characteristic diffraction peaks of BDC without diffraction peaks at smaller angles (Figure 1(b))
E MIL-53(Fe) structure is formed via the bonds between iron (III)/iron oxide and the BDC anion, and the number of these bonds has a significant influence on the synthesis efficiency
Summary
Metal-organic frameworks (MOFs) are porous nanomaterials with large specific surface area and considerable pore volume [1,2,3,4,5,6,7,8,9,10,11]. ese materials have attracted a lot of attention from scientists due to their perfect structure and applicability in such fields as gas separation and storage [12,13,14,15,16,17], molecular sensors [18, 19], adsorption [1,2,3,4, 20,21,22], and catalysis [5,6,7,8, 23,24,25,26,27]. MIL-53(Fe) has attracted the attention of researchers due to its framework containing iron that acts as the structural nodes functioning as a new photocatalyst [5, 24] and a catalyst in the Fenton-like reaction system [6,7,8, 25]. E influence of solvent type, solvent content, temperature and time of reaction, and the molar ratio of precursors has been investigated to produce MIL-53(Fe) with high crystallinity and a large specific surface area. The obtained material is used as a catalyst in the Fenton-like reaction system to oxidize phenol (PhN), rhodamine B (RhB), and methylene blue (MtB). E concentration of PhN in the solution was determined with high-performance liquid chromatography (HPLC) on the UFLC Shimadzu (Japan) equipment. E RhB (or MtB) concentration in the supernatant was determined with the UV-Vis method on the Jasco V-770 (Japan) at λmax 554 nm for RhB (λmax 664 nm for MtB)
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
