Exploring the Effect of Morphologies of Fe(III) Metal‐Organic Framework MIL‐88A(Fe) on the Photocatalytic Degradation of Rhodamine B

Abstract

Metal-organic frameworks built from [Fe 3 (μ 3-O)(COO) 6 ] clusters and fumaric acid ligand, the so-called MIL-88 A(Fe) is a wellknown environment-friendly promising material for many applications. In this paper, three different morphologies of MIL-88 A(Fe) such as rod, diamond and spindle have been synthesized separately by reacting FeCl 3 * 6H 2 O and fumaric acid in 1 : 1 metal-ligand stoichiometric ratio using two different solvents such as water and DMF via hydrothermal method. The morphology of the products and their particle sizes were obtained using SEM and three distinct morphologies viz., rod, diamond and spindle were clearly distinguished by TEM. All the three samples were characterized by FT-IR, PXRD, UVDRS, PL, XPS and BET, and the effect of the morphologies of MIL-88 A (Fe) on the photocatalytic degradation of Rhodamine B (RhB) was studied under sunlight. The addition of an H 2 O 2 electron acceptor can markedly enhance the photocatalytic Rhodamine B degradation of MIL-88 A(Fe). Among these three, rod-shaped morphology of MIL-88 A(Fe) shows the higher photocatalytic effect for the degradation of Rhodamine B under sunlight due to its lower band gap, high surface area, and lower electronhole recombination rate which enable them the transfer of electrons for the photocatalytic degradation. We found that 98% degradation of RhB in 50 min has taken place by using r-MIL-88 A(Fe) as the catalyst under sunlight.

Controllable One-Dimensional Growth of Metal–Organic Frameworks Based on Uncarved Halloysite Nanotubes as High-Efficiency Solar-Fenton Catalysts

“…XRD patterns are employed to confirm the crystalline phases and chemical structures of HNTs, ZIF-67, MIL-88A, H x Z y, and H x M y composites, and the results are shown in Figure a,b. It can be seen that pristine HNTs show typical characteristic peaks at 2θ = 11.9, 20.0, 24.5, and 35.0° attributed to (001), (020, 110), (002) and (200, 130) lattice planes (Figure a), where (001) gives a multilayer wall spacing of 7.4 nm. ,, Besides, it should be noted that the positions of all peaks for ZIF-67 and MIL-88A are well matched with the related refs and . For ZIF-67, the characteristic peaks located at 7.5, 10.6, 12.9, and 18.3° could be ascribed to the (011), (002), (112), and (222) lattice planes of ZIF-67, respectively .…”

Turning on High‐Sensitive Organic Electrochemical Transistor‐Based Photoelectrochemical‐Type Sensor over Modulation of Fe‐MOF by PEDOT

“…Simultaneously, Fe‐MOF belonged to an n‐type semiconductor. [ 27 ] According to a previous report, [ 28 ] PEDOT is a p‐type conjugated polymer with VB and CB of 1.09 and −0.60 eV, respectively. This indicated that p–n heterojunctions could form between Fe‐MOF and PEDOT.…”

Metal–organic framework‐based heterojunction photocatalysts for organic pollutant degradation: design, construction, and performances

“…The morphology can be changed by optimization of the MOFs preparation method, including the selection of hydrothermal treatment time and temperature as well as the choice of a solvent and metal ion/organic ligand molar ratio. Viswanathan et al 86 prepared rod, diamond, and spindle MIL-88A(Fe) photocatalysts by varying the solvent and metal ion/organic ligand molar ratio. The authors found that the photocatalyst with a rodshaped morphology had a higher photocatalytic activity in the degradation of RhB due to its lower band gap, high surface area, and lower electron-hole recombination rate.…”

“…The morphology can be changed by optimization of the MOFs preparation method, including the selection of hydrothermal treatment time and temperature as well as the choice of a solvent and metal ion/organic ligand molar ratio. Viswanathan et al 86 . prepared rod, diamond, and spindle MIL‐88A(Fe) photocatalysts by varying the solvent and metal ion/organic ligand molar ratio.…”