Room‐Temperature Self‐Assembled Preparation of Porous ZnFe₂O₄/MIL‐100(Fe) Nanocomposites and Their Visible‐Light Derived Photocatalytic Properties

Abstract

Herein, a facile self‐assembly synthesis of magnetic porous ZnFe2O4/MIL‐100(Fe) composites by slowly oxidizing Fe2+ to Fe3+ was reported. By this method, ZnFe2O4/MIL‐100(Fe) composites with a particle size of about 300 nm can be obtained at room temperature and pressure. The efficacy of the products was evaluated for the degradation of Rhodamine B (RhB) under visible light irradiation. It was found that the introduction of MIL‐100(Fe) can not only significantly improve the adsorption capacity of composites and provide more active sites for the degradation process, but also form heterojunctions with ZnFe2O4 particles to efficiently promote separation of photogenerated electron‐hole pairs. Moreover, the existence of ZnFe2O4 provides good magnetic recovery property and photochemical stability to composite samples. These results indicate that ZnFe2O4/MIL‐100(Fe) has obvious application potential in photocatalytic wastewater treatment.

Green and Facile Synthesis of Metal-Organic Framework Cu-BTC-Supported Sn (II)-Substituted Keggin Heteropoly Composites as an Esterification Nanocatalyst for Biodiesel Production

“…By contrast, metalorganic frameworks (MOFs) provide excellent support, having the features of stability, adjustable tunnels, ultra-high specific surface area, and high catalytic efficiency (Kang et al, 2019;Li D. D. et al, 2019). Examples are PTA@MIL-53 (Fe) (Nikseresht et al, 2017), AILs/HPW/UiO-66-2COOH (Xie and Wan, 2019b), and ZnFe 2 O 4 /MIL-100(Fe) (Hu et al, 2019). Meanwhile, our previous studies showed the esterification of oleic acid or lauric acid with methanol over silicotungstic acid and nickel salts of Keggin-type heteropolyacids encapsulated into metal-organic framework (UiO-66) hybrid nanocatalysts that had excellent activity and reusability (Zhang et al, 2019b(Zhang et al, , 2020.…”

Construction of a Keggin heteropolyacid/Ni-MOF catalyst for esterification of fatty acids

“…7b), the peaks at 284.7 eV and 288.5 eV, which can be assigned to C-C/C]C of phenyl and C]O of carboxyl, respectively. 39 Moreover, four peaks are observed at 855.6 eV, 861.5 eV are conrmed to Ni 2p 3/2 and 873.5, 879.7 eV are ascribed to Ni 2p 1/2 , indicating the valence state of Ni is +2 (Fig. 7c).…”

Preparation of Mn2O3/MIL-100(Fe) composite and its mechanism for enhancing the photocatalytic removal of rhodamine B in water

“…Among preparation methods, the hydrothermal method is the preferred choice because of its simplicity, ease of implementation, and high efficiency. [26][27][28][29][30][31] In the environmental eld, MIL-100(Fe) is also capable of removing many pollutants, such as heavy metals (Cr 6+ ), 29,31 RhB, 32,33 tetracycline antibiotic, 31 and microcystin-LR. 34 Although both Mn 2 O 3 and MIL-100(Fe) can be used as photocatalysts under visible light due to their low bandgaps (i.e., 1.44 eV and 2.6-2.7 eV, respectively), the high recombination of photoexcited electrons and holes in these two individual materials hinders their practical application for photocatalysis.…”

“…These photoexcited electron-hole pairs are easily recombined together with a very short lifetime unless they are separated and consumed. In the M100Mn material, the electromagnetic eld at the interface of Mn 2 O 3 and MIL-100(Fe) helps to move the electrons and holes in opposite ways 56. Specically, the electrons from the conduction band of Mn 2 O 3 transfer to the conduction band of MIL-100(Fe) with higher potential.…”