Modular Construction of an MIL-101(Fe)@MIL-100(Fe) Dual-Compartment Nanoreactor and Its Boosted Photocatalytic Activity toward Tetracycline

Abstract

Iron-based metal–organic frameworks (MOFs) have aroused extensive concern as prospective photocatalysts for antibiotic (e.g., tetracycline, TC) degradation. However, efficiencies of single and simple Fe-based MOFs still undergo restricted light absorption and weak charge separation. Assembly of different iron-based MOF building blocks into a hybrid MOF@MOF heterostructure reactor could be an encouraging strategy for the effective capture of antibiotics from the aqueous phase. This paper reports a new-style MIL-101(Fe)@MIL-100(Fe) photocatalyst, which was groundbreakingly constructed to realize a double win for boosting the performances of adsorption and photocatalysis. The optical response range, surface open sites, and charge separation efficiency of MIL-101(Fe)@MIL-100(Fe) can be regulated through accurate design and alteration. Attributed to the synergistic effects of double iron-based MOFs, MIL-101(Fe)@MIL-100(Fe) exhibits an excellent photocatalytic activity toward TC degradability compared to MIL-101(Fe) and MIL-100(Fe), which is even superior to those reported previously in the literature. Furthermore, the main active species of •O2 – and h+ were proved through trapping tests of the photocatalytic process. Additionally, MIL-101(Fe)@MIL-100(Fe) possesses remarkable stability, maintaining more than 90% initial photocatalytic activity after the fifth cycle. In brief, MIL-101(Fe)@MIL-100(Fe) was highly efficient for TC degradation. Our work offers a new strategy for visible-light photodegradation of TC by exploring the double Fe-based MOF composite.

Fe3O4@ZIF-8@SiO2 Core–Shell Nanoparticles for the Removal of Pyrethroid Insecticides from Water

“…Figure A exhibits obvious characteristic peaks of Zn, Fe, O, N, C, and Si from the composite nanoparticles, further proving the successful combination of Fe 3 O 4 , ZIF-8, and SiO 2 . In the XPS spectrum of Fe 3 O 4 @ZIF-8@SiO 2 , the two peaks at 708 and 722 eV correspond to Fe 2p 3/2 and Fe 2p 1/2 valence states of Fe and the two peaks at 1020 and 1044 eV correspond to Zn 2p 3/2 and Zn 2p 1/2 , respectively. , The weight percentage of metals in Fe 3 O 4 @ZIF-8@SiO 2 obtained by ICP is shown in Table S1. Composite nanoparticles have two metals, that is, Fe and Zn.…”

“…In the XPS spectrum of Fe 3 O 4 @ZIF-8@SiO 2 , the two peaks at 708 and 722 eV correspond to Fe 2p 3/2 and Fe 2p 1/2 valence states of Fe and the two peaks at 1020 and 1044 eV correspond to Zn 2p 3/2 and Zn 2p 1/2 , respectively. 34,42 The weight percentage of metals in Fe 3 O 4 @ZIF-8@SiO 2 obtained by ICP is shown in Table S1.…”

“…The combination of two different properties to construct nanoparticles will considerably improve the adsorption of organic pollutants. 33,34 By reviewing the previous literature studies, the materials used to adsorb pyrethroid insecticides are still limited to activated carbon materials, 35 cork, 36 polymer particles, 37 metal oxides, 38 and so forth. While these materials have certain adsorption properties, they still exhibit disadvantages such as low recovery, poor reusability, and poor dispersibility.…”

“…In addition, there are a large number of active free hydroxyl groups on the surface of SiO 2 , which provides conditions for the formation of hydrogen bonds during the adsorption process. The combination of two different properties to construct nanoparticles will considerably improve the adsorption of organic pollutants. , …”

Molecular Imprinted BiVO4 Microswimmers for Selective Target Recognition and Removal

“…[ 9–13 ] Alternative materials based on metal‐organic‐framework photocatalytic systems are also promising for fabricating photoactive microswimmers. [ 14 ]…”