An amino-functionalized magnetic framework composite of type Fe3O4-NH2@MIL-101(Cr) for extraction of pyrethroids coupled with GC-ECD

Abstract

An amino-functionalized magnetic framework composite of type FeO-NH@MIL-101(Cr) was synthesized using a solvothermal method. The material was characterized by scanning electron microscopy, X-ray diffraction, Fourier transform infrared spectroscopy, nitrogen adsorption, and magnetometry. The composite combines the advantages of amino-modified FeO and MIL-101(Cr). The presence of amino groups facilitates the fairly specific adsorption of pyrethroids. The composite was employed as a sorbent for magnetic solid phase extraction of five pyrethroids from environmental water samples. Following desorption with acidified acetone, the pyrethroids were quantified by gas chromatography with electron capture detection. The detection limits for bifenthrin, fenpropathrin, λ-cyhalothrin, permethrin, and deltamethrin range from 5 to 9 pg·mL. The method is rapid, accurate, and highly sensitive. The molecular interactions and free binding energies between MIL-101(Cr) and the five pyrethroids were calculated by means of molecular docking. Graphical abstract A novel functionalized magnetic framework composite of type FeO-NH@MIL-101(Cr) was synthesized. It was applied as a sorbent for magnetic solid phase extraction of pyrethroids prior to their quantitation by gas chromatography with electron capture detection. The molecular interactions of analytes and MIL-101(Cr) were studied.

Bioinspired Self‐Supporting Phthalocyanine@ZnIn2S4 Foam for Photocatalytic CO2 Reduction Under Visible Light Irradiation

“…After forming the composites of Pc@ZnIn 2 S 4 , the FTIR spectrum mainly shows the peak of ZnIn 2 S 4 , and the peak belonging –NH 2 is negligible due to the low loading amount of Pc. [ 14 ] The Raman spectrum of Pc@ZnIn 2 S 4 in Figure 4i shows a slight redshift of the Pc band at 1534 cm −1 after binding Pc to ZnIn 2 S 4 , further proving the existence of strong interaction between ZnIn 2 S 4 and Pc. [ 13 ]…”

Magnetic Metal Organic Framework Immobilized Laccase for Wastewater Decolorization

“…The synthesis of the amino-functionalized magnetic metal-organic framework (Fe 3 O 4 -NH 2 @MIL-101(Cr)) was performed according to the literature [28]…”

“…Additionally, the presence of functional groups was determined using the FTIR spectra of the free laccase, immobilized laccase and Fe 3 O 4 -NH 2 @MIL-101(Cr) MOF as shown in Figure 1c. The Fe 3 O 4 -NH 2 @MIL-101(Cr) MOF typical peaks are represented by sharp peaks at 590, 1400 and 1554 cm −1 [28]. The amine stretching vibration of the C-N bond is represented by the peak band at 1321 cm −1 [29].…”

Determination of pyrethroids in water samples by dispersive solid‐phase extraction coupled with high‐performance liquid chromatography

“…Hence, pyrethroids have widely replaced organochlorine pesticides (Lu et al, 2019). Although pyrethroids have some advantages, as mentioned above, the massive usage of pyrethroid pesticides has an adverse effect on aquatic ecosystems such as surface and ground waters (He et al, 2018; Rousis et al, 2017). Therefore, it is of great importance to develop a quick, effective, and sensitive method for the detection of pyrethroid residues in water samples.…”