The
tetrafluoroterephthalonitrile cross-linked β-cyclodextrin
was first subjected to the carboxylation reaction, followed by the
deposition of the Fe3O4 nanoparticles on its
surface to obtain the novel magnetic Fe3O4 nanoparticle/β-cyclodextrin-based
polymer composites (CDP-Fes). The successful preparation of the CDP-Fes
was confirmed by scanning electron microscopy, transmission electron
microscopy, two-dimensional EDS mapping, zeta potential measurement,
vibrating sample magnetometry, wide-angle X-ray diffraction, thermogravimetric
analysis, Brunauer–Emmett–Teller surface area analysis,
and Fourier transform infrared spectroscopy. The adsorption behaviors
of one of the CDP-Fesnamely, 0.6FeCT-0.96β-CDfor
the Methylene Blue (MB) dye were investigated in detail. The 0.6FeCT-0.96β-CD
not only possessed a high adsorption capacity of 565 mg/g for the
MB but also exhibited several advantages, such as the magnetic recycling
ability with quick response, the reusing ability, and the selective
adsorption ability. Furthermore, it was found that the pH value of
the MB solution could influence the adsorption capacity of the 0.6FeCT-0.96β-CD,
and the MB adsorption process of the 0.6FeCT-0.96β-CD obeyed
the Langmuir model and the pseudo-second-order model.
In this paper, a magnetic graphene oxide (MGO) composite was prepared by the click reaction between the alkyne-modified Fe3O4 nanoparticles and the azide-modified graphene oxide for the purpose of removing the Congo red (CR) dye from water. The deposition of the Fe3O4 nanoparticles on the graphene oxide to successfully prepare the MGO composite was evidenced by the Fourier-transform infrared spectrometer, wide-angle X-ray diffraction equipment, scanning electron microscope, thermal gravimetric analyzer, and Raman spectrometer. The value of saturation magnetization for the MGO composite was 34.9 emu/g. The CR absorption capacities of the MGO composite increased first and then decreased as the pH value increased. It was found that the maximum adsorption capacity of the MGO composite for the CR was as high as 769.2 mg/g. In the absorption-desorption experiment, the CR absorption capacities of the MGO composite from the second cycle to the fifth cycle remained stable to be about 130 mg/g. Moreover, both the Langmuir model for the adsorption isotherm and the pseudo-second-order kinetic model could be used to describe the CR absorption behaviors of the MGO composite.
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