In this work, an useful way to fabricate the superhydrophobic electrospun multi-walled carbon nanotube (MWCNT)-SiO2/polyvinylidene fluoride (PVDF) composite membranes for the oil adsorption was developed. First, the SiO2 nanoparticles were prepared using the Stöber method followed by the modification with the trimethoxy (1H, 1H, 2H, 2H-heptadecafluorodecyl) silane (TMHFDS). Next, the nanofibrous MWCNT-SiO2/PVDF composite membranes were prepared by the electrospinning technique and then immersed into the TMHFDS solution to lower its surface energy. Furthermore, the structure of the TMHFDS-modified MWCNTs-SiO2/PVDF composite membranes were studied by the scanning electron microscope, the Fourier-transform infrared, the wide-angle x-ray diffraction, and the measurement results of the wetting property showed that the TMHFDS-modified MWCNTs-SiO2/PVDF composite membranes could be superhydrophobic with the highest water contact angle of 155°. The resultant TMHFDS-modified MWCNT-SiO2/PVDF composite membranes were able to absorb different oils with the adsorption capacities ranging from 4.2 g g−1 to7.2 g g−1.
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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