New petroleum absorbers based on lignin‐CNSL‐formol magnetic nanocomposites

Abstract

A magnetic resin based on lignin produced using the Kraft process was prepared and characterized. The material, because of its aromatic/aliphatic balance, can be used in oil-spill clean-up processes. The resin was prepared through bulk polycondensation of lignin, cashew nutshell liquid, and formaldehyde in the presence of maghemite nanoparticles. The obtained magnetic composites were studied by Fourier transform infrared spectroscopy, X-ray diffraction, and Small-angle X-ray scattering. Cure degree, magnetic force, and oil removal capability tests were also performed. The results show that the composites possess an elevated cure degree, besides a considerable magnetic force. The materials exhibit a good oil removal capability-the composite containing 3.3 vol % of maghemite can remove 11 parts of oil from water. V C 2012 Wiley Periodicals, Inc. J Appl Polym Sci 126: E304-E311, 2012

PLA-b-PEG/magnetite hyperthermic agent prepared by Ugi four component condensation

“…The magnetic products obtained were also characterized by magnetic force tests, the results of which are shown in Table 4 and Figure 13. As expected, the chemical modification of magnetite and its covalent linkage to PEG and PLA by Ugi four component condensation decreased the values of magnetic force of the composite [40,74,75] when compared to free magnetite and aldehyde magnetite. These results are in agreement with those reported for the organic modification of magnetite [76][77][78].…”

An experimental study on the synthesis of poly(vinyl pivalate)-based magnetic nanocomposites through suspension polymerization process

“…Magnetic force measurements were conducted on an experimental apparatus similar to the one described by Grance et al [49], consisting of a combination of an analytical balance Shimadzu AY220 (Shimadzu do Brasil, São Paulo, Brazil), a voltage source ICEL PS-4100 (Icel, Manaus, Brazil), a digital multimeter ICEL MD-6450 (Icel, Manaus, Brazil), a Gaussmeter GlobalMag TLMP-Hall-02 (GLOBALMAG, São Paulo, Brazil); a home-made sample holder and a home-made electromagnet. Magnetic force is determined based on the mass variation of the samples subjected to different magnetic fields, produced by the electromagnet.…”

Fabrication, Property, and Application of Lignin-Based Nanocomposites

“…Grance et al reported the fabrication of lignin-CNSL-formol magnetic nanocomposites as novel petroleum absorbents [34]. The nanocomposite was prepared from lignin, cashew nutshell liquid (CNSL), and formaldehyde through bulk polycondensation, as well as the addition of magnetite nanoparticles.…”