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Title: Highly magnetizable crosslinked chloromethylated polystyrene-based nanocomposite beads for selective molecular separation of 4‑aminobenzoic acid
Authors: Costa, Fábio Teles
Jardim, Katiúscia Vieira
Palomec-Garfias, Abraham F.
Cáceres-Vélez, Paolin R.
Chaker, Juliano A.
Medeiros, Anderson M. M. S.
Moya, Sergio E.
Sousa, Marcelo H.
Assunto:: Nanopartículas
Ácidos
Ácido benzóico
Issue Date: 2019
Publisher: American Chemical Society
Citation: COSTA, Fábio Teles et al. Highly magnetizable crosslinked chloromethylated polystyrene-based nanocomposite beads for selective molecular separation of 4‑aminobenzoic acid. ACS Omega, v. 4, n. 3, p. 5640−5649, 2019. DOI: 10.1021/acsomega.9b00142. Disponível em: https://pubs.acs.org/doi/10.1021/acsomega.9b00142. Acesso em: 01 abr. 2019.
Abstract: In this work, we describe the preparation and characterization of highly magnetizable chloromethylated polystyrene-based nanocomposite beads. For synthesis optimization, acid-resistant core−shelled maghemite (γ-Fe2O3) nanoparticles are coated with sodium oleate and directly incorporated into the organic medium during a suspension polymerization process. A crosslinking agent, ethylene glycol dimethacrylate, is used for copolymerization with 4-vinylbenzyl chloride to increase the resistance of the microbeads against leaching. X-ray diffraction, inductively coupled plasma atomic emission spectroscopy, thermogravimetric analysis, scanning electron microscopy, transmission electron microscopy, and optical microscopy are used for bead characterization. The beads form a magnetic composite consisting of ∼500 nm-sized crosslinked polymeric microspheres, embedding ∼8 nmγ-Fe2O3 nanoparticles. This nanocomposite shows large room temperature magnetization (∼24 emu/g) due to the high content of maghemite (∼45 wt %) and resistance against leaching even in acidic media. Moreover, the presence of superficial chloromethyl groups is probed by Fourier transform infrared and X-ray photoelectron spectroscopy. The nanocomposite beads displaying chloromethyl groups can be used to selectively remove aminated compounds that are adsorbed on the beads, as is shown here for the molecular separation of 4-aminobenzoic acid from a mixture with benzoic acid. The high magnetization of the composite beads makes them suitable for in situ molecular separations in environmental and biological applications.
Licença:: This is an open access article published under an ACS AuthorChoice License, which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
DOI: https://dx.doi.org/10.1021/acsomega.9b00142
Appears in Collections:TEC UnB - Artigos publicados em periódicos

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