A Simple and Scalable Method for the Preparation of Magnetite/Graphene Oxide Nanocomposites under Mild Conditions

Abstract

Nanostructured composite dispersions containing magnetic nanoparticles (MNPs) and graphene oxide (GO) lamellae have been prepared by a simple and easily scalable room temperature procedure. We show that, owing to the enormous surface area and negative surface charge developed in aqueous GO suspensions, large amounts of positively charged MNPs can be electrostatically attached to the layered host. is procedure is superior to many previous synthesis pathways because it exploits the chargeregulated adhesion of naked MNPs to GO resulting in the formation of stable and uniform nanocomposite materials in a wide composition range without any preliminary functionalization steps or harsh conditions that may lead to chemical degradation of the graphene-based nanosheets.

Computational DFT study of magnetite/graphene oxide nanoadsorbent: Interfacial chemical behavior and remediation performance of heavy metal hydrates from aqueous system

“…However, the most intense band shows a red shift at 23 cm −1 , indicating a slight weakening of the bond strength between Fe and O atoms. This might be caused by the extensive hydrogen bond network between the hydroxylated GO and Fe 3 O 4 surfaces, but it is also possible that there is an abundance of positively charged surface sites (triple bond Fe-OH 2+ ) developed on the iron oxide when it is contacted with GO (Szabó et al, 2018). This indicate that Fe 3 O 4 was successfully grafted on GO (Tayyebi, Outokesh, Moradi, & Doram, 2015).…”

Tunable Magnetic Hyperthermia Properties of Pristine and Mildly Reduced Graphene Oxide/Magnetite Nanocomposite Dispersions

“…In both cases rGO was prepared first, and then the composite was synthesized, adding iron precursors and ammonia solution to initiate the formation of magnetic nanoparticles in situ. According to our knowledge, among the numerous papers published on the synthesis and application of GO/MNP nanocomposite materials, it is only our recent study [33] which demonstrates the theranostic potential of GO/MNP composites prepared by heterocoagulation. However, the effect of post-reduction on the heat evolution caused by these composites in an alternating magnetic field has yet been almost completely disregarded.…”

“…Electrostatic interaction was used to prepare Fe 3 O 4 @Graphene Oxide composites by Hu et al [23], building it from GO modified with positively charged polyelectrolyte (poly(diallyldimethylammonium chloride), PDDA) and silica-coated MNPs for environmental purposes, extending thereby the class of magnetically modified supports such as layered silicates [24][25][26][27], mesoporous materials [28][29][30][31] or porous hydrogel matrices [32]. Earlier, we have proposed a mild one-pot synthesis method to fabricate GO/MNP nanocomposites, which was the first of its kind because, unlike other methods based on an in situ particle growth in a GO matrix, it entirely relied on the electrostatic attraction between unmodified GO sheets and bare MNPs [33].…”

“…Ultrapure water produced by a Zeener Power RO&UP system was used as dispersion medium and the experiments were carried out mainly at room temperature (25 • C). Magnetic nanoparticles were synthesized by a traditional co-precipitation method using Fe(II) and Fe(III) salts under strongly alkaline conditions and purified by dialysis against dilute (0.001 M) HCl, as was described in detail elsewhere [4,33]. Graphite oxide was prepared by the Hummers-Offeman method, using KMnO 4 , and NaNO 3 for oxidation of graphite flakes (SGA20 graphite powder, Kropfmühl GmbH, Germany) under highly acidic circumstances (cc.…”

“…Graphite oxide was prepared by the Hummers-Offeman method, using KMnO 4 , and NaNO 3 for oxidation of graphite flakes (SGA20 graphite powder, Kropfmühl GmbH, Germany) under highly acidic circumstances (cc. H 2 SO 4 ) [33,43]. The product was purified by dialysis against water to eliminate the excess of salts originating from synthesis.…”