Three-dimensional Fe3O4-graphene macroscopic composites for arsenic and arsenate removal

Electrochemical Determination of Paracetamol Using Fe3O4/Reduced Graphene-Oxide-Based Electrode

“…Two broad peaks at around 26 ∘ and 44 ∘ could be attributed to the initial graphite indicating that the oxidation of graphite was incomplete. In fact, a similar result is also obtained in reported papers [35,36]. After reduced by ascorbic acid, the material does not show the peak at 11.3 ∘ , and the weak and broad reflection peak at 25.8 ∘ corresponds to the relative short-range order structures in disordered stacked rGO [37], which indicates the successful reduction of GrO.…”

“…The high-resolution XPS for C 1s of rGO is shown in Figure 4(b). The deconvoluted C 1s spectrum implies that rGO consists of functional groups such as sp 3 (C-C, 282.2 eV), hydroxyl and epoxy (C=O, 284.2 eV), and carbonyl (C=O, 286.03 eV) [35]. The calculation of the atomic contributions shows the number of C-O and C=O groups on Fe 3 O 4 /rGO to be 43.8% and 16.0%, respectively, while maintaining the amount of C-C groups at 40.2%.…”

“…A peak at 726.6 eV is attributed to 2p1/2 (Fe(III)) and the satellite peaks at 719.35 eV and 733.5 eV are characteristic for maghemite. The broad peaks of 2p3/2 Fe(II) at 713.1 eV and 2p1/2 Fe(III) at 724.75 eV are typical for magnetite [35]. Although nitrogen was bubbled during the synthesis process, a part of Fe(II) was oxidized by available oxidant agents (diluted oxygen, organic species in the oxidation form …”

Magnetically Recyclable Fe3O4/GO-NH2/H3PMo12O40 Nanocomposite: Synthesis, Characterization, and Application in Selective Adsorption of Cationic Dyes from Water

“…In the spectrum of Fe 3 O 4 / GO-Si(CH 2 ) 3 NH 2 sample (abbreviated as Fe 3 O 4 /GO-NH 2 ) in Figure 3(b), the strong band at about 588 cm -1 is assigned to the Fe-O stretching vibration of the spinel-type Fe 3 O 4 structure. 57 The presence of Si-O bond was confirmed by a strong band at about 1116 cm −1 assigned to the Si-O-C stretching vibration. 58,59 Also, two broad bands at 3430 and 1630 cm -1 can be ascribed to the stretching and bending modes of -NH 2 groups, respectively.…”

PREPARATION OF RED MUD/GRAPHENE COMPOSITE AND ITS APPLICATION FOR ADSORPTION OF As(III) FROM AQUEOUS SOLUTION

“…Among the most common methods, adsorption is a preferable choice since it does not require high-cost equipment and is easy to operate [4,5]. Recently, Fe 3 O 4 -graphene composites [6] or Fe 3 O 4 nanoparticles hybridized with carbonaceous materials [7] were effectively used for the removal of arsenate from aqueous solution [8]. However, most of these adsorbents require the preparation of graphite oxide via Hummer's method.…”