Synthesis of magnetic iron oxide/graphene oxide nanocomposites for removal of cadmium ions from water

Abstract

In this study, magnetic iron oxide/graphene oxide (Fe 3 O 4 /GO) nanocomposites were developed for removal of cadmium ions (Cd 2+ ) from water, which could be effectively separated from the solution owing to its superparamagnetic property. The Fe 3 O 4 /GO nanocomposites were fabricated by coprecipitation method with different precursor ratios of 8:1, 4:1, 2:1, and 1:1. It was found that the suitable ratio of Fe 3 O 4 /GO for Cd 2+ ions adsorption was 4:1 (FG2). The effects of contact time, pH, and metal initial concentration on the adsorption properties of FG2 for Cd 2+ in water were investigated. The adsorption data of FG2 followed pseudo-second-order kinetic and Langmuir isotherm models with the maximum adsorption capacity of 52.083 mg g −1 at pH 8. The structure and morphology of FG2 were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) specific surface area, and vibrating sample magnetometry (VSM). TEM images of FG2 presented the Fe 3 O 4 nanoparticles in the size range of 10-15 nm decorated on GO nanosheets. The BET specific surface area of FG2 was observed to be 180.84 m 2 g −1 . VSM result of FG2 was 41.13 emu g −1 . Accordingly, FG2 could be considered as a highly efficient adsorbent for removing Cd 2+ from water.

Synthesis of furfural from sugarcane bagasse by hydrolysis method using magnetic sulfonated graphene oxide catalyst

“…This is also equivalent to the XRD data for Fe3O4 cubic phase with a face-centred cubic (fcc) structure. [17] The TEM image in figure 2a-2b revealed that GO and SGO contained two-dimensional monolayer with many wrinkles on their surfaces because of the interaction of π-π bonding or among oxygencontaining group, [13] but for Fe3O4/SGO (figure 2c-2d), the attendance of black points in above images confirmed the appearance of Fe3O4 NPs distributing among the GO layers with average size 12.53±1.75 nm as show in figure 2e. Moreover, figure 2c pointed out that TEM image of Fe3O4/SGO also had wrinkles as seen in figure 2a-2b, since the Fe3O4 NPs had connected to GO surface, therefore strengthened the magnetic property and also widen the distance among GO layers.…”

“…Moreover, the significant smaller peak intensity of Fe3O4/SGO material than two others have proved the association of Fe3O4 NPs and oxygen-containing group on pristine GO plate. [13] The XRD pattern in of GO in figure 1b showed peak at low angle 2θ = 9.47 o with dspace = 9.33 Å. In graphite, the inter layer separation was just about 3.33 Å, [14] but with the existence of oxygencontaining groups on graphite sheet, the C-C bonding broke down in the oxidation process and the interplanar distance was increased and lead to lower the value of 2θ.…”

Green-synthesis of superparamagnetic Fe3O4/alginate bio-nanocomposites for heavy metal contamination removal from industrial wastewater

“…A magnetic Fe 3 O 4 /graphene oxide nanocomposite material was synthzed and used for Pb 2+ removal from water samples by Thy et al (2020). The optimum Pb 2+ ions adsorption onto nanocomposite material conditions were performed by RSM combined with Box-Behnken design approach.…”

Modification of Lignocellulosic Materials with a Mixture of m-DMDHEU/Choline Chloride to Remove CrO42–, NO3–, and H2AsO4– in Aqueous Solution

“… 4 Graphene oxide was used as the support to magnetic iron oxide to form nanocomposite material, the material can separate effectively Cd(II) ions in aqueous solution. 5 Beside that, TiO 2 –SiO 2 -mixed oxide nanoparticles were developed as a heterogeneous photocatalysis, the material showed significantly higher methylene blue removal efficiency in comparison with that of the commercial TiO 2 material. 6 …”