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

Abstract

In this study, the PMo 12 O 40 3− polyanion was immobilized chemically on amino functionalized magnetic graphene oxide nanosheets. The as-prepared ternary magnetic nanocomposite (Fe 3 O 4 /GO-NH 2 /H 3 PMo 12 O 40 ) was characterized by powder X-ray powder diffraction (XRD), fourier transformation infrared spectroscopy (FTIR), Raman spectroscopy, energy dispersive spectroscopy (EDX), field emission scanning electron microscopy (FESEM), BET surface area measurements, magnetic measurements (VSM) and atomic force microscopy (AFM). The results demonstrated the successful loading of H 3 PMo 12 O 40 (~36.5 wt.%) on the surface of magnetic graphene oxide. The nanocomposite showed a higher specific surface area (77.07 m 2 /g) than pure H 3 PMo 12 O 40 (≤10 m 2 /g). The adsorption efficiency of this nanocomposite for removing methylene blue (MB), rhodamine B (RhB) and methyl orange (MO) from aqueous solutions was evaluated. The nanocomposite showed rapid and selective adsorption for cationic dyes from mixed dye solutions. The adsorption rate and capacity of Fe 3 O 4 /GO-NH 2 /H 3 PMo 12 O 40 were enhanced as compared with GO, GO-NH 2 , Fe 3 O 4 /GO-NH 2 , and H 3 PMo 12 O 40 samples due to enhanced electrostatic attraction and hydrogen-bonding interactions. The nanocomposite is magnetically separated and reused without any change in structure. Thus, it could be a promising green adsorbent for removing organic pollutants in water.

Ionic Liquid Supported on Magnetic Graphene Oxide as a Highly Efficient and Stable Catalyst for the Synthesis of Triazolopyrimidines

“…Therefore, it could be a promising candidate as an advantageous support for the immobilization of ILs. [23][24][25][26][27] ILs on graphene oxide supports have advantages due to their physicochemical properties; nevertheless, it is the tedious and time-consuming separation procedures that limit their practical applications. In this context, the development of magnetic graphene oxide as a support material has shown promise.…”

K6P2W18O62 encapsulated into magnetic Fe3O4/MIL-101 (Cr) metal–organic framework: a novel magnetically recoverable nanoporous adsorbent for ultrafast treatment of aqueous organic pollutants solutions

“… 19 However, there are some disadvantages for the use of POMs as adsorbents: (i) their relatively small surface area seriously obstructs accessibility to the active sites and (ii) their excellent solubility in aqueous solution determines that they cannot be reused and recycled in the process of wastewater treatment. 20 Hence, these difficulties in collection and recycling currently impede their further application. Therefore, to resolve this problem and also to maintain the polyoxometalate, magnetic adsorbents have attracted our attention and magnetic MOFs have been used to anchor POMs to create hybrid heterogeneous materials.…”

Synthesis and Characterization of Sulfonated Magnetic Graphene-Based Cation Exchangers for the Removal of Methylene Blue from Aqueous Solutions

“…In MGO and SMGO, there is no characteristic diffraction peak associated with GO, implying that when functionalizing with the nanoparticle, the magnetic graphene sheet does not stack. This may be due to the incorporated Fe 3 O 4 nanoparticles on the GO surface that prevent the exfoliated foil from restacking . Another reason may be the presence of magnetite and the weak carbon peaks submerged by the strong diffraction peak of iron oxide due to the reduction of the graphene sheet in the presence of the Fe 3 O 4 caused more likely by monolayer graphene, thus showing weak peaks …”

“…This may be due to the incorporated Fe 3 O 4 nanoparticles on the GO surface that prevent the exfoliated foil from restacking. 33 Another reason may be the presence of magnetite and the weak carbon peaks submerged by the strong diffraction peak of iron oxide due to the reduction of the graphene sheet in the presence of the Fe 3 O 4 caused more likely by monolayer graphene, thus showing weak peaks. 34 In Raman spectra, the peaks at 1350 and 1590 cm −1 demonstrate the D and G bands of the carbon phase (Figure 1b).…”