Kadem MERAL, Önder METİN

Graphene oxide--magnetite nanocomposite as an efficient and magnetically separable adsorbent for methylene blue removal from aqueous solution

We report a facile method to produce a magnetically separable graphene oxide--magnetite nanocomposite (GO--Fe3O4) and its adsorption performance in methylene blue (MB) removal from aqueous solution. The GO--Fe3O4 nanocomposite was synthesized by a solution-phase self-assembly method including the incorporation of monodisperse Fe3O4 nanoparticles (NPs) and GO in a dimethylformamide/chloroform mixture under sonication. The successfully decorating GO sheet with monodisperse Fe3O4 NPs was proved by TEM study. ICP--OES data of the GO--Fe3O4 nanocomposite show that the GO--Fe3O4 nanocomposite consists of 21 wt% Fe3O4 NPs, which is sufficient for its magnetic separation from aqueous solution. The spectroscopic studies reveal that the GO--Fe3O4 nanocomposite is a highly efficient adsorbent for MB removal from aqueous solution, providing an adsorption capacity of 172.6 mg/g, and the equilibrium for MB adsorption is attained in \sim 70 min. Moreover, it is a magnetically separable and reusable material for MB removal from water, preserving 87% of its initial efficiency after 5 successive runs.

Anahtar Kelimeler:

Graphene oxide, Fe3O4 nanoparticles, composite sorbent, magnetic separation, dye removal, methylene blue

Graphene oxide--magnetite nanocomposite as an efficient and magnetically separable adsorbent for methylene blue removal from aqueous solution

Keywords:

Graphene oxide, Fe3O4 nanoparticles, composite sorbent, magnetic separation, dye removal, methylene blue,

PDF

___

[this work] [27] [28] [29] [30]
Figure 4. (A) TEM image of the GO–Fe3O4hybrid composite after adsorption of MB, (B) the reusability of the GO–Fe3O4composite in the MB removal from aqueous solution for 5 successive runs. ([GO–Fe3O4] = 0.6 g/L and [MB] = 13 mg/L).
Experimental section 3.1. Materials
Iron(III) acetylacetonate (Fe(acac)3,≥99.9%), oleylamine (OAm, >70%), benzyl ether (BE, 98%) potassium permanganate (KMnO4,
≥9%), potassium peroxodisulfate (K2S2O8,≥99.9%), phosphorous pentaoxide (P2O5,≥98%), hydrogen peroxide (H
, 30%), sodium nitrate (NaNO3,≥99.9%), sulfuric acid (H2SO, 98%), N,N-dimethylformamide (DMF, 99.8%), and methylene blue (MB) were purchased from Sigma-Aldrich. Natural graphite flakes (average particle size 325 mesh) were purchased from Alfa Aesar. All chemicals were used without any further purification. Deionized water was distilled by water purification system (Milli-Q System).
Characterization
Synthesis of GO–Fe3O4nanocomposite
The dye adsorption experiments were carried out in round bottom flasks at room temperature. In a typical experiment, 25 mL of aqueous solution of MB with a known initial concentration was mixed with 25 mg of the GO–Fe3O4nanocomposite well-dispersed in water via sonication. The resultant mixture was shaken for 24 h at pH
∼ Next, the GO–Fe3O4
(1) where qe is the concentration of dye adsorbed (mg/g), Coand Ceare the initial and equilibrium concentrations of dye (mg/L), m is the mass of the GO–FeO4(g), and V is the volume of solution (L).11,17The adsorption experiment was also performed at different pH values by adjusting pH via use of HCl and NaOH. References