Synthesis of nano‐sized magnetite mesoporous carbon for removal of Reactive Yellow dye from aqueous solutions

Abstract

In this study, core‐shell structures of magnetite nanoparticles coated with CMK‐8 ordered mesoporous carbon (Fe3O4@SiO2‐CMK‐8 NPs) have been successfully synthesized for the first time by carbonizing sucrose inside the pores of the Kit‐6 mesoporous silica. The nano‐sized mesoporous particles were characterized by X‐ray diffraction, Fourier transform‐infrared spectroscopy, scanning electron microscope, dynamic light scattering, vibrating‐sample magnetometer, Brunauer–Emmett–Teller (BET) and transmission electron microscopy instruments. The obtained nanocomposite was used for removal of Reactive Yellow 160 (RY 160) dye from aqueous samples. The N2 adsorption–desorption method (at 77 K) confirmed the mesoporous structure of synthesized Fe3O4@SiO2‐CMK‐8 NPs. Also, the surface area was calculated by the BET method and Langmuir plot as 276.84 m2/g and 352.32 m2/g, respectively. The surface area, volume and pore diameter of synthesized nanoparticles (NPs) were calculated from the pore size distribution curves using the Barrett–Joyner–Halenda formula (BJH). To obtain the optimum experimental variables, the effect of various experimental parameters on the dye removal efficiency was studied using Taguchi orthogonal array experimental design method. According to the experimental results, about 90.0% of RY 160 was removed from aqueous solutions at the adsorbent amount of 0.06 g, pH 3 and ionic strength = 0.05 m during 10 min. The pseudo‐second order kinetic model provided a very good fit for the RY 160 dye removal (R2 = 0.999). The Langmuir, Freundlich, Temkin and Dubinin–Radushkevich models were applied to describe the equilibrium isotherms, and the Langmuir isotherm showed the best fit to data with the maximum adsorption capacity of 62.893 mg/g. Furthermore, the Fe3O4@SiO2‐CMK‐8 NPs could be simply recovered by external magnet, and exhibited recyclability and reusability for a subsequent six runs.

Removal of Hazardous Contaminants from Water by Natural and Zwitterionic Surfactant-modified Clay

“…Raising the pH i to ≥5 reduces the protonation of the functional groups on the surface of CAPB-NC 2‑60‑3 ; consequently, repulsion between the anionic RY160 and the surface functional groups of CAPB-NC 2‑60‑3 takes place and leads to a sharp reduction in R %. This result agrees with the previously published literature …”

Removal of reactive yellow 160 from aqueous solution by alumina nanoparticles derived from aluminium waste residue

“…Meanwhile the adsorption decreased with increasing pH in basic medium due to the repulsion and competition between the negatively charged functional group of the dye and the hydroxyl group of the basic medium. These results agree with the previous data in literature [28].…”

Design and synthesis of Fe3O4@SiO2@KIT-6@DTZ-Pd0 as a new and efficient mesoporous magnetic catalyst in carbon–carbon cross-coupling reactions

“…The corresponding peaks at 2θ = 39.91°, 45.16° and 66.86° 2θ is correspondence to Pd particles. These pieces of evidence show that Pd is well stabilized on the nanocatalyst 36 , 37 .

Figure 4 The XRD pattern of the Fe 3 O 4 @SiO 2 @KIT-6@DTZ-Pd 0 .

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