“…In fact, graphene is considered an important material in wastewater treatment technologies because of its outstanding features 3 , 21 , 22 . Up to now, graphene and its derivatives are used as a matrix of metal/metal oxide materials to enhance the catalytic performance of materials, including Ni 19 –NiO 23 for dye-synthesized solar cell, CuO 24 for catalysts, Pd–Ag 25 and AuNPs/MoS 2 26 for the electrochemical sensor, TiO 2 27 and MoS 2 28 for electrode, AgBr 29 and Fe 3 O 4 30 for water purification, or water splitting 19 . Yuan et al suggested a new mechanism for the improvement of photocatalytic activities with graphene.…”
In this study, hematite graphene oxide (αFe2O3-GO) powder nanocomposites and thin-film hematite graphene oxide (αFe2O3-GO) were synthesized for application in the removal of Rhodamine B (RhB) from textile wastewater. αFe2O3-GO nanomaterials were placed onto the FTO substrate to form a thin layer of nanocomposites. Different analysis including XRD, FTIR, Raman spectra, XPS, and FESEM were done to analyze the morphology, structure, and properties of the synthesized composites as well as the chemical interactions of αFe2O3 with GO. The photocatalytic performance of two synthesized composites was compared with different concentrations of αFe2O3-GO. The results showed that powder nanocomposites are more effective than thin-film composites for the removal of RhB dye. αFe2O3-GO-5% powder nanocomposites removed over 64% of dye while thin-film nanocomposites had less removal efficiencies with just under 47% removal rate. The reusability test was done for both materials in which αFe2O3-GO-5% powder nanocomposites removed a higher rate of dye (up to 63%) in more cycles (6 cycles).
“…In fact, graphene is considered an important material in wastewater treatment technologies because of its outstanding features 3 , 21 , 22 . Up to now, graphene and its derivatives are used as a matrix of metal/metal oxide materials to enhance the catalytic performance of materials, including Ni 19 –NiO 23 for dye-synthesized solar cell, CuO 24 for catalysts, Pd–Ag 25 and AuNPs/MoS 2 26 for the electrochemical sensor, TiO 2 27 and MoS 2 28 for electrode, AgBr 29 and Fe 3 O 4 30 for water purification, or water splitting 19 . Yuan et al suggested a new mechanism for the improvement of photocatalytic activities with graphene.…”
In this study, hematite graphene oxide (αFe2O3-GO) powder nanocomposites and thin-film hematite graphene oxide (αFe2O3-GO) were synthesized for application in the removal of Rhodamine B (RhB) from textile wastewater. αFe2O3-GO nanomaterials were placed onto the FTO substrate to form a thin layer of nanocomposites. Different analysis including XRD, FTIR, Raman spectra, XPS, and FESEM were done to analyze the morphology, structure, and properties of the synthesized composites as well as the chemical interactions of αFe2O3 with GO. The photocatalytic performance of two synthesized composites was compared with different concentrations of αFe2O3-GO. The results showed that powder nanocomposites are more effective than thin-film composites for the removal of RhB dye. αFe2O3-GO-5% powder nanocomposites removed over 64% of dye while thin-film nanocomposites had less removal efficiencies with just under 47% removal rate. The reusability test was done for both materials in which αFe2O3-GO-5% powder nanocomposites removed a higher rate of dye (up to 63%) in more cycles (6 cycles).
“…19‐0629). [ 48 ] As shown in Figure 4c, in the XRD pattern of hybrid nanomaterials 1 , the appearance of new peaks at 2θ = 10.3°, 21.2°, 26.1°, and 35.4° confirms presence of phosphotungstic acid in the structure of hybrid nanomaterials 1 . [ 37–39 ] Furthermore, the peaks related to LaFeO 3 and Fe 3 O 4 have some red shift in the XRD pattern of hybrid nanomaterials 1 in comparison with bare nanomaterials.…”
Novel magnetic hybrid nanomaterials 1 (LaFeO3.Fe3O4@SiO2‐NH2/PW12) were synthesized by supporting phosphotungstic acid (H3PW12O40; PW12) on LaFeO3.Fe3O4 nanomaterials through sono‐assisted method. The synthesized nanomaterials were fully characterized by using FT‐IR, XRD, UV–vis, BET‐BJH, VSM, SEM, and TEM analyses. FT‐IR, XRD, and UV–vis confirmed successful synthesis of nanomaterials. The SEM and TEM images revealed spherical morphology with core‐shell structure for hybrid nanomaterials 1. VSM results confirmed the magnetic property of hybrid nanomaterials 1 and suggested it as easily recyclable photocatalyst for removal of organic dyes from aqueous solution. The photocatalytic activity of hybrid nanomaterials 1 has been studied over the degradation of methylene blue (MB) and methyl orange (MO) solution under UV–vis light irradiation. Importantly the hybrid nanomaterials 1 showed outstanding degradation efficiency for MB solution in comparison with bare LaFeO3.Fe3O4 and PW12. The photocatalytic activity was enhanced mainly due to the high efficiency in separation of electron–hole pairs induced by the remarkable synergistic effects of LaFeO3.Fe3O4 and PW12 semiconductors. After the photocatalytic reaction, the nanocomposite can be easily separated from the reaction solution and reused several times without loss of its photocatalytic activity. Trapping experiments indicated that hole (hVB+) and •OH radicals were the main reactive species for dye degradation in the present photocatalytic system. On the basis of the experimental results and estimated band gaps, the mechanism for the enhanced photocatalytic activity was proposed.
“…According to Fig. 4 , the XRD pattern of the nanocomposite clearly shows the characteristic 2θ peaks of Fe 3 O 4 at 30.2°, 35.52°, 43.5°, 54, 57° and 63° are attributed to the crystal planes of magnetite at 220, 311, 400, 422, 511 and 440, respectively 50 . Figure 3 TGA diagram of Pip@MGO nanocomposite.…”
In this research, the piperazine-modified magnetic graphene oxide (Pip@MGO) nanocomposite was synthesized and utilized as a nano-adsorbent for the removal of Pb(II) ions from environmental water and wastewater samples. The physicochemical properties of Pip@MGO nanocomposite was characterized by X-ray diffraction analysis (XRD), Field emission scanning electron microscopy (FESEM), Transmission electron microscopy (TEM), Energy-dispersive X-ray spectroscopy (EDAX), Thermo-gravimetric analysis (TGA), Vibrating Sample Magnetometery (VSM) and Fourier-transform infrared spectroscopy (FT-IR) analysis. In this method, the batch removal process were designed by response surface methodology (RSM) based on a central composite design (CCD) model. The results indicated that the highest efficiency of Pb(II) removal was obtained from the quadratic model under optimum conditions of prominent parameters (initial pH 6.0, adsorbent dosage 7 mg, initial concentration of lead 15 mg L−1 and contact time 27.5 min). Adsorption data showed that lead ions uptake on Pip@MGO nanocomposite followed the Langmuir isotherm model equation and pseudo-second order kinetic model. High adsorption capacity (558.2 mg g−1) and easy magnetic separation capability showed that the synthesized Pip@MGO nanocomposite has great potential for the removal of Pb(II) ions from contaminated wastewaters.
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