Magnetic MnFe 2 O 4 –graphene hybrid composite for efficient removal of glyphosate from water

Yamaguchi, Natália Ueda; Bergamasco, Rosângela; Hamoudi, Safia

doi:10.1016/j.cej.2016.03.051

Cited by 261 publications

(131 citation statements)

References 57 publications

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“…On the other hand, for MnFe 2 O 4 /GAs, the characteristic peak of GO at 1730 cm −1 shifted to 1558 cm −1 , implying that the MnFe 2 O 4 particles were strongly adsorbed onto the GO surface by chemical reduction . From the FTIR spectrum of MnFe 2 O 4 /GAs, the vibration peaks of the most oxygen‐containing group disappeared, indicating that GO reduced during the hydrothermal and self‐assembly processes; this agrees with the XRD result …”

Section: Resultssupporting

confidence: 84%

Synthesis and Evaluation of Graphene Aerogel‐Supported Mn_xFe_3−xO₄ for Oxygen Reduction in Urea/O₂ Fuel Cells

et al. 2019

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Graphene aerogel‐supported manganese ferrite (Mn x Fe 3−x O 4 /GAs) and reduced‐graphene oxide/manganese ferrite composite (MnFe 2 O 4 /rGO) were synthesized and studied as cathode catalysts for oxygen reduction reactions in urea/O 2 fuel cells. MnFe 2 O 4 /GAs exhibited a 3D framework with a continuous macroporous structure. Among the investigated Fe/Mn ratios, the more positive oxygen reduction onset potential was observed with Fe/Mn=2/1. The half‐wave potential of MnFe 2 O 4 /GAs was considerably more positive than that of MnFe 2 O 4 /rGO and comparable with that of Pt/C, while the stability of MnFe 2 O 4 /GAs significantly higher than that of Pt/C. The best urea/O 2 fuel cell performance was also observed with the MnFe 2 O 4 /GAs. The MnFe 2 O 4 /GAs exhibited an OCV of 0.713 V and a maximum power density of 1.7 mW cm −2 at 60 °C. Thus, this work shows that 3D structured graphene aerogel‐supported MnFe 2 O 4 catalysts can be used as an efficient cathode material for alkaline fuel cells.

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Section: Resultssupporting

confidence: 84%

Synthesis and Evaluation of Graphene Aerogel‐Supported Mn_xFe_3−xO₄ for Oxygen Reduction in Urea/O₂ Fuel Cells

et al. 2019

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“…Thermodynamic studies can be used to determine the energy changes in the adsorption process and have a strong guiding significance for practical applications. The standard Gibb's free energy change (▵G°), the average standard enthalpy change (▵H°) and entropy change (▵S°) can be calculated by the following Equation (5) and Van't Hoff equation (Equation (6)):

true Δ G^{\circ} = - RTln K_{c}

true \ln K_{c} = \frac{Δ normalS^{\circ}}{R} - \frac{Δ normalH^{\circ}}{RT}

…”

Section: Resultsmentioning

confidence: 99%

Removal of Cr(VI) from Wastewater by a Novel Adsorbent of Magnetic Goethite: Adsorption Performance and Adsorbent Characterisation

Liu

Chen

et al. 2019

ChemistrySelect

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A novel adsorbent of magnetic goethite was prepared by neutralisation hydrolysis and employed for Cr(VI) adsorption from aqueous solution. The magnetic goethite adsorbent was characterised by using scanning electron microscopy (SEM), X‐ray diffractometer (XRD), vibrating sample magnetometer (VSM), fourier transform infrared (FTIR), brunauer‐Emmett‐Teller (BET) and X‐ray photoelectron spectroscopy (XPS) method. VSM showed that the prepared adsorbents are super‐paramagnetic iron hydroxide. FTIR spectra revealed that magnetic goethite have ‐OH and other functional groups. The effects of various factors, including pH, adsorbent dosage, initial concentration, and ion concentration, were evaluated. Under the conditions of pH 3, 4 g/L magnetic goethite, 20 mg/L Cr(VI) concentration, and 0.01 mol/L NaNO3, the removal efficiency of Cr (VI) reached 88.2% and the adsorption capacity of the adsorbent reached 4.32 mg/g. The adsorption kinetic tests showed that the adsorption of Cr(VI) on the adsorbent matched well with pseudo‐second‐order kinetics, indicating the occurrence of chemisorption. The fitting of the Langmuir isotherm model showed that the adsorption of Cr(VI) on magnetic goethite was monolayer adsorption. On the other hand, thermodynamic studies conjectured that the adsorption processes of magnetic goethite for Cr(VI) was endothermic and spontaneous. These results suggest that magnetic goethite has great potential for the removal of heavy metals from wastewater.

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“…b. The diffraction peaks of MnFe 2 O 4 nanoparticles at 2 θ = 18.29, 30.13, 35.42, 36.48, 43.08, 53.55, 57.03, 62.58 and 74.03° were assigned to the (111), (220), (311), (222), (400), (422), (511), (440) and (533) crystal planes of MnFe 2 O 4 (JCPDS 10‐0319) respectively. Since the carbon base generated by the pyrolysis of chitosan was amorphous carbon, no related peak appeared in the CM‐500, CM‐600 and CM‐700 catalyst patterns .…”

Section: Resultsmentioning

confidence: 99%

Efficient degradation of Acid Orange 7 by persulfate activated with a novel developed carbon‐based MnFe₂O₄ composite catalyst

Liu

et al. 2019

J of Chemical Tech & Biotech

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BACKGROUND A novel carbon‐based modified MnFe2O4 catalyst was first developed to produce sulfate radicals (SO4−•) by activation of persulfate (PS). The catalyst was fabricated with a mixture of MnFe2O4 nanoparticles and chitosan (which could form a large amount of carbon‐based biomass after pyrolysis) annealed at 600 °C and was referred to as CM‐600. RESULTS The microstructure of the composite catalyst CM‐600 showed that MnFe2O4 was supported on the surface of carbon‐based sheets. After modification by pyrolysis, the specific surface area of MnFe2O4 enlarged significantly and thus the contact area between catalyst and PS increased. X‐ray diffraction, Fourier transform infrared spectroscopy, Raman spectroscopy and X‐ray photoelectron spectroscopy were used to characterize the components of CM‐600. In comparison with the MnFe2O4/PS system, the activation of PS by CM‐600 was enhanced prominently, while 99.0% Acid Orange 7 (AO7) removal was achieved after reacting for 30 min. Investigations of influencing factors indicated the optimal treatment parameters. The two reactive species in the degradation process, namely free radicals (SO4−• and hydroxyl radicals (•OH)) and non‐radicals (singlet oxygen, 1O2), were confirmed by quenching tests and electron spin resonance spectroscopy. The corresponding degradation mechanism was proposed and SO4−• was generated primarily via the activation of PS by MnII and FeII. CONCLUSION The research demonstrated that the composite catalyst CM‐600 improved the property of MnFe2O4 for catalyzing PS and thus enlarged the practical application of SO4−• oxidation technology in pollutant degradation in aqueous environments. © 2019 Society of Chemical Industry

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Magnetic MnFe 2 O 4 –graphene hybrid composite for efficient removal of glyphosate from water

Cited by 261 publications

References 57 publications

Synthesis and Evaluation of Graphene Aerogel‐Supported Mn_xFe_3−xO₄ for Oxygen Reduction in Urea/O₂ Fuel Cells

Synthesis and Evaluation of Graphene Aerogel‐Supported Mn_xFe_3−xO₄ for Oxygen Reduction in Urea/O₂ Fuel Cells

Removal of Cr(VI) from Wastewater by a Novel Adsorbent of Magnetic Goethite: Adsorption Performance and Adsorbent Characterisation

Efficient degradation of Acid Orange 7 by persulfate activated with a novel developed carbon‐based MnFe₂O₄ composite catalyst

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Magnetic MnFe 2 O 4 –graphene hybrid composite for efficient removal of glyphosate from water

Cited by 261 publications

References 57 publications

Synthesis and Evaluation of Graphene Aerogel‐Supported MnxFe3−xO4 for Oxygen Reduction in Urea/O2 Fuel Cells

Synthesis and Evaluation of Graphene Aerogel‐Supported MnxFe3−xO4 for Oxygen Reduction in Urea/O2 Fuel Cells

Removal of Cr(VI) from Wastewater by a Novel Adsorbent of Magnetic Goethite: Adsorption Performance and Adsorbent Characterisation

Efficient degradation of Acid Orange 7 by persulfate activated with a novel developed carbon‐based MnFe2O4 composite catalyst

Contact Info

Product

Resources

About

Synthesis and Evaluation of Graphene Aerogel‐Supported Mn_xFe_3−xO₄ for Oxygen Reduction in Urea/O₂ Fuel Cells

Synthesis and Evaluation of Graphene Aerogel‐Supported Mn_xFe_3−xO₄ for Oxygen Reduction in Urea/O₂ Fuel Cells

Efficient degradation of Acid Orange 7 by persulfate activated with a novel developed carbon‐based MnFe₂O₄ composite catalyst