Synthesis dynamics of graphite oxide

Bannov, Alexander G.; Manakhov, Anton; Shibaev, A. A.; Ukhina, Arina V.; Polčák, Josef; Максимовский, Е. А.

doi:10.1016/j.tca.2018.03.017

Cited by 21 publications

(12 citation statements)

References 46 publications

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“…The typical Raman shift for synthesised GO shown in Figure 2 b has two significant peaks; the D peak at 1600 cm −1 and the G peak at 1358 cm −1 caused by the stretching vibration of sp 2 , particularly the distortion of the carbon atom [ 36 ]. According to the Raman shift of the synthesised GO, the ratio of the D and G peak (ID/IG) of 0.89 is close to values from the literature using the same method to synthesised GO [ 37 , 38 ]. The ID/IG ratio has been widely used to determine the disorder and degree of graphitisation of carbonaceous materials.…”

Section: Resultssupporting

confidence: 79%

Graphene Oxide Incorporated Polysulfone Substrate for Flat Sheet Thin Film Nanocomposite Pressure Retarded Osmosis Membrane

et al. 2020

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This study focuses on the development of flat sheet thin film nanocomposite (TFN) pressure retarded osmosis (PRO) membranes for the enhancement of osmotic power generation by the incorporation of laboratory-synthesised graphene oxide (GO) into the polysulfone (PSf) polymer matrix. A series of membranes containing different weight percent of GO (0, 0.1, 0.25, 0.5 and 1.0 wt%) were fabricated via a phase inversion method with polyethylene glycol (PEG) as the pore forming agent. The results show that the TFN-0.25GO membrane has excellent water flux, salt reverse flux, high porosity and an enhanced microvoids morphology compared to the control membrane. The highest power density was achieved when TFN-0.25GO was used is 8.36 Wm−2 at pressure >15 bar. It was found that the incorporation of GO into the polymer matrix has significantly improved the intrinsic and mechanical properties of the membrane.

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Section: Resultssupporting

confidence: 79%

Graphene Oxide Incorporated Polysulfone Substrate for Flat Sheet Thin Film Nanocomposite Pressure Retarded Osmosis Membrane

et al. 2020

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“…The intensity of D bands increased with increasing potential due to the oxidation of CP. Notably, the G band is positively shifted from 1582 to 1590 cm −1 when the applied potential reaches to 2.7 V, which also confirms the variations on the properties of CP electrodes 48,49 . It should be noted that the CP electrode could be broken at potentials over 3.0 V. Since the 2 h‐ACP sample had the best electrochemical activity, it was selected for the in‐situ Raman study.…”

Section: Resultssupporting

confidence: 52%

Electrochemical conversion of valeric acid on carbon‐based materials

Gong

Shen

2022

Intl J of Energy Research

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Converting carboxylic acids into value-added products by electrochemical processes is of great interest. In this work, the electrochemical conversion of valeric acid (VA) on carbon materials including glassy-carbon (GC) electrodes and carbon-paper (CP) electrodes was studied. Owing to the porous structure, CP electrodes showed superior performance relative to GC electrodes. The surface properties of CP electrodes were modified via electro-oxidation processes. The structures of the CP electrodes were characterized by scanning electron microscopy, X-ray diffraction pattern, X-ray photoelectron spectroscopy spectra, and Raman spectra. It was found that the electrochemical activation process had more pronounced effects on electro-oxidation of VA than H 2 O. The onset potential of VA oxidation on electrochemically activated CP electrodes was negatively shifted and the current density was significantly improved. The products of VA oxidation by CP electrodes were determined by gas chromatography-mass spectra. VA was mainly transformed into 2-butanol, butyl valerate, and pentanoic acid 1-methylpropyl ester. The conversion of VA, Faraday efficiency, and product selectivity were determined. The optimal CP electrode exhibited the largest values of product selectivity (85.0%) and VA conversion (13.0%). In-situ Raman spectra were recorded to study the mechanism of VA oxidation on the CP electrodes. The oxidation of VA by CP electrodes follows the non-Kolbe route and the corresponding pathway was proposed.

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“…In this regard, two main oxidation processes have been observed during graphite oxidation, including the oxidation of surface carbon atoms and intercalated carbon atoms. 69 Accordingly, the different trends observed in Figure 5 are possibly due to the fact that surface carbon atoms have been shown to be easily oxidized, while the oxidation of intercalated carbons to CO 2 is difficult 70 because the carbon incorporated with oxygen is more readily oxidized. 53,71 In addition, the formation of M−COO− groups may play an important role for graphite oxidation because the absorption peak heights associated with these groups were observed to increase dramatically after 20 min of plasma S3).…”

Section: Resultsmentioning

confidence: 99%

Promotion Mechanism of CaSO₄ and Au in the Plasma-Assisted Catalytic Oxidation of Diesel Particulate Matter

Kong

Yao

et al. 2022

ACS Omega

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Plasma-assisted catalysis has been demonstrated to be an innovative technology for eliminating diesel particulate matter (DPM) efficiently at low temperature (≤200 °C). Moreover, past studies have demonstrated that CaSO 4 , which exists in small concentrations (<2%) in DPM and is toxic in thermal catalytic oxidation processes, actually enhances DPM oxidation during plasma-assisted catalytic processes. However, the role CaSO 4 plays in this promotion of DPM oxidation still remains unclear. The present study addresses this issue by investigating the underlying mechanisms of DPM oxidation during plasma-assisted catalytic processes using graphitic carbon as a surrogate DPM material in conjunction with CaSO 4 -and Au-impregnated γ-Al 2 O 3 catalysts. The results of mass spectrometry and in situ diffuse reflectance infrared Fourier transform spectroscopy, which employs an in situ cell with a small dielectric barrier discharge space over the catalyst bed, demonstrate that CaSO 4 can save and release O atoms contributing to graphite oxidation via the −SO units of CaSO 4 through a reversible surface reaction (−SO + O → −S(−O) 2 ). The results are employed to propose a formal mechanism of graphite oxidation catalyzed by CaSO 4 and Au. These findings both improve our understanding of the plasma-assisted catalytic oxidation mechanisms of DPM and support the development of efficient plasma-assisted catalysts.

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Synthesis dynamics of graphite oxide

Cited by 21 publications

References 46 publications

Graphene Oxide Incorporated Polysulfone Substrate for Flat Sheet Thin Film Nanocomposite Pressure Retarded Osmosis Membrane

Graphene Oxide Incorporated Polysulfone Substrate for Flat Sheet Thin Film Nanocomposite Pressure Retarded Osmosis Membrane

Electrochemical conversion of valeric acid on carbon‐based materials

Promotion Mechanism of CaSO₄ and Au in the Plasma-Assisted Catalytic Oxidation of Diesel Particulate Matter

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Synthesis dynamics of graphite oxide

Cited by 21 publications

References 46 publications

Graphene Oxide Incorporated Polysulfone Substrate for Flat Sheet Thin Film Nanocomposite Pressure Retarded Osmosis Membrane

Graphene Oxide Incorporated Polysulfone Substrate for Flat Sheet Thin Film Nanocomposite Pressure Retarded Osmosis Membrane

Electrochemical conversion of valeric acid on carbon‐based materials

Promotion Mechanism of CaSO4 and Au in the Plasma-Assisted Catalytic Oxidation of Diesel Particulate Matter

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Product

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Promotion Mechanism of CaSO₄ and Au in the Plasma-Assisted Catalytic Oxidation of Diesel Particulate Matter