Effects of Coal Rank and Macerals on the Structure Characteristics of Coal-Based Graphene Materials from Anthracite in Qinshui Coalfield

Thirteen raw coal samples from Qinshui coalfield were prepared to produce coal-based graphene, and the raw coal, coal-based graphite, and coal-based graphene sheets (GS) were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy with energy dispersive spectromete...

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Bibliographic Details
Published in:Minerals (Basel) 2022-05, Vol.12 (5), p.588
Main Authors: Li, Ruiqing, Tang, Yuegang, Che, Qili, Ma, Pengliang, Luo, Peng, Lu, Xin, Dong, Min
Format: Article
Language:English
Subjects:
Analytical methods
Anthracite
Carbon
Chemical vapor deposition
Coal
coal rank
coal-based graphene
coal-based graphite
Correlation
Crystallites
Crystals
Demineralizing
Electron microscopy
Graphene
Graphite
Graphitization
High resolution electron microscopy
Hydrocarbons
Immunoglobulins
inertinite
Interlayers
Macerals
Metamorphism
Oxidation
Oxidoreductions
Quantum dots
Raman spectroscopy
Raw materials
Reflectance
Scanning electron microscopy
Temperature
Transmission electron microscopy
vitrinite
X-ray diffraction
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Summary:Thirteen raw coal samples from Qinshui coalfield were prepared to produce coal-based graphene, and the raw coal, coal-based graphite, and coal-based graphene sheets (GS) were characterized by X-ray diffraction (XRD), Raman spectroscopy, scanning electron microscopy with energy dispersive spectrometer (SEM-EDS), and high-resolution transmission electron microscopy (HRTEM). The results show that the graphitization degree of coal-based graphite is positively linearly correlated with the reflectance of raw coal, has a low positive correlation with the content of inertinite, and has a low positive correlation with the content of vitrinite in raw coal. The crystallite width (La) and crystallite height (Lc) of coal-based graphite and graphene are positively linearly correlated with the reflectance of raw coal. La and Lc of coal-based graphite are distributed in 17.591–48.374 nm and 11.359–23.023 nm, respectively. After redox, La and Lc of coal-based graphene are distributed in 4.405 nm–6.243 nm and 0.804–1.144 nm, respectively. The defect degree (ID/IG) of coal-based graphene is higher than that of raw coal, demineralized coal, and coal-based graphite. The coal-based graphene is thin and transparent, and only contained carbon and oxygen. Combined with the parameters of XRD and HRTEM, it is calculated that the interlayer spacing (d002) of Qinshui-coal-based graphene is about 0.4007 nm and the number of layers (Nave) is about 5.
ISSN:2075-163X
2075-163X
DOI:10.3390/min12050588