Preparation and characterization of colloidal dispersions of graphene-like structures from different ranks of coals
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Abstract: This paper focuses on preparation of colloidal solution of graphene-like structures from different ranks of coals: brown coal, bituminous coal, low-volatile bituminous coal, anthracite. It was found that brown coal thermo-oxidative destruction leads to formation of small d=32 nm (V=17%) and large d=122 nm (V=11%) fractions of nanoparticles. The thermo-oxidative destruction of bituminous coal leads to formation of nanoparticles d=50 nm (V=5.2%) and d=164 nm (V=16%). Thermo-oxidative destruction of low-volatile bituminous coal and anthracite leads to formation of nanoparticles, predominantly, d=122-190 nm. Carbon nanostructures obtained from coal are negatively charged at pH=2-12. Colloidal solution of carbon nanostructures at dispersed phase concentration 0.01 mg/mL is stable for 1 month. Electron diffraction patterns and X-ray analysis of carbon nanostructures showed that nanostructure from brown coal is amorphous and nanostructure from anthracite is crystalline. Results of coal macromolecules modeling and graphene-like structures obtained from them are presented.
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Figure 2 TEM images of carbon nanostructures from different ranks of coals
(a): coal B, (b): coal G, (c): coal T, (d): coal A
Figure 3 X-ray diffraction patterns of coal (a) and carbon nanostructures(b) a: coal B; b: coal G; c: coal T; d: coal A; e: graphite
Figure 4 FT-IR spectra of coals (a) and carbon nanostructures (b)
a: coal B; b: coal G; c: coal T; d: coal A; e: graphite
Figure 5 Differential curves of carbon nanoparticles size distribution
(a): coal B; (b): coal G; (c): coal T; (d): coal A
Figure 6 Electrokinetic potential of coal particles and carbon nanostructures
(a): coal B; (b): coal G; (c): coal T; (d): coal A
Figure 7 Structural fragments of coal macromolecules
(a): coal B; (b): coal G; (c): coal T; (d): coal A
Figure 8 Schematic representation of graphene-like structures produced from coal
(a): coal B; (b): coal G; (c): coal T; (d): coal A
Table 1 Proximate and ultimate analyses of coal
Table 2 Structural and sorption characteristics of coal
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