Hydrothermal preparation of carbon microspheres from mono-saccharides and phenolic compounds
- Hydrothermal preparation of carbon microspheres from mono-saccharides and phenolic compounds
- 류지혜; 서영웅; 서동진; 안동준
- Issue Date
- VOL 48, NO 7, 1990-1998
- Isolated carbon microspheres in a diameter range of 1–4 lm were prepared by hydrothermal
treatment of mono-saccharides (xylose for pentose and fructose for hexose) with phenolic
compounds–phenol, resorcinol, and phloroglucinol. It was found that addition of
these compounds, particularly phloroglucinol, into a sugar solution led to a substantial
increase (roughly 20-fold) of the carbon yield. Mono-saccharides are dehydrated into furan
compounds during hydrothermal carbonization, and these compounds subsequently react
with phloroglucinol, as revealed by examination of high-performance liquid chromatograms.
Through elemental analysis and spectroscopic studies, it was found that several
oxygen functionalities including hydroxyl, carbonyl, carboxyl, ether, quinone, and ester
groups were located throughout the carbon spheres derived from sugars and phloroglucinol.
On the basis of the carbon formation mechanism, the C–O–C bond formed by linkage
of OH groups of phenolic compounds preferentially exists at the core of carbon spheres
whereas the outer carbon surface contains reactive oxygen functionalities such as hydroxyl,
carbonyl, carboxylic, and ester groups, corresponding with results obtained with sugarderived
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