1 research outputs found
Effects of Cellulose, Hemicellulose, and Lignin on the Structure and Morphology of Porous Carbons
Porous
carbon materials stemming from biomass have drawn increasing
interest because of their sustainable properties. Cellulose, hemicellulose,
and lignin are the three basic components of crude biomass, and were
investigated to reveal their influence on the derived carbonaceous
materials. Huge amounts of oxygen-containing functional groups in
cellulose and hemicellulose tend to be eliminated as H<sub>2</sub>O, CO<sub>2</sub>, and CO and give micropores during pyrolysis, whereas
lignin contains plentiful aromatic units which are chemically inert,
and thus produce nonporous carbon materials. When the KHCO<sub>3</sub> was introduced during the pyrolysis process, the plentiful hydroxyl
in cellulose and hemicellulose underwent dehydration condensation
among different parent polymers, which are responsible for the formation
of macroporous structure. By contrast, The β-O-4 bands in lignin
experience homolysis and give rise to benzene-containing units, which
finally result in carbon nanosheets. Furthermore, we demonstrated
the mixture of cellulose, hemicellulose, and lignin can display a
three-dimensional porous structure (containing macropores, mesopores,
and micropores) when less than 50% of lignin is contained