Sweet sorghum bagasse represents a potential
low-cost biomass which can be valorized to produce different
value-added lignocellulosic platform chemicals of
economic importance. The focus of the present study is the
pretreatment of sweet sorghum bagasse for efficient delignification,
separation of pure cellulose and its structural
characterization. Sweet sorghum bagasse was subjected to
mechanical commutation followed by steam washing,
organosolv extraction (methanol and toluene, 1:2) and
alkaline hydrogen peroxide treatment for efficient delignification.
Chemical analysis revealed that cellulose,
hemicellulose and lignin content (per cent recovered) after
different pretreatment was 720 g (98 %), 6 g (1.1 %) and
20 g (0.9 %), respectively. Structural characterization of
untreated sweet sorghum bagasse and recovered cellulose
was performed using FT-IR, CP-MAS 13C NMR spectroscopy,
XRD, and thermogravimetric analyses. The cellulose
preparation obtained after chemical pretreatments
had typical cellulose structure with high crystallinity as
compared to the untreated substrate. SEM micrographs
revealed the surface topography wherein the waxy layer on
the surface of this material disappeared and the texture
became thinner and striated. The pretreatment methods
employed were able to produce cellulose of high purity
with[98 % lignin removal.
Sweet sorghum bagasse represents a potentiallow-cost biomass which can be valorized to produce differentvalue-added lignocellulosic platform chemicals ofeconomic importance. The focus of the present study is thepretreatment of sweet sorghum bagasse for efficient delignification,separation of pure cellulose and its structuralcharacterization. Sweet sorghum bagasse was subjected tomechanical commutation followed by steam washing,organosolv extraction (methanol and toluene, 1:2) andalkaline hydrogen peroxide treatment for efficient delignification.Chemical analysis revealed that cellulose,hemicellulose and lignin content (per cent recovered) afterdifferent pretreatment was 720 g (98 %), 6 g (1.1 %) and20 g (0.9 %), respectively. Structural characterization ofuntreated sweet sorghum bagasse and recovered cellulosewas performed using FT-IR, CP-MAS 13C NMR spectroscopy,XRD, and thermogravimetric analyses. The cellulosepreparation obtained after chemical pretreatmentshad typical cellulose structure with high crystallinity ascompared to the untreated substrate. SEM micrographsrevealed the surface topography wherein the waxy layer onthe surface of this material disappeared and the texturebecame thinner and striated. The pretreatment methodsemployed were able to produce cellulose of high puritywith[98 % lignin removal.
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