The aim of this study was to evaluate the production potential of cellulose nanofibers from two different
industrial bio-residues: wastes from the juice industry (carrot) and the beer brewing process (BSG). The
mechanical separation of the cellulose nanofibers was by ultrafine grinding. X-ray diffraction (XRD) and
Raman spectroscopy revealed that the materials were mechanically isolated without significantly affecting
their crystallinity. The carrot residue was more easily bleached and consumed less energy during
grinding, using only 0.9 kWh/kg compared to 21 kWh/kg for the BSG. The carrot residue also had a 10%
higher yield than the BSG. Moreover, the dried nanofiber networks showed high mechanical properties,
with an average modulus and strength of 12.9 GPa and 210 MPa, respectively, thus indicating a homogeneous
nanosize distribution. The study showed that carrot residue has great potential for the industrial
production of cellulose nanofibers due to its high quality, processing efficiency, and low raw material
cost.
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