FTIR analysis aided identification of the functional groups present
in the samples and revealed how the composition and structure
of the banana fibers changed along the treatments. Fig. 6
contains the FTIR spectrum of the banana peel bran and CNFs.
The large absorption band in the region of 3650e3000 cm1
referred to eOH groups and represented the hydrophilicity of the
natural fibers (bran) and CT- and ET-treated CNFs. The peak at
3337 cm1 corresponded to eOH stretching; this band was related
to specific intramolecular hydrogen bonds of cellulose II (Yang, Yan,
Chen, Lee, & Zheng, 2007; Zuluaga et al., 2009). The bran displayed
a small band in the region of 2920 cm1, typical of the stretching
vibrations of the CeH bonds in hemicelluloses and cellulose. This
peak became more intense in the spectra of the treated CNFs
samples.
FTIR analysis aided identification of the functional groups present
in the samples and revealed how the composition and structure
of the banana fibers changed along the treatments. Fig. 6
contains the FTIR spectrum of the banana peel bran and CNFs.
The large absorption band in the region of 3650e3000 cm1
referred to eOH groups and represented the hydrophilicity of the
natural fibers (bran) and CT- and ET-treated CNFs. The peak at
3337 cm1 corresponded to eOH stretching; this band was related
to specific intramolecular hydrogen bonds of cellulose II (Yang, Yan,
Chen, Lee, & Zheng, 2007; Zuluaga et al., 2009). The bran displayed
a small band in the region of 2920 cm1, typical of the stretching
vibrations of the CeH bonds in hemicelluloses and cellulose. This
peak became more intense in the spectra of the treated CNFs
samples.
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