FTIR spectroscopy and X-ray powder diffraction characterization of microcrystalline cellulose obtained from alfa fibers

Khimeche, Kamel; Debenath, André; Benelmir, Riad

doi:10.1051/matecconf/20130301023

Cited by 12 publications

(10 citation statements)

References 5 publications

(4 reference statements)

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“…The absorption peak at 1430 cm − 1 is associated to crystalline band, which is referred to CH 2 symmetric stretching [37,54], the increased of this peak in alfa cellulose and alfa-MCC indicates the removal of the amorphous regions. Following to literature and the obtained results, it can be deduced that the different cellulosic samples are effectively isolated, whatever the delignification process used [13,23,55]. In addition, the produced MCCs from alfa grass using hydrochloric acid hydrolysis have identical chemical composition as that obtained in the literature [13].…”

Section: Ftir Spectroscopysupporting

confidence: 59%

“…3 and the calculated data reported in Table 2, it is obvious that the crystallinity indexes of microcrystalline cellulose samples have higher values compared to their respective native cellulose samples. This finding is referred to the degradation of the amorphous parts during the acid hydrolysis [9,54,55,58]. Moreover, the cellulose and MCC samples prepared with the combined delignification method showed the highest crystallinity indexes in comparison with those prepared via the totally free chlorine process and acidified chlorite method, respectively.…”

Section: Crystalline Structure Analysismentioning

confidence: 99%

“…The thermal stability of cellulose and microcrystalline cellulose materials are crucial to estimate their performance and their use in several industries. The thermal properties were investigated using DSC and TGA/ DTG analyses [23,55,66,67]. The thermal parameters of all cellulose samples are reported in Table 2.…”

Section: Thermal Stabilitymentioning

confidence: 99%

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Physicochemical Properties and Thermal Stability of Microcrystalline Cellulose Isolated from Esparto Grass Using Different Delignification Approaches

et al. 2020

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Esparto grass, known as alfa, is a renewable biomass widely distributed in southern and western Mediterranean basin. The present work focused on the isolation of pure cellulose from alfa stems, via different approaches, i.e., acidified sodium chlorite (NaClO 2), totally chlorine free (TCF) or their combination, followed by the preparation of microcrystalline cellulose (MCC) using acid hydrolysis method. The obtained samples were characterized using infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM), thermogravimetry (TGA) and differential scanning calorimeter (DSC). The FTIR spectroscopy exhibited the removal of lignin and hemicellulose after the delignification and alkaline treatments. The XRD data showed that all of the MCCs have higher crystallinity indexes (Alfa-MCC 73-82%) and belong to cellulose I type. From SEM images, it is clear that the different MCC particles presented rough surface and micro-sized particles. The DSC/ TGA analyses revealed that MCC samples present better thermal stability than their respective cellulose ones, with higher temperature of decomposition (more than 350 °C). Moreover, the use of a combined process yields to MCC with higher crystallinity and better thermal stability. Consequently, based on these findings, the delignification with combined method can be considered as a promising approach to extract MCC from alfa fibers with outstanding features.

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Section: Ftir Spectroscopysupporting

confidence: 59%

Section: Crystalline Structure Analysismentioning

confidence: 99%

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Physicochemical Properties and Thermal Stability of Microcrystalline Cellulose Isolated from Esparto Grass Using Different Delignification Approaches

et al. 2020

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“…These two prominent peaks are more intense in the case of BAW and CNC samples, indicating that more cellulose content was exposed in these samples after bleaching and acid hydrolysis treatments [40]. Additionally, the peak at 899 cm -1 remained unchanged in all CNC samples (CNC30, CNC40 and CNC80) indicating that the β-D-glucopyranosyl structure in cellulose chains was not affected after sulfuric acid hydrolysis, even at long hydrolysis time (CNC80).…”

Section: Ftir Analysis Of Cellulosic Materialsmentioning

confidence: 92%

Reuse of red algae waste for the production of cellulose nanocrystals and its application in polymer nanocomposites

Achaby

Kassab

Aboulkas

et al. 2018

International Journal of Biological Macromolecules

173

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phone (+2126) 620 10 620 Highlights  Cellulose nanocrystals (CNC) were successfully extracted from red algae waste  CNC exhibit a needle-like shape and a diameter of 5-9 nm, and a length of 289-315 nm  PVA nanocomposite films with different CNC contents were prepared by solvent-casting  Nanocomposites with high mechanical performance and good transparency were obtaine Version postprintComment citer ce document : El Achaby, M., Kassab, Z., Aboulkas, A., Gaillard, C., AbstractRed algae is widely available around the world and its exploitation for the production of agar products has become an important industry in recent years. The industrial processing of red algae generates a large quantity of solid fibrous wastes, which constitutes a source of serious environmental problems. In the present work, the utilization of red algae waste as raw material to produce high-quality cellulose nanocrystals (CNC) has been investigated, and the ability of the as-isolated CNC to reinforce polymer has been studied. Red algae waste was chemically treated via alkali, bleaching and acid hydrolysis treatments, in order to obtain pure cellulose microfibers and CNC. The raw waste and the as-extracted cellulosic materials were successively characterized at different stages of treatments using serval analysis techniques. It was found that needle-like shaped CNC were successfully isolated at nanometric scale with diameters and lengths ranged from 5.2 ± 2.9 to 9.1 ± 3.1 nm, and from 285.4 ± 36.5 to 315.7 ± 30.3 nm, respectively, and the crystallinity index ranged from 81 to 87 %, depending on the hydrolysis time (30, 40 and 80 minutes). The as-extracted CNC were used as nanofillers for the production of polyvinyl alcohol (PVA)-based nanocomposite films with improved thermal and tensile properties, as well as optical transparency. It is shown that the addition of 8 wt % CNC into the PVA matrix increased the Young's modulus by 215 %, the tensile strength by 150 %, and the toughness by 45 %. Additionally, the nanocomposite films maintained the same transparency level of the neat PVA film (transmittance of ∼90% in the visible region), suggesting that the CNC were dispersed at the nanoscale.

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“…The thermal decomposition observed at 243 • C could be assigned to the decomposition of the organic compounds, including cellulose and noncellulosic matters, found in the biomaterial [36,37]. The thermal decomposition at 385 • C could be due to the depolymerization and decomposition of glycosyl units [38]. The slight decomposition observed at 544-711 • C may be associated with the degradation of inorganic compounds existing in native fruits.…”

Section: Characterization Of Nerium Oleander Fruitmentioning

confidence: 95%

A Cellulosic Fruit Derived from Nerium oleander Biomaterial: Chemical Characterization and Its Valuable Use in the Biosorption of Methylene Blue in a Batch Mode

et al. 2020

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Cellulose substrate waste has demonstrated great potential as a biosorbent of pollutants from contaminated water. In this study, Neriumoleander fruit, an agricultural waste biomaterial, was used for the biosorption of methylene blue from synthetic solution. Fourier-transform infrared (FTIR) spectroscopy indicated the presence of the main absorption peak characteristics of cellulose, hemicellulose, and lignin compositions. X-ray diffraction (XRD) pattern exhibited peaks at 2θ = 14.9° and 2θ = 22°, which are characteristics of cellulose I. Scanning electron microscopy (SEM) showed a rough and heterogeneous surface intercepted by some cavities. Thermogravimetric analysis (TGA) showed more than a thermal decomposition point, suggesting that Nerium fruit is composed of cellulose and noncellulosic matters. The pHpzc value of Nerium surface was experimentally determined to be 6.2. Nerium dosage, pH, contact time, dye concentration, and temperature significantly affected the adsorption capacity. The adsorption capacity reached 259 mg/g at 19 °C. The mean free energy ranged from 74.53 to 84.52 KJ mol−1, suggesting a chemisorption process. Thermodynamic parameters define a chemical, exothermic, and nonspontaneous mechanism. The above data suggest that Nerium fruit can be used as an excellent biomaterial for practical purification of water without the need to impart chemical functionalization on its surface.

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FTIR spectroscopy and X-ray powder diffraction characterization of microcrystalline cellulose obtained from alfa fibers

Cited by 12 publications

References 5 publications

Physicochemical Properties and Thermal Stability of Microcrystalline Cellulose Isolated from Esparto Grass Using Different Delignification Approaches

Physicochemical Properties and Thermal Stability of Microcrystalline Cellulose Isolated from Esparto Grass Using Different Delignification Approaches

Reuse of red algae waste for the production of cellulose nanocrystals and its application in polymer nanocomposites

A Cellulosic Fruit Derived from Nerium oleander Biomaterial: Chemical Characterization and Its Valuable Use in the Biosorption of Methylene Blue in a Batch Mode

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