In-depth study of agave fiber structure using Fourier transform infrared spectroscopy

Oudiani, Asma El; Msahli, Slah; Sakli, Faouzi

doi:10.1016/j.carbpol.2017.01.091

Cited by 73 publications

(33 citation statements)

References 33 publications

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“…The Total Crystallinity Index (TCI) is obtained by dividing the absorbance at 1375 cm −1 by that at 2900 cm −1 , and the value obtained is proportional to the degree of crystallinity of the cellulose in the fibres. Results seems to indicate that treated samples have higher levels of crystallinity, as TCI is higher; results are close to those obtained by Bezazi and collaborators, appearing that fibres extracted by mechanical means have higher crystallinity, although are quite far from results reported by El Oudiani and co-authors for agave fibres [39]. In this same paper, values reported for other fibres, such as sisal, are higher, reaching up to 1.300.…”

Section: Fibre Characterizationsupporting

confidence: 88%

“…From FTIR spectra, some data related to crystallinity of cellulose in the fibres can be obtained (Table 2), as explained by El Oudiani et al [39]. The Total Crystallinity Index (TCI) is obtained by dividing the absorbance at 1375 cm −1 by that at 2900 cm −1 , and the value obtained is proportional to the degree of crystallinity of the cellulose in the fibres.…”

Section: Fibre Characterizationmentioning

confidence: 99%

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Characterization of Agave americana L. plant as potential source of fibres for composites obtaining

et al. 2019

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This paper summarises the results obtained from the characterization assays from century plant (Agave americana L.), determining the chemical composition of different parts of the plant. Fibres were obtained by means of a mechanical device, specifically designed and built for Agave americana leaves processing. Obtained fibres were subjected to thermogravimetric analysis and infrared spectra, and their chemical composition was also determined by quantitative acid hydrolysis. Once obtained, fibres were blended up to 40% (in weight) to obtain composites by compression moulding, using polyethylene as matrix; mechanical testing show improvements in elastic modulus for both tensile and flexural tests; increase in flexural maximum strength were also found for the composites, while tensile strength is slightly reduced with the introduction of agave fibres. The research is part of a project developed in the Macaronesian region, which aim is to demonstrate the feasibility of using biomass from invasive plant species in the composites sector as a way of financing control campaigns and habitats conservation labours, which is the main novelty of this research.

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Section: Fibre Characterizationsupporting

confidence: 88%

Section: Fibre Characterizationmentioning

confidence: 99%

Characterization of Agave americana L. plant as potential source of fibres for composites obtaining

et al. 2019

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“…This means that, although these components can be already detected, weaker, in the spectrum of pure PLA, the addition of sisal changes relative intensities. For instance, similar features were assigned to symmetric and asymmetric methyl and methylene groups of side chains likely in the lignin structure of sisal [ 37 , 38 ] which, in our case, will overlap with features typical of PLA chains leading to an increased relative absorption in this region. Correspondingly, the relative intensity of the band at 2997 cm −1 (v as CH 3 ) slightly decreases (although not proportionally) in samples PLA20 and PLA30, if compared to other bands in this region (i.e., bands at 2922 and 2850 cm −1 ).…”

Section: Resultssupporting

confidence: 57%

Influence of the Degradation Medium on Water Uptake, Morphology, and Chemical Structure of Poly(Lactic Acid)-Sisal Bio-Composites

et al. 2020

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A series of poly(lactic acid) (PLA) and poly(lactic acid)-based bio-composites (sisal PLA) were prepared and studied by spectroscopic and microscopic techniques as such and after immersion at room temperature in different degradation mediums (i.e., distilled and natural sea water and solutions at pH = 2, 6, and 8). In these conditions, some of their macroscopic and microscopic properties were monitored during a period of 30 days. Water absorption increased with the increasing fiber content regardless of the immersion medium. The maximum water absorption was achieved at pH = 8 (~16%), indicating a more severe action of the alkaline mediums on the samples. The diffusivity, D, of PLA decreased with the addition of fibers and acidic mediums showed higher D, indicating higher diffusivity of water through the specimens with respect to those submerged in moderate or alkaline mediums. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) analysis evidenced a weak interaction between the PLA matrix and the sisal fibers. Very limited degradation phenomena occur in our conditions: Despite some changes in the microstructure, the PLA backbone seems to be largely resistant to hydrolysis, almost regardless of the pH value and even at the highest sisal content.

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“… 57 − 59 Peaks located above 3000 cm –1 are unsaturated and are willing to take part in hydrogen bonding. 60 , 61 S. molle and S. paniculatum (and to a minor extent P. undulatum ) possessed well-defined peaks in this region, and this may be responsible for the particles’ tendency to agglomerate.…”

Section: Results and Discussionmentioning

confidence: 94%

Phytofabrication of Iron Nanoparticles for Hexavalent Chromium Remediation

2018

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Hexavalent chromium is a genotoxic and carcinogenic byproduct of a number of industrial processes, which is discharged into the environment in excessive and toxic concentrations worldwide. In this paper, the synthesis of green iron oxide nanoparticles using extracts of four novel plant species [Pittosporum undulatum, Melia azedarach, Schinus molle, and Syzygium paniculatum (var. australe)] using a “bottom-up approach” has been implemented for hexavalent chromium remediation. Nanoparticle characterizations show that different plant extracts lead to the formation of nanoparticles with different sizes, agglomeration tendencies, and shapes but similar amorphous nature and elemental makeup. Hexavalent chromium removal is linked with the particle size and monodispersity. Nanoparticles with sizes between 5 and 15 nm from M. azedarach and P. undulatum showed enhanced chromium removal capacities (84.1–96.2%, respectively) when compared to the agglomerated particles of S. molle and S. paniculatum with sizes between 30 and 100 nm (43.7–58.7%, respectively) in over 9 h. This study has shown that the reduction of iron salts with plant extracts is unlikely to generate vast quantities of stable zero valent iron nanoparticles but rather favor the formation of iron oxide nanoparticles. In addition, plant extracts with higher antioxidant concentrations may not produce nanoparticles with morphologies optimal for pollutant remediation.

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In-depth study of agave fiber structure using Fourier transform infrared spectroscopy

Cited by 73 publications

References 33 publications

Characterization of Agave americana L. plant as potential source of fibres for composites obtaining

Characterization of Agave americana L. plant as potential source of fibres for composites obtaining

Influence of the Degradation Medium on Water Uptake, Morphology, and Chemical Structure of Poly(Lactic Acid)-Sisal Bio-Composites

Phytofabrication of Iron Nanoparticles for Hexavalent Chromium Remediation

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