Effect of chemical treatments on properties of green coconut fiber

Brígida, Ana Iraidy S.; Calado, Verônica; Gonçalves, Leandra Regina; Coelho, Maria Alice Zarur

doi:10.1016/j.carbpol.2009.10.005

Cited by 294 publications

(189 citation statements)

References 22 publications

Supporting

Mentioning

147

Contrasting

Unclassified

Order By: Relevance

“…Similar work was reported by Arrakhiz et al [22]. Brigida et al [23] that FTIR analyses also reveal a reduction in hemicellulose content in the treated fibers. The absorbance peak characteristics at 2849 cm -1 shows the C-H stretching vibration of methyl and methylene groups in the cellulose and hemicellulose molecules.…”

Section: Fourier Transform Infrared Spectroscopy (Ftir)supporting

confidence: 86%

“…The asymmetric C-H3 and C-H symmetric represented the absorbance band at 1471 cm -1 and 1318 cm -1 which revealed the deformation of the lignin molecules due to alkaline treatment. The large peak observed for the untreated fiber can be associated to the prescence of lignin and confirmed by the peaks [23,24]. The treated alkaline fiber shows the peaks at 1400 cm -1 and 1300 cm -1 revealed C-O stretching vibrations for the untreated fiber disappears after treatment.…”

Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 57%

“…However, it is also evident that C-O stretching vibrations at the peak of 1036 cm -1 revealed that acetyl groups is reduced with the removal of the hemicellulose and waxes by the alkaline treatment which disappears with the alkaline treatment. Broadband is related to the vibration C-O of esters, ethers and phenol groups attributed mainly to a presence of waxes in the epidermal tissue [23], and the disappearance of this band in the treated fibers results from the removal of waxes.…”

Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

See 2 more Smart Citations

Development of Entada Mannii Fiber Polypropylene Matrix Composites for Light Weight Applications

Balogun¹,

Omotoyinbo²,

Alaneme³

et al. 2017

Tribol. Ind.

View full text Add to dashboard Cite

show abstract

Section: Fourier Transform Infrared Spectroscopy (Ftir)supporting

confidence: 86%

Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 57%

Section: Fourier Transform Infrared Spectroscopy (Ftir)mentioning

confidence: 99%

See 1 more Smart Citation

Development of Entada Mannii Fiber Polypropylene Matrix Composites for Light Weight Applications

Balogun¹,

Omotoyinbo²,

Alaneme³

et al. 2017

Tribol. Ind.

View full text Add to dashboard Cite

show abstract

“…Riyajan and Intharit (2011) studied the morphology of sugarcane bagasse subjected to a combined sodium hydroxide and silane pretreatment, showing that the surface of raw bagasse exhibited lower roughness when compared with the pretreated bagasse, which was caused by the removal of fatty acids from the surface of the bagasse. Morphological studies with green coconut, soybean straw, wheat bran, rice hulls, sugarcane bagasse and cashew apple have also been carried out after different pretreatments (Brigida et al, 2010;Xu et al, 2007;Zhao et al, 2010;Camargo et al, 2012 andRocha, 2010).…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Composition, Characterization and Enzymatic Hydrolysis of Pretreated Sugar Cane Bagasse

Guilherme

Dantas

Santos

et al. 2015

Braz. J. Chem. Eng.

147

View full text Add to dashboard Cite

-Glucose production from sugarcane bagasse was investigated. Sugarcane bagasse was pretreated by four different methods: combined acid and alkaline, combined hydrothermal and alkaline, alkaline, and peroxide pretreatment. The raw material and the solid fraction of the pretreated bagasse were characterized according to the composition, SEM, X-ray and FTIR analysis. Glucose production after enzymatic hydrolysis of the pretreated bagasse was also evaluated. All these results were used to develop relationships between these parameters to understand better and improve this process. The results showed that the alkaline pretreatment, using sodium hydroxide, was able to reduce the amount of lignin in the sugarcane bagasse, leading to a better performance in glucose production after the pretreatment process and enzymatic hydrolysis. A good xylose production was also observed.

show abstract

“…Isso pode ser explicado pela remoção parcial e desigual de constituintes da fibra após o tratamento químico por NaOH, conforme apresentado em micrografia anterior. Brígida et al [14] utilizaram um tratamento químico por imersão de 5g de fibras em solução de 4 a 6% de 100 mL de NaOCl durante 2 horas a 30°C e, em seguida, as fibras foram lavadas com água e embebidas em solução de 10% de 100 mL de NaOH durante 1 hora a 30 ºC. O tratamento utilizado por Brígida et al [14] causou uma redução significativa em aproximadamente um terço do diâmetro médio de fibra de coco, se comparado ao da fibra natural.…”

Section: Comportamento Morfológicounclassified

Comportamento Morfológico E Mecânico De Fibras De Coco Tratadas Superficialmente E De Mantas De Fibra De Coco

Rios¹,

Júnior²,

Lima³

et al. 2018

ABM Proceedings

View full text Add to dashboard Cite

ResumoNeste estudo, caracterizações morfológicas e mecânicas foram utilizadas em fibras de coco brasileiras na condição como recebida e tratadas superficialmente (por NaOH, aquecidas e por NaOH seguido de aquecimento) e em mantas de fibras de coco fabricadas por compressão. Para a análise morfológica foi utilizada a Microscopia Eletrônica de Varredura (MEV) e para a análise mecânica foi utilizado o ensaio de tração uniaxial. As análises por MEV apresentaram que as fibras tratadas por NaOH possuem paredes celulares externas mais nítidas e partículas circulares com diâmetros de aproximadamente 10 μm. O tratamento químico alterou a parede externa das fibras de coco; em uma das amostras foram vistas microtrincas da ordem de 7 a 60 µm em virtude do tratamento seguido de aquecimento. O módulo inicial (módulo de elasticidade) e a tensão de ruptura diminuíram com o aumento de diâmetro nas quatro condições de fibras de coco estudadas. A geometria e a massa da manta de fibra de coco influenciaram no seu comportamento mecânico. Palavras-chave: Fibra de coco; Comportamento morfológico; Comportamento mecânico. MORPHOLOGICAL AND MECHANICAL BEHAVIOR OF COCONUT FIBERS TREATED SUPERFICIALLY AND COCONUT FIBERS MATS AbstractNatural fibers has recently gained attention due to low environmental impact, low cost and easy availability. Morphological and mechanical investigations on Brazilian coconut fibers in four different surface conditions (as received; dried; chemically treated by NaOH; chemically treated by NaOH followed by heating) and coconut fiber mats manufactured by compression were used in this study. Scanning Electron Microscopy (SEM) were used to morphological analysis and in-situ mechanical testing uniaxial traction were used. SEM analysis showed the chemically treated coconut fibers have sharper external cell walls and circular particles with diameters of approximately 10 µm. Chemical treatment altered the external wall of coconut fibers; on one of the samples were seen microcracks order 7 to 60 µm due to the treatment followed by heating. The initial modulus (modulus of elasticity) and tensile strength decreased with increasing diameter for the four conditions of coconut fibers. The geometry and the weight of the coconut fiber mats influenced their mechanical behavior.

show abstract

Effect of chemical treatments on properties of green coconut fiber

Cited by 294 publications

References 22 publications

Development of Entada Mannii Fiber Polypropylene Matrix Composites for Light Weight Applications

Development of Entada Mannii Fiber Polypropylene Matrix Composites for Light Weight Applications

Evaluation of Composition, Characterization and Enzymatic Hydrolysis of Pretreated Sugar Cane Bagasse

Comportamento Morfológico E Mecânico De Fibras De Coco Tratadas Superficialmente E De Mantas De Fibra De Coco

Contact Info

Product

Resources

About