Treating lignocellulosic biomass with dilute solutions at ambient temperature: effects on cellulose crystallinity

Haykırı-Açma, H.; Yaman, Serdar

doi:10.1007/s13399-022-03085-w

Cited by 5 publications

(2 citation statements)

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“…According to the work of Haykiri-Acma and Yaman [90], the effect of pretreatments on the fiber structure is directly related to its severity; thus, in milder experimental conditions, there is only the partial removal of lignin and hemicellulose, leading to a theoretical increase in the degree of crystallinity. However, when observing the reduction in TCI and the most significant increase in HBI for samples treated with organosolv, the results suggest that this technique not only caused the removal of lignin and hemicellulose but may also have led to the rupture of some hydrogen bonds, altering the cellulose structure, and making it more susceptible to hydrolysis.…”

Section: Ft-ir Analysismentioning

confidence: 99%

Comparative Study of Pretreatments on Coconut Fiber for Efficient Isolation of Lignocellulosic Fractions

Vieira,

Santana,

Jesus

et al. 2024

Sustainability

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Pretreatment is an essential step for breaking the recalcitrant structure of lignocellulosic biomass and allowing conversion to high-value-added chemicals. In this study, coconut fiber was subjected to three pretreatment methods to compare their impacts on the biomass’s structural characteristics and their efficiency in fractionating the biomass. This comparative approach was conducted to identify mild biomass pretreatment conditions that efficiently extract lignin and recover cellulose-rich pulp for the production of bioproducts. To this end, autohydrolysis, alkaline, and organosolv pretreatments were performed under different experimental conditions, and the physicochemical properties of the samples were evaluated using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and chemical characterization of the cellulose, hemicellulose, and lignin fractions. Therefore, efficient experimental conditions were identified to pretreat coconut fibers with an extended understanding of the methods to process lignocellulose. Great delignification efficiency and pulp yield were obtained with organosolv > alkaline extraction > autohydrolysis under the selected conditions of 2 h at 185 °C in the presence of a catalyst, namely, 0.5 M NaOH, for 2 h at 55 °C and 20 min at 195 °C, respectively. FT-IR revealed a predominance of hydroxyl groups in fibers obtained from alkaline and organosolv pretreatment, showing higher lignin degradation and cellulose concentration in these samples. TGA revealed mass loss curves with similar behaviors but different patterns and intensities, and MVE analysis showed differences on the surfaces of each sample. The comparison of experimental parameters allowed the identification of suitable conditions for each extraction method, and structural analyses identified the specific characteristics of the fibers that could be obtained according to the method used. Therefore, the results are of great importance for developing sustainable and effective industrial processes.

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Section: Ft-ir Analysismentioning

confidence: 99%

Comparative Study of Pretreatments on Coconut Fiber for Efficient Isolation of Lignocellulosic Fractions

Vieira,

Santana,

Jesus

et al. 2024

Sustainability

View full text Add to dashboard Cite

show abstract

“…Acid–based catalysts such as HCl, H 2 SO 4 , HNO 3 , and CH 3 COOH are frequently used since they are inexpensive and may change the crystal structure of cellulose and degrade the hydrogen bonds among cellulose and units of glucose, producing lignocellulosic biomass less resistant. − In enzymatic saccharification, it has been shown that good sugar yields can be obtained with the use of acid pretreatment . The lignin and hemicellulose sections of the biomass are the only parts of the biomass that are selectively subjected to acid pretreatment.…”

Section: Modification Of Ligninmentioning

confidence: 99%