Effect of structural changes of lignocelluloses material upon pre-treatment using green solvents

Gunny, Ahmad Anas Nagoor; Arbain, Dachyar; Jamal, Parveen

doi:10.1063/1.4981844

Cited by 8 publications

(2 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The most important peak at 897 cm -1 showed the amorphous type cellulose concentration in SE increased, and further hydrolysis of the cellulose to glucose by enzymatic hydrolysis was efficient compared to crystalline cellulose. A lower value of cellulose crystallinity index resulted in a higher sugar yield and faster hydrolysis rate (Gunny et al, 2017).…”

Section: Spectra Of Mxg Fibre After Delignificationmentioning

confidence: 99%

Purity and structural composition of lignin isolated from Miscanthus x giganteus by sub-critical water extraction with associated modifiers

2020

JAFE

View full text Add to dashboard Cite

Lignin is an industrial by-product produced from the pulping and paper industry, where the process generates lignin in the form of lignosulphonates. While there are many applications for lignin, there are all low value and attempts to add value to lignin are hindered by its complex physicochemical nature and the presence of sulphur. Adopting the biorefining concept, the study evaluates the impact of direct (DE) and sequential extraction (SE) of Miscanthus x giganteus using sub-critical water with associated modifiers; ethanol and carbon dioxide on the physical and chemical properties of the extracted lignin. Isolated lignins were characterised by a Fourier Transform Infrared Spectroscopy (FTIR). Although higher delignification was achieved by DE and SE about 81.5% and 58.0%, respectively, the lignin recovered from the SE process showed remarkably higher purity with 91.5%. Lignin recovery did not differ considerably for either processing method. FTIR revealed a qualitative reduction in the intensity of bonds corresponding to hydroxyl groups for the lignin derived from DE rather than SE processing routes. These indicated that the lignin derived from SE had potential for subsequent preparation in lignin value-added bio-based materials.

show abstract

Section: Spectra Of Mxg Fibre After Delignificationmentioning

confidence: 99%

Purity and structural composition of lignin isolated from Miscanthus x giganteus by sub-critical water extraction with associated modifiers

2020

JAFE

View full text Add to dashboard Cite

show abstract

“…The degree of crystallinity could be made an indicator to predict the rate of cellulose hydrolysis by cellulase in bioethanol production [1] or the strength of biocomposite material [2]. Furthermore, crystallinity is often utilized to monitor the effect of various treatments on lignocellulosic biomass [3][4][5][6]. Due to its importance, various methodologies have been proposed to yield a measure of crystallinity in lignocellulosic biomass [7], including X-ray diffraction, Fourier-transform infrared spectroscopy, Raman spectroscopy and solid state 13 C nuclear magnetic resonance.…”

Section: Introductionmentioning

confidence: 99%

Comparison of crystallinity index computational methods based on lignocellulose X-ray diffractogram

2023

Sustainable Processes and Clean Energy Transition

View full text Add to dashboard Cite

Abstract. Crystallinity index (CrI) obtained from X-ray diffraction (XRD) technique is often utilized as a characterization parameter of lignocellulosic biomass. There exist a few methodologies to calculate CrI but the respective merit as lignocellulose characterization parameter is not very clear. Here four commonly employed CrI computational methods were applied to raw and torrefied biomasses (palm kernel shell and sugarcane bagasse), cellulose- and lignin-added raw biomasses and artificial mixtures of cellulose, hemicellulose and lignin in order to compare the effect of the composition of lignocellulosic biomass toward CrI calculated from X-ray diffractogram. Calculated CrI systematically showed larger value than the weight percentage of cellulose contained in the samples. Among the four computational methods compared, Segal (single peak height ratio) method and Ruland-Vonk (two-peak area ratio) method appeared to give reasonable CrI numbers although they are still overestimating the cellulose weight ratio. The Ruland-Vonk method consistently gave the lowest CrI values among the methods examined.

show abstract

Preparation of cellulose-rich membranes from wood: effect of wood pretreatment process on membrane performance

et al. 2020

View full text Add to dashboard Cite

In this study cellulose-rich membranes were fabricated from untreated and treated hardwood biomass solutions in 1-ethyl-3-methylimidazolium acetate ([Emim][OAc])—dimetylsulfoxide (DMSO) system via wet phase separation. Wood treatment methods aimed to get purified cellulose fraction of wood. Treatment sequence was as followed: deep eutectic solvent pretreatment, sodium chlorite bleaching, and alkaline treatment. Resulted biomass after each treatment step was characterized by chemical composition and crystalline fraction content. Flat-sheet membranes were produced from biomass samples after each treatment step. Characterization of membranes included measurements of pure water permeability and (poly)ethyleneglycol 35 kDa retention, Fourier-transform infrared and Raman spectroscopy, X-ray diffraction measurements and thermogravimetric analysis. The study revealed that it was possible to fabricate membrane from untreated wood as well as from wood biomass after each of treatment steps. The resulted membranes differed in chemical composition and filtration performance. Membrane prepared directly from untreated wood had the highest permeability, the lowest retention; and the most complex chemical composition among others. As treatment steps removed lignin and hemicelluloses from the wood biomass, the corresponding membranes became chemically more homogeneous and showed increased retention and decreased permeability values.

show abstract

Effect of structural changes of lignocelluloses material upon pre-treatment using green solvents

Cited by 8 publications

References 13 publications

Purity and structural composition of lignin isolated from Miscanthus x giganteus by sub-critical water extraction with associated modifiers

Purity and structural composition of lignin isolated from Miscanthus x giganteus by sub-critical water extraction with associated modifiers

Comparison of crystallinity index computational methods based on lignocellulose X-ray diffractogram

Preparation of cellulose-rich membranes from wood: effect of wood pretreatment process on membrane performance

Contact Info

Product

Resources

About