Boosting Oxygen Delignification of Poplar Kraft Pulp by Xylanase Pretreatment

Ji, Xingxiang; Chen, Jiachuan; Wang, Qiang; Tian, Zhongjian; Yang, Guihua; Liu, Shanshan

doi:10.15376/biores.10.2.2518-2525

Cited by 7 publications

(4 citation statements)

References 15 publications

(18 reference statements)

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“…This is while the Lc(n) and width of the control sample were only 0.647 mm and 13.46 µm, respectively. Meanwhile, the curl index increased from 9.12% to 14.48% for the control pulp, and it further improved to 14 The pulp characterization results supported those of the previous finding, where IL pretreatments not only enhanced the lignin degradation and removal but also protected the pulp fiber from degradation during the oxygen delignification process. Taking [TEA][HSO 4 ] pretreated bleached pulp, for example, its viscosity, DP, and fiber length, were all similar to those in the original KP; in comparison, all the mentioned parameters significantly decreased in the control sample.…”

Section: Effect Of Ils Pretreatment On Pulp Propertiessupporting

confidence: 85%

“…While the addition of sodium perborate could be employed to avoid the bleaching damage of pulp fibers, it has a minor elevation in bleachability [ 13 ]. Xylanase pretreatment that has been reported to slightly elevate the pulp viscosity, showing minor improvement in delignification efficiency [ 14 ]. Thereby, it seems difficult for a single pretreatment to simultaneously enhance the delignification and elevate the physical strength of pulp.…”

Section: Introductionmentioning

confidence: 99%

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The Dual Effect of Ionic Liquid Pretreatment on the Eucalyptus Kraft Pulp during Oxygen Delignification Process

Liu

Peng

et al. 2021

Polymers

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Oxygen delignification presents high efficiency but causes damage to cellulose, therefore leading to an undesired loss in pulp strength. The effect of ionic liquid pretreatment of [BMIM][HSO4] and [TEA][HSO4] on oxygen delignification of the eucalyptus kraft pulp was investigated at 10% IL loading and 10% pulp consistency, after which composition analysis, pulp and fiber characterizations, and the mechanism of lignin degradation were carried out. A possible dual effect of enhancing delignification and protecting fibers from oxidation damage occurred simultaneously. The proposed [TEA][HSO4] pretreatment facilitated lignin removal in oxygen delignification and provided fibers with improved DP, fiber length and width, and curl index, resulting in the enhanced physical strength of pulp. Particularly, its folding endurance improved by 110%. An unusual brightness reduction was identified, followed by detailed characterization on the pulps and extracted lignin with FTIR, UV, XPS, and HSQC. It was proposed that [TEA][HSO4] catalyzed the cleavage of β-O-4 bonds in lignin during the oxygen delignification, with the formation of Hibbert’s ketones and quinonoid compounds. The decomposed lignin dissolved and migrated to the fiber surface, where they facilitated the access of the oxidation agent and protected the fiber framework from oxidation damage. Therefore, it was concluded that ionic liquid pretreatment has a dual effect on oxygen delignification.

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Section: Effect Of Ils Pretreatment On Pulp Propertiessupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

The Dual Effect of Ionic Liquid Pretreatment on the Eucalyptus Kraft Pulp during Oxygen Delignification Process

Liu

Peng

et al. 2021

Polymers

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“…Peroxide bleaching removes residual lignin by oxidation (Ji et al 2015). The dissociation of hydrogen peroxide in alkaline media generates the peroxide anion (HHO -), which is mainly responsible for the reduction in the concentration of chromophores (Liu et al 2014), leading to brighter bleached fibers.…”

Section: Resultsmentioning

confidence: 99%

How the chemical nature of Brazilian hardwoods affects nanofibrillation of cellulose fibers and film optical quality

et al. 2015

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A wide range of alternative cellulose fibers for the development of new green nanomaterials can be obtained from Brazil's natural resources. The objective of the work is to evaluate the influence of the chemical composition of hardwoods on the nanofibrillation process and optical quality of nanofiber films. Wood wastes were selected from three native Amazonian species and from exotic planted Eucalyptus grandis species. Wood sawdust was submitted to chemical alkali and bleaching pretreatments. Nanofibers were produced from the bleached fibers after 10, 20, 30 and 40 passes through a Super Mass Colloider grinder, and films were produced by the casting method. Raw sawdust, alkali-treated fibers and bleached fibers were evaluated by the major chemical components, syringyl/guaiacyl ratio, Fourier transformed infrared spectroscopy, oxygen/carbon ratio and scanning electron microscopy. Morphological characteristics of nanofibers and films were analyzed by transmission and scanning electron microscopies. Optical parameters studied for the films were the opacity, total color difference and b value. The main challenge to delignification was attributed to the low syringyl/guaiacyl ratio. The different chemical natures of Amazonian and eucalyptus hardwoods greatly affected pretreatments and, consequently, the nanofibrillation and optical quality of the films. Consequences observed for highly purified cellulose starting fibers are: (1) lower diameters for individual nanofiber elements; (2) fewer opaque and colored films produced from nanofibers; (3) a tendency to stabilization of the nanofibrillation process after 20 passes through the grinder. For species whose chemical nature hindered cellulose purification, the increased number L. Bufalino (of passes through the grinder continuously decreased the opacity.

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“…Com o tratamento de NaOH parte da lignina solubilizada foi removida, resultando na formação de monômeros (Beukes & Pletschke, 2011). O tratamento de branqueamento com peróxido de hidrogênio (H2O2) visa maximizar a deslignificação após o processo alcalino (López, et al, 2003), já que remove a lignina residual por oxidação (Ji, et al, 2015).…”

Section: Caracterização Da Cristalinidade Das Fibras De Coco In Natur...unclassified

Tratamentos físicos e químicos de fibras residuais de Cocos nucifera L. visando aplicação em compósitos cimentícios

Cardoso

Oliveira

Bufalino

et al. 2022

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O trabalho teve como foco avaliar as fibras do mesocarpo do coco (Cocos nucifera L.) na condição in natura e submetidas a tratamentos físicos e químicos para aplicação em compósitos de cimento Portland. As fibras in natura foram submetidas a quatro tratamentos distintos: imersão em água fria a 21ºC; imersão em água quente a 90ºC; imersão em solução aquosa de NaOH a 5%; e imersão em solução aquosa de H2O2 a 24% e de NaOH a 4%. As fibras in natura e tratadas foram avaliadas por difração de raios-x, microscopia eletrônica de varredura e espectroscopia no infravermelho com transformada de Fourier. Testes de calorimetria foram utilizados para avaliar a influência das fibras obtidas de diferentes tratamentos no comportamento exotérmico da hidratação do cimento. Os resultados indicaram que todos os tratamentos aumentaram o índice de cristalinidade, com destaque para o tratamento alcalino seguido de branqueamento (41,2 %). O ensaio de calorimetria indicou que a fibra in natura e a tratada com água quente inibiu significativamente a hidratação do cimento. Por outro lado, os tratamentos com água fria, alcalino e alcalino seguido branqueamento resultaram em fibras com maior potencial para aplicação em compósitos cimentícios.

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Boosting Oxygen Delignification of Poplar Kraft Pulp by Xylanase Pretreatment

Cited by 7 publications

References 15 publications

The Dual Effect of Ionic Liquid Pretreatment on the Eucalyptus Kraft Pulp during Oxygen Delignification Process

The Dual Effect of Ionic Liquid Pretreatment on the Eucalyptus Kraft Pulp during Oxygen Delignification Process

How the chemical nature of Brazilian hardwoods affects nanofibrillation of cellulose fibers and film optical quality

Tratamentos físicos e químicos de fibras residuais de Cocos nucifera L. visando aplicação em compósitos cimentícios

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