Ultrafast process of microwave-assisted deep eutectic solvent to improve properties of bamboo dissolving pulp

Duan, Chao; Tian, Chaochao; Feng, Xiuli; Tian, Guodong; Liu, Xiaoshuang; Ni, Yonghao

doi:10.1016/j.biortech.2022.128543

Cited by 30 publications

(7 citation statements)

References 41 publications

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“…After that, the system was cooled from 90 ℃ to 60 ℃ to obtain enzymatically hydrolyzed starch. The obtained product was oven-dried in a tin box at 105 ℃ for 8 h to obtain starch powder sample, which was further ground into fine starch powder with tiny particle size by using a mortar and stored in a plastic bag for further use [27][28][29] .…”

Section: α-Amylase Hydrolysis Treatment Of Starchmentioning

confidence: 99%

Biodegradation Behavior of Starch in Simulated White Water System of Old Corrugated Cardboard Pulping Process

Guo¹,

Liu²,

Zhang³

et al. 2023

Paper and Biomaterials

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Considering the serious barriers/issues induced by the accumulated starch generated in white water system of old corrugated cardboard (OCC) pulping process, large amounts of accumulated starch in white water would be decomposed by microorganisms and could not be utilized, thereby resulting in severe resource wastage and environmental pollution. This study mainly explored the effects of biodegradation/hydrolysis conditions of the two types of starch substrates (native starch and enzymatically (α-amylase) hydrolyzed starch), which were treated via microorganism degradation within the simulated white water from OCC pulping system and their biodegradation products on the key properties were characterized via X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), and gel permeation chromatography (GPC) technologies. The effects of system temperature, pH value, starch concentration, and biodegradation time on starch biodegradation ratio and the characteristics of obtained biodegradated products from the two

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Section: α-Amylase Hydrolysis Treatment Of Starchmentioning

confidence: 99%

Biodegradation Behavior of Starch in Simulated White Water System of Old Corrugated Cardboard Pulping Process

Guo¹,

Liu²,

Zhang³

et al. 2023

Paper and Biomaterials

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“…Similar to ILs, DESs also dissolve cellulose through hydrogen bonding competition, especially in dissolving pulp, which can significantly reduce viscosity and greatly improve reactivity. [31,32] The study of DESs mainly focuses on the pretreatment process for lignocellulose, and the dissolution effect is poor, so the subsequent dissolution requires the cooperation of other reagents. Yang et al pretreated corn cobs with DESs, which effectively removed lignin and hemicellulose and extensively retained cellulose, followed by adding ZnCl 2 /CaCl 2 for forming hydrogels.…”

Section: Deep Eutectic Solventsmentioning

confidence: 99%

“…Moreover, the high viscosity and reclamation were still the defect. Similar to ILs, DESs also dissolve cellulose through hydrogen bonding competition, especially in dissolving pulp, which can significantly reduce viscosity and greatly improve reactivity [31,32] …”

Section: Dissolution Of Cellulosementioning

confidence: 99%

Cellulose Dissolution, Modification, and the Derived Hydrogel: A Review

Wu,

Li,

Zhang

et al. 2023

ChemSusChem

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The development of cellulose‐based hydrogel has occupied a pivotal position in almost all walks of life. However, the native cellulose can not be directly used for preparing hydrogel due to the complex non‐covalent interactions. Some literature has discussed the dissolution and modification of cellulose but has yet to address the influence of the pretreatment on the as‐prepared hydrogels. Firstly, the "touching" of cellulose by derivative and non‐derivative solvents was introduced, viz., the dissolution of cellulose. Secondly, the "conversion" of functional groups on the cellulose surface by special routes, viz., the modification of cellulose. The above‐mentioned two parts were intended to explain the changes in physicochemical properties of cellulose by these routes and their influences on the subsequent hydrogel preparation. Finally, we summarized the “reinforcement” of cellulose‐based hydrogels by physical and chemical techniques, viz., improving the mechanical properties of cellulose‐based hydrogels and the changes in the multi‐level structure of the interior of cellulose‐based hydrogels.

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“…Prior to cellulose depolymerization, the destruction of the recalcitrant crystalline structure of cellulose to an amorphous structure by destroying the original inter-/intramolecular hydrogen bonds within cellulose with a physical (e.g., ball-milling − ) or chemical pretreatment (e.g., ionic liquid (ILs), − deep eutectic solvent (EDSs), , or molten salt hydrates (MSHs)) , was proven to be an effective strategy for the subsequent rapid depolymerization of cellulose at a low temperature of <413 K and thus disfavored the repolymerization of oligo-/monosaccharides into humins (Scheme b). , However, Tyufekchiev et al found that the ball-milled cellulose would undergo recrystallization during depolymerization in water, which decreased the kinetics of cellulose hydrolysis. Besides, the destroying of the whole hydrogen-bond network within cellulose by chemical pretreatment with ILs, EDSs, or MSHs was thought to efficiently lower the degree of crystallinity − but sharply enhance the local concentration of oligosaccharides on a cellulosic surface and disfavor the following mass transfer and conversion, especially at high substrate loading …”

Section: Introductionmentioning

confidence: 99%

Underlying Mechanisms on the Controlled Depolymerization of High-Loading Cellulose in Water Promoted by Cetyltrimethylammonium Bromide

Hu,

Li,

Xue

et al. 2023

ACS Sustainable Chem. Eng.

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Valorization of cellulose through tandem chemical conversions depends significantly on the controllable depolymerization of cellulose to poly-/oligo-/monosaccharides with the desired rate and degree. Herein, we report the controlled depolymerization of high-loading cellulose (15.0 wt %) into polysaccharides with a uniform polymerization degree of 38−48 by cetyltrimethylammonium bromide (CTAB) in water and its underlying mechanisms. We found that CTAB was adsorbed on the cellulosic surface via hydrophobic interaction, thereby acting as an "adhesive" for reducing the interfacial tension between H 2 O/ H 3 O + and the cellulosic surface, helping in swelling of the crystalline region, promoting depolymerization of the amorphous region, and inhibiting repolymerization of polysaccharides. Further kinetic study demonstrated an increment of ∼400 times in the preexponential factor (10 19.3 vs 10 16.7 min −1 ), 19.6 kJ•mol −1 in activation energy (181.5 vs 161.9 kJ•mol −1 ), and 3.5 times in rate constant for the CTAB-promoted depolymerization, which highlighted the offsetting of the elevated reaction energy barrier by boosting the collision frequency between H 2 O/H 3 O + and cellulose. Furthermore, we illustrated the synergistic role of 1,4-dioxane on this controllable depolymerization by lowering the activation energy to 143.7 kJ•mol −1 for reducing polysaccharide accumulation at the cellulosic interface. This in-depth understanding is of great significance for the sustainable transformation and utilization of cellulose in future biorefineries.

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Ultrafast process of microwave-assisted deep eutectic solvent to improve properties of bamboo dissolving pulp

Cited by 30 publications

References 41 publications

Biodegradation Behavior of Starch in Simulated White Water System of Old Corrugated Cardboard Pulping Process

Biodegradation Behavior of Starch in Simulated White Water System of Old Corrugated Cardboard Pulping Process

Cellulose Dissolution, Modification, and the Derived Hydrogel: A Review

Underlying Mechanisms on the Controlled Depolymerization of High-Loading Cellulose in Water Promoted by Cetyltrimethylammonium Bromide

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