Rapid, high-yield production of lignin-containing cellulose nanocrystals using recyclable oxalic acid dihydrate

Jiang, Jungang; Zhu, Yeling; Zargar, Shiva; Wu, Jie; Oğuzlu, Hale; Baldelli, Alberto; Yu, Zhengyang; Saddler, Jack N.; Sun, Run‐Cang; Tu, Qingshi

doi:10.1016/j.indcrop.2021.114148

Cited by 37 publications

(7 citation statements)

References 49 publications

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“…[ 33 ] This can be further confirmed by the FTIR (Figure S2, Supporting Information). The peak at 1735 cm −1 , which is commonly related to the stretching vibration of carbonyl groups in hemicellulose, [ 34,35 ] is still prominent after NaClO 2 treatment. Such strong electrostatic repulsion of the negatively charged functional groups of hemp microfibers contributed to the colloidal stability of the suspension, as indicated by no gravity sedimentation of the suspension after one month (Figure 2f).…”

Section: Resultsmentioning

confidence: 99%

Superelastic and Ultralight Aerogel Assembled from Hemp Microfibers

Zhu

et al. 2023

Adv Funct Materials

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Aerogels with both high elastic strain and fast shape recovery after compression have broad application potentials as thermal regulation, absorbents, and electrical devices. However, creating such aerogels from cellulosic materials requires complicated preparation processes. Herein, a simple strategy for scalable production of hemp microfibers using a top-down method is reported, which can further be assembled into aerogels with interconnected porous structures via ice-templating technique. With density as low as 2.1 mg cm −3 , these aerogels demonstrate isotropic superelasticity, as exhibited by their fast shape restoration from over 80% compressive strain. Due to the high porosity (99.87%) and structural tortuosity, these aerogels show a low thermal conductivity of 0.0215 ± 0.0002 W m −1 K −1 , suggesting their potential in thermal insulation application. Certain hydrophobic modification using silane derivative further endows these aerogels with reduced water affinity. Overall, the proposed strategy to prepare bio-based microfibers using scalable technology, as well as the assembled aerogels, provides new insights into the design and fabrication of multifunctional bio-based aerogels for value-added applications.

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Section: Resultsmentioning

confidence: 99%

Superelastic and Ultralight Aerogel Assembled from Hemp Microfibers

Zhu

et al. 2023

Adv Funct Materials

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“…Micro-fibrillation of enzyme treated unbleached kraft pulp was carried out in a kitchen blender (Vitamix E310) at 1 wt% solids loading (0.2 g in 200 mL distilled water) for 30 minutes. Nano-fibrillation of micro-fibrillated pulp was carried out in a microfluidizer (Nano DeBEE) at 0.5 wt% consistency for 10 passes, using the Z05 nozzle that has a size of 0.13 mm, following protocol reported by Jiang et al 29…”

Section: Methodsmentioning

confidence: 99%

Production of lignin containing cellulose nanofibrils (CNF) after enzymatic treatment of curl-induced, unbleached kraft pulps

Wu,

Dong,

Sun

et al. 2024

Green Chem.

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“…With the development of the DES system, a green and efficient pretreatment process for CNC preparation has been of wide concern for experts in the field. Instead of using the DES pretreatment system, some studies began to focus on the use of a recyclable organic acid system (e.g., oxalic acid, maleic acid, citric acid, p -toluenesulfonic acid, and formic acid) for cellulose pretreatment in CNC production. − These organic acids can be easily recovered via commercially proven decompression distillation or crystallization processes, which reduce production costs while suppressing acidic wastewater generation. However, the weak acidity of formic acid (p K a = 3.75), maleic acid (p K a = 1.9), and citric acid (p K a = 3.13) dramatically increases the energy consumption of the pretreatment process .…”

Section: Introductionmentioning

confidence: 99%

Cellulose Nanocrystal Preparation via Rapid Hydrolysis of Wood Cellulose Fibers Using Recyclable Molten Ferric Chloride Hexahydrate

Yang

Mei

Feng

et al. 2023

ACS Sustainable Chem. Eng.

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Cellulose nanocrystals (CNCs) are clean and sustainable materials that have drawn significant attention in academia and industry because of their unique physicochemical properties. However, realizing economical and environmentally friendly production of CNCs remains a challenge. In this study, we proposed an innovative strategy to fabricate CNCs, which involves the acid hydrolysis pretreatment of wood cellulose fibers using innocuous and recyclable ferric chloride hexahydrate (FeCl 3 • 6H 2 O). During the molten FeCl 3 •6H 2 O treatment, the degree of polymerization (DP) of the cellulose fibers sharply decreased, along with the transformation of cellulose I to cellulose II crystallites. Molten FeCl 3 •6H 2 O quickly hydrolyzed cellulose fibers within 5 min at 80 °C, inducing a rapid decrease in the DP from 922 to 196, and the water-insoluble solid (WIS) retention reached 80.1%. CNCs were successfully produced from the mechanical disintegration of the WIS with a low energy input. Hence, the yield of CNCs is consistent with that of the WIS. Interestingly, the CNCs exhibited typical cellulose II crystallites, which were significantly different from those of the cellulose feedstock (cellulose I). Detailed characterization revealed that the CNCs had tunable numberaveraged heights of 10.4−26.9 nm and high thermal stability (a maximal weight loss temperature of 327 °C). Most notably, FeCl 3 • 6H 2 O was easily recycled from the hydrolysate after hydrolysis, with a high recovery of 94.0−94.5 wt %, using simple concentration and crystallization technologies. Thus, this study proposes a novel production technology for CNCs that is both economical and ecofriendly, providing new ideas for clean and large-scale production of CNCs.

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Rapid, high-yield production of lignin-containing cellulose nanocrystals using recyclable oxalic acid dihydrate

Cited by 37 publications

References 49 publications

Superelastic and Ultralight Aerogel Assembled from Hemp Microfibers

Superelastic and Ultralight Aerogel Assembled from Hemp Microfibers

Production of lignin containing cellulose nanofibrils (CNF) after enzymatic treatment of curl-induced, unbleached kraft pulps

Cellulose Nanocrystal Preparation via Rapid Hydrolysis of Wood Cellulose Fibers Using Recyclable Molten Ferric Chloride Hexahydrate

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