Facile extraction of cellulose nanocrystals from wood using ethanol and peroxide solvothermal pretreatment followed by ultrasonic nanofibrillation

Li, Yanna; Liu, Yongzhuang; Chen, Wenshuai; Wang, Qingwen; Liu, Yixing; Li, Jian; Yu, Haipeng

doi:10.1039/c5gc02576a

Cited by 207 publications

(120 citation statements)

References 44 publications

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“…Previous works reporting CNC production by acid methods applied to sources of cellulose including eucalyptus showed the advantage of the enzymatic method and found similar ranges of length and diameter, with L = 175–142 nm and D = 11–15 nm for eucalyptus cellulose, L = 100–300 nm and D = 3–10 nm for waste paper, and L = 500 nm and D = 1–9 nm for wood . However, it is important to emphasize that obtaining CNC using enzymatic hydrolysis alone is innovative.…”

Section: Resultsmentioning

confidence: 92%

A new approach to obtain cellulose nanocrystals and ethanol from eucalyptus cellulose pulp via the biochemical pathway

Bondancia

Mattoso

Marconcini

et al. 2017

Biotechnology Progress

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The feasibility of integration of cellulosic ethanol production with the manufacture of cellulose nanofibers (CNF) and cellulose nanocrystals (CNC) was evaluated using eucalyptus cellulose pulp as feedstock and employing the biochemical route alone. For the enzymatic hydrolysis step, experimental central composite design (CCD) methodology was used as a tool to evaluate the effects of solids loading (SL) and enzymatic loading (EL) on glucose release and cellulose conversion. Glucose concentrations from 45 to 125 g/L were obtained after 24 h, with cellulose conversions from 35 to 96%. Validation of the statistical model was performed at SL of 20% and EL of 10 mg protein/g, which was defined by the desirability function as the optimum condition. The sugars released were used for the production of ethanol by Saccharomyces cerevisiae, resulting in 62.1 g/L ethanol after 8 h (yield of 95.5%). For all the CCD experimental conditions, the residual solids presented CNF characteristics. Moreover, the use of a new strategy with temperature reduction from 50 to 35°C after 24 h of enzymatic hydrolysis enabled CNC to be obtained after 144 h. The CNC showed a crystallinity index of 83%, length of 260 nm, diameter of 15 nm, and aspect ratio (L/D) of 15. These characteristics are suitable for many applications, such as reinforcement in polymeric materials and other lower volume higher value bio-based products. The findings indicate the viability of obtaining ethanol and CNC using the biochemical route exclusively, potentially contributing to the future implementation of forest biorefineries. © 2017 American Institute of Chemical Engineers Biotechnol. Prog., 33:1085-1095, 2017.

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Section: Resultsmentioning

confidence: 92%

A new approach to obtain cellulose nanocrystals and ethanol from eucalyptus cellulose pulp via the biochemical pathway

Bondancia

Mattoso

Marconcini

et al. 2017

Biotechnology Progress

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“…In recent years, ionic liquids such as 1-butyl-3-methylimidazolium hydrogen sulfate (BmimHSO4) have been proposed as a potential hydrolyzing catalyst for cellulose depolymerization process, and the results showed that high crystallinity nanocellulose (95.8%) was isolated successfully from cotton linter model compound (84.4%) via ionic liquid catalyzed hydrolysis process by using BmimHSO4 at 90 o C for 1.5 h (Tan et al 2015). In the same year, a new hydrolysis approach which comprised ethanol and peroxide solvothermal pretreatment followed by ultrasonic process has been developed by Li and his coworkers for isolation of nanocellulose (Li et al 2016). They treated the wood flour with the proposed pretreatment under reaction conditions of 180 o C for 80 min, and the results revealed that the nanocellulose produced had higher crystallinity (79.37%) than raw material (70.72%) (Li et al 2016).…”

Section: Introductionmentioning

confidence: 99%

“…In the same year, a new hydrolysis approach which comprised ethanol and peroxide solvothermal pretreatment followed by ultrasonic process has been developed by Li and his coworkers for isolation of nanocellulose (Li et al 2016). They treated the wood flour with the proposed pretreatment under reaction conditions of 180 o C for 80 min, and the results revealed that the nanocellulose produced had higher crystallinity (79.37%) than raw material (70.72%) (Li et al 2016). In spite of their prolific use, the capital cost for the nanocellulose production is one of the major concerns in the industrial applications.…”

Section: Introductionmentioning

confidence: 99%

“…The utilization of ionic liquid is restricted for industrial scale applications due to most of the ionic liquids are expensive, incomplete chemical and toxicological data, and the process for recovery of the ionic liquid is a highly energy-consuming process . On the other hand, the application of ethanol and peroxide solvothermal hydrolysis approach for conversion of cellulose is always requires harsher conditions such as high temperature and longer pretreatment period (Li et al 2016). Thus, from an economic viewpoint, this will eventually increase the capital cost of the production line and unfavorable for long term production in the industrial use.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Nanostructured Cellulose via Cr(III)- and Mn(II)-Transition Metal Salt Catalyzed Acid Hydrolysis Approach

Chen¹,

Lee²,

Hamid³

2016

BioResources

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Nanostructured cellulose was successfully prepared from native cellulose using a homogeneous catalytic H2SO4 hydrolysis pathway in the presence of Cr(III)-and Mn(II)-transition metal salts as the co-catalyst. The effect of transition metal salts with different valence states (Cr 3+ and Mn 2+) on the physicochemical properties (chemical characteristics, crystallinity index, nano-structure, thermal stability, and morphology) of prepared nanocellulose was investigated. Interestingly, TEM micrographs showed that the Cr(III)-treated and Mn(II)-treated nanocellulose exhibited a weblike nanostructured-surface with average diameters of 44.7 ± 13.2 nm and 58.4 ± 15.3 nm, respectively. XRD study revealed that the crystallinity of nanocellulose was increased because the catalytic degradation of the less crystalline regions of cellulose occurred at a faster rate than its crystalline phases. Cr(III)-treated nanocellulose was capable of rendering a higher crystallinity index (75.6 ± 0.1%) compared with Mn(II)-treated nanocellulose (72.3 ± 0.4%). Furthermore, a dynamic light scattering (DLS) study revealed that Cr(III)-treated nanocellulose showed a smaller distribution range (92% at 14 to 135 nm) compared with Mn(II)-treated nanocellulose (92% at 607 nm). A higher valence state for the Cr(III)-cation, with a trivalent state (+3), rendered a more effective hydrolysis reaction compared with the Mn(II)-cation, with a divalent state (+2), for preparing the nanocellulose.

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“…Wood has been used to build structures such as bridges, house, towers, and furniture from ancient times to present day . Compared with the manufacturing processes of steel, concrete, and other construction materials, wood processing not only reduces the energy consumption but also results in a positive contribution to the carbon footprint due to its green and environmentally friendly characteristics . Despite these attractive features, wood still faces challenges in the modern construction industry because of its high fire risk.…”

Section: Introductionmentioning

confidence: 99%

Fire‐Resistant Structural Material Enabled by an Anisotropic Thermally Conductive Hexagonal Boron Nitride Coating

Gan

Chen

Wang

et al. 2020

Adv Funct Materials

118

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Fire retardant coatings have been proven effective at reducing the heat release rate (HRR) of structural materials during burning; yet effective methods for increasing the ignition temperature and delay time prior to burning are rarely reported. Herein, a strong, fire‐resistant wood structural material is developed by combining a densification treatment with an anisotropic thermally conductive flame‐retardant coating of hexagonal boron nitride (h‐BN) nanosheets to produce BN‐densified wood. The thermal management properties created by the BN coating provide fast, in‐plane thermal diffusion, slowing the conduction of heat through the densified wood, which improves the material's ignition properties. Compared with densified wood without the BN coating, a 41 °C enhancement in ignition temperature (Tig), a twofold increase in ignition delay time (tig), and a 25% decrease in the maximum HRR of BN‐densified wood can be achieved. As a proof of concept for scalability, the pieces of the BN‐densified wood are fabricated with a length larger than 25 cm, width greater than 15 cm, and thickness more than 7 mm. The improved thermal management, fire resistance, mechanical strength, and scalable production of BN‐densified wood position it as a promising structural material for safe and energy‐efficient buildings.

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Facile extraction of cellulose nanocrystals from wood using ethanol and peroxide solvothermal pretreatment followed by ultrasonic nanofibrillation

Abstract: Cellulose nanocrystals (CNCs) were successfully extracted from wood flour by a two-step process that comprised ethanol and peroxide solvothermal pretreatment and an ultrasonic disintegration process.

Cited by 207 publications

References 44 publications

A new approach to obtain cellulose nanocrystals and ethanol from eucalyptus cellulose pulp via the biochemical pathway

A new approach to obtain cellulose nanocrystals and ethanol from eucalyptus cellulose pulp via the biochemical pathway

Preparation of Nanostructured Cellulose via Cr(III)- and Mn(II)-Transition Metal Salt Catalyzed Acid Hydrolysis Approach

Fire‐Resistant Structural Material Enabled by an Anisotropic Thermally Conductive Hexagonal Boron Nitride Coating

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