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Preparation method of bamboo holocellulose nanofiber with high length-diameter ratio and high hemicellulose content

A technology of hemicellulose and nanofibers, applied in the direction of cellulose/protein conjugated artificial filaments, nanotechnology, fiber chemical characteristics, etc. low, can not fully meet the needs of use, etc., to achieve the effect of environmental friendliness, short time and easy operation

Active Publication Date: 2021-11-09
NANJING FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] CN110128555A discloses a method of obtaining cellulose nanocrystals by treating pretreated biomass as raw material with organic solvents, ionic liquids and cellulose solvents, However, it takes a long time to process and uses more organic solvents, and the highest yield of cellulose nanocrystals is 71%.
[0008] It can be seen that the existing nanocellulose preparation methods have less diversity in the chemical composition of the obtained nanofiber materials, high energy consumption, long processing time, and nanofibers. Problems such as low hemicellulose content cannot fully meet the needs of use

Method used

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  • Preparation method of bamboo holocellulose nanofiber with high length-diameter ratio and high hemicellulose content
  • Preparation method of bamboo holocellulose nanofiber with high length-diameter ratio and high hemicellulose content
  • Preparation method of bamboo holocellulose nanofiber with high length-diameter ratio and high hemicellulose content

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The preparation method of the bamboo heddled cellulose nanofiber with high aspect ratio and high hemicellulose content, the steps are as follows:

[0034] (1) Preparation of deep eutectic solvent (DES): zinc acetate (ZA) was used as hydrogen bond donor, choline chloride (ChCl) was used as hydrogen bond acceptor, and the molar ratio of donor and acceptor was 1:2. , the mixture was heated at 80 °C with magnetic stirring for 4 h until a homogeneous clear liquid appeared.

[0035] (2) Pretreatment: Add 0.5 g bamboo cellulose powder and 25 mL zinc acetate / choline chloride (ZAC) to the Teflon container of the microwave reactor. The solid-liquid ratio of bamboo cellulose powder and DES is 1:50 (g / mL), and acetic acid is added, and the molar ratio of acetic acid and DES is 1:1 (ZAC1-1) or 1:2 (ZAC2-1) , or 1:3 (ZAC3-1). Use a glass rod to stir to mix well. The mixture was treated at 120° C. for 10 minutes under a microwave irradiation power of 600 W. After pretreatment, the...

Embodiment 2

[0038] The preparation method of the bamboo heddled cellulose nanofiber with high aspect ratio and high hemicellulose content, the steps are as follows:

[0039] (1) Preparation of deep eutectic solvent (DES): zinc acetate (ZA) was used as hydrogen bond donor, choline chloride (ChCl) was used as hydrogen bond acceptor, and the molar ratio of donor and acceptor was 1:2. , the mixture was heated at 80 °C with magnetic stirring for 4 h until a homogeneous clear liquid appeared.

[0040] (2) Pretreatment: Add 0.5 g bamboo cellulose powder and 25 mL zinc acetate / choline chloride (ZAC) to the Teflon container of the microwave reactor. The solid-liquid ratio of bamboo cellulose powder and DES is 1:50 (g / mL), and acetic acid is added, and the molar ratio of acetic acid and DES is 1:1 (ZAC1-2), or 1:2 (ZAC2-2) , or 1:3 (ZAC3-2). Use a glass rod to stir to mix well. The mixture was treated at 140° C. for 10 minutes under a microwave irradiation power of 600 W. After pretreatment, th...

Embodiment 3

[0043] Six HCNF products named ZAC1-1, ZAC2-1, (ZAC3-1, ZAC1-2, ZAC2-2, ZAC3-2) prepared in Examples 1 and 2 were characterized, and the results are shown in Table 1. The specific method is as follows:

[0044] 1) The formula for calculating the recovery rate is: recovery rate=HCNF mass (g) / bamboo cellulose powder mass (g)*100%.

[0045] 2) AFM observation: Dilute the suspension of nanofiber cellulose by 0.5%, and drop it on a smooth mica sheet. After natural air-drying, use an atomic force microscope to observe the morphology of nanofibers, and obtain the average length (nm), average width (nm) and length Diameter ratio.

[0046] 3) Determination of crystallinity: the instrument used is X-ray diffractometer, crystallinity (%)=peak area of ​​crystalline region / (peak area of ​​crystalline region+peak area of ​​amorphous region)*100%.

[0047] 4) Determination of dextran and xylan content: adopt the special lignocellulosic component determination method of American Energy Labo...

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Abstract

The invention discloses a preparation method of bamboo holocellulose nanofiber with high length-diameter ratio and high hemicellulose content. The method comprises the following steps of treating bamboo holocellulose by adopting an acetic acid-assisted eutectic solvent under the condition of microwave radiation, performing solid-liquid separation after the treatment is finished, dispersing the solid, performing homogenizing, and preparing the bamboo holocellulose nanofiber through a micro-jet machine, wherein the length-diameter ratio of the bamboo holocellulose nanofiber is not less than 300, and the hemicellulose content is not less than 14%. According to the method, the length-diameter ratio of nano holocellulose (HCNF) can be effectively increased, and the hemicellulose content of the obtained HCNF and the acetylation degree of cellulose are relatively high; and the obtained bamboo nano holocellulose has the advantages of being adjustable in size, uniform in dispersion and the like. Meanwhile, the method also has the advantages of simple process, mild reaction conditions, environmental friendliness, easiness in operation and the like, and has relatively high application potential.

Description

technical field [0001] The invention relates to the technical field of cellulose treatment, in particular to a preparation method of bamboo heddle cellulose nanofibers with high aspect ratio and high hemicellulose content. Background technique [0002] In recent years, due to the increasingly severe environmental pollution and resource shortage, the exploration and research on nanostructured materials are gradually attracting people's attention, and renewable and sustainable materials from biomass have become a research hotspot. Environmentally friendly lignocellulosic resources not only have good renewability, but also have high potential for chemical or physical modification. Cellulose is the most abundant natural polymer on earth and is widely used as a raw material for functional applications. As the major component of lignocellulosic biomass, cellulose consists of D-glucopyranose linked by β(1-4) glycosidic linkages. Due to its unique two-phase and aggregated structur...

Claims

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Application Information

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IPC IPC(8): D01F8/02D01F8/18C08B3/06B82Y40/00
CPCD01F8/02D01F8/18C08B3/06B82Y40/00Y02P20/54
Inventor 凌喆谢滢孙婧涵勇强
Owner NANJING FORESTRY UNIV
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