A kind of bio-based nanomaterial and preparation method thereof

A nano-material and bio-based technology, which is applied in the field of bio-based nano-materials and its preparation, can solve the problems of low generation rate and utilization rate of hydroxyl radicals, and achieve the effects of large number of free radicals, simple preparation process and stable reaction system

Active Publication Date: 2021-01-29
QINGDAO UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is the low generation rate and utilization rate of hydroxyl radicals

Method used

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  • A kind of bio-based nanomaterial and preparation method thereof
  • A kind of bio-based nanomaterial and preparation method thereof
  • A kind of bio-based nanomaterial and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] Grind 5g of bagasse into powder with a mixer and disperse it in 200mL of deionized water, add 15g of sodium persulfate, 3g of iron element and 3g of hydrogen peroxide, stir at 60°C for 2h, then use a cell pulverizer at 30% power for mechanical Treat for 20 minutes, then continue to react at 60° C. for 4 hours to stop the reaction to obtain bagasse hydrolyzate, and the total reaction time is 6 hours.

[0064] After the reaction, use a high-speed centrifuge to centrifuge the bagasse hydrolyzate at a speed of 8000rpm / min for 10 minutes, then take the precipitate and wash it repeatedly with deionized water and centrifuge until the upper layer is in a light blue or milky white suspension state, then dialyze the upper layer to its The pH value is the same or close to the pH value of deionized water, and ultrasonically disperses to obtain a stable dispersed cellulose nanocrystal suspension.

[0065] The measured average length of the obtained cellulose nanocrystals is 563 nm, ...

Embodiment 2

[0067] Grind 5g of bagasse into powder with a blender and disperse in 200mL of deionized water, add 15g of sodium persulfate, 3g of iron element and 3g of hydrogen peroxide, stir at 60°C for 3h, and then use a cell pulverizer at a power of 30% to mechanically Treat for 20 minutes to obtain bagasse hydrolyzate.

[0068] After the reaction, the obtained hydrolyzate is vacuum-filtered, and the precipitate is repeatedly washed and filtered with deionized water until the pH value of the precipitate is close to or the same as that of the deionized water, and a stable dispersed cellulose nanofiber suspension is obtained.

[0069] The measured average length of the obtained cellulose nanofibers was 812 nm, the average diameter was 42 nm, and the yield was 36%.

[0070] The morphology distribution of the prepared cellulose nanofibers is as follows: figure 1 ,from figure 1 It can be seen that the cellulose nanofibers prepared by this method have a typical rod-like structure and are ...

Embodiment 3

[0072] Crush 5g of crab shells into powder with a mixer and disperse them in 200mL of deionized water, add 15g of sodium persulfate, 3g of iron element and 3g of hydrogen peroxide, stir at 60°C for 2h, and then use a cell pulverizer at 30% power to process After 20 minutes, continue to react at 60°C for 2 hours to stop the reaction to obtain crab shell powder hydrolyzate, and the total reaction time is 4 hours.

[0073] After the reaction is over, use a high-speed centrifuge to centrifuge the obtained hydrolyzate at a speed of 8000rpm / min for 10min, then take the precipitate and wash it repeatedly with deionized water and centrifuge until the supernatant is in the state of a light blue or milky white suspension, and dialyze the supernatant to its pH The pH is the same as that of deionized water, and ultrasonically dispersed to obtain a stable dispersion of chitin nanocrystal suspension.

[0074] The obtained chitin nanocrystals have an average length of 438 nm, an average diam...

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Abstract

Embodiments of the present invention relate to a bio-based nanomaterial and a preparation method thereof. The preparation method of the bio-based nanomaterial provided by the embodiment of the present invention comprises the following steps: after pulverizing the biological raw material comprising green plants, the shells of crustaceans, the organs of molluscs and / or the cell walls of fungi, disperse them in a mixture containing persulfuric acid The hydrolysis reaction is carried out in the aqueous solution of the root activation system and the advanced oxidation technology system to obtain a hydrolyzate; the hydrolyzate is post-treated to obtain bio-based nanomaterials; wherein: the persulfate activation system includes reagents containing persulfate and persulfate Sulphate radical activator; the advanced oxidation technology system includes hydrogen peroxide and a reagent for generating hydroxyl radicals from hydrogen peroxide. The method for preparing bio-based nanomaterials provided by the invention has high preparation efficiency, fast reaction rate and low preparation cost. The embodiment of the present invention also provides the bio-based nanomaterial prepared by the above method.

Description

technical field [0001] The invention relates to a bio-based nanometer material and a preparation method thereof. Background technique [0002] Bio-based structural materials (such as cellulose, chitin, etc.) are the most abundant natural biological materials in nature, which are widely found in green plants, marine animals and other organisms. By removing unwanted organic or inorganic substances from green plants, shells of crustaceans, organs of molluscs, cell walls of fungi, etc. protein, pectin, etc., or remove the protein and minerals in shrimp shells, crab shells, squid bones, etc.), leaving nano-scale materials with a structure or size that meets the needs, and then you can obtain materials with specific morphology, structure, and size. Bio-based nanomaterials (such as cellulose nanocrystals, cellulose nanofibers, chitin nanocrystals, chitin nanofibers, etc.). [0003] Bio-based nanomaterials have the characteristics of low density, high strength, and high aspect rat...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08B15/02C08B37/08
CPCC08B15/02C08B37/003
Inventor 张建明周立娟段咏欣刘云霄王坤涛袁媛
Owner QINGDAO UNIV OF SCI & TECH
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