Controllable preparation method of nanocellulose by taking bagasse as raw material

A technology of nanocellulose and bagasse, which is used in raw material separation, fiber raw material treatment, washing/replacement of pulp treatment liquid, etc., can solve the problems of limiting the application of nanocellulose, destroying the internal structure of cellulose, etc., achieving short reaction time, Simple process and controllable content

CN114481658AActive Publication Date: 2022-05-13BEIHANG UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2022-05-13

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Abstract

The invention discloses a controllable preparation method of nanocellulose by taking bagasse as a raw material. The controllable preparation method comprises the following steps: pulping; water-soluble components are removed; alcohol-soluble components are removed; alkali treatment: adding a NaOH solution into the material treated in the step (3), carrying out ultrasonic dispersion, reacting for 12 hours, and then washing with a phosphoric acid buffer solution with the pH value of 6.8; tEMPO oxidation: dissolving the cellulose pulp treated in the step (4) by using a phosphate buffer solution with the pH value of 6.8, adding a proper amount of TEMPO, NaClO and NaClO2, and reacting under a heating condition; and (4) mechanical treatment: diluting and washing the reaction product obtained in the step (5) with deionized water, and then carrying out wall breaking treatment, centrifugal treatment and dialysis on the reaction product to obtain a nanocellulose solution. The nanocellulose prepared by the method has the advantages of good dispersity, controllable form, controllable surface carboxyl content and high yield.
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Description

technical field

[0001] The invention relates to the technical field of nanomaterials, in particular to a controllable preparation method of nanocellulose using bagasse as raw material. Background technique

[0002] Sugarcane is the most important sugar crop in my country. According to data from the National Bureau of Statistics and the China Sugar Association, the production of cane sugar in the 2019 / 20 crushing season is 9.0223 million tons, accounting for 87% of sugar production. The development of my country's sugarcane industry has made some progress, but it also faces many difficulties. For example, the disposal of bagasse waste has always been a problem. At present, there are still some areas that incinerate the remaining bagasse from sugar production. This treatment method will not only cause changes in the soil of the sugarcane field, which is not conducive to continuous farming, but also produce a large amount of carbon monoxide, carbon dioxide and other gases. Th...

Examples

preparation example Construction

[0032] The invention provides a method for the controllable preparation of nanocellulose using bagasse as raw material, comprising the following steps:

[0033] (1) Pulping: the bagasse after bleaching treatment is first subjected to wall-breaking treatment, and the wall-breaking treatment time is 15 minutes, then water is added and ultrasonically prepared to make sugarcane pulp, and the ultrasonic time is 10-30min, the ratio of solids to water in the prepared sugarcane pulp For 1g: (20-50)ml.

[0034] (2) Remove water-soluble components: the product of step (1) is diluted with deionized water, ultrasonically dispersed, and the ultrasonic time is 20min, and several times of centrifugation is performed to remove the supernatant;

[0035] (3) Removal of alcohol-soluble components: the product of step (2) is diluted with 98% alcohol in mass concentration, ultrasonically dispersed, and the ultrasonic time is 20min, and several times of centrifugation is carried out at a centrifuga...

Embodiment 1

[0041] A controllable preparation method of nanocellulose using bagasse as raw material, comprising the following steps:

[0042] (1) Get the industrial waste bagasse 1g that is bleached, carry out wall-breaking treatment, the wall-breaking treatment time is 15min, add 50ml water, ultrasonic 20min, centrifuge 10min under 11000rpm rotating speed, get precipitation, repeat three times;

[0043] (2) Dilute the product of step (1) with deionized water, disperse it by ultrasonic, the ultrasonic time is 20min, carry out several times of centrifugation, and remove the supernatant;

[0044] (3) Take 1 g of the precipitate obtained in step (2), add 50 ml of alcohol, ultrasonicate for 20 minutes, centrifuge at 11000 rpm for 10 minutes, take the precipitate, and repeat three times;

[0045] (4) Take 1 g of the precipitate obtained in step (3), add 50 ml of NaOH solution with a mass fraction of 10%, ultrasonicate for 20 minutes, and centrifuge for 10 minutes at 11000 rpm, take the precipi...

Embodiment 2

[0051] A controllable preparation method of nanocellulose using bagasse as raw material, comprising the following steps:

[0052] (1) Get the industrial waste bagasse 1g that is bleached, carry out wall-breaking treatment, the wall-breaking treatment time is 15min, add 50ml water, ultrasonic 20min, centrifuge 10min under 11000rpm rotating speed, get precipitation, repeat three times;

[0053] (2) Dilute the product of step (1) with deionized water, disperse it by ultrasonic, the ultrasonic time is 20min, carry out several times of centrifugation, and remove the supernatant;

[0054] (3) Take 1 g of the above-mentioned precipitate, add 50 ml of alcohol, sonicate for 20 minutes, centrifuge at 11000 rpm for 10 minutes, take the precipitate, and repeat three times;

[0055] (4) Take 1 g of the above-mentioned precipitate, add 50 ml of NaOH solution with a mass fraction of 10%, ultrasonicate for 20 minutes, and centrifuge for 10 minutes at 11000 rpm, take the precipitate, and repea...