Method for preparation of nano-cellulose whiskers from garlic skins

A nanocellulose and whisker technology, which is applied in fiber raw material processing, textiles and papermaking, etc., can solve the problems of time-consuming and labor-intensive, limiting the application and development of nano-cellulose whiskers with high aspect ratio, and cumbersome processes, etc. Achieve the effect of avoiding influence and harm, easy to implement, and simple process

Active Publication Date: 2014-03-19
SHANGHAI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, there is no direct preparation of garlic peel in the method of preparing nanocellulose, and there are difficult problems in the separation of plant fibers with high colloid content in the prior art, and the preparation of nanocellulose with high aspect ratio Most of them are made from artificially cultivated Acetobacter fibers, and the process is cumbersome, time-consuming and labor-intensive, which limits the composite application and development of nano-cellulose whiskers with high aspect ratio.

Method used

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  • Method for preparation of nano-cellulose whiskers from garlic skins
  • Method for preparation of nano-cellulose whiskers from garlic skins
  • Method for preparation of nano-cellulose whiskers from garlic skins

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Embodiment one: Specific steps are as follows:

[0029] (1) High-pressure swelling: put 2g of garlic skin into an autoclave, add 100g of Na with a mass percentage concentration of 2wt% 2 CO 3 Aqueous solution, place the autoclave in an oven at 120°C for 120 min, and filter / wash the mixture with suction; (2) Cooking and degumming: put the swollen and suction-filtered product into a reaction vessel, add 100 g of wt% NaOH aqueous solution was reacted in an oil bath at 120 °C for 4 h, and the mixture was suction filtered / washed; (3) polysaccharide extraction: the degummed product fiber was placed in 400 mL of 2% H 2 SO 4 In the aqueous solution, stir the reaction in an oil bath at a temperature of 90 °C for 2 h, and filter / wash again; (4) Bleaching treatment: Add 400 mL of 5wt% H 2 o 2 In the solution, adjust the pH value to 11.5 with NaOH, stir the reaction in an oil bath at 45 °C for 6 h, then cool to room temperature, and use 300 mL of 1.4 wt% NaClO to acidify 2 ...

Embodiment 2

[0031] Embodiment two: Specific steps are as follows:

[0032] (1) Cooking and screening: put 4 g of garlic skin into an autoclave, add 200 g of Na 2 CO 3 Aqueous solution, place the autoclave in an oven at 120°C for 120 min, and filter / wash the mixture with suction; (2) Cooking and degumming: put the swollen and suction-filtered product into a reaction vessel, add 200 g of wt% NaOH aqueous solution was reacted in an oil bath at 120 °C for 4 h, and the mixture was suction filtered / washed; (3) polysaccharide extraction: the degummed product fiber was placed in 600 mL of 2% H 2 SO 4 In the aqueous solution, stir the reaction in an oil bath at a temperature of 90 °C for 2 h, and filter / wash again; (4) Bleaching treatment: Add 400 mL of 5wt% H 2 o 2In the solution, adjust the pH value to 11.5 with NaOH, stir the reaction in an oil bath at 45 °C for 6 h, then cool to room temperature, and use 300 mL of 1.4 wt% NaClO to acidify 2 solution to continue bleaching with CH 3 Adj...

Embodiment 3

[0034] Embodiment three: The specific steps are as follows: this embodiment is basically the same as the second embodiment, the difference is: stirring and hydrolyzing in sulfuric acid solution for 8 h.

[0035] The transmission electron micrograph of the garlic peel nanocellulose prepared by the present embodiment is as follows: image 3 As shown, it can be seen from the figure that the garlic skin nanocellulose whiskers are needle-shaped, with a diameter of 20nm~30nm and a length of 300nm~2μm.

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Abstract

The invention relates to a method for preparation of nano-cellulose whiskers from garlic skins. Taking garlic skins as raw materials, the method includes the steps of: 1) conducting dipping swelling in a sodium carbonate solution; 2) performing cooking degumming by an alkali solution; 3) carrying out polysaccharide extraction; 4) implementing bleaching treatment; 5) conducting sanding treatment; 6) performing acidification hydrolysis; and 7) carrying out washing dialysis and freeze drying, etc. The garlic skin raw materials undergo component separation and conversion to be made into a nano-cellulose dispersion liquid with certain concentration, and the dispersion liquid is subjected to freeze drying to remove water, thus obtaining the nano-cellulose whiskers. The nano-cellulose whiskers prepared by the method provided by the invention is needle-shaped, presents good dispersion, and has a high length-diameter ratio, a diameter of 20nm-30nm, and a length of 300nm-2micrometers. The method provided by the invention adopts garlic skins as the raw materials to remove pectin and other impurities. After functional compounding, the prepared nano-cellulose whiskers have wide application value in the fields of optics, electrics, magnetics, biology and semiconductors, etc.

Description

technical field [0001] The invention relates to a method for preparing nanocellulose, in particular to a method for preparing nanocellulose whiskers by using garlic peels. Background technique [0002] In recent years, non-renewable energy sources such as natural gas, coal, and oil are facing shortages. Along with the rapid economic development, the huge demand for energy is having a huge impact on the world economy. While exports are growing, the development model of high energy consumption and high pollution is increasingly becoming the subject of concern. In order to solve this problem, it is necessary to increase the development and use of new energy, so as to better protect the environment under the premise of satisfying the development of circular economy. [0003] Cellulose is one of the most abundant natural polymers in nature, the main chemical component of plant fiber raw materials, and the most important and basic component for pulp and papermaking. Excellent a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21C5/00
Inventor 冯欣赵经鹏施利毅孟祥浩苗苗张淑平
Owner SHANGHAI UNIV
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