Preparation method of nanocellulose ammonia gas induction aerogel

A technology of nano-cellulose and airgel, which is applied in the direction of analyzing materials through chemical reactions, observing the influence of chemical indicators on materials, instruments, etc., to achieve low density, high porosity, and high specific surface area Effect

Active Publication Date: 2022-07-26
TIANJIN UNIV OF SCI & TECH
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Problems solved by technology

In view of the various shortcomings of gas-sensing substrates and pigments, look for a material that is green and environmentally friendly and has a wide range of sources. After designing its structure, it can adsorb specific gases to produce color changes to determine the adsorption effect of gases, thereby improving Defects of Existing Thin Film Structures for Gas Adsorption

Method used

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  • Preparation method of nanocellulose ammonia gas induction aerogel
  • Preparation method of nanocellulose ammonia gas induction aerogel
  • Preparation method of nanocellulose ammonia gas induction aerogel

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Embodiment 1

[0048] The present embodiment provides a preparation method of nanocellulose ammonia gas induction aerogel with high specific surface area, comprising the following steps:

[0049] (1) Using eucalyptus wood bleached kraft pulp as raw material, nanocellulose was prepared by TEMPO-mediated oxidation method

[0050] 1) Weigh a certain amount of eucalyptus bleached kraft pulp, soak it in deionized water and stir it with a mixer for 2-3 hours to completely disperse it, then wash the fibers with deionized water for 2-3 times, and place the fibers in deionized water after suction filtration. A certain proportion of 0.5mol / L Na 2 CO 3 / NaHCO 3 A slurry with a pulp concentration of 1% was prepared from a mixed solution of a buffer solution and deionized water, and the slurry was put into a three-necked flask and stirred.

[0051]2) Weigh 1% of TEMPO and 10% of NaBr equivalent to the absolute dry pulp sample mass, put them in a beaker and add an appropriate amount of deionized water,...

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Abstract

The invention provides a nanocellulose ammonia gas induction aerogel with high specific surface area and a preparation method thereof. (1) Pretreatment of eucalyptus sulfate bleached pulp to prepare nanocellulose hydrogel; (2) Polyethylene The alcohol solution is added to the prepared nanocellulose hydrogel to prepare the polyvinyl alcohol / nanocellulose composite hydrogel; (3) the red radish pigment is fixed in situ on the polyvinyl alcohol / nanocellulose composite hydrogel The polyvinyl alcohol / red radish pigment / nanocellulose composite hydrogel was prepared on the fiber of the glue; (4) the polyvinyl alcohol / red radish pigment / nanocellulose composite aerogel was prepared by vacuum freeze-drying. The invention greatly enhances the adsorption capacity of ammonia gas and shortens the response time. The pH color responsiveness of radish red pigment plays a color indication role for the presence of ammonia gas, which can effectively monitor ppm level ammonia gas, and has good practicability in the field of food freshness indication.

Description

technical field [0001] The invention belongs to the field of packaging materials, relates to the technical field of gas indication and gas response, and in particular relates to a nanocellulose ammonia gas induction aerogel with high specific surface area and a preparation method thereof. Background technique [0002] In previous studies, there are many examples of using polyethylene, polylactic acid, starch, chitosan and other materials as the matrix to combine with pigments to make films for gas sensing in food packaging. Although polyethylene, polylactic acid and other materials are easy to obtain, they are not easy to degrade, easily pollute the environment and have low sensitivity to gas induction. Although film-forming substrates such as starch and chitosan are green and easy to degrade, their porosity is extremely low and the cost is high after film formation. Many of the pigments used in gas sensing are chemical dyes that are harmful to the human body. Aiming at th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/28C08J3/24C08L29/04C08L1/02C08K5/1545G01N21/78
CPCC08J9/28C08J3/246G01N21/783G01N2021/775C08J2301/02C08J2429/04
Inventor 张正健张国华张金珊陈凤宝刘光发陈蕴智
Owner TIANJIN UNIV OF SCI & TECH
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