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Preparation method of nano-cellulose ammonia gas induction aerogel

A nanocellulose and aerogel technology, which is applied in the direction of analysis by chemical reaction of materials, material analysis by observing the influence on chemical indicators, instruments, etc., to achieve a simple preparation method, high porosity, good gas The effect of adsorption capacity

Active Publication Date: 2021-05-28
TIANJIN UNIV OF SCI & TECH
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  • Claims
  • Application Information

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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 nano-cellulose ammonia gas induction aerogel
  • Preparation method of nano-cellulose ammonia gas induction aerogel
  • Preparation method of nano-cellulose ammonia gas induction aerogel

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Embodiment 1

[0048]This embodiment provides a method of preparing a high proportional surface area nanocolysulin ammonia gas sensing gel, including the following steps:

[0049](1) Use TEMPO-mediated oxidation method to prepare nanoculine using TEMPO-mediated oxidation method using TEMPO-mediated sulfate.

[0050]1) Weigh a certain amount of eucalyptus bleaching sulfate slurry, soak it in the deionized water to stir the stirring 2-3H to completely disperse, then wash the fibers 2-3 times with deionized water, and filter the fibers after filtration A certain proportion of 0.5mol / L Na2CO3 / NAHCO3The buffer solution and the mixed solution of the deionized water were formulated into a pulp concentration of 1% of the pulp, and placed in a three-mouth flask and stirred.

[0051]2) TemPO and 10% of NABR corresponding to the quality of the dry pulp samples, respectively, are placed in a beaker and add an appropriate amount of deionized water, and then heat the treatment of 40 ° C water bath until it completely...

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Abstract

The invention provides a nano-cellulose ammonia gas induction aerogel with a high specific surface area, and a preparation method thereof. The preparation method comprises the following steps: (1) pretreating eucalyptus sulfate bleached pulp to prepare a nano-cellulose hydrogel; (2) adding a polyvinyl alcohol solution into the prepared nano-cellulose hydrogel to prepare a polyvinyl alcohol / nano-cellulose composite hydrogel; (3) fixing a radish red pigment on fibers of the polyvinyl alcohol / nano-cellulose composite hydrogel in situ to prepare a polyvinyl alcohol / radish red pigment / nano-cellulose composite hydrogel; and (4) preparing the polyvinyl alcohol / radish red pigment / nanocellulose composite aerogel by adopting a vacuum freeze drying method. According to the invention, the adsorption capacity to ammonia gas is greatly enhanced, and the response time is shortened. The pH color responsiveness of the radish red pigment is utilized to achieve a color indication effect on the existence of the ammonia gas, so that the ppm-level ammonia gas can be effectively monitored, and the method has good practicability in the fields of food freshness indication and the like.

Description

Technical field[0001]The present invention belongs to the field of packaging materials, and the technical field of gas instructions and gas response, and more particularly to a nanocolytic ammonia gas sensing gas gel having a high proportional surface area and a preparation method thereof.Background technique[0002]In the previous study, a film such as a matrix binding dye as a matrix binding pigment was made in a polyethylene, polylactic acid, starch, and chitosan, and a film for the gas induced in the food pack. Although the materials such as polyethylene, polylactic acid are easily acquired, but it is not easy to degrade, it is easy to pollute the environment and the sensitivity of the gas sensing is not high. Although the film and chitosan and the like a film formation substrate is highly degraded, the porosity is low and the cost is high. Many of the pigments applied to gas sensing are chemical dyes harmful to the human body. For the various disadvantages of gas induction substr...

Claims

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Application Information

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Patent Type & Authority Applications(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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