CN114425307B - Biomass aerogel material based on color response mechanism, preparation method and application - Google Patents

Biomass aerogel material based on color response mechanism, preparation method and application Download PDF

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CN114425307B
CN114425307B CN202111405607.4A CN202111405607A CN114425307B CN 114425307 B CN114425307 B CN 114425307B CN 202111405607 A CN202111405607 A CN 202111405607A CN 114425307 B CN114425307 B CN 114425307B
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chitosan
carboxymethyl cellulose
aerogel material
solution
nickel chloride
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CN114425307A (en
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杨维本
高超
尹中龙
杨朕
符嫦娥
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Nanjing Normal University
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Nanjing Normal University
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    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/28—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof by elimination of a liquid phase from a macromolecular composition or article, e.g. drying of coagulum
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    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
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    • B01J20/04—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of alkali metals, alkaline earth metals or magnesium
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    • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
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    • B01J20/28—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties
    • B01J20/28014—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof characterised by their form or physical properties characterised by their form
    • B01J20/28047—Gels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/40—Nitrogen compounds
    • B01D2257/406—Ammonia
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J2205/00—Foams characterised by their properties
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J2301/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
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    • C08J2301/26—Cellulose ethers
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J2305/00—Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2301/00 or C08J2303/00
    • C08J2305/08—Chitin; Chondroitin sulfate; Hyaluronic acid; Derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J2401/00—Characterised by the use of cellulose, modified cellulose or cellulose derivatives
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    • C08J2401/26—Cellulose ethers
    • C08J2401/28—Alkyl ethers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08J2405/00—Characterised by the use of polysaccharides or of their derivatives not provided for in groups C08J2401/00 or C08J2403/00
    • C08J2405/08—Chitin; Chondroitin sulfate; Hyaluronic acid; Derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/16—Halogen-containing compounds

Abstract

The invention discloses a biomass aerogel material based on a color response mechanism, a preparation method and application thereof. The biomass aerogel material comprises carboxymethyl cellulose, chitosan, lithium bromide and nickel chloride; the mass ratio of the carboxymethyl cellulose to the chitosan is 0.2-4:l; the mass ratio of the nickel chloride to the carboxymethyl cellulose is 0.1-4.8:1; the mass ratio of the lithium bromide to the chitosan is 0.1-3:1. According to the invention, two natural polymer biomass materials are used as matrixes, lithium bromide is used as a cross-linking agent, the composite biomass aerogel adsorbent is prepared through a non-toxic and environment-friendly process, the adsorption performance of the aerogel on ammonia gas is improved, and the adsorption condition can be judged through a color response mechanism, so that the ammonia gas adsorption process is visualized.

Description

Biomass aerogel material based on color response mechanism, preparation method and application
Technical Field
The invention belongs to the technical field of preparation of visualized ammonia adsorbents, and particularly relates to a biomass aerogel material based on a color response mechanism, a preparation method and application thereof.
Background
Ammonia is a colorless, but toxic gas with a strong irritating odor. The minimum concentration of ammonia which can be sensed by a human body is 5.3ppm, when the concentration is high, a strong pungent odor exists, the skin tissue contacted with the ammonia can be corroded and stimulated, the human tissue can be greatly damaged, symptoms such as lacrimation, pharyngalgia, chest distress, headache, nausea and dyspnea can occur after a large amount of ammonia is inhaled for a short time, and pulmonary edema and respiratory distress syndrome can occur in severe cases.
With the gradual aggravation of ammonia pollution, the production and the living of people are seriously influenced, and the ammonia emission is required to be controlled. The ammonia pollution in indoor air mainly comes from indoor decoration materials, most of additives and whitening agents used in furniture coating contain ammonia water, and meanwhile, high-alkali concrete expansion agents and urea-containing concrete antifreezing agents in building materials slowly release ammonia, and the indoor ammonia content is regulated to be less than 0.2mg/m according to indoor air quality standards 3 (1 hour mean). Therefore, in order to solve the problem of serious ammonia pollution, we need to develop a material with a specific removal effect on ammonia, and judge the adsorption saturation degree of ammonia through color change, so as to be convenient for replacing the adsorbent in time.
The chitosan is natural polymer polysaccharide prepared from chitin in shells of shellfish such as crab and lobster by deacetylation, and has good biocompatibility, biodegradability and biocompatibility. As the molecular chain of the chitosan has rich hydroxyl groups, the chitosan has good adsorption performance on various pollutants, and is a common adsorbent material, so the chitosan has a wide interest in the treatment application of industrial three wastes. Among various types of chitosan-based adsorption materials (powder, gel particles, films, hydrogels and aerogel), aerogel has the highest specific surface area and lighter weight, and can effectively utilize adsorption sites of chitosan, so that a degradable biological adsorbent is prepared. However, chitosan aerogel has poor acid and alkali resistance, poor mechanical properties and low ammonia adsorption efficiency. Cellulose is used as a structural material with better performance and is rich in carboxyl groups, so that chitosan and cellulose are mutually connected to form the composite aerogel for efficiently removing ammonia gas.
Disclosure of Invention
The invention aims to: aiming at the problem of removing ammonia without color in the prior art in a visual way, the invention provides a biomass aerogel material based on a color response mechanism, a preparation method and application thereof. According to the metal-loaded polymer biomass composite adsorbent, natural biological macromolecules are used as base materials, and two polymer biomass materials are mixed and copolymerized to prepare the aerogel material with higher specific surface area and lower density. And the color can be intuitively seen to be changed from yellow to blue-green before and after ammonia adsorption.
The technical scheme is as follows: the biomass aerogel material based on the color response mechanism comprises carboxymethyl cellulose, chitosan, lithium bromide and nickel chloride; the mass ratio of the carboxymethyl cellulose to the chitosan is 0.2-4:l; the mass ratio of the nickel chloride hexahydrate to the carboxymethyl cellulose is 0.1-0.48:1; the mass ratio of the nickel chloride to the chitosan is 0.1-3:1.
As a preferred embodiment of the present invention, the biomass aerogel material is prepared by the following method: adding carboxymethyl cellulose and nickel chloride hexahydrate into distilled water according to a proportion, and stirring to obtain a colloidal solution I containing carboxymethyl cellulose; dissolving chitosan and lithium bromide in an acidic solution according to a proportion, and stirring to obtain a colloid solution II containing chitosan; and mixing the two solutions in proportion, and freeze-drying to obtain the biomass aerogel material.
As a preferred embodiment of the invention, the mass concentration of the carboxymethyl cellulose in the colloidal solution I is 1-20%; in the colloid solution II, the mass concentration of the chitosan is 1-10%.
As a preferred embodiment of the present invention, the carboxymethyl cellulose has a viscosity average molecular weight of 5 to 30 ten thousand; the viscosity average molecular weight of the chitosan is 5-30 ten thousand.
As a preferred embodiment of the present invention, the carboxymethyl cellulose has a viscosity average molecular weight of 15 to 30 ten thousand; the viscosity average molecular weight of the chitosan is 15-30 ten thousand.
As a preferred embodiment of the present invention, the carboxymethyl cellulose has a viscosity average molecular weight of 25 to 30 ten thousand; the viscosity average molecular weight of the chitosan is 25-30 ten thousand.
The preparation method of the biomass aerogel material based on the color response mechanism comprises the following steps:
(1) Preparation of colloidal solution I: adding carboxymethyl cellulose and nickel chloride hexahydrate into distilled water, stirring for dissolving, and adjusting the mass concentration of the carboxymethyl cellulose to 1-20%;
(2) Preparation of colloidal solution II: dissolving chitosan and lithium bromide in an acidic solution, stirring and dissolving, and adjusting the mass concentration of the chitosan to be 1-10%, wherein the mass ratio of the lithium bromide to the chitosan is 0.1-3:1;
(3) Adding the colloidal solution I into the colloidal solution II according to the mass ratio of the carboxymethyl cellulose to the chitosan of 0.2-4:l, continuously stirring until the mixed solution is completely and uniformly stirred to form hydrogel, and then freeze-drying.
As a preferred embodiment of the present invention, the method for preparing a biomass aerogel material comprises the following steps:
(1) Preparation of colloidal solution I: adding carboxymethyl cellulose and nickel chloride hexahydrate into distilled water according to a proportion, stirring for 1-6 hours at 500-1000rpm at room temperature, adjusting the concentration of the carboxymethyl cellulose to 1-20%, and fully dissolving the concentration of the nickel chloride hexahydrate to 0.1-48%, wherein the solution is in a green colloid shape;
(2) Preparation of colloidal solution II: dissolving chitosan and lithium bromide in an acid solution according to a proportion, and stirring for 10-48 hours at 300-1000rpm to obtain a chitosan colloid solution II containing 1-10%;
(3) Adding the colloidal solution I into the colloidal solution II, continuously stirring at 500-1000rpm until the mixed solution is completely and uniformly stirred to form hydrogel, and freeze-drying the formed hydrogel.
In a preferred embodiment of the present invention, in the step (2), the acid solution is a hydrochloric acid solution or an acetic acid solution having a mass concentration of 0.1 to 2%.
In a preferred embodiment of the present invention, in step (3), the freeze-drying is performed by: freezing the obtained hydrogel at the temperature of minus 20 ℃ for 8-24 hours, and freeze-drying the reacted solid for 1-3d to obtain the biomass aerogel material.
The biomass aerogel material or the biomass aerogel material prepared by the preparation method disclosed by the invention is applied to ammonia adsorbents.
The beneficial effects are that: according to the invention, the metal-loaded polymer biomass composite adsorbent is prepared by mixing and copolymerizing two polymer biomass materials by taking natural biomacromolecules as a base material, so that the aerogel material with higher specific surface area and lower density is prepared. And the color can be intuitively seen to be changed from yellow to blue-green before and after ammonia adsorption.
Drawings
FIG. 1 is a Fourier infrared spectrum of the composite biomass aerogel synthesized in example 1 before and after adsorption;
FIG. 2 ammonia adsorption capacity under laboratory conditions for examples 1-8;
fig. 3 shows the color change before and after adsorption of the composite biomass aerogel in example 1.
Detailed Description
Example 1: preparation of biomass aerogel materials
(1) And (3) weighing carboxymethyl cellulose, adding the carboxymethyl cellulose into an aqueous solution with the pH value of 7 (the viscosity average molecular weight is 30 ten thousand, the mass ratio of the carboxymethyl cellulose to water is 3:100), taking nickel chloride hexahydrate, adding the nickel chloride hexahydrate into water (the mass ratio of the nickel chloride hexahydrate to water is 1:10), and stirring (the magnetic rotation speed is 500 r/min) to fully dissolve the nickel chloride hexahydrate and the carboxymethyl cellulose into a green colloid solution.
(2) Weighing chitosan and lithium bromide, putting the chitosan and the lithium bromide into an acid solution (the viscosity average molecular weight of the chitosan is 30 ten thousand, the mass ratio of the chitosan to the hydrochloric acid to the lithium bromide to the water is 3:1:1:100), and stirring (the magnetic rotation speed is 500 r/min) to fully dissolve the chitosan.
(3) Adding the mixed colloidal solution of the carboxymethyl cellulose and the nickel chloride hexahydrate prepared in the step (1) into the chitosan and lithium bromide colloidal solution prepared in the step (2), and fully stirring (the mass ratio of the two colloidal solutions is 1:1) to fully mix the two colloids to form a green colloid. Freezing the obtained hydrogel into a block solid at the temperature of minus 20 ℃, and then placing the block solid in a freeze dryer for freeze drying for 2 days to form the porous composite biomass aerogel material.
Fourier infrared spectra of the biomass aerogel prepared in the example 1 before and after adsorption are shown in fig. 1, and color changes before and after adsorption of ammonia gas are shown in fig. 3.
Example 2: preparation of biomass aerogel materials
(1) And (3) weighing carboxymethyl cellulose, adding the carboxymethyl cellulose into an aqueous solution with the pH value of 7 (the viscosity average molecular weight is 30 ten thousand, the mass ratio of the carboxymethyl cellulose to water is 4:100), taking nickel chloride hexahydrate, adding the nickel chloride hexahydrate into water (the mass ratio of the nickel chloride hexahydrate to the water is 1.2:10), and stirring (the magnetic rotation speed is 500 r/min) to fully dissolve the nickel chloride hexahydrate and the carboxymethyl cellulose into a green colloid solution.
(2) Weighing chitosan and lithium bromide, putting the chitosan and the lithium bromide into an acid solution (the viscosity average molecular weight of the chitosan is 30 ten thousand, the mass ratio of the chitosan to the hydrochloric acid to the lithium bromide to the water is 3:1:1:100), and stirring (the magnetic rotation speed is 500 r/min) to fully dissolve the chitosan.
(3) Adding the mixed colloidal solution of the carboxymethyl cellulose and the nickel chloride hexahydrate prepared in the step (1) into the chitosan and lithium bromide colloidal solution prepared in the step (2), and fully stirring (the mass ratio of the two colloidal solutions is 1:1) to fully mix the two colloids to form a green colloid. Freezing the obtained hydrogel into a block solid at the temperature of minus 20 ℃, and then placing the block solid in a freeze dryer for freeze drying for 2 days to form the porous composite biomass aerogel material.
Example 3: preparation of biomass aerogel materials
(1) And (3) weighing carboxymethyl cellulose, adding the carboxymethyl cellulose into an aqueous solution with the pH value of 7 (the viscosity average molecular weight is 30 ten thousand, the mass ratio of the carboxymethyl cellulose to water is 5:100), taking nickel chloride hexahydrate, adding the nickel chloride hexahydrate into water (the mass ratio of the nickel chloride hexahydrate to the water is 1.4:10), and stirring (the magnetic rotation speed is 500 r/min) to fully dissolve the nickel chloride hexahydrate and the carboxymethyl cellulose into a green colloid solution.
(2) Weighing chitosan and lithium bromide, putting the chitosan and the lithium bromide into an acid solution (the viscosity average molecular weight of the chitosan is 30 ten thousand, the mass ratio of the chitosan to the hydrochloric acid to the lithium bromide to the water is 3:1:1:100), and stirring (the magnetic rotation speed is 500 r/min) to fully dissolve the chitosan.
(3) Adding the mixed colloidal solution of the carboxymethyl cellulose and the nickel chloride hexahydrate prepared in the step (1) into the chitosan and lithium bromide colloidal solution prepared in the step (2), and fully stirring (the mass ratio of the two colloidal solutions is 1:1) to fully mix the two colloids to form a green colloid. Freezing the obtained hydrogel into a block solid at the temperature of minus 20 ℃, and then placing the block solid in a freeze dryer for freeze drying for 2 days to form the porous composite biomass aerogel material.
Example 4: preparation of biomass aerogel materials
(1) And (3) weighing carboxymethyl cellulose, adding the carboxymethyl cellulose into an aqueous solution with the pH value of 7 (the viscosity average molecular weight is 30 ten thousand, the mass ratio of the carboxymethyl cellulose to water is 5:100), taking nickel chloride hexahydrate, adding the nickel chloride hexahydrate into water (the mass ratio of the nickel chloride hexahydrate to the water is 1.6:10), and stirring (the magnetic rotation speed is 500 r/min) to fully dissolve the nickel chloride hexahydrate and the carboxymethyl cellulose into a green colloid solution.
(2) Weighing chitosan and lithium bromide, putting the chitosan and the lithium bromide into an acid solution (the viscosity average molecular weight of the chitosan is 30 ten thousand, the mass ratio of the chitosan to the hydrochloric acid to the lithium bromide to the water is 3:1:1:100), and stirring (the magnetic rotation speed is 500 r/min) to fully dissolve the chitosan.
(3) Adding the mixed colloidal solution of the carboxymethyl cellulose and the nickel chloride hexahydrate prepared in the step (1) into the chitosan and lithium bromide colloidal solution prepared in the step (2), and fully stirring (the mass ratio of the two colloidal solutions is 2:1) to fully mix the two colloids to form a green colloid. Freezing the obtained hydrogel into a block solid at the temperature of minus 20 ℃, and then placing the block solid in a freeze dryer for freeze drying for 2 days to form the porous composite biomass aerogel material.
Example 5: preparation of biomass aerogel materials
(1) And (3) weighing carboxymethyl cellulose, adding the carboxymethyl cellulose into an aqueous solution with the pH value of 7 (the viscosity average molecular weight is 30 ten thousand, the mass ratio of the carboxymethyl cellulose to water is 5:100), taking nickel chloride hexahydrate, adding the nickel chloride hexahydrate into water (the mass ratio of the nickel chloride hexahydrate to the water is 1.8:10), and stirring (the magnetic rotation speed is 500 r/min) to fully dissolve the nickel chloride hexahydrate and the carboxymethyl cellulose into a green colloid solution.
(2) The chitosan and lithium bromide are weighed and put into an acid solution (the viscosity average molecular weight of the chitosan is 30 ten thousand, the mass ratio of the chitosan, the hydrochloric acid, the lithium bromide and the water is 3:1:1:100), and stirring is carried out (the magnetic rotation speed is 500 r/min), so that the chitosan is fully dissolved.
(3) Adding the mixed colloidal solution of the carboxymethyl cellulose and the nickel chloride hexahydrate prepared in the step (1) into the chitosan and lithium bromide colloidal solution prepared in the step (2), and fully stirring (the mass ratio of the two colloidal solutions is 2:1) to fully mix the two colloids to form a green colloid. Freezing the obtained hydrogel into a block solid at the temperature of minus 20 ℃, and then placing the block solid in a freeze dryer for freeze drying for 2 days to form the porous composite biomass aerogel material.
Example 6: preparation of biomass aerogel materials
(1) And (3) weighing carboxymethyl cellulose, adding the carboxymethyl cellulose into an aqueous solution with the pH value of 7 (the viscosity average molecular weight is 30 ten thousand, the mass ratio of the carboxymethyl cellulose to water is 5:100), taking nickel chloride hexahydrate, adding the nickel chloride hexahydrate into water (the mass ratio of the nickel chloride hexahydrate to water is 2:10), and stirring (the magnetic rotation speed is 500 r/min) to fully dissolve the nickel chloride hexahydrate and the carboxymethyl cellulose into a green colloid solution.
(2) The chitosan and lithium bromide are weighed and put into an acid solution (the viscosity average molecular weight of the chitosan is 30 ten thousand, the mass ratio of the chitosan, the hydrochloric acid, the lithium bromide and the water is 3:1:1:100), and stirring is carried out (the magnetic rotation speed is 500 r/min), so that the chitosan is fully dissolved.
(3) Adding the mixed colloidal solution of the carboxymethyl cellulose and the nickel chloride hexahydrate prepared in the step (1) into the chitosan and lithium bromide colloidal solution prepared in the step (2), and fully stirring (the mass ratio of the two colloidal solutions is 2:1) to fully mix the two colloids to form a green colloid. Freezing the obtained hydrogel into a block solid at the temperature of minus 20 ℃, and then placing the block solid in a freeze dryer for freeze drying for 2 days to form the porous composite biomass aerogel material.
Example 7: preparation of biomass aerogel materials
(1) And (3) weighing carboxymethyl cellulose, adding the carboxymethyl cellulose into an aqueous solution with the pH value of 7 (the viscosity average molecular weight is 30 ten thousand, the mass ratio of the carboxymethyl cellulose to water is 5:100), taking nickel chloride hexahydrate, adding the nickel chloride hexahydrate into water (the mass ratio of the nickel chloride hexahydrate to water is 2:10), and stirring (the magnetic rotation speed is 500 r/min) to fully dissolve the nickel chloride hexahydrate and the carboxymethyl cellulose into a green colloid solution.
(2) The chitosan and lithium bromide are weighed and put into an acid solution (the viscosity average molecular weight of the chitosan is 30 ten thousand, the mass ratio of the chitosan, the hydrochloric acid, the lithium bromide and the water is 3:1:1:100), and stirring is carried out (the magnetic rotation speed is 500 r/min), so that the chitosan is fully dissolved.
(3) Adding the mixed colloidal solution of the carboxymethyl cellulose and the nickel chloride hexahydrate prepared in the step (1) into the chitosan and lithium bromide colloidal solution prepared in the step (2), and fully stirring (the mass ratio of the two colloidal solutions is 3:1) to fully mix the two colloids to form a green colloid. Freezing the obtained hydrogel into a block solid at the temperature of minus 20 ℃, and then placing the block solid in a freeze dryer for freeze drying for 2 days to form the porous composite biomass aerogel material.
Example 8: preparation of biomass aerogel materials
And (3) weighing carboxymethyl cellulose, adding the carboxymethyl cellulose into an aqueous solution with the pH value of 7 (the viscosity average molecular weight is 30 ten thousand, the mass ratio of the carboxymethyl cellulose to water is 5:100), taking nickel chloride hexahydrate, adding the nickel chloride hexahydrate into water (the mass ratio of the nickel chloride hexahydrate to the water is 2.4:10), and stirring (the magnetic rotation speed is 500 r/min) to fully dissolve the nickel chloride hexahydrate and the carboxymethyl cellulose into a green colloid solution.
(2) The chitosan and lithium bromide are weighed and put into an acid solution (the viscosity average molecular weight of the chitosan is 30 ten thousand, the mass ratio of the chitosan, the hydrochloric acid, the lithium bromide and the water is 3:1:1:100), and stirring is carried out (the magnetic rotation speed is 500 r/min), so that the chitosan is fully dissolved.
(3) Adding the mixed colloidal solution of the carboxymethyl cellulose and the nickel chloride hexahydrate prepared in the step (1) into the chitosan and lithium bromide colloidal solution prepared in the step (2), and fully stirring (the mass ratio of the two colloidal solutions is 3:1) to fully mix the two colloids to form a green colloid. Freezing the obtained hydrogel into a block solid at the temperature of minus 20 ℃, and then placing the block solid in a freeze dryer for freeze drying for 2 days to form the porous composite biomass aerogel material.
2. Ammonia adsorption experiment
The ammonia adsorption experiment method comprises taking a cuboid-like adsorbent of 1.5cm×1cm×0.1cm from the porous composite biomass aerogel materials prepared in examples 1-8, and placing ammonia gas with concentration of 3000mg/m 3 In an 8L sealed organic glass cover, the residual concentration of ammonia gas was measured after 12 hours, and the adsorption amount (mg/g) of ammonia gas per gram of porous material was calculated, and the result was shown in FIG. 2.
The variation of the porous composite biomass aerogel material of example 1 before and after adsorption is shown in fig. 3.

Claims (7)

1. The application of the biomass aerogel material based on the color response mechanism in ammonia gas adsorption is characterized in that the biomass aerogel material is prepared by the following steps: adding carboxymethyl cellulose and nickel chloride hexahydrate into distilled water according to a proportion, and stirring to obtain a colloidal solution I containing carboxymethyl cellulose; dissolving chitosan and lithium bromide in an acidic solution according to a proportion, and stirring to obtain a colloid solution II containing chitosan; mixing the two solutions in proportion, and freeze-drying to obtain a biomass aerogel material; the mass ratio of the carboxymethyl cellulose to the chitosan is 0.2-4:l; the mass ratio of the nickel chloride hexahydrate to the carboxymethyl cellulose is 0.1-4.8:1; the mass ratio of the lithium bromide to the chitosan is 0.1-3:1.
2. The use of a color response mechanism based biomass aerogel material in ammonia gas adsorption according to claim 1, wherein the mass concentration of carboxymethyl cellulose in the colloidal solution i is 1-20%; in the colloid solution II, the mass concentration of the chitosan is 1-10%.
3. The application of the biomass aerogel material based on the color response mechanism in ammonia adsorption according to claim 1, wherein the viscosity average molecular weight of the carboxymethyl cellulose is 5-30 ten thousand; the viscosity average molecular weight of the chitosan is 5-30 ten thousand.
4. The use of a color response mechanism based biomass aerogel material in ammonia adsorption according to claim 1, wherein the preparation method of the biomass aerogel material comprises the following steps:
(1) Preparation of colloidal solution I: adding carboxymethyl cellulose and nickel chloride hexahydrate into distilled water, stirring at 500-1000rpm at room temperature for 1-6h, and adjusting the mass concentration of the carboxymethyl cellulose to 1-20% to obtain green colloid solution I;
(2) Preparation of colloidal solution II: dissolving chitosan and lithium bromide in an acid solution, stirring for 10-48h at 300-1000rpm, and adjusting the mass concentration of the chitosan to 1-10% to obtain a chitosan colloid solution II;
(3) Adding the colloidal solution I into the colloidal solution II according to the mass ratio of the carboxymethyl cellulose to the chitosan of 0.2-4:l, continuously stirring at 500-1000rpm until the mixed solution is completely and uniformly stirred to form hydrogel, and then freeze-drying.
5. The use of a color response mechanism based biomass aerogel material in ammonia adsorption according to claim 4, wherein in step (1), the mass concentration of nickel chloride hexahydrate is 0.1-48%.
6. The application of the biomass aerogel material based on the color response mechanism in ammonia gas adsorption according to claim 4, wherein in the step (2), the acidic solution is a hydrochloric acid solution or an acetic acid solution with a mass concentration of 0.1-2%.
7. The use of a color response mechanism based biomass aerogel material in ammonia adsorption according to claim 4, wherein in step (3), the freeze drying is: freezing the obtained hydrogel at the temperature of minus 20 ℃ for 8-24 hours, and freeze-drying the reacted solid for 1-3d to obtain the biomass aerogel material.
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CN106040183A (en) * 2016-05-23 2016-10-26 常州大学 Preparation for carboxymethyl cellulose/chitosan composite xerogel and application of carboxymethyl cellulose/chitosan composite xerogel in adsorption of methyl orange in water
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Publication number Priority date Publication date Assignee Title
CN106040183A (en) * 2016-05-23 2016-10-26 常州大学 Preparation for carboxymethyl cellulose/chitosan composite xerogel and application of carboxymethyl cellulose/chitosan composite xerogel in adsorption of methyl orange in water
CN111821950A (en) * 2020-08-18 2020-10-27 湘潭大学 Preparation method of biochar ammonia adsorbent

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