CN108752606B - Cellulose composite hydrogel for dye adsorption and preparation method thereof, and aerogel and preparation method thereof - Google Patents

Cellulose composite hydrogel for dye adsorption and preparation method thereof, and aerogel and preparation method thereof Download PDF

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CN108752606B
CN108752606B CN201810669740.2A CN201810669740A CN108752606B CN 108752606 B CN108752606 B CN 108752606B CN 201810669740 A CN201810669740 A CN 201810669740A CN 108752606 B CN108752606 B CN 108752606B
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dye adsorption
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aerogel
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王勇
韦枭
杨静晖
祁晓东
黄婷
张楠
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Southwest Jiaotong University
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Abstract

The invention relates to the field of material preparation, in particular to cellulose composite hydrogel for dye adsorption and a preparation method thereof, and aerogel and a preparation method thereof. The method comprises the following steps: adding microcrystalline cellulose into a LiBr aqueous solution, stirring under the oil bath condition of 110-130 ℃ until the microcrystalline cellulose is completely dissolved, and cooling to obtain cellulose hydrogel; soaking the cellulose hydrogel in ferric chloride solution, and oscillating until the cellulose hydrogel is balanced in swelling to obtain first hydrogel; and (3) immersing the first hydrogel into pyrrole monomers, and oscillating to react until the first hydrogel and the pyrrole monomers are polymerized. The method is simple to operate and high in feasibility. The cellulose composite hydrogel prepared by the method can preserve the structure of polypyrrole to the maximum extent, and further embodies excellent dye adsorption performance.

Description

Cellulose composite hydrogel for dye adsorption and preparation method thereof, and aerogel and preparation method thereof
Technical Field
The invention relates to the field of material preparation, in particular to cellulose composite hydrogel for dye adsorption and a preparation method thereof, and aerogel and a preparation method thereof.
Background
The dye has the characteristics of complex components, high chromaticity, large COD/BOD concentration, large water quality/water quantity change, more difficultly-degraded substances and the like, and the characteristics of multiple varieties and quick update make the dye wastewater difficult to find a particularly effective purification method, so the treatment problem of the dye wastewater is always concerned since the last century.
The polypyrrole can be used for dye wastewater adsorption treatment due to unique high conductivity, semiconductor characteristics, relatively good environmental stability, reversible oxidation-reduction property and biological affinity.
However, at present, there are two main methods of producing polypyrrole films, i.e., chemical oxidation and electrochemical oxidation. Generally, the chemical oxidation method has simple preparation process and lower cost, and is also suitable for mass production, but the polypyrrole obtained by the method is generally a powder sample and has low processing formability; and the conductive polypyrrole film can be directly prepared by an electrochemical oxidation method. The polypyrrole film cannot be directly used for dye wastewater adsorption treatment.
Disclosure of Invention
The first purpose of the invention is to provide a preparation method of cellulose composite hydrogel for dye adsorption, which is simple to operate and has strong feasibility.
A second object of the present invention is to provide a cellulose composite hydrogel for dye adsorption, which has excellent dye adsorption properties.
The third purpose of the invention is to provide a preparation method of the cellulose composite aerogel for dye adsorption, which has strong operability.
A fourth object of the present invention is to provide a cellulose composite aerogel for dye adsorption, which has excellent dye adsorption performance.
In order to achieve the above purpose, the embodiment of the present invention adopts the following technical solutions:
a method for preparing cellulose composite hydrogel for dye adsorption comprises the following steps: adding microcrystalline cellulose into a LiBr aqueous solution, stirring under the oil bath condition of 110-130 ℃ until the microcrystalline cellulose is completely dissolved, and cooling to obtain cellulose hydrogel;
soaking the cellulose hydrogel in ferric chloride solution, and oscillating until the cellulose hydrogel is balanced in swelling to obtain first hydrogel; and (3) immersing the first hydrogel into pyrrole monomers, and oscillating to react until the first hydrogel and the pyrrole monomers are polymerized.
The cellulose composite hydrogel for dye adsorption is prepared by the preparation method of the cellulose composite gel for dye adsorption.
The preparation method of the cellulose composite aerogel for dye adsorption is characterized in that the cellulose composite aerogel for dye adsorption is prepared by freeze drying at the temperature of between 50 ℃ below zero and 55 ℃ below zero and at the temperature of between 12 and 18 pa.
The cellulose composite aerogel for dye adsorption is prepared by the preparation method of the cellulose composite aerogel for dye adsorption.
The invention has the beneficial effects that:
the invention provides a preparation method of cellulose composite hydrogel for dye adsorption, which comprises the following steps: adding microcrystalline cellulose into a LiBr aqueous solution, stirring under the oil bath condition of 110-130 ℃ until the microcrystalline cellulose is completely dissolved, and cooling to obtain cellulose hydrogel; soaking the cellulose hydrogel in ferric chloride solution, and oscillating until the cellulose hydrogel is balanced in swelling to obtain first hydrogel; and (3) immersing the first hydrogel into pyrrole monomers, and oscillating to react until the first hydrogel and the pyrrole monomers are polymerized. The method is simple to operate and high in feasibility. The cellulose composite hydrogel prepared by the method can preserve the structure of polypyrrole to the maximum extent, and further embodies excellent dye adsorption performance.
The cellulose composite hydrogel for dye adsorption is prepared by the preparation method of the cellulose composite gel for dye adsorption. The cellulose composite hydrogel has excellent dye adsorption performance.
The invention provides a preparation method of cellulose composite aerogel for dye adsorption, which comprises the step of carrying out freeze drying on the cellulose composite aerogel for dye adsorption at the temperature of between 50 ℃ below zero and 55 ℃ below zero and at the temperature of between 12 and 18pa to obtain the cellulose composite aerogel. The method is strong in operability, and the prepared dye has excellent dye adsorption performance.
The cellulose composite aerogel for dye adsorption provided by the invention is prepared by the preparation method of the cellulose composite aerogel for dye adsorption. The cellulose composite aerogel is loose and porous, has a large specific surface area and has excellent dye adsorption performance.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a 10000 times SEM magnified image of pure microcrystalline cellulose aerogel;
FIG. 2 is an SEM magnified image of 10000 times of the cellulose composite aerogel sample prepared in the example 2;
FIG. 3 is an SEM magnified image of 10000 times of the cellulose composite aerogel sample prepared in the example 3;
FIG. 4 is an SEM magnified image of 10000 times of the sample of the cellulose composite aerogel prepared in the example 5;
FIG. 5 shows ATR-FTIR spectra of cellulose composite aerogels for dye adsorption prepared in examples 1-5 and pure microcrystalline cellulose aerogels provided in comparative examples.
Detailed Description
Embodiments of the present invention will be described in detail below with reference to examples, but it will be understood by those skilled in the art that the following examples are only illustrative of the present invention and should not be construed as limiting the scope of the present invention. The examples, in which specific conditions are not specified, were conducted under conventional conditions or conditions recommended by the manufacturer. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
In the description of the present invention, it should be noted that the terms "first", "second", and the like are used only for distinguishing the description, and are not intended to indicate or imply relative importance.
The cellulose composite hydrogel for dye adsorption and the preparation method thereof, and the aerogel and the preparation method thereof according to the embodiment of the present invention are specifically described below.
The embodiment of the invention provides a preparation method of cellulose composite hydrogel for dye adsorption, which comprises the following steps:
s1, preparing the cellulose hydrogel.
Specifically, microcrystalline cellulose (MCC) is added into a LiBr aqueous solution, and the mixture is stirred under the oil bath condition of 110-130 ℃ until the microcrystalline cellulose is completely dissolved, and then cooled to prepare the cellulose hydrogel.
LiBr is a white cubic crystal system crystal or granular powder, is very soluble in water, ethanol and ether, is slightly soluble in pyridine, and is soluble in organic solvents such as methanol, acetone, ethylene glycol and the like. Has high-efficiency water vapor absorbent and air humidity regulator.
In other alternative embodiments of the present invention, other reagents that are commonly used in the art to perform similar functions may be selected from the LiBr aqueous solution.
Further, in the present embodiment, the mass ratio of microcrystalline cellulose (MCC) to LiBr is 1: 100.
further, the LiBr aqueous solution is prepared by stirring under the condition of 75-85 ℃ water bath.
In the preparation of the above-mentioned aqueous solution of LiBr, it is selected to completely dissolve LiBr in water.
Alternatively, when 7.5g of LiBr is selected as the above, 5mL of deionized water is selected, so that LiBr can be completely dissolved in deionized water.
Specifically, 7.5g of LiBr was dissolved in 5mL of deionized water under stirring in a water bath at 80 ℃ and after complete dissolution, 75mg of microcrystalline cellulose MCC was added.
Further, after adding the microcrystalline cellulose MCC into the LiBr aqueous solution, stirring for 20-60 minutes under the oil bath condition of 110-130 ℃ until the microcrystalline cellulose is completely dissolved, and then cooling in a normal-temperature water bath to obtain the solid cellulose hydrogel.
S2, soaking the cellulose hydrogel in ferric chloride solution, and oscillating until the cellulose hydrogel swells and is balanced to obtain the first hydrogel.
Further, before the cellulose hydrogel is soaked in the ferric chloride solution, the cellulose hydrogel is washed until no LiBr exists in the cellulose hydrogel.
Specifically, the prepared cellulose hydrogel is soaked in deionized water, and the deionized water is continuously replaced until LiBr in the hydrogel is completely removed.
By removing LiBr in the hydrogel, the possibility of impurities in the composite hydrogel obtained by subsequent preparation is effectively avoided, and the favorable guarantee is provided for the subsequent improvement of the adsorption property of the polypyrrole-microcrystalline cellulose composite hydrogel.
Further, the concentration of the ferric chloride solution is 0.05-0.2 mol/L.
Further, the step of soaking the cellulose hydrogel in the ferric chloride solution is to shake the cellulose hydrogel in a water bath at constant temperature for 45 to 50 hours at normal temperature.
Optionally, 0.1mol/L FeCl is configured3And (3) soaking pure cellulose hydrogel cleaned with LiBr in the solution, and oscillating the solution in a water bath constant-temperature oscillator for 48 hours at normal temperature to achieve swelling balance.
S3, immersing the first hydrogel into pyrrole monomers, and oscillating to react until the first hydrogel and the pyrrole monomers are polymerized.
Further, before the first hydrogel is immersed in the pyrrole monomer, the first hydrogel is washed until the surface of the first hydrogel is free of FeCl3。
Further, the first hydrogel is immersed in pyrrole monomer, and the shaking reaction is carried out under the constant temperature condition of a water bath of 20-30 ℃.
Further, the oscillation speed is 140-.
Optionally rinsing excess FeCl on the surface of the hydrogel3Then immersing the composite hydrogel into pyrrole monomers, oscillating the composite hydrogel in a water bath constant temperature oscillator at normal temperature for reaction, wherein the oscillation speed is 150r/min, and the oscillation time is 0.5-6 hours respectively, and washing unpolymerized pyrrole on the surface of the composite hydrogel to prepare the PPy/MCC composite hydrogel.
Some embodiments of the present invention also provide a cellulose composite hydrogel for dye adsorption, which is prepared using the method for preparing a cellulose composite gel for dye adsorption as described above.
Some embodiments of the present invention also provide a method for preparing a cellulose composite aerogel for dye adsorption, comprising: the prepared cellulose composite gel for dye adsorption is frozen and dried under the conditions of-50 to-55 ℃ and 12-18pa to prepare the dye-adsorbed cellulose composite gel.
Some embodiments of the present invention also provide a cellulose composite aerogel for dye adsorption, which is prepared by the above method for preparing the cellulose composite aerogel for dye adsorption.
The features and properties of the present invention are further described in detail below with reference to examples:
example 1
The cellulose composite aerogel for dye adsorption provided by the embodiment is prepared by the following steps:
dissolving 7.5g of LiBr in 5mL of deionized water at 80 ℃ under the condition of water bath stirring, adding 75mg of microcrystalline cellulose MCC after complete dissolution, and stirring for 30 minutes at 120 ℃ under the condition of oil bath till the cellulose is completely dissolved. Then cooling in a normal temperature water bath to obtain the solid hydrogel. And soaking the prepared cellulose hydrogel in deionized water, and continuously replacing the deionized water until LiBr in the hydrogel is completely removed.
FeCl of 0.1mol/L is prepared3And (3) soaking pure cellulose hydrogel cleaned with LiBr in the solution, and oscillating the solution in a water bath constant-temperature oscillator for 48 hours at normal temperature to achieve swelling balance. Rinsing excess FeCl on the hydrogel surface3Then, the composite hydrogel is immersed in pyrrole monomer, and is subjected to oscillation reaction in a water bath constant temperature oscillator at the normal temperature, the oscillation speed is 150r/min, the oscillation time is 0.5 hour respectively, and unpolymerized pyrrole on the surface of the composite hydrogel is cleaned, so that the PPy/MCC composite hydrogel is prepared. And finally, freeze-drying at-53 ℃ under the condition of 15pa to obtain the PPy/MCC composite aerogel.
Example 2
The cellulose composite aerogel for dye adsorption provided by the embodiment is prepared by the following steps:
dissolving 7.5g of LiBr in 5mL of deionized water at 75 ℃ under the condition of water bath stirring, adding 75mg of microcrystalline cellulose MCC after complete dissolution, and stirring for 20 minutes at 110 ℃ under the condition of oil bath till the cellulose is completely dissolved. Then cooling in a normal temperature water bath to obtain the solid hydrogel. And soaking the prepared cellulose hydrogel in deionized water, and continuously replacing the deionized water until LiBr in the hydrogel is completely removed.
FeCl of 0.05mol/L is prepared3And (3) soaking pure cellulose hydrogel cleaned with LiBr in the solution, and oscillating the solution in a water bath constant-temperature oscillator for 45 hours at normal temperature to achieve swelling balance. Rinsing excess FeCl on the hydrogel surface3Then, the composite hydrogel is immersed in pyrrole monomer, and is subjected to oscillation reaction in a water bath constant temperature oscillator at the normal temperature, the oscillation speed is 140r/min, the oscillation time is 1 hour respectively, and unpolymerized pyrrole on the surface of the composite hydrogel is cleaned, so that the PPy/MCC composite hydrogel is prepared. And finally, freeze-drying at-50 ℃ under the condition of 12pa to obtain the PPy/MCC composite aerogel.
Example 3
The cellulose composite aerogel for dye adsorption provided by the embodiment is prepared by the following steps:
dissolving 7.5g of LiBr in 5mL of deionized water at 75 ℃ under the condition of water bath stirring, adding 75mg of microcrystalline cellulose MCC after complete dissolution, and stirring for 60 minutes at 130 ℃ under the condition of oil bath till the cellulose is completely dissolved. Then cooling in a normal temperature water bath to obtain the solid hydrogel. And soaking the prepared cellulose hydrogel in deionized water, and continuously replacing the deionized water until LiBr in the hydrogel is completely removed.
FeCl of 0.2mol/L is prepared3And (3) soaking pure cellulose hydrogel cleaned with LiBr in the solution, and oscillating the solution in a water bath constant-temperature oscillator for 50 hours at normal temperature to achieve swelling balance. Rinsing excess FeCl on the hydrogel surface3Then immersing the composite hydrogel into pyrrole monomers, oscillating the monomers in a water bath constant temperature oscillator at normal temperature for reaction at the oscillation speed of 160r/min for 2 hours respectively, and washing unpolymerized pyrrole on the surface of the composite hydrogel to obtain the PPy/MCC composite hydrogelAnd (6) gluing. And finally, freeze-drying at-55 ℃ under the condition of 18pa to obtain the PPy/MCC composite aerogel.
Example 4
The cellulose composite aerogel for dye adsorption provided by the embodiment is prepared by the following steps:
dissolving 7.5g of LiBr in 5mL of deionized water at 75 ℃ under the condition of water bath stirring, adding 75mg of microcrystalline cellulose MCC after complete dissolution, and stirring for 40 minutes at 125 ℃ under the condition of oil bath till the cellulose is completely dissolved. Then cooling in a normal temperature water bath to obtain the solid hydrogel. And soaking the prepared cellulose hydrogel in deionized water, and continuously replacing the deionized water until LiBr in the hydrogel is completely removed.
FeCl of 0.15mol/L is prepared3And (3) soaking pure cellulose hydrogel cleaned with LiBr in the solution, and oscillating the solution in a water bath constant-temperature oscillator for 40 hours at normal temperature to achieve swelling balance. Rinsing excess FeCl on the hydrogel surface3Then, the composite hydrogel is immersed in pyrrole monomer, oscillation reaction is carried out in a water bath constant temperature oscillator at the normal temperature, the oscillation speed is 155r/min, the oscillation time is 4 hours respectively, and unpolymerized pyrrole on the surface of the composite hydrogel is cleaned, so that the PPy/MCC composite hydrogel is prepared. And finally, freeze-drying at-51 ℃ under the condition of 16pa to obtain the PPy/MCC composite aerogel.
Example 5
The cellulose composite aerogel for dye adsorption provided by the embodiment is prepared by the following steps:
dissolving 7.5g of LiBr in 5mL of deionized water under the condition of stirring in a water bath at 75 ℃, adding 75mg of microcrystalline cellulose MCC after complete dissolution, and stirring for 45 minutes under the condition of oil bath at 115 ℃ until the cellulose is completely dissolved. Then cooling in a normal temperature water bath to obtain the solid hydrogel. And soaking the prepared cellulose hydrogel in deionized water, and continuously replacing the deionized water until LiBr in the hydrogel is completely removed.
FeCl of 0.12mol/L is prepared3And (3) soaking pure cellulose hydrogel cleaned with LiBr in the solution, and oscillating the solution in a water bath constant-temperature oscillator for 45 hours at normal temperature to achieve swelling balance. Rinsing excess FeCl on the hydrogel surface3Then immersing itAdding into pyrrole monomer, oscillating in a water bath constant temperature oscillator at normal temperature for reaction at the oscillation speed of 152r/min for 6 hours respectively, and washing unpolymerized pyrrole on the surface of the composite hydrogel to obtain the PPy/MCC composite hydrogel. And finally, freeze-drying at-52 ℃ under the condition of 17pa to obtain the PPy/MCC composite aerogel.
Comparative example
Pure microcrystalline cellulose aerogels
Experimental example:
1. the morphology of the cellulose composite aerogel for dye adsorption prepared in examples 2, 3 and 5 and the morphology of the pure microcrystalline cellulose aerogel provided in the comparative example were analyzed by scanning electron microscopy, and the results are shown in fig. 1 to 4.
It can be seen from fig. 1-4 that: before and after compounding, the change of the network structure of the matrix cellulose is small, but after compounding, particularly the gray level of the image of the composite aerogel with the polymerization time of 2h and 6h is obviously improved, which indicates that the deposit on the surface of the substance is changed, namely the black polypyrrole is deposited on the surface of the cellulose. And the gray scale of the image is more uniform and can be judged: although there is little agglomeration, the polypyrrole is distributed more uniformly over the surface of the cellulose. As can be seen from FIGS. 3 and 4, PPy obtained by in situ oxidative polymerization is spherical particles with a smooth surface, the average particle size is 0.1 μm, except a small amount of PPy distributed in a cluster form on a cellulose network, polypyrrole is mainly attached to a cellulose skeleton as microparticles, and the particle size ranges from 0.1 μm to 2 μm. Thus, the cellulose composite aerogels for dye adsorption prepared in examples 1 to 5 have excellent adsorption performance.
2. The cellulose composite aerogel for dye adsorption prepared in examples 1 to 5 and the pure microcrystalline cellulose aerogel provided in the comparative example were subjected to infrared spectroscopy for analyzing the structures thereof. The results of ATR-FTIR spectra are shown in FIG. 5.
Curve a is ATR-FTIR spectrum of pure cellulose aerogel, and characteristic peaks are respectively located at 3355cm-1、2888cm-1And 1059cm-1The stretching vibration of the hydroxyl group O-H, the stretching vibration of the C-H and the stretching vibration of the ether bond C-O-C are respectively corresponded; 1059cm-1Two sides of the main peak are provided with a plurality of weak acromions (1157 cm)-1And 898cm-1) It represents the stretching vibration of the ether bond C-O-C and the hydroxyl group C-O-H in the cellulose molecule. 1358cm-1、1314cm-1Belongs to alkyl C-H bending vibration. 666cm-1Is the out-of-plane bending vibration peak of hydroxyl O-H.
Curves b-f represent FT-IR spectra of PPy/MCC composite aerogel prepared at polymerization time of 0.5, 1, 2, 4 and 6 hours, respectively, except 3355cm-1、2888cm-1And 1059cm-1The peaks other than the characteristic peaks of cellulose, which are contained in the PPy ring, are observed at 3367cm, respectively, for N-H (coupled with O-H stretching peak), C ═ C, and ═ C-N (coupled with C-C stretching peak) stretching vibration peaks-1，1551cm-1And 1450cm-1To (3). 1358cm-1、1314cm-1The peak became strong because the aromatic hydrogen ═ C-H bending vibration was coupled with the alkyl C-H bending vibration, and it was located at 1196cm-1,898cm-1Respectively, the protonation process induced in-plane bending vibration of-C-H and out-of-plane bending vibration peak of-C-H. 968cm-1The characteristic peak of the out-of-plane bending vibration of the N-H plane is a hydrogen bonding.
The composite material maintains the characteristic absorption peak of polypyrrole, which indicates that the basic structure of polypyrrole is not damaged by the composition with microcrystalline cellulose, thereby proving that the cellulose composite aerogel for dye adsorption prepared in examples 1 to 5 has excellent adsorption performance.
3. The cellulose composite aerogels for dye adsorption prepared in examples 1 to 5 and the pure microcrystalline cellulose aerogels provided in the comparative examples were examined for their adsorption performance to a single dye.
Firstly, preparing dye aqueous solution respectively: congo red, methyl orange, acid chrome blue K, aqueous eosin Y and methylene blue solutions at concentrations of 300mg/L, 50mg/L and 50mg/L, respectively.
Then weighing 5 parts of the cellulose composite aerogel for dye adsorption prepared in the embodiments 1-5, wherein each part is 20mg, respectively adding the weighed 5 parts into 50mL of 5 kinds of coloring agent solutions, oscillating the mixture in a water bath constant temperature oscillator at normal temperature for 48 hours, taking deionized water as a standard sample, obtaining absorbance through an ultraviolet-visible spectrophotometer test, calculating adsorption rate R according to the absorbance, comparing adsorption capacities of the composite gels at different polymerization times to different coloring agents, and plotting differences of the PPy/MCC composite aerogel prepared in different dye solutions at different polymerization times to five dye adsorption rates. The results are shown in the following table:
Figure GDA0002541416930000141
as can be seen from the above table, the composite aerogels provided in embodiments 1 to 5 all exhibit good adsorption effects on the adsorption performance of five dyes. Under the oscillation condition, the PPy/MCC aerogel can effectively contact dye molecules due to the fiber form and the higher specific surface area, and the electrostatic attraction characteristic of the polypyrrole molecular nitrogen positive ions enables the composite material to have an excellent adsorption effect on anionic dyes, particularly anionic dye CR, and the CR removal rate is up to 84.18%.
4. The selective adsorption performance of the cellulose composite aerogel for dye adsorption prepared in examples 1 to 5 and the pure microcrystalline cellulose aerogel provided in the comparative example was examined.
Methylene blue/eosin Y (MB/ESY is 1:1) and methylene blue/acid chrome blue (MB/ACBK is 1:1) mixed dye aqueous solutions are respectively prepared, 1 part of 20mg of the PPy/MCC composite aerogel prepared in the example 3 is added, the mixture is subjected to constant-temperature oscillation and adsorption for 48 hours at normal temperature, the reduction ratio of the peak value of the corresponding absorption wavelength is calculated after an ultraviolet-visible spectrophotometer test, and the adsorption rate R and the adsorption quantity q of the composite aerogel to each dye component are plotted. The results are given in the following table:
Figure GDA0002541416930000151
when adsorbing single dyestuff, compound aerogel is about 2 times of ESY and MO to the MB adsorption efficiency, and after the dyestuff equivalent is mixed, compound aerogel becomes similar to the adsorption efficiency and the adsorption capacity of each component dyestuff on the contrary, has appeared adsorbing the condition that is superior to MB to ESY in addition, and the demonstration example compound aerogel made is not selected the adsorptivity or is selected the adsorptivity not strong to the used dyestuff of experiment.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (8)

1. A method for preparing cellulose composite gel for dye adsorption is characterized by comprising the following steps:
adding microcrystalline cellulose into a LiBr aqueous solution, stirring under the oil bath condition of 110-130 ℃ until the microcrystalline cellulose is completely dissolved, and cooling to obtain cellulose hydrogel; soaking the cellulose hydrogel in deionized water, and continuously replacing the deionized water until LiBr in the hydrogel is completely removed;
soaking the cellulose hydrogel in ferric chloride solution, and oscillating until swelling is balanced to obtain a first hydrogel;
immersing the first hydrogel into pyrrole monomers, and carrying out oscillation reaction until the first hydrogel and the pyrrole monomers are polymerized; oscillating the reaction time to be 0.5 to 6 hours; before the first hydrogel is immersed in the pyrrole monomer, the first hydrogel is washed until the surface of the first hydrogel is free of FeCl3。
2. The method for preparing a cellulose composite gel for dye adsorption according to claim 1,
the concentration of the ferric chloride solution is 0.05-0.2 mol/L.
3. The method for producing a cellulose composite gel for dye adsorption according to any one of claims 1 to 2,
the cellulose hydrogel is soaked in the ferric chloride solution and shaken in a water bath at the temperature of 20-30 ℃ for 45-50 hours.
4. The method for preparing a cellulose composite gel for dye adsorption according to claim 1,
and (3) immersing the first hydrogel into the pyrrole monomer, wherein the oscillation reaction is carried out under the conditions of water bath at normal temperature and constant temperature.
5. The method for preparing a cellulose composite gel for dye adsorption according to claim 1,
the mass ratio of the microcrystalline cellulose to the LiBr is 1: 100.
6. a cellulose composite gel for dye adsorption comprising:
the cellulose composite gel for dye adsorption is prepared by the method for preparing the cellulose composite gel for dye adsorption according to any one of claims 1 to 5.
7. A preparation method of cellulose composite aerogel for dye adsorption is characterized in that,
the cellulose composite gel for dye adsorption according to claim 6 is prepared by freeze drying at-50 to-55 ℃ and 12-18 pa.
8. A cellulose composite aerogel used for dye adsorption is characterized in that,
the cellulose composite aerogel for dye adsorption according to claim 7.
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