CN112175152A - Hydrogel and preparation method and application thereof - Google Patents

Hydrogel and preparation method and application thereof Download PDF

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CN112175152A
CN112175152A CN202010989881.XA CN202010989881A CN112175152A CN 112175152 A CN112175152 A CN 112175152A CN 202010989881 A CN202010989881 A CN 202010989881A CN 112175152 A CN112175152 A CN 112175152A
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韦树霞
陈武
童志明
江南
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Yangtze University
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    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/22—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising organic material
    • B01J20/26—Synthetic macromolecular compounds
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    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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    • C02F1/28—Treatment of water, waste water, or sewage by sorption
    • C02F1/285—Treatment of water, waste water, or sewage by sorption using synthetic organic sorbents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/20—Heavy metals or heavy metal compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/30—Organic compounds
    • C02F2101/308—Dyes; Colorants; Fluorescent agents

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Abstract

The invention relates to a hydrogel and a preparation method and application thereof. The hydrogel is prepared by mixing sodium lignosulfonate, an acrylamide monomer and a crosslinking agent, dissolving in water to obtain a first mixture, adding peroxide into the first mixture to obtain a second mixture, and adding a reducing agent and a cationic monomer into the second mixture to mix. The invention also provides a preparation method of the hydrogel, which comprises the following steps: s1, mixing sodium lignosulfonate, an acrylamide monomer and a cross-linking agent, and dissolving in water to obtain a first mixture; s2, adding peroxide into the first mixture, and mixing and reacting to obtain a second mixture; and S3, adding a reducing agent and a cationic monomer into the second mixture, and mixing to obtain the hydrogel. The invention also comprises the application of the hydrogel or the hydrogel prepared by the preparation method in dye and/or heavy metal ion wastewater treatment. The hydrogel has large water absorption capacity and strong adsorption capacity to dye and heavy metal ions.

Description

Hydrogel and preparation method and application thereof
Technical Field
The invention relates to the field of functional materials, in particular to hydrogel and a preparation method and application thereof.
Background
With the rapid development of industry, a large amount of heavy metal ions and organic dye wastewater is generated and seriously pollutes water and land which people rely on to live, thereby bringing great harm to human beings and biospheres. At present, heavy metal ions and organic dye wastewater are mainly treated by a chemical method and a physical chemical method, wherein an adsorption method in the physical chemical method is relatively wide. Most of the adsorbents have high cost and complex treatment process, and some adsorbents can bring secondary pollution. Therefore, the preparation of the biomass adsorption material which is high in quality, low in cost and environment-friendly is significant.
Lignin belongs to an aromatic high polymer, which is second only to cellulose in number, and is the second largest natural organic matter. The lignin is a renewable resource which is rich in source, low in price and non-toxic, and the industrial lignin is mainly derived from the wastewater of the pulping and papermaking industry, is recovered and modified, so that the problem of environmental pollution caused by the papermaking wastewater can be effectively solved, and obvious social and economic benefits can be brought. In order to make full use of lignin, scholars at home and abroad carry out a great deal of research work on lignin, the lignin modification means is greatly developed, and the application of lignin in hydrogel is concerned by researchers.
Hydrogels are three-dimensional network polymers that swell but do not dissolve in water, containing large amounts of moisture. A large number of functional groups exist in hydrogel, so that metal ions and dye ions can be easily adsorbed, meanwhile, the hydrogel has a good network structure, so that the hydrogel can swell in water but is insoluble in water, and the adsorbed hydrogel is easily separated from a liquid phase, so that the subsequent separation work can be reduced, and therefore, the hydrogel attracts attention in the dye adsorption aspect as a novel adsorbent. The strength of the hydrogel can be improved by introducing lignin into the hydrogel. The lignin has certain biocompatibility, so the addition of the lignin does not influence the biocompatibility of the hydrogel. Because the lignin contains phenolic hydroxyl, carboxyl and other groups, the adsorption of the gel on dye and metal ions is facilitated, so that the novel lignin-based hydrogel adsorbent prepared by taking the lignin as a raw material has great practical significance in the fields of treatment of heavy metal wastewater, dye wastewater and the like.
However, in the existing reports, the lignin-based hydrogel has the problems of complex synthesis process, weak water absorption swelling capacity, low adsorption capacity and the like. The synthesis process is complex, and the added chemical agents are various in types, influence factors are various, and the reaction is difficult to control. In addition, the maximum water absorption swelling capacity of the hydrogel is 30.2g/g, and the water absorption capacity is general; plum blossom (preparation of plum blossom. cationic lignin-based hydrogel and application thereof in wastewater treatment. Qilu university of industry. 2016) synthesizes cationic lignin-based gel (Lig-g-P (AM-co-DAC)) by using organic lignin as raw material, and treating Cr at pH of 16+The adsorption amount of (A) is less than 8 mg/g.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: how to obtain hydrogel with large water absorption capacity and strong adsorption capacity to dye and heavy metal ions.
In order to solve the technical problems, the invention provides a hydrogel and a preparation method and application thereof.
The invention provides a hydrogel which is prepared by mixing sodium lignosulfonate, an acrylamide monomer and a cross-linking agent, dissolving in water to obtain a first mixture, adding peroxide into the first mixture to obtain a second mixture, and adding a reducing agent and a cationic monomer into the second mixture to mix.
Further, the mass ratio of the sodium lignin sulfonate to the acrylamide monomer is 1 (3-8).
Further, the mass usage of the cross-linking agent accounts for 1.5-10.5% of the mass usage of the acrylamide monomer.
Furthermore, the mass usage of the peroxide accounts for 6.25-20.625% of the mass usage of the acrylamide monomer.
Further, the cross-linking agent is N, N' -methylene bisacrylamide; and/or the peroxide is one or more of hydrogen peroxide, ammonium persulfate, potassium persulfate and benzoyl peroxide; and/or the reducing agent is tetramethyl ethylene diamine and/or oxalic acid; and/or the cationic monomer is acryloyloxyethyl trimethyl ammonium chloride.
Further, the mass ratio of the cationic monomer to the acrylamide monomer is 1: 6-4: 1.
The invention also provides a preparation method of the hydrogel, which comprises the following steps:
s1, mixing sodium lignosulfonate, an acrylamide monomer and a cross-linking agent, and dissolving in water to obtain a first mixture;
s2, adding peroxide into the first mixture, and mixing and reacting to obtain a second mixture;
and S3, adding a reducing agent and a cationic monomer into the second mixture, and mixing to obtain the hydrogel.
Further, in step S3, the reducing agent and the cationic monomer are added to the second mixture and mixed at 25 to 80 ℃ to obtain the hydrogel.
Further, in step S1, the sodium lignosulfonate, the acrylamide monomer, and the crosslinking agent are mixed and dissolved in water, and then preheated at 25 to 80 ℃ for 10 to 50min to obtain the first mixture.
The invention also provides application of the hydrogel or the hydrogel prepared by the preparation method in dye and/or heavy metal ion wastewater treatment.
Compared with the prior art, the invention has the advantages that: according to the hydrogel provided by the invention, the initial free radical R & is firstly generated by peroxide to react with the acrylamide monomer to generate the acrylamide free radical monomer; the acrylamide free radical monomer is further grafted with sodium Lignosulfonate (LS) and a cationic monomer (DAC) to carry out chain growth reaction to generate a long-chain polymer; under the action of a cross-linking agent, polymers are polymerized into a terpolymer through the cross-linking action, namely the modified sodium lignosulfonate hydrogel is obtained, and sodium Lignosulfonate (LS) and a cationic monomer are combined together to synthesize the hydrogel; the sodium Lignosulfonate (LS) is combined with the cationic monomer, so that not only are active adsorption sites increased, but also the anion adsorption capacity is obviously increased, and the hydrogel has high water absorption capacity and strong adsorption capacity on dyes and heavy metal ions. The water absorption amount of the hydrogel is up to more than 70 g/g; for Cr6+The adsorption amount of the acid red 73 reaches 20mg/g, and the adsorption amount of the acid red 73 reaches 45 mg/g.
Drawings
The features and advantages of the present invention will be more clearly understood by reference to the accompanying drawings, which are illustrative and not to be construed as limiting the invention in any way, and in which:
figure 1 is a synthesis scheme for hydrogels.
FIG. 2 is a schematic diagram of the synthesis of a hydrogel.
FIG. 3 is an infrared spectrum of the hydrogel obtained in example 1.
FIG. 4 is a graph showing the water absorption swelling of the modified hydrogel obtained in example 4.
FIG. 5 shows the hydrogel prepared in example 5 for acid Red 73(AR 73) and Cr6+And (5) an adsorption effect graph.
Detailed Description
The specific embodiment provides a hydrogel, which is prepared by mixing sodium lignosulfonate, an acrylamide monomer and a cross-linking agent, dissolving in water to obtain a first mixture, adding peroxide into the first mixture to obtain a second mixture, adding a reducing agent and a cationic monomer into the second mixture, and mixing; the mass ratio of the sodium lignosulfonate to the acrylamide monomer is 1 (3-8); the mass usage of the cross-linking agent accounts for 1.5-10.5% of the mass usage of the acrylamide monomer; the mass usage of the peroxide accounts for 6.25-20.625% of the mass usage of the acrylamide monomer; the cross-linking agent is N, N' -Methylene Bisacrylamide (MBA); the peroxide is one or more of hydrogen peroxide, ammonium persulfate, potassium persulfate and benzoyl peroxide; the reducing agent is tetramethylethylenediamine and/or oxalic acid; the cationic monomer is acryloyloxyethyl trimethyl ammonium chloride (DAC); the mass ratio of the cationic monomer to the acrylamide monomer is 1: 6-4: 1.
With reference to fig. 1, the present embodiment further includes a method for preparing the hydrogel, including the following steps:
s1, mixing and dissolving sodium lignosulfonate, an acrylamide monomer and a cross-linking agent in water, and then preheating for 10-50min at 25-80 ℃ to obtain a first mixture;
s2, adding peroxide into the first mixture, and mixing and reacting to obtain a second mixture;
s3, adding a reducing agent and a cationic monomer into the second mixture, and mixing at 25-80 ℃ to obtain the hydrogel;
s4, cutting the hydrogel into small blocks, soaking the small blocks in a large amount of distilled water for 3-4 days, and changing the water 2-4 times per day to remove unreacted monomers in the gel. And dehydrating the soaked gel at room temperature for two days, and drying in an oven at 55-80 ℃ to constant weight to obtain a dry gel sample for later use.
The specific embodiment also comprises the application of the hydrogel or the hydrogel prepared by the preparation method in dye and/or heavy metal ion wastewater treatment, and particularly relates to the application of the hydrogel as a novel adsorption material for dye and/or heavy metal ion wastewater treatment.
The following detailed description of the preferred embodiment of the present invention, taken in conjunction with the accompanying drawings, is provided to illustrate, by way of example, the principles of the invention and not to limit the scope of the invention.
Example 1
A method of making a hydrogel comprising the steps of:
(1) weighing 0.4g of sodium Lignosulfonate (LS), 1.6g of acrylamide monomer and 0.036g of cross-linking agent (MBA), putting into a beaker, adding a small amount of distilled water, and magnetically stirring for dissolving;
wherein the acrylamide monomer is polyacrylamide.
(2) Weighing 0.16g of initiator peroxide, putting the initiator peroxide into another beaker, and adding a small amount of distilled water to prepare a solution;
wherein the initiator peroxide is hydrogen peroxide.
(3) And (3) sealing the beakers in the steps (1) and (2), preheating the beakers in a constant-temperature water bath kettle at 40 ℃ for 10min, mixing the solutions of the two beakers, shaking up, adding 100 mu l of reducing agent Tetramethylethylenediamine (TEMED) and 1.0g of DAC cationic monomer into the reaction system, quickly shaking up, and placing the mixture in the constant-temperature water bath kettle at 40 ℃ for polymerization reaction to obtain the modified sodium lignosulfonate hydrogel.
(4) The gel was cut into small pieces and soaked in a large amount of distilled water for 3 days with 2 water changes per day to remove unreacted monomers from the gel. And dehydrating the soaked gel at room temperature for two days, and drying in an oven at 60 ℃ to constant weight to obtain a xerogel sample. FIG. 2 is an infrared spectrum of a modified sodium lignosulfonate hydrogel. As can be seen from FIG. 2, the infrared spectrum of the modified sodium lignosulfonate hydrogel is 952cm, compared with the infrared spectrum of sodium Lignosulfonate (LS)-1In which quaternary ammonium group-CH appears2-N+(CH3)3Characteristic absorption peak of (1), at 1106cm-1is-COOCH2An asymmetric stretching vibration absorption peak of medium-C-O-C at 1654cm-1is-CONH2The absorption peak of carbonyl of (a) is 1660--1The C ═ C peak disappeared, indicating that polymerization occurred with double bond cleavage. Thus, it was shown that sodium Lignosulfonate (LS) is reacted with acrylamide-based monomers and cationic monomers (DAC)The grafting reaction takes place and a terpolymer is obtained.
Example 2
A method of making a hydrogel comprising the steps of:
(1) weighing 0.4g of sodium Lignosulfonate (LS), 1.4g of acrylamide monomer and 0.030g of cross-linking agent (MBA), putting into a beaker, adding a small amount of distilled water, and magnetically stirring for dissolving;
wherein the acrylamide monomer is acrylamide.
(2) Weighing 0.16g of initiator peroxide, putting the initiator peroxide into another beaker, and adding a small amount of distilled water to prepare a solution;
wherein the initiator peroxide is Ammonium Persulfate (APS).
(3) Sealing the beakers of (1) and (2), preheating in a 80 ℃ constant-temperature water bath kettle for 30min, mixing the solutions of the two beakers, shaking up, adding a certain amount of 80 mu l of reducing agent and 1.40g of cationic monomer (DAC) into the reaction system, quickly shaking up, and carrying out polymerization reaction in the 80 ℃ constant-temperature water bath kettle to obtain modified sodium lignosulfonate hydrogel;
wherein the reducing agent is oxalic acid.
(4) The gel was cut into small pieces and soaked in a large amount of distilled water for 3 days with 3 water changes per day to remove unreacted monomers from the gel. And dehydrating the soaked gel at room temperature for two days, and drying in an oven at 55 ℃ to constant weight to obtain a xerogel sample.
Example 3
A method of making a hydrogel comprising the steps of:
(1) weighing 0.4g of sodium Lignosulfonate (LS), 1.8g of acrylamide monomer and 0.048g of cross-linking agent (MBA), putting into a beaker, adding a small amount of distilled water, and magnetically stirring for dissolving;
wherein the acrylamide monomer is N, N' -dimethylacrylamide.
(2) Weighing 0.19g of initiator peroxide, putting the initiator peroxide into another beaker, and adding a small amount of distilled water to prepare a solution;
wherein the initiator peroxide is potassium persulfate (KPS).
(3) And (3) sealing the beakers in the steps (1) and (2), preheating the beakers in a constant-temperature water bath kettle at the temperature of 30 ℃ for 50min, mixing the solutions of the two beakers, shaking up, adding a certain amount of 70 mu l of reducing agent and 0.47g of cationic monomer (DAC) into a reaction system, quickly shaking up, placing the mixture in the constant-temperature water bath kettle at the temperature of 50 ℃ for polymerization reaction, and continuously reacting for a period of time to obtain the modified sodium lignosulfonate hydrogel.
Wherein the reducing agent is Tetramethylethylenediamine (TEMED).
(4) The gel was cut into small pieces and soaked in a large amount of distilled water for 3 days with 2 water changes per day to remove unreacted monomers from the gel. And dehydrating the soaked gel at room temperature for two days, and drying in an oven at 60 ℃ to constant weight to obtain a xerogel sample.
Example 4
A method of making a hydrogel comprising the steps of:
(1) weighing 0.4g of sodium Lignosulfonate (LS), 1.4g of acrylamide monomer and 0.036g of cross-linking agent (MBA), putting into a beaker, adding a small amount of distilled water, and magnetically stirring for dissolving;
wherein the acrylamide monomer is n-isopropyl acrylamide.
(2) Weighing 0.22g of peroxide, putting the peroxide into another beaker, and adding a small amount of distilled water to prepare a solution;
wherein the initiator peroxide is Benzoyl Peroxide (BPO).
(3) Sealing the beakers of (1) and (2), preheating in a constant-temperature water bath kettle at 40 ℃ for 40min, mixing the solutions of the two beakers, shaking up, adding a certain amount of 70 mu l of reducing agent and 2.8g of cationic monomer (DAC) into the reaction system, quickly shaking up, placing in a constant-temperature water bath kettle at 60 ℃ for polymerization reaction, and continuously reacting for a period of time to obtain the modified sodium lignosulfonate hydrogel;
wherein the reducing agent is any one of Tetramethylethylenediamine (TEMED) and oxalic acid.
(4) The gel was cut into small pieces and soaked in a large amount of distilled water for 3 days with 2 water changes per day to remove unreacted monomers from the gel. And dehydrating the soaked gel at room temperature for two days, and drying in an oven at 60 ℃ to constant weight to obtain a xerogel sample.
Example 5
A method of making a hydrogel comprising the steps of:
(1) weighing 0.4g of sodium Lignosulfonate (LS), 1.4g of acrylamide monomer and 0.036g of cross-linking agent (MBA), putting into a beaker, adding a small amount of distilled water, and magnetically stirring for dissolving;
wherein the acrylamide monomer is polyacrylamide.
(2) Weighing 0.22g of initiator peroxide, putting the initiator peroxide into another beaker, and adding a small amount of distilled water to prepare a solution;
wherein the initiator peroxide is hydrogen peroxide.
(3) Sealing the beakers of (1) and (2), preheating in a 40 ℃ constant-temperature water bath for 50min, mixing the solutions of the two beakers, shaking up, adding a certain amount of 70 mu l of reducing agent and 0.70g of cationic monomer (DAC) into the reaction system, quickly shaking up, placing in a 40 ℃ constant-temperature water bath for polymerization reaction, and continuously reacting for a period of time to obtain the modified sodium lignosulfonate hydrogel;
wherein the reducing agent is Tetramethylethylenediamine (TEMED).
(4) The gel was cut into small pieces and soaked in a large amount of distilled water for 3 days with 2 water changes per day to remove unreacted monomers from the gel. And dehydrating the soaked gel at room temperature for two days, and drying in an oven at 60 ℃ to constant weight to obtain a xerogel sample.
Comparative example 1
The difference from example 4 is that: no cationic monomer DAC was added in step (3).
Comparative example 2
The difference from example 5 is that: no cationic monomer DAC was added in step (3).
Application test:
the modified sodium lignosulfonate hydrogels prepared in example 4 and comparative example 1 were subjected to a water absorption test, and 0.1g of dried gel was put into distilled water at room temperature, taken out with tweezers at regular intervals, and then the surface of the gel was covered with filter paperWater was wiped off and weighed. The results are shown in FIG. 3. Water absorption capacity (Q)t(g/g)) was calculated according to the following formula:
Figure BDA0002690511660000091
in the formula: m istExpressed as mass of gel at time t (g); m isoExpressed as mass (g) of xerogel.
Referring to FIG. 4, the water-absorbent hydrogel obtained in example 4 had a water absorption capacity of 58g/g in 700 minutes. Whereas the water-absorbent hydrogel obtained in comparative example 1 had a water absorption capacity of 15g/g (not shown) over 700 minutes.
The modified sodium lignosulfonate hydrogel prepared in example 5 is adsorbed with acid red 73 and Cr6+And (6) testing. The specific test steps are as follows: 0.1g of the xerogel prepared in example 5 was taken, put into distilled water at room temperature for swelling equilibrium, and then added to 50mL of a solution containing acid red 73 and Cr6+Statically adsorbing in 100mg/L solution at room temperature, collecting supernatant at certain intervals, and measuring acid red 73(AR 73) and Cr in the adsorbed solution with visible spectrophotometer6+The change in concentration was used to calculate the amount of adsorption. The results are shown in FIG. 5. Adsorption amount (Q)e(mg/g)) was calculated according to the following formula.
Figure BDA0002690511660000101
In the formula: coRepresents the concentration (mg/L) of the solution before adsorption; ctRepresents the remaining concentration (mg/L) after adsorption at a certain time; v represents solution volume (mL); m represents the xerogel mass (g).
As can be seen from FIG. 5, the adsorption amount of the hydrogel to acid Red 73 was as high as 45mg/g and to Cr in 12 hours6+The adsorption amount of the adsorbent is up to 20 mg/g. The hydrogel prepared in comparative example 1 adsorbed acid red 73 only in an amount of 0.075mg/g, and hardly adsorbed Cr6+The adsorption capacity of (A) is only 0.0125mg/g, and hardly adsorbed.
Compared with the prior art, the preparation method and the obtained product of the invention also have the following beneficial effects:
(1) the preparation process of the modified sodium lignosulfonate hydrogel is simple, easy to operate and mild in reaction conditions, effectively avoids the use of toxic and harmful organic solvents or strong acid and strong base, and is an environment-friendly preparation process.
(2) One of the raw materials of the hydrogel prepared by the method disclosed by the invention is industrial pulping waste liquid lignosulfonate, which is wide in source, non-toxic, cheap and easy to obtain and has good biocompatibility.
(3) The modified sodium lignosulfonate hydrogel prepared by the method disclosed by the invention has good water absorption performance, can effectively adsorb anionic dye and heavy metal ions in wastewater, achieves the effect of purifying sewage, and has good application prospect.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention.

Claims (10)

1. A hydrogel, which is prepared by mixing sodium lignin sulfonate, an acrylamide monomer and a crosslinking agent, dissolving the mixture in water to obtain a first mixture, adding a peroxide to the first mixture to obtain a second mixture, and adding a reducing agent and a cationic monomer to the second mixture to mix.
2. The hydrogel according to claim 1, wherein the mass ratio of the sodium lignin sulfonate to the acrylamide monomer is 1 (3-8).
3. The hydrogel according to claim 1, wherein the amount of the crosslinking agent is 1.5 to 10.5% by mass based on the amount of the acrylamide-based monomer.
4. The hydrogel according to claim 1, wherein the peroxide is used in an amount of 6.25 to 20.625% by mass based on the amount of the acrylamide-based monomer.
5. The hydrogel of claim 1, wherein the cross-linking agent is N, N' -methylenebisacrylamide; and/or the peroxide is one or more of hydrogen peroxide, ammonium persulfate, potassium persulfate and benzoyl peroxide; and/or the reducing agent is tetramethyl ethylene diamine and/or oxalic acid; and/or the cationic monomer is acryloyloxyethyl trimethyl ammonium chloride.
6. The hydrogel according to claim 1, wherein the mass ratio of the cationic monomer to the acrylamide-based monomer is 1:6 to 4: 1.
7. A method for preparing a hydrogel according to any one of claims 1 to 6, comprising the steps of:
s1, mixing sodium lignosulfonate, an acrylamide monomer and a cross-linking agent, and dissolving in water to obtain a first mixture;
s2, adding peroxide into the first mixture, and mixing and reacting to obtain a second mixture;
and S3, adding a reducing agent and a cationic monomer into the second mixture, and mixing to obtain the hydrogel.
8. The method according to claim 7, wherein in step S3, the reducing agent and the cationic monomer are added to the second mixture and mixed at 25 to 80 ℃ to obtain the hydrogel.
9. The method according to claim 7, wherein in step S1, the sodium lignosulfonate, the acrylamide monomer and the crosslinking agent are mixed and dissolved in water, and then preheated at 25-80 ℃ for 10-50min to obtain the first mixture.
10. Use of the hydrogel according to any one of claims 1 to 7 or the hydrogel produced by the method according to any one of claims 8 to 9 for the treatment of waste water containing dyes and/or heavy metal ions.
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CN113527715A (en) * 2021-06-15 2021-10-22 兰州大学 Multilayer hydrogel and preparation method and application thereof
CN113713784A (en) * 2021-09-09 2021-11-30 浙江赛格染整股份有限公司 Reverse suspension cross-linked polymeric aminated lignosulfonate adsorbent, and preparation method and application thereof
CN115678043A (en) * 2022-11-07 2023-02-03 华南农业大学 Zeolite-cellulose polyacrylamide composite hydrogel and preparation and application thereof
CN117510754A (en) * 2023-11-07 2024-02-06 广东医科大学附属医院 Biocompatible polymer composite material and preparation method and application thereof

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