CN114392728A - Magnetic hydrogel capable of efficiently adsorbing cationic dye and preparation method and application thereof - Google Patents
Magnetic hydrogel capable of efficiently adsorbing cationic dye and preparation method and application thereof Download PDFInfo
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Abstract
The invention provides a magnetic hydrogel capable of efficiently adsorbing cationic dyes, a preparation method and application thereof, the preparation method can prepare the magnetic hydrogel capable of efficiently adsorbing cationic dyes by combining a simple free radical polymerization method and an in-situ coprecipitation method, has a good selective adsorption effect on the cationic dyes, can reach the highest adsorption quantity of 2025mg/g on methylene blue cationic dyes, has recoverability on the adsorption of dyes, can still keep more than 90% of adsorption capacity after 5 times of cyclic adsorption-desorption, and has the advantages of simple preparation method, low process cost and wide application prospect.
Description
Technical Field
The application relates to the field of material preparation, in particular to a magnetic hydrogel capable of efficiently adsorbing cationic dye and a preparation method and application thereof.
Background
In recent years, with the continuous development of scientific technology, the dye manufacturing industry is introduced into human life, and up to now, over 10 thousands of different water-soluble organic dyes are widely applied to the industries of textile, paper making, printing, leather, polymer, cosmetics and the like. However, organic waste dye emissions have posed a serious hazard to the surrounding environment as well as human life. Since organic dyes are considerably toxic to the surrounding environment and human health even at low concentrations and may cause carcinogenesis and mutagenic effects, which may lead to health disorders such as dysfunction. Thus, the contamination of aquatic systems with increasingly serious organic dye contaminants is a major challenge in the field of environmental science. Therefore, various technologies generated for water purification have been widely researched and applied by researchers. Among them, the adsorption technique is the most promising method due to its low cost, simple design, high efficiency, and convenient operation. Driven by such a demand for traction and technical development, the urgent development of dye adsorbents having high adsorption performance is receiving increasing social attention and receiving more and more attention from research workers. Therefore, the high-efficiency adsorption material gradually becomes an important branch of functional materials and becomes an important part in the research field of new materials.
The magnetic nano material can be efficiently, quickly and economically separated from a dye medium under the action of an external magnetic field, effectively avoids secondary pollution, and is widely used as a dye adsorbent in the fields of water body purification and environmental protection. For example, patent publication CN107866209A discloses a magnetic dye adsorbent, and indicates that the obtained magnetic nanoparticles can be subjected to surface modification, selective separation and cyclic regeneration of organic dye, and can adsorb methylene blue (with a mass concentration of 1000mg/L) in an environment with a pH of 10, and the adsorption capacity is 0.712 mmol/g. The dye adsorbent has the advantages of complex preparation process, low adsorption quantity, easy aggregation among particles, influence on adsorption performance and limitation on application range. Based on the method, the magnetic hydrogel capable of efficiently adsorbing the cationic dye has excellent selective adsorption performance on the cationic dye, particularly has the adsorption amount of 2025mg/g on the methylene blue cationic dye, and has the adsorption effect far higher than that of a reported magnetic adsorbent. In addition, the cationic dye has good cyclic adsorption effect on methylene blue cationic dyes.
Disclosure of Invention
The application provides a preparation method of magnetic hydrogel with simple preparation process and capable of efficiently adsorbing cationic dye, which comprises the following steps:
s1: providing a silk fibroin solution;
s2: mixing the silk fibroin solution with a polymer monomer to obtain a first mixed solution;
s3: sequentially adding inorganic salt, a surfactant and an initiator into the first mixed solution, and uniformly mixing to obtain a second mixed solution;
s4: gelatinizing the second mixed solution to obtain interpenetrating network hydrogel;
s5: soaking the interpenetrating network hydrogel in an iron ion solution to obtain an iron ion-loaded interpenetrating network hydrogel;
s6: soaking the iron ion loaded interpenetrating network hydrogel in an alkaline solution to obtain the magnetic hydrogel capable of efficiently adsorbing the cationic dye;
the average particle size of the magnetic particles in the magnetic hydrogel is 5 nm-50 nm.
In one embodiment, the step S1 includes:
s101: placing the silkworm cocoons in a boiling sodium bicarbonate solution for degumming to obtain prefabricated silk fibroin fibers; the mass ratio of the sodium bicarbonate to the silkworm cocoons is 1: 2-2: 1;
s102: putting the prefabricated silk fibroin fibers into boiling pure water, boiling for 10-30 minutes, taking out, and wringing to obtain the silk fibroin fibers;
s103: dissolving the obtained silk fibroin fibers in a lithium bromide solution with the concentration of 8-10M, and dissolving for 30 min-8 h at the temperature of 50-65 ℃; obtaining a third transparent liquid;
s104: dialyzing the third clear solution for 1 to 3 days.
In one embodiment, the mass ratio of the silk fibroin in the silk fibroin solution to the polymer monomer is 1: 5-1: 15.
in one embodiment, the inorganic salt is one or more of sodium chloride, lithium chloride, calcium chloride and zinc chloride, and the concentration of the inorganic salt added in the first mixed solution is 1mg/mL to 5 mg/mL.
In one embodiment, the inorganic salt is one or more of sodium chloride, lithium chloride, calcium chloride and zinc chloride, the concentration of the inorganic salt added in the first mixed solution is 1mg/mL to 5mg/mL, the stabilizer is one or more of sodium dodecyl sulfate and sodium dodecyl sulfate, and the concentration of the stabilizer in the first mixed solution is 0.1mg/mL to 0.5 mg/mL.
In one embodiment, the initiator is ammonium persulfate, and the concentration of the initiator in the second mixed solution is 0.1 mg/mL-1.5 mg/mL.
In one embodiment, the reaction conditions of step S4 are: reacting for 6-24 h at 40-60 ℃.
In one embodiment, the iron ion solution is a mixed solution of ferrous iron ions and ferric iron ions, the ferrous iron ions are ferrous chloride, the ferric iron ions are ferric chloride, and the molar ratio of the ferrous iron ions to the ferric iron ions is 1: 2-1: 1.
in one embodiment, the soaking conditions in step S5 are: standing for 24-96 h at the temperature of 4-30 ℃, and then pouring out the reaction solution;
the soaking conditions in the step S6 are as follows: standing for 6-24 h at the temperature of 20-30 ℃.
In another aspect of the present application, the preparation method described in any one of the above is claimed, and the obtained hydrogel can efficiently adsorb cationic dye.
In another aspect of the present invention, the application of the aforementioned magnetic hydrogel capable of adsorbing cationic dye with high efficiency is claimed, and the application fields thereof include: water body purification, environmental protection and biomedical field. The preparation method can prepare the magnetic hydrogel capable of efficiently adsorbing the cationic dye by combining a simple free radical polymerization method and an in-situ coprecipitation method, has a good selective adsorption effect on the cationic dye, can achieve the highest adsorption quantity of 2025mg/g on the methylene blue cationic dye, has recoverability on the adsorption of the dye, can still maintain more than 90% of adsorption capacity after 5 times of cyclic adsorption-desorption, and has the advantages of simple preparation method, low process cost and wide application prospect.
Drawings
The following detailed description of embodiments of the invention is provided in conjunction with the appended drawings:
FIG. 1 shows a method for preparing a magnetic hydrogel capable of efficiently adsorbing cationic dyes according to one embodiment of the present invention;
FIG. 2 shows a photograph of a magnetic hydrogel prepared in example 1 of the present invention;
FIG. 3 shows an electron micrograph of a magnetic hydrogel used in example 1 of the present invention;
FIG. 4a shows an electron micrograph of magnetic particles in a magnetic hydrogel used in example 1 of the present invention; FIG. 4b shows the particle size statistics of the magnetic particles in the magnetic hydrogel used in example 1 of the present invention;
FIG. 5a shows a magnetic photograph of a magnetic hydrogel prepared in example 1 of the present invention; FIG. 5b shows a graph of magnetic signature data for a magnetic hydrogel prepared in example 1 of the present invention;
FIG. 6a is a graph showing adsorption data for methylene blue cationic dye of example 1 of the present invention; FIG. 6b shows a graph of crystal violet cationic dye adsorption data for example 1 of the present invention; FIG. 6c is a graph showing adsorption data for methyl orange anionic dye of example 1 of the present invention; FIG. 6d is a graph showing Congo red anionic dye adsorption data for example 1 of the present invention;
FIG. 7 is a graph showing adsorption data for methylene blue cationic dye of example 1 of the present invention;
figure 8 shows a graph of the cyclic adsorption data for methylene blue cationic dye of example 1 of the present invention.
Detailed Description
In order to clarify the invention in more detail, the technical solution of the invention is further elucidated below with reference to a preferred embodiment and the accompanying drawings.
As shown in FIG. 1, the present invention provides a novel method for preparing a magnetic hydrogel capable of efficiently adsorbing cationic dyes, comprising the following steps: s1: providing a silk fibroin solution; s2: mixing the silk fibroin solution with a polymer monomer to obtain a first mixed solution; s3: sequentially adding inorganic salt, a surfactant and an initiator into the first mixed solution, and uniformly mixing to obtain a second mixed solution; s4: gelatinizing the second mixed solution to obtain interpenetrating network hydrogel; s5: soaking the interpenetrating network hydrogel in an iron ion solution to obtain an iron ion-loaded interpenetrating network hydrogel; s6: soaking the iron ion loaded interpenetrating network hydrogel in an alkaline solution to obtain the magnetic hydrogel capable of efficiently adsorbing the cationic dye; the average particle size of the magnetic particles in the magnetic hydrogel is 5 nm-50 nm.
In a preferred embodiment, the above steps S1-S6 are performed sequentially in order. The preparation method can prepare the magnetic hydrogel capable of efficiently adsorbing the cationic dye by combining a simple free radical polymerization method and an in-situ coprecipitation method, and the magnetic hydrogel has good cation selective adsorption performance and excellent cyclic adsorption capacity.
The silk fibroin in the present application can be known in the art, or can be prepared by known methods, and can be self-adjusted according to the needs of the skilled in the art, and in some preferred embodiments, the silk fibroin is prepared by the following steps, i.e., step S1 can further comprise the following steps:
s101: placing the silkworm cocoons in a boiling sodium bicarbonate solution for degumming to obtain prefabricated silk fibroin fibers; the mass ratio of the sodium bicarbonate to the silkworm cocoons is 1: 2-2: 1;
s102: putting the prefabricated silk fibroin fibers into boiling pure water, boiling for 10-30 minutes, taking out, and wringing to obtain the silk fibroin fibers;
s103: dissolving the obtained silk fibroin fibers in a lithium bromide solution with the concentration of 8-10M, and dissolving for 30 min-8 h at the temperature of 50-65 ℃; obtaining a third transparent liquid;
s104: dialyzing the third clear solution for 1 to 3 days.
Preferably, the polymer monomer is acrylamide. More preferably, the mass ratio of silk fibroin in the silk fibroin solution to the polymer monomer is 1: 5-1: 15.
preferably, the inorganic salt is one or more of sodium chloride, lithium chloride, calcium chloride and zinc chloride, and more preferably, the inorganic salt is calcium chloride. More preferably, the concentration of the inorganic salt in the first mixed solution is: 1 mg/mL-5 mg/mL; further preferably, the concentration of the inorganic salt in the first mixed solution is 2 mg/mL.
Preferably, the stabilizer is one or more of sodium dodecyl sulfate and sodium dodecyl sulfate, more preferably, the stabilizer is sodium dodecyl sulfate, and further preferably, the concentration of the stabilizer in the first mixed solution is 0.1 mg/mL-0.5 mg/mL; most preferably, the concentration of the stabilizer in the first mixed solution is 0.2 mg/mL.
Preferably, the initiator is ammonium persulfate, and further preferably, the concentration of the initiator in the second mixed solution is 0.2 mg/mL-1.5 mg/mL. Most preferably, the concentration of the initiator in the second mixed solution is 0.28 mg/mL.
Preferably, the gelation process in step S4 is gelation by means of temperature conditions in a water bath. In some preferred embodiments, the gelation conditions in step S4 are: the gelation temperature is 40-60 ℃, and the gelation time is 6-24 h. The appropriate temperature condition can improve the gelling effect of the hydrogel in the gelling process. The color of the interpenetrating network hydrogel obtained after gelation is milky white.
Preferably, the iron ion solution is a mixed solution of ferrous ions and ferric ions. Further preferably, the molar mass ratio of the ferrous ions to the ferric ions in the ferric ion solution is 1: 2-1: 1, most preferably, the molar mass ratio of ferrous ions to ferric ions is 2: 3.
preferably, the divalent iron ion may be derived from ferrous chloride. Likewise, the iron salt may be present as a hydrated salt when added, for example ferrous chloride may be ferrous chloride tetrahydrate. Most preferably, the divalent iron ion is selected from ferrous chloride tetrahydrate.
Preferably, the ferric ions may be from ferric chloride. Likewise, the iron salt may be present as a hydrated salt when added, for example the ferric chloride may be ferrous chloride hexahydrate. Most preferably, the ferric ion is selected from ferric chloride hexahydrate.
Preferably, the alkaline solution is a sodium hydroxide solution or an ammonium hydroxide solution, most preferably, the alkaline solution is a sodium hydroxide solution. Further preferably, the concentration of the alkaline solution is 0.1M to 1M, most preferably, the concentration of the alkaline solution is 0.5M.
Preferably, the preparation conditions of the iron ion-loaded interpenetrating network hydrogel in step S5 are as follows: the temperature is 4-30 ℃, and the reaction time is 24-72 h. More optimally, the preparation condition of the iron ion supported interpenetrating network hydrogel can be carried out at the temperature as low as 4 ℃. The obtained iron ion-loaded interpenetrating network hydrogel is yellow in color.
Preferably, the magnetic hydrogel in step S6 is performed under ambient temperature conditions. In a preferred embodiment, the magnetic hydrogel preparation conditions in step S6 are: the temperature is 20-30 ℃, the reaction time is 6-24 h, and the color of the obtained magnetic hydrogel is black.
The magnetic hydrogel prepared by the method comprises the following components: silk fibroin, a polymer monomer, inorganic salt, a surfactant, an initiator, an interpenetrating network hydrogel, an iron ion solution, an iron ion loaded interpenetrating network hydrogel and an alkaline solution; the inorganic salt, the surfactant, the polymer monomer and the initiator are dispersed in the silk fibroin solution; the interpenetrating network hydrogel is soaked in an iron ion solution; soaking the iron ion-loaded interpenetrating network hydrogel in an alkaline solution; the mass ratio of the silk fibroin to the polymer monomer is 1: 5-1: 15; the magnetic hydrogel has good selective adsorption capacity on cationic dyes and has high-efficiency cationic adsorption effect, for example, the magnetic hydrogel has excellent adsorption effect on cationic dyes such as methylene blue, crystal violet, rhodamine B and the like, particularly has adsorption capacity of 2025m/g on the cationic dyes of the methylene blue, has excellent cyclic adsorption capacity, and can still reach 90% of adsorption capacity after 5 times of cyclic adsorption-desorption.
The following examples are provided to further illustrate the highly effective cationic dye magnetic hydrogel in the present application:
example 1
Collecting 30g of purchased silkworm cocoon, cutting into pieces, putting into 2.5L of 30g sodium bicarbonate-containing boiling water, decocting for 30min, taking out, wringing, washing with ultrapure water, and wringing; repeating the above steps at least 3 times. Then, sodium bicarbonate was replaced with ultrapure water, boiling was repeated three times to absorb the residual sodium bicarbonate, and then the wrung sample was put into an oven at 40 ℃ overnight to obtain silk fibroin. Taking 7g of the obtained silk fibroin fibers, adding the obtained silk fibroin fibers into 49mL of newly-prepared 9.3M lithium bromide (LiBr) aqueous solution for dissolution, reacting at 60 ℃ for 1h to obtain a light yellow transparent solution, and transferring the obtained solution into a dialysis bag with a molecular cut-off of 3500KDa for dialysis for three days to remove lithium bromide. Finally, a 5 wt% SF solution was obtained.
2.5g of acrylamide was added to 5mL of a 4 wt% silk fibroin solution and mixed well. Then, 100. mu.L of calcium chloride having a concentration of 0.1g/mL, 100. mu.L of sodium lauryl sulfate having a concentration of 0.01g/mL and 200. mu.L of ammonium persulfate having a concentration of 0.014g/mL were added and mixed well, and then placed in a water bath to react at 55 ℃ for 12 hours to complete the polymerization process. Finally, the prepared hydrogel was rinsed with a large amount of deionized water to remove unreacted chemicals, resulting in a tough interpenetrating network hydrogel (SF-PAAM).
Soaking SF-PAAM hydrogel in 0.2M FeCl3·6H2O and 0.3M FeCl2·4H2Placing the O mixed solution into a refrigerator with the temperature of 4 ℃, soaking for 72 hours until the expansion balance is reached, and obtaining the load Fe2+/Fe3+The SF-PAAM hydrogel of (1). Then will load Fe2+/Fe3+The SF-PAAM hydrogel is soaked in 0.5M NaOH solution for 24 hours at room temperature to ensure that Fe3O4Precipitation of nanoparticles in SF-PAAM hydrogel polymer network to obtain magnetic hydrogels (Fe)3O4@ SF-PAAM). Finally, the prepared Fe3O4The @ SF-PAAM hydrogel was soaked in deionized water for 24h to remove unreacted chemicals.
Fig. 2 shows a photograph of the magnetic hydrogel of example 1, and it can be seen that the magnetic hydrogel appears black.
FIG. 3 shows a scanning electron micrograph of the magnetic hydrogel of example 1, and it can be seen that the magnetic hydrogel has a porous structure and large pore sizes.
FIG. 4a shows a transmission electron micrograph of the magnetic particles in the magnetic hydrogel of example 1, which shows that the magnetic particles in the magnetic hydrogel have good dispersibility, smaller size and are relatively uniform. As can be seen in FIG. 4b, the average particle size was 10.61 nm.
The magnetic characteristics of example 1 were tested and it can be seen from fig. 5a that the hydrogel samples with magnetic properties formed good adsorption on the magnet. As can be seen from FIG. 5b, the magnetic saturation intensity of the magnetic hydrogel sample was 10.2 emu/g.
The dye adsorption performance was tested for example 1, and the adsorption amount (q)e) And the removal rate (R%) was evaluated by the following formulas (1) to (2)
Wherein C is0(mg/L) and Ct(mg/L) dye concentrations at initial time and time t, respectively; v (L) is the volume of the dye solution, and m (g) is the mass of the dry adsorbent.
The cationic dye selective adsorption performance test was performed on example 1, and 4 dye solutions containing 2 dyes were usedCationic dyes, Methylene Blue (MB), Crystal Violet (CV), and 2 anionic dyes, Methyl Orange (MO), Congo Red (CR), respectively: mixing 1mg of Fe3O4And respectively adding the @ SF-PAAM adsorbent into 4mL of dye solution, placing the dye solution in a constant temperature shaking table at 200rpm, reacting for 24 hours at the temperature of 25 ℃ under a neutral condition, taking out supernate, measuring absorbance by using an ultraviolet spectrophotometer, and drawing a concentration-absorbance curve.
Figure 6 shows the results of example 1 for the selective adsorption of cationic dyes. The selected cationic dyes are Methylene Blue (MB), Crystal Violet (CV) and anionic dyes are Methyl Orange (MO) and Congo Red (CR). It can be seen that the sample obtained in example 1 of the present application has an excellent selective adsorption effect on the cationic dye.
The adsorption amount of methylene blue cationic dye was measured for example 1, and 1mg of Fe was added3O4Adding @ SF-PAAM into 4mL MB solution with concentration of 10mg/L-1000mg/L, placing in a constant temperature shaking table at 200rpm and 25 ℃ under a neutral environment for 24h, taking supernate to measure absorbance value, drawing a concentration-absorbance curve, and finding out the concentration C of MB in the solution after adsorption according to the curveMB。
Fig. 7 shows the adsorption results of example 1 of the present invention to a methylene blue cationic dye. It can be seen that the sample obtained in example 1 of the present application has a high adsorption capacity of 2025mg/g for methylene blue cationic dye.
Example 1 was tested for methylene blue cationic dye adsorption cycling performance by adding 2mg of Fe3O4Adding @ SF-PAAM into 8mL of MB solution with the concentration of 40mg/L, placing the MB solution in a constant-temperature shaking table at the temperature of 25 ℃ at 200rpm under a neutral environment for 24 hours, taking supernate to measure the absorbance value, and calculating the adsorption efficiency. Then Fe adsorbing MB3O4The @ SF-PAAM gel was eluted with 0.01M HCl solution, regenerated in NaOH and ultrapure water, and the recovered absorbent was used for the next adsorption cycle.
FIG. 8 shows the results of the cyclic adsorption of methylene blue cationic dye by example 1 of the present invention. It can be seen that the sample obtained in example 1 in the present application has good cyclic adsorption capacity for methylene blue cationic dye, and after 5 times of cyclic adsorption-desorption, the adsorption efficiency can still reach 90%, and the sample can be reused.
Table 1 shows the results of comparing the adsorption amount of the methylene blue cationic dye of example 1 of the present invention with that of the reference. It can be seen that the adsorption amount of the sample obtained in example 1 in the present application to the methylene blue cationic dye is better than that of the sample in the reference.
TABLE 1 Fe3O4Comparison of the ability of @ SF-PAAM to adsorb methylene blue dye with other adsorbents
The magnetic hydrogel capable of efficiently adsorbing the cationic dye prepared in the application can be widely applied to the fields of water purification, environmental protection and the like.
Finally, it should be noted that: the above-mentioned embodiments are merely preferred examples for clearly illustrating the invention, but are not limited to the embodiments of the invention, and it should be understood by those skilled in the art that the technical features in the above-mentioned embodiments can be combined arbitrarily, and other modifications in different forms or equivalent replacements of part of the technical features can be made on the basis of the above-mentioned embodiments, and not all embodiments can be exhaustive, so that any modifications, improvements, equivalents and the like which are included in the technical solution of the present invention are within the technical scope of the claims of the present invention.
Claims (10)
1. A preparation method of a magnetic hydrogel capable of efficiently adsorbing cationic dyes is characterized by comprising the following steps:
s1: providing a silk fibroin solution;
s2: mixing the silk fibroin solution with a polymer monomer to obtain a first mixed solution;
s3: sequentially adding inorganic salt, a surfactant and an initiator into the first mixed solution, and uniformly mixing to obtain a second mixed solution;
s4: gelatinizing the second mixed solution to obtain interpenetrating network hydrogel;
s5: soaking the interpenetrating network hydrogel in an iron ion solution to obtain an iron ion-loaded interpenetrating network hydrogel;
s6: soaking the iron ion loaded interpenetrating network hydrogel in an alkaline solution to obtain a magnetic hydrogel capable of efficiently adsorbing cationic dye;
the average particle size of the magnetic particles in the magnetic hydrogel is 5 nm-50 nm.
2. The method for preparing a magnetic hydrogel capable of adsorbing cationic dyes with high efficiency according to claim 1, wherein the step S1 comprises:
s101: placing the silkworm cocoons in a boiling sodium bicarbonate solution for degumming to obtain prefabricated silk fibroin fibers; the mass ratio of the sodium bicarbonate to the silkworm cocoons is 1: 2-2: 1;
s102: putting the prefabricated silk fibroin fibers into boiling pure water, boiling for 10-40 minutes, taking out, and wringing to obtain the silk fibroin fibers;
s103: dissolving the obtained silk fibroin fibers in a lithium bromide solution with the concentration of 8-10M, and dissolving for 0.5-8 h at the temperature of 50-65 ℃; obtaining a third transparent liquid;
s104: dialyzing the third clear solution for 1 to 3 days.
3. The method for preparing the magnetic hydrogel capable of efficiently adsorbing the cationic dye according to claim 1, wherein the mass ratio of the silk fibroin in the silk fibroin solution to the polymer monomer is 1: 5-1: 15.
4. the method for preparing a magnetic hydrogel capable of efficiently adsorbing cationic dyes according to claim 1, wherein the inorganic salt is one or more of sodium chloride, lithium chloride, calcium chloride and zinc chloride, the concentration of the inorganic salt added in the first mixed solution is 1mg/mL to 5mg/mL, the stabilizer is one or more of sodium dodecyl sulfate and sodium dodecyl sulfate, and the concentration of the stabilizer in the first mixed solution is 0.1mg/mL to 0.5 mg/mL.
5. The method for preparing a magnetic hydrogel capable of efficiently adsorbing cationic dyes according to claim 1, wherein the concentration of the initiator in the second mixed solution is 0.1mg/mL to 1.5 mg/mL.
6. The method for preparing the magnetic hydrogel capable of efficiently adsorbing the cationic dye according to claim 1, wherein the method comprises the following steps:
the reaction conditions of the step S4 are as follows: reacting for 6-24 h at 40-60 ℃, and cleaning residual solvent on the surface of the sample by deionized water.
7. The method for preparing the magnetic hydrogel capable of efficiently adsorbing the cationic dye according to claim 1, wherein the iron ion solution is a mixed solution of ferrous ions and ferric ions, the ferrous ions are ferrous chloride, the ferric ions are ferric chloride, and the molar ratio of the ferrous ions to the ferric ions is 1: 2-1: 1.
8. the method for preparing the magnetic hydrogel capable of efficiently adsorbing the cationic dye according to claim 1, wherein the method comprises the following steps:
the soaking conditions in the step S5 are as follows: standing for 24-96 h at the temperature of 4-30 ℃, and then pouring out the reaction solution;
the soaking conditions in the step S6 are as follows: standing for 6-24 h at the temperature of 20-30 ℃.
9. The method for preparing the magnetic hydrogel capable of efficiently adsorbing the cationic dye according to claim 1, wherein the method comprises the following steps: the method for preparing the magnetic hydrogel capable of efficiently adsorbing the cationic dye according to any one of claims 1 to 9.
10. The application of the magnetic hydrogel for adsorbing the cationic dye with high efficiency as claimed in claim 10, wherein the application fields comprise: water body purification, environmental protection and biomedical field.
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