CN114984926B - Preparation method of high-agglomeration-resistance RGO-based magnetic lithium ion imprinted polymer - Google Patents
Preparation method of high-agglomeration-resistance RGO-based magnetic lithium ion imprinted polymer Download PDFInfo
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Abstract
High anti-agglomerationA preparation method of RGO-based magnetic lithium ion imprinted polymer relates to a preparation method of lithium ion imprinted polymer. The invention aims to solve the problems of high cost, complicated steps and low adsorption capacity to lithium caused by the charge and easy agglomeration of the existing method for recovering lithium and the existing preparation method of the magnetic ion imprinted polymer. The method comprises the following steps: 1. preparation of Fe 3 O 4 RGO; 2. preparation of Fe 3 O 4 @SiO 2 The @ IIP/RGO is the magnetic lithium ion imprinted polymer with high anti-agglomeration RGO group. Compared with the existing lithium ion imprinting material, the high anti-agglomeration RGO-based magnetic lithium ion imprinting polymer prepared by the invention has obvious anti-agglomeration characteristic, and the saturated adsorption capacity is obviously improved. The adsorption rate of the high anti-agglomeration RGO-based magnetic lithium ion imprinted polymer prepared by the invention to lithium ions can reach 99.9%. The invention can obtain the high anti-agglomeration RGO-based magnetic lithium ion imprinted polymer.
Description
Technical Field
The invention relates to a preparation method of a lithium ion imprinted polymer.
Background
The lithium ion battery has the advantages of long service life, high energy storage density, strong adaptability to high and low temperatures and the like, and is widely applied to new energy vehicles and various portable electronic products. The global consumption of lithium reaches 90 ten thousand tons in 2021, and this figure has a trend to increase year by year. At present, the source of lithium mainly comes from lithium ores, but the resources of the lithium ores in China are limited, but the resources of salt lakes are rich. Therefore, the extraction of lithium from salt lake water has become a hot topic of resource conservation in recent years. The existing recovery technology mainly comprises an electrochemical deposition method and a chemical deposition method, but the recovery cost of the method is high and the steps are complicated. The ion imprinting technology is an emerging technology in the field of separation and purification, and has the characteristics of high specific efficiency and good selective separation effect. The magnetic ion imprinting polymer combines the advantages of the ion imprinting technology and the magnetic separation technology, and has the characteristics of economy, high efficiency and easy realization of industrialization. However, agglomeration of nanoparticle polymers results in a decrease in adsorption capacity and a complicated preparation process, which are major reasons for impeding further development of the technology.
Disclosure of Invention
The invention aims to solve the problems of high cost, complicated steps and low adsorption capacity to lithium caused by the fact that the existing lithium recovery method is responsible for and easy to agglomerate in the existing magnetic ion imprinted polymer preparation method, and provides a preparation method of a high anti-agglomeration RGO-based magnetic lithium ion imprinted polymer.
The preparation method of the high anti-agglomeration RGO-based magnetic lithium ion imprinted polymer is completed according to the following steps:
1. firstly, dissolving reduced graphene oxide in deionized water, and then adding FeSO 4 ·7H 2 O and FeCl 3 ·6H 2 O, dropwise adding NaOH solution under the conditions of oscillating in a water bath in a shaking table and introducing nitrogen into the solution, regulating the pH of the system, and finally carrying out water bath oscillating reaction in the shaking table under the protection of nitrogen atmosphere, wherein the reaction is finished to obtain a reaction product I; cleaning and drying the reaction product to obtain Fe 3 O 4 /RGO；
2. Preparation of Fe 3 O 4 @SiO 2 @IIP/RGO：
(1) Firstly, 1-aza-12-crown 4-ether, anhydrous lithium chloride, 3-aminopropyl triethoxysilane, tetraethoxysilane and Fe 3 O 4 Adding RGO into absolute ethyl alcohol, uniformly stirring, then adding deionized water/ammonia water mixed solution, and carrying out water bath oscillation reaction to obtain a reaction product II;
(2) firstly, washing a reaction product II by using absolute ethyl alcohol, then washing the reaction product II by using deionized water, and then washing the reaction product II by using hydrochloric acid until Li cannot be detected by ICP-AES + Then the reaction product II is washed by deionized water, and finally is dried in vacuum to obtain Fe 3 O 4 @SiO 2 The @ IIP/RGO is the magnetic lithium ion imprinted polymer with high anti-agglomeration RGO group.
The invention adopts Reduced Graphene Oxide (RGO) as a framework material, and Fe is adopted as a material 3 O 4 Inlaid inThe surface of which is combined with SiO 2 The modification method of the wrapped magnetic nano-particles grafts the 1-aza-12-crown 4-ether on the magnetic nano-particles, and finally prepares the RGO-based magnetic lithium ion imprinted polymer with high anti-agglomeration property through a one-step surface imprinting polymerization process, thereby having better application prospect.
The invention has the advantages that:
1. compared with the existing lithium ion imprinting material, the high anti-agglomeration RGO-based magnetic lithium ion imprinting polymer prepared by the invention has obvious anti-agglomeration characteristic, and the saturated adsorption capacity is obviously improved;
2. the high anti-agglomeration RGO-based magnetic lithium ion imprinted polymer prepared by the invention has the advantages of simple preparation method, sensitive adsorption, energy conservation compared with other selective recovery means, and good circulating effect;
3. aiming at the complex environment in the acid leaching solution of the waste lithium battery, the magnetic material is introduced into the polymer, so that the magnetic separation and recovery of the polymer after the working are facilitated;
4. the adsorption rate of the high anti-agglomeration RGO-based magnetic lithium ion imprinted polymer prepared by the invention to lithium ions can reach 99.9%.
The invention can obtain the high anti-agglomeration RGO-based magnetic lithium ion imprinted polymer.
Drawings
FIG. 1 is an SEM image of a high anti-agglomeration RGO based magnetic lithium ion imprinted polymer prepared in example 1;
FIG. 2 is an SEM image of a high anti-agglomeration RGO based magnetic lithium ion imprinted polymer prepared in example 1;
FIG. 3 is an SEM image of a high anti-agglomeration RGO based magnetic lithium ion imprinted polymer prepared in example 1.
Detailed Description
The following examples further illustrate the invention but are not to be construed as limiting the invention. Modifications and substitutions to methods, procedures, or conditions of the present invention without departing from the spirit of the invention are intended to be within the scope of the present invention.
The first embodiment is as follows: the preparation method of the high anti-agglomeration RGO-based magnetic lithium ion imprinted polymer is specifically completed by the following steps:
1. firstly, dissolving reduced graphene oxide in deionized water, and then adding FeSO 4 ·7H 2 O and FeCl 3 ·6H 2 O, dropwise adding NaOH solution under the conditions of oscillating in a water bath in a shaking table and introducing nitrogen into the solution, regulating the pH of the system, and finally carrying out water bath oscillating reaction in the shaking table under the protection of nitrogen atmosphere, wherein the reaction is finished to obtain a reaction product I; cleaning and drying the reaction product to obtain Fe 3 O 4 /RGO；
2. Preparation of Fe 3 O 4 @SiO 2 @IIP/RGO：
(1) Firstly, 1-aza-12-crown 4-ether, anhydrous lithium chloride, 3-aminopropyl triethoxysilane, tetraethoxysilane and Fe 3 O 4 Adding RGO into absolute ethyl alcohol, uniformly stirring, then adding deionized water/ammonia water mixed solution, and carrying out water bath oscillation reaction to obtain a reaction product II;
(2) firstly, washing a reaction product II by using absolute ethyl alcohol, then washing the reaction product II by using deionized water, and then washing the reaction product II by using hydrochloric acid until Li cannot be detected by ICP-AES + Then the reaction product II is washed by deionized water, and finally is dried in vacuum to obtain Fe 3 O 4 @SiO 2 The @ IIP/RGO is the magnetic lithium ion imprinted polymer with high anti-agglomeration RGO group.
The second embodiment is as follows: the present embodiment differs from the specific embodiment in that: the volume ratio of the mass of the reduced graphene oxide to the deionized water in the first step is (0.33 g-3 g) (60 mL-200 mL); feSO as described in step one 4 ·7H 2 The volume ratio of O to deionized water is (1.2 g-3.6 g) (60 mL-200 mL); feCl described in step one 3 ·6H 2 The volume ratio of O to deionized water is (2.33 g-6.99 g) (60 mL-200 mL). The other steps are the same as in the first embodiment.
And a third specific embodiment: this embodiment differs from the first or second embodiment in that: the revolution of the rotary stirring of the cradle in the first step is 60 r/min-120 r/min, and the temperature of the water bath is 60-80 ℃; the reaction time in the first step is 1-2 h. The other steps are the same as those of the first or second embodiment.
The specific embodiment IV is as follows: one difference between this embodiment and the first to third embodiments is that: in the first step, the pH value of the system is regulated to 8-10; the drying temperature in the first step is 30-50 ℃; the concentration of the NaOH solution in the step one is 1mol/L. The other steps are the same as those of the first to third embodiments.
Fifth embodiment: one to four differences between the present embodiment and the specific embodiment are: the water bath temperature in the second step (1) is 25-30 ℃, and the reaction time is 6-8 h. Other steps are the same as those of the first to fourth embodiments.
Specific embodiment six: the present embodiment differs from the first to fifth embodiments in that: the volume ratio of the mixed solution of the 1-aza-12-crown 4-ether, the 3-aminopropyl triethoxysilane, the tetraethoxysilane, the absolute ethyl alcohol and the deionized water/ammonia water in the step two (1) is (0.3 mL-0.9 mL), 2 mL-6 mL, 8 mL-24 mL, 20 mL-60 mL and 30 mL-90 mL. Other steps are the same as those of the first to fifth embodiments.
Seventh embodiment: one difference between the present embodiment and the first to sixth embodiments is that: anhydrous lithium chloride and Fe as described in step two (1) 3 O 4 The mass ratio of RGO is (1.29 g-3.87 g): 1.33 g-4 g. Other steps are the same as those of embodiments one to six.
Eighth embodiment: one difference between the present embodiment and the first to seventh embodiments is that: the volume ratio of the mass of the anhydrous lithium chloride to the 1-aza-12-crown 4-ether in the step two (1) is (1.29 g-3.8 g) (0.3 mL-0.9 mL). The other steps are the same as those of embodiments one to seven.
Detailed description nine: one of the differences between this embodiment and the first to eighth embodiments is: the volume ratio of deionized water to ammonia water in the deionized water/ammonia water mixed solution in the step two (1) is 2:1, wherein the mass fraction of the ammonia water is 25% -30%. Other steps are the same as those of embodiments one to eight.
Detailed description ten: the present embodiment differs from the first to ninth embodiments in that: the vacuum drying temperature in the second step (2) is 50-60 ℃; in the second step (2), firstly, absolute ethyl alcohol is used for cleaning the reaction product II for 3-5 times, then deionized water is used for cleaning the reaction product II for 3-5 times, and hydrochloric acid with the mass fraction of 35% -40% is used for cleaning the reaction product II until Li is not detected by ICP-AES + Then the deionized water is used for cleaning the reaction product II until the pH value is 7, and finally the vacuum drying is carried out to obtain Fe 3 O 4 @SiO 2 The @ IIP/RGO is the magnetic lithium ion imprinted polymer with high anti-agglomeration RGO group. The other steps are the same as those of embodiments one to nine.
The following examples are used to verify the benefits of the present invention:
example 1: the preparation method of the high anti-agglomeration RGO-based magnetic lithium ion imprinted polymer is characterized by comprising the following steps:
1. 1g of reduced graphene oxide was first dissolved in 66.37mL of deionized water, and then 1.20g of FeSO was added 4 ·7H 2 O and 2.33g FeCl 3 ·6H 2 O, dropwise adding 33.63mL of NaOH solution with the concentration of 1mol/L under the conditions of oscillating in a water bath at 80 ℃ in a shaking table and introducing nitrogen into the solution, and finally carrying out water bath oscillating reaction for 1h in the shaking table under the protection of nitrogen atmosphere, so as to obtain a reaction product I; washing the reaction product with deionized water for 6 times, and vacuum drying at 50deg.C to obtain Fe 3 O 4 /RGO；
The revolution of the rotary stirring of the cradle in the first step is 60r/min;
2. preparation of Fe 3 O 4 @SiO 2 @IIP/RGO：
(1) First, 0.3mL of 1-aza-12-crown 4-ether, 1.29g of anhydrous lithium chloride, 2mL of 3-aminopropyl triethoxysilane, 8mL of ethyl orthosilicate, and Fe obtained in the step one 3 O 4 Adding RGO into 20mL of absolute ethanol, stirring, adding 30Carrying out oscillation reaction on the mixed solution of the deionized water and the ammonia water in a water bath at 25 ℃ for 8 hours to obtain a reaction product II;
the volume ratio of deionized water to ammonia water in the deionized water/ammonia water mixed solution in the step two (1) is 2:1, wherein the mass fraction of the ammonia water is 25%;
(2) firstly, washing a reaction product II by using absolute ethyl alcohol for 5 times, then washing the reaction product II by using deionized water for 3-5 times, and then washing the reaction product II by using hydrochloric acid with the mass fraction of 35% until Li cannot be detected by ICP-AES + Washing the reaction product II with deionized water until the pH value is 7, and finally vacuum drying at 50 ℃ to obtain Fe 3 O 4 @SiO 2 The @ IIP/RGO is the magnetic lithium ion imprinted polymer with high anti-agglomeration RGO group.
Example 2: the preparation method of the high anti-agglomeration RGO-based magnetic lithium ion imprinted polymer is characterized by comprising the following steps:
1. first, 0.33g of reduced graphene oxide was dissolved in 66.37mL of deionized water, and then 1.20g of FeSO was added 4 ·7H 2 O and 2.33g FeCl 3 ·6H 2 O, dropwise adding 33.63mL of NaOH solution with the concentration of 1mol/L under the conditions of oscillating in a water bath at 80 ℃ in a shaking table and introducing nitrogen into the solution, and finally carrying out water bath oscillating reaction for 1h in the shaking table under the protection of nitrogen atmosphere, so as to obtain a reaction product I; washing the reaction product with deionized water for 6 times, and vacuum drying at 50deg.C to obtain Fe 3 O 4 /RGO；
The revolution of the rotary stirring of the cradle in the first step is 60r/min;
2. preparation of Fe 3 O 4 @SiO 2 @IIP/RGO：
(1) First, 0.3mL of 1-aza-12-crown 4-ether, 1.29g of anhydrous lithium chloride, 2mL of 3-aminopropyl triethoxysilane, 8mL of ethyl orthosilicate, and Fe obtained in the step one 3 O 4 Adding RGO into 20mL of absolute ethyl alcohol, uniformly stirring, then adding 30mL of deionized water/ammonia water mixed solution, and carrying out water bath oscillation reaction at 25 ℃ for 8 hours to obtain a reaction product II;
the volume ratio of deionized water to ammonia water in the deionized water/ammonia water mixed solution in the step two (1) is 2:1, wherein the mass fraction of the ammonia water is 28%;
(2) firstly, washing a reaction product II by using absolute ethyl alcohol for 5 times, then washing the reaction product II by using deionized water for 3-5 times, and then washing the reaction product II by using hydrochloric acid with the mass fraction of 35% until Li cannot be detected by ICP-AES + Washing the reaction product II with deionized water until the pH value is 7, and finally vacuum drying at 50 ℃ to obtain Fe 3 O 4 @SiO 2 The @ IIP/RGO is the magnetic lithium ion imprinted polymer with high anti-agglomeration RGO group.
Example 3: the preparation method of the high anti-agglomeration RGO-based magnetic lithium ion imprinted polymer is characterized by comprising the following steps:
1. first, 3g of reduced graphene oxide was dissolved in 66.37mL of deionized water, and then 1.20g of FeSO was added 4 ·7H 2 O and 2.33g FeCl 3 ·6H 2 O, dropwise adding 33.63mL of NaOH solution with the concentration of 1mol/L under the conditions of oscillating in a water bath at 80 ℃ in a shaking table and introducing nitrogen into the solution, and finally carrying out water bath oscillating reaction for 1h in the shaking table under the protection of nitrogen atmosphere, so as to obtain a reaction product I; washing the reaction product with deionized water for 6 times, and vacuum drying at 50deg.C to obtain Fe 3 O 4 /RGO；
The revolution of the rotary stirring of the cradle in the first step is 60r/min;
2. preparation of Fe 3 O 4 @SiO 2 @IIP/RGO：
(1) First, 0.3mL of 1-aza-12-crown 4-ether, 1.29g of anhydrous lithium chloride, 2mL of 3-aminopropyl triethoxysilane, 8mL of ethyl orthosilicate, and Fe obtained in the step one 3 O 4 Adding RGO into 20mL of absolute ethyl alcohol, uniformly stirring, then adding 30mL of deionized water/ammonia water mixed solution, and carrying out water bath oscillation reaction at 25 ℃ for 8 hours to obtain a reaction product II;
the volume ratio of deionized water to ammonia water in the deionized water/ammonia water mixed solution in the step two (1) is 2:1, wherein the mass fraction of the ammonia water is 30%;
(2) firstly, washing a reaction product II by using absolute ethyl alcohol for 5 times, then washing the reaction product II by using deionized water for 3-5 times, and then washing the reaction product II by using hydrochloric acid with the mass fraction of 35% until Li cannot be detected by ICP-AES + Washing the reaction product II with deionized water until the pH value is 7, and finally vacuum drying at 50 ℃ to obtain Fe 3 O 4 @SiO 2 The @ IIP/RGO is the magnetic lithium ion imprinted polymer with high anti-agglomeration RGO group.
FIG. 1 is an SEM image of a high anti-agglomeration RGO based magnetic lithium ion imprinted polymer prepared in example 1;
FIG. 2 is an SEM image of a high anti-agglomeration RGO based magnetic lithium ion imprinted polymer prepared in example 1;
FIG. 3 is an SEM image of a high anti-agglomeration RGO based magnetic lithium ion imprinted polymer prepared in example 1.
As can be seen by comparing fig. 1 to fig. 3, most of the polymer nanoparticles prepared in fig. 3 have a single sphere shape, and have the best dispersibility; the polymer nanoparticles prepared in fig. 1 begin to agglomerate, but still see a single sphere shape; the agglomeration of the polymer nanoparticles prepared in fig. 2 is most pronounced and the shape of individual spheres is not visible. Thus, RGO and Fe 3 O 4 When the mass ratio of the RGO-based magnetic lithium ion imprinted polymer is 3:1, the prepared RGO-based magnetic lithium ion imprinted polymer has the best anti-agglomeration characteristic.
Application performance measurement:
and respectively adding 0.2g of the high anti-agglomeration RGO-based magnetic lithium ion imprinted polymer prepared in examples 1-3 into 250mL of lithium ion-containing aqueous solution, carrying out oscillation reaction at a lithium ion concentration of 100mg/L, filtering, and measuring the lithium ion concentration in the filtrate, wherein the result is shown in Table 1.
TABLE 1
As can be seen from Table 1, due to the examples2 adding RGO and Fe 3 O 4 The mass ratio (1:3) of (2) is minimum, the agglomeration phenomenon is obvious, the specific surface area is minimum, therefore, the adsorption amount of lithium ions is minimum, namely 138.20mg/g, and in the embodiment 3, RGO and Fe are mixed 3 O 4 The mass ratio (3:1) is the largest, the anti-agglomeration effect is good, the specific surface area is the largest, so the adsorption quantity is the best, and the adsorption quantity is 256.43mg/g. Example 1 addition of RGO and Fe 3 O 4 The mass ratio (1:1) is moderate, the specific surface area and the adsorption capacity are also centered, and the adsorption capacity is 151.22mg/g; it is inferred that the addition amount of RGO is positively correlated with the adsorption amount within a certain range, RGO has obvious contribution to the anti-agglomeration effect of the polymer, and RGO and Fe are prepared in the process 3 O 4 The optimal mass ratio of (2) is 3:1. It is particularly pointed out that the adsorption capacity of the existing magnetic lithium ion imprinted polymer is approximately 130-150 mg/g, and compared with the existing magnetic lithium ion imprinted polymer, the RGO-based magnetic lithium ion imprinted polymer with high anti-agglomeration characteristic has larger improvement on the adsorption capacity of lithium ions.
The RGO-based magnetic lithium ion imprinted polymer with high anti-agglomeration characteristic and the preparation method thereof are described through examples, and a related person can obviously change or appropriately change and combine the contents described herein to realize the invention without departing from the content, spirit and scope of the invention. It is expressly intended that all such similar substitutes and modifications apparent to those skilled in the art are deemed to be included within the spirit, scope and content of the invention.
Claims (6)
1. The preparation method of the high anti-agglomeration RGO-based magnetic lithium ion imprinted polymer is characterized by comprising the following steps:
1. firstly, dissolving reduced graphene oxide in deionized water, and then adding FeSO 4 ·7H 2 O and FeCl 3 ·6H 2 O, dropwise adding NaOH solution under the conditions of oscillating in a water bath in a shaking table and introducing nitrogen into the solution, regulating the pH value of the system, and finally carrying out water bath oscillating reaction in the shaking table under the protection of nitrogen atmosphere to reversely reactEnding to obtain a reaction product I; cleaning and drying the reaction product to obtain Fe 3 O 4 /RGO；
Fe as described in step one 3 O 4 RGO and Fe in RGO 3 O 4 The mass ratio of (2) is 3:1;
2. preparation of Fe 3 O 4 @SiO 2 @IIP/RGO：
(1) Firstly, 1-aza-12-crown 4-ether, anhydrous lithium chloride, 3-aminopropyl triethoxysilane, tetraethoxysilane and Fe 3 O 4 Adding RGO into absolute ethyl alcohol, uniformly stirring, then adding deionized water/ammonia water mixed solution, and carrying out water bath oscillation reaction to obtain a reaction product II;
the volume ratio of the mixed solution of the 1-aza-12-crown 4-ether, the 3-aminopropyl triethoxysilane, the tetraethoxysilane, the absolute ethyl alcohol and the deionized water/ammonia water in the step two (1) is (0.3 mL-0.9 mL): 2 mL-6 mL: (8 mL-24 mL): (20 mL-60 mL): (30 mL-90 mL);
anhydrous lithium chloride and Fe as described in step two (1) 3 O 4 The mass ratio of the RGO is (1.29 g-3.87 g): 1.33 g-4 g;
the volume ratio of the mass of the anhydrous lithium chloride to the 1-aza-12-crown 4-ether in the step two (1) is (1.29 g-3.8 g) (0.3 mL-0.9 mL);
the volume ratio of deionized water to ammonia water in the deionized water/ammonia water mixed solution in the step two (1) is 2:1, wherein the mass fraction of the ammonia water is 25% -30%;
(2) firstly, washing a reaction product II by using absolute ethyl alcohol, then washing the reaction product II by using deionized water, and then washing the reaction product II by using hydrochloric acid until Li cannot be detected by ICP-AES + Then the reaction product II is washed by deionized water, and finally is dried in vacuum to obtain Fe 3 O 4 @SiO 2 The @ IIP/RGO is the magnetic lithium ion imprinted polymer with high anti-agglomeration RGO group.
2. The method for preparing the high-agglomeration-resistance RGO-based magnetic lithium ion imprinted polymer according to claim 1The method is characterized in that the volume ratio of the mass of the reduced graphene oxide to the deionized water in the first step is (0.33 g-3 g) (60 mL-200 mL); feSO as described in step one 4 ·7H 2 The volume ratio of O to deionized water is (1.2 g-3.6 g) (60 mL-200 mL); feCl described in step one 3 ·6H 2 The volume ratio of O to deionized water is (2.33 g-6.99 g) (60 mL-200 mL).
3. The preparation method of the high-agglomeration-resistance RGO-based magnetic lithium ion imprinted polymer, which is characterized in that the rotation number of the rotary stirring of a shaking table in the first step is 60-120 r/min, and the temperature of a water bath is 60-80 ℃; the reaction time in the first step is 1-2 h.
4. The preparation method of the high-agglomeration-resistance RGO-based magnetic lithium ion imprinted polymer, which is characterized in that the pH value of a system is adjusted to 8-10 in the first step; the drying temperature in the first step is 30-50 ℃; the concentration of the NaOH solution in the step one is 1mol/L.
5. The preparation method of the high agglomeration resistant RGO-based magnetic lithium ion imprinted polymer according to claim 1, wherein the water bath temperature in the second step (1) is 25-30 ℃, and the reaction time is 6-8 h.
6. The preparation method of the high-agglomeration-resistance RGO-based magnetic lithium ion imprinted polymer, which is characterized in that the vacuum drying temperature in the second step (2) is 50-60 ℃; in the second step (2), firstly, absolute ethyl alcohol is used for cleaning the reaction product II for 3-5 times, then deionized water is used for cleaning the reaction product II for 3-5 times, and hydrochloric acid with the mass fraction of 35% -40% is used for cleaning the reaction product II until Li is not detected by ICP-AES + Then the deionized water is used for cleaning the reaction product II until the pH value is 7, and finally the vacuum drying is carried out to obtain Fe 3 O 4 @SiO 2 The @ IIP/RGO is highly anti-agglomerationRGO-based magnetic lithium ion imprinted polymers.
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