CN116586029A - Modified MXene adsorption material and preparation method and application thereof - Google Patents

Modified MXene adsorption material and preparation method and application thereof Download PDF

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CN116586029A
CN116586029A CN202310673095.2A CN202310673095A CN116586029A CN 116586029 A CN116586029 A CN 116586029A CN 202310673095 A CN202310673095 A CN 202310673095A CN 116586029 A CN116586029 A CN 116586029A
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mxene
cuhcf
mixed solution
composite material
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CN116586029B (en
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胡佩卓
王剑丽
王鑫
张干
林雨辰
邵柯进
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Lanzhou University
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
    • B01J20/0259—Compounds of N, P, As, Sb, Bi
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
    • B01J20/0225—Compounds of Fe, Ru, Os, Co, Rh, Ir, Ni, Pd, Pt
    • B01J20/0229—Compounds of Fe
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
    • B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
    • B01J20/0203—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising compounds of metals not provided for in B01J20/04
    • B01J20/0233—Compounds of Cu, Ag, Au
    • B01J20/0237—Compounds of Cu
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • 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
    • B01J20/28042—Shaped bodies; Monolithic structures
    • B01J20/28045—Honeycomb or cellular structures; Solid foams or sponges
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21F—PROTECTION AGAINST X-RADIATION, GAMMA RADIATION, CORPUSCULAR RADIATION OR PARTICLE BOMBARDMENT; TREATING RADIOACTIVELY CONTAMINATED MATERIAL; DECONTAMINATION ARRANGEMENTS THEREFOR
    • G21F9/00—Treating radioactively contaminated material; Decontamination arrangements therefor
    • G21F9/04—Treating liquids
    • G21F9/06—Processing
    • G21F9/12—Processing by absorption; by adsorption; by ion-exchange
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

Abstract

The invention relates to a modified MXene adsorption material, a preparation method and application thereof, wherein the modified MXene adsorption material is in particular a MXene/CuHCF composite material, and is in a loose and porous spongy structure, and CuHCF nano particles are uniformly dispersed on the surface of a MXene nano sheet. The MXene/CuHCF composite material is used for removing cesium in waste liquid, and even if a system contains various competitive cations, the composite material still has very good selectivity for cesium ions, and hardly adsorbs other metal ions; on the other hand, the MXene/CuHCF composite material also has good reusability.

Description

Modified MXene adsorption material and preparation method and application thereof
Technical Field
The invention belongs to the field of functional materials, and particularly relates to a modified MXene adsorption material, and a preparation method and application thereof.
Background
The nuclear energy is used as a clean energy source, can meet the increasing energy demand, is beneficial to reducing the emission of greenhouse gases and slows down the global climate change. However, the development of nuclear energy also has a negative impact on the environment, for example, the operation of nuclear power plants and the production of nuclear weapons accumulate considerable amounts of nuclear waste, without depletion of radionuclides 137 Cs. In one aspect of the present invention, 137 cs is a high-release radionuclide in spent fuel, is a strong beta/gamma radioactive source (0.514 MeV and 0.662 MeV), has a half-life of 30.17 years, and has high radioactivity and chemical toxicity. Once leaked into the environment and enter the human body for enrichment, various diseases can be caused. On the other hand, in the other hand, 137 cs can be used as a radiation source in agriculture, cancer treatment, coal exploration, etc., for preparing cesium atomic clocks and heat release elements. Thus, radioactive waste water/seawater 137 Cs are separated, extracted and converted into value-added products, which is important for human health, environmental protection and energy utilization.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a modified MXene adsorbing material which has good cesium ion adsorbing effect on waste liquid and can be used for multiple times.
The invention relates to a modified MXene adsorption material, in particular to a MXene/CuHCF composite material.
Furthermore, the modified MXene adsorption material is of a loose and porous spongy structure, and CuHCF nano particles are uniformly dispersed on the surface of the MXene nano sheet, so that the structure avoids stacking and agglomeration of the CuHCF nano particles, and the effective utilization rate of the CuHCF nano particles is greatly improved.
The invention relates to a preparation method of a modified MXene adsorption material, which comprises the following steps of firstly preparing Cu 2+ Is fixed on the surface of MXene by electrostatic action and chemical adsorption action, and then [ Fe (CN) is added 6 ] 3- And (3) growing CuHCF in situ to finally prepare the MXene/CuHCF composite material.
Further, the preparation method of the invention specifically comprises the following steps:
1) 0.1-0.2g MXene and 1-8 mmol CuCl 2 ·2H 2 Adding O into proper amount of mixed solution respectively, performing water bath ultrasonic treatment for 2-3 hours to obtain MXene mixed solution and CuCl 2 The temperature of the water bath ultrasonic wave is 20-30 ℃, the mixed solution is ethanol water solution, and the volume fraction of the ethanol water solution is 40-60%;
2) The CuCl obtained in step 1) is reacted with 2 Pouring the mixed solution into the MXene mixed solution, standing for 1.5-3h after water bath ultrasonic treatment for 1.5-3 hours, centrifugally collecting the precipitate, and re-dispersing the collected precipitate into a proper amount of the mixed solution to obtain a premix, wherein the temperature of the water bath ultrasonic treatment is 20-30 ℃;
3) Will be 0.4-2.5 mmol K 3 [Fe(CN) 6 ]Dissolving in the mixed solution to obtain K 3 [Fe(CN) 6 ]Mixing the solutions, and then adding K 3 [Fe(CN) 6 ]Pouring the mixed solution into the pre-mixed solution obtained in the step 2), stirring at room temperature for 12-14 h after ultrasonic treatment in water bath for 1-2h, aging for 4-6 h, centrifuging and collecting secondary precipitate, washing the secondary precipitate by deionized water and absolute ethyl alcohol, and freeze-drying to obtain the MXene/CuHCF composite material.
Further, in step 3) of the preparation method of the present invention, the secondary precipitation is washed with deionized water and absolute ethanol at least three times each.
The invention relates to an application of a modified MXene adsorbing material, which is used for adsorbing cesium.
Further, the removal rate of cesium ions in the solution by the MXene/CuHCF composite material is 64-95%.
Further, after the MXene/CuHCF composite material is subjected to four continuous adsorption-desorption, the removal rate of cesium ions is still higher than 85%.
Compared with the prior art, the invention has the following beneficial technical effects:
the modified MXene adsorption material is particularly an MXene/CuHCF composite material, and the porous sponge-like structure of the modified MXene/CuHCF composite material is beneficial to the diffusion and adsorption of cesium ions, and the MXene/CuHCF composite material has a good adsorption effect on cesium in waste liquid on one hand, and even if a system contains various competitive cations, the modified MXene/CuHCF composite material still has very good selectivity on cesium ions, and almost does not adsorb other metal ions; on the other hand, the paint also has good reusability.
The removal rate of cesium ions in the solution of the MXene/CuHCF composite material is 64% -95%, and after four continuous adsorption-desorption processes of the MXene/CuHCF composite material, the removal rate of cesium ions is still higher than 85%, wherein the adsorption conditions are as follows: c (C) 0 =100 ppm, ph=6.2, m/v=0.75 g/L, t=2 h, t=25 ℃. The CuHCF nano particles are uniformly dispersed on the surface of the MXene nano sheet, so that the stacking and agglomeration of the CuHCF nano particles can be avoided, and the effective utilization rate of the CuHCF is greatly improved. In addition, the preparation method of the modified MXene adsorbing material is simple to operate, the product generation condition is not harsh, and the method is suitable for popularization and application.
Drawings
FIG. 1 is a diagram of the microscopic morphology of a modified MXene adsorbent material according to the present invention;
FIG. 2 is a Fourier transform infrared spectrum of the adsorption material of examples 1-3 of the present invention, and comparative examples 1 and 2;
FIG. 3 is a graph showing the comparison of the adsorption performance of the adsorption materials of examples 1 to 3 of the present invention and comparative examples 1 and 2;
FIG. 4 is a graph showing the effect of the MXene adsorbent material of the present invention on cesium ions;
FIG. 5 is a graph showing the repeated adsorption effect of cesium ions by the MXene adsorbing material of the present invention.
Description of the embodiments
The present invention will be described in further detail with reference to specific examples.
Detailed Description
The modified MXene adsorption material is specifically an MXene/CuHCF composite material, as shown in figure 1, wherein the MXene/CuHCF composite material is of a loose porous sponge-like structure, and CuHCF nano particles are uniformly dispersed on the surface of an MXene nano sheet. As shown in FIG. 2, with MXeneThe ratio of MXene/CuHCF can be 2074 cm -1 A distinct telescopic vibration absorption peak of-C.ident.N-was observed, indicating that CuHCF has successfully composited with MXene.
The preparation method of the modified MXene adsorbing material comprises the steps of firstly preparing Cu from the following components 2+ Is fixed on the surface of MXene by electrostatic action and chemical adsorption action, and then [ Fe (CN) is added 6 ] 3- And (3) growing CuHCF in situ to finally prepare the MXene/CuHCF composite material.
The method specifically comprises the following steps:
0.1-0.2g MXene and 1-8 mmol CuCl 2 ·2H 2 Adding O into proper amount of mixed solution respectively, performing water bath ultrasonic treatment for 2-3 hours to obtain MXene mixed solution and CuCl 2 The temperature of the water bath ultrasonic wave is 20-30 ℃, the mixed solution is ethanol water solution, and the volume fraction of the ethanol water solution is 40-60%;
2) The CuCl obtained in step 1) is reacted with 2 Pouring the mixed solution into the MXene mixed solution, standing for 1.5-3h after water bath ultrasonic treatment for 1.5-3 hours, centrifugally collecting the precipitate, and re-dispersing the collected precipitate into a proper amount of the mixed solution to obtain a premix, wherein the temperature of the water bath ultrasonic treatment is 20-30 ℃;
3) Will be 0.4-2.5 mmol K 3 [Fe(CN) 6 ]Dissolving in the mixed solution to obtain K 3 [Fe(CN) 6 ]Mixing the solutions, and then adding K 3 [Fe(CN) 6 ]Pouring the mixed solution into the pre-mixed solution obtained in the step 2), stirring at room temperature for 12-14 h after ultrasonic treatment in water bath for 1-2h, aging for 4-6 h, centrifuging and collecting secondary precipitate, washing the secondary precipitate by deionized water and absolute ethyl alcohol, and freeze-drying to obtain the MXene/CuHCF composite material. Wherein the secondary precipitation is washed by deionized water and absolute ethyl alcohol for at least three times.
The invention relates to the use of the modified MXene adsorbing material, which is used for adsorbing cesium. The removal rate of cesium ions in the solution by the MXene/CuHCF composite material is 64% -95%. And after the MXene/CuHCF composite material is subjected to four continuous adsorption-desorption, the removal rate of cesium ions is still higher than 85%.
Example 1
The specific preparation method of the modified MXene adsorbing material comprises the following steps:
0.15g of MXene and 1.6 mmol of CuCl are reacted 2 ·2H 2 O is respectively added into 80mL of mixed solution to be treated by water bath ultrasonic treatment for 2.5 hours to obtain MXene mixed solution and CuCl 2 The temperature of the water bath ultrasonic wave is 25 ℃, the mixed solution is ethanol water solution, and the volume fraction of the ethanol water solution is 40-60%; in this example 1, the volume fraction of the aqueous ethanol solution was 50%.
In this example 1, the specific process for the preparation of MXene is as follows:
2.0 g LiF was added to 30 mL of 9mol/L HCl solution and stirred at room temperature for 15 min. Then 1.0. 1.0 g titanium aluminum carbide (Ti 3 AlC 2 ) The powder was slowly added to the above mixed solution, and in this example 1, 1.0. 1.0 g titanium aluminum carbide powder was added over 20 minutes, heated in a water bath, and reacted at 30℃for 24. 24 h. After the reaction is finished, transferring the mixed solution into a 50 mL centrifuge tube, centrifugally washing 3 times by using 1mol/L HCl solution, washing the supernatant liquid with deionized water for a plurality of times to be neutral, and collecting a clay-like black product at the bottom of the centrifuge tube. The black clay-like product was redispersed in deionized water, nitrogen sparged, sealed, water bath sonicated 1 h (bath temperature<35. DEG C), the supernatant was collected by centrifugation at 3500 rpm for 1. 1 h. Finally, the collected upper layer liquid is freeze-dried to finally prepare MXene (Ti 3 C 2 Tx)。
2) The CuCl obtained in step 1) is reacted with 2 Pouring the mixed solution into the MXene mixed solution rapidly, standing for 2 hours after water bath ultrasonic treatment for 2 hours, centrifugally collecting the precipitate, and redispersing the collected precipitate in 80mL of the mixed solution to obtain a premix, wherein the temperature of the water bath ultrasonic treatment is 28 ℃; in this example 1, the CuCl obtained in step 1) was prepared 2 The operation time for quickly pouring the mixed liquor into the MXene mixed liquor is not more than 30s.
3) Will be 0.4 mmol K 3 [Fe(CN) 6 ]Dissolving in 60mL of the mixed solution to obtain K 3 [Fe(CN) 6 ]Mixing the solutions, and then adding K 3 [Fe(CN) 6 ]The mixture was rapidly poured into the premix obtained in step 2), K being added in this example 1 3 [Fe(CN) 6 ]The mixed solution is quickly poured into the pre-mixed solution obtained in the step 2) for operation time not exceeding 30s, stirred at room temperature for 12 h after being subjected to water bath ultrasonic treatment for 1.5h, then placed at room temperature for 5h, and centrifuged to collect secondary precipitate, the secondary precipitate is alternately washed by deionized water and absolute ethyl alcohol, and is freeze-dried after being washed three times respectively, and the MXene/CuHCF composite material is obtained, namely the obtained adsorption material in the embodiment 1 is MXene/CuHCF-1.
Example 2
This example 2 differs from example 1 only in that 6 mmole of CuCl is used in said step 1) 2 ·2H 2 O is added into 80mL of mixed solution to obtain CuCl 2 The mixed liquid is prepared into a mixed liquid,
and 1.5mmol K in step 3) 3 [Fe(CN) 6 ]Dissolving in 60mL of the mixed solution to obtain K 3 [Fe(CN) 6 ]And (3) mixing the liquid.
The resulting adsorbent material in this example 2 was MXene/CuHCF-2.
Example 3
This example 3 differs from example 1 only in that 8 mmole of CuCl is used in said step 1) 2 ·2H 2 O is added into 80mL of mixed solution to obtain CuCl 2 The mixed liquid is prepared into a mixed liquid,
and 2.5mmol K in step 3) 3 [Fe(CN) 6 ]Dissolving in 60mL of the mixed solution to obtain K 3 [Fe(CN) 6 ]And (3) mixing the liquid.
The resulting adsorbent material in this example 3 was MXene/CuHCF-3.
Comparative example 1:
the adsorption material in the comparative example 1 is CuHCF, and the specific preparation process is as follows:
4 mmole of CuCl 2 ·2H 2 O is dispersed in the 60mL mixed solution, and the CuCl is obtained by water bath ultrasonic treatment of 1 h 2 A mixed solution; will be 1 mmolK 3 [Fe(CN) 6 ]Dissolving in 40 mL mixed solution, and performing water bath ultrasonic treatment on the solution 1 h to obtain K 3 [Fe(CN) 6 ]And (3) mixing the liquid. The mixed solution is ethanol water solution with the volume fraction of 50 percent. Will K 3 [Fe(CN) 6 ]The mixed solution is poured into CuCl quickly 2 In the mixed solution, after water bath ultrasonic treatment is carried out for 1 h, stirring is carried out at room temperature overnight for 12 h, and standing is carried out at room temperature for 5h, wherein the temperature of the water bath ultrasonic treatment is 25 ℃; and finally, centrifugally collecting the precipitate, washing the precipitate with absolute ethyl alcohol and deionized water for multiple times, and freeze-drying the precipitate to obtain the CuHCF.
Comparative example 2:
the adsorbent in this comparative example 2 was MXene, which was described in example 1.
The following adsorption experiments were performed on the adsorption materials of examples 1 to 3 and comparative examples 1 and 2 described above:
due to 137 The Cs are highly radioactive and for safety reasons, the experiment uses non-radioactive 133 Cs to simulate 137 Adsorption of Cs.
The experimental steps are as follows: 6mg of the adsorbent materials of examples 1 to 3 and comparative examples 1 and 2, i.e., MXene/CuHCF-1, MXene/CuHCF-2, MXene/CuHCF-3, cuHCF and MXene, were respectively added to 10 mL centrifuge tubes, and 8 mL cesium solution (C 0 =100 ppm, ph=6.2), m/v=0.75 g/L, after sealing the centrifuge tube was placed in a thermostatic shaker and shaken 2h at 298.15 k,250 rpm. After the adsorption equilibrium is reached, filtering to obtain a supernatant, diluting, and measuring the concentration of cesium ions in the solution by using an inductively coupled plasma-optical emission spectrometer (ICP-OES), wherein the removal rate of the MXene/CuHCF composite material to the cesium ions in the solution is 64-95%.
As can be seen in FIG. 3, under the above conditions, the MXene/CuHCF composite material has the best adsorption performance on cesium ions, which is superior to the removal of cesium ions by CuHCF and MXene. Whereas CuHCF and MXene have a cesium ion removal rate of 57.65% and 25.93%, respectively. And wherein the removal rate of cesium ions by MXene/CuHCF-2 described in example 2 can reach 93.31%.
In addition, selectivity is an important index for evaluating the performance of the adsorption material, and influences the application value of the adsorption material in actual wastewater treatment. The nuclear waste contains a plurality of small amount of radioactive ions and a large amount of conventional ions, such as Sr 2+ 、Ni 2+ And Al 3+ Etc. At the same time, consider that the radioactive waste liquid is moreIs an acidic system, thus, at 0.5 mol/L HNO 3 Under the system, the same concentration of competitive cations has little negative effect on cesium ion adsorption of the MXene/CuHCF composite material, and when the solid-to-liquid ratio is 1g/L, even if the system contains various competitive cations, the removal rate of the MXene/CuHCF composite material on cesium ions can reach more than 80 percent, and other metal ions are hardly adsorbed. As shown in FIG. 4, the removal rate of cesium ions by MXene/CuHCF-2 described in example 2 can reach 88.33%, with the specific condition C 0 =100 ppm, m/V=1 g/L, t=2 h, T=25 ℃, [HNO 3 ]=0.5 mol/L。
In [ Cs ] + ]The removal rate of cesium ions in the solution of the MXene/CuHCF composite material is higher than 90.00% under the adsorption conditions that the M/V is equal to 100 ppm, the m/V is equal to 0.75 g/L, the T is equal to 2h, and the T is equal to or higher than 25 ℃ and the pH is equal to or higher than 2.
After the adsorption is finished, the MXene/CuHCF composite material loaded with cesium ions is collected, washed for 3 times, and the cesium ion solution remained on the surface is removed. Then adding the solution into 0.5 mol/L KCl solution for desorption, oscillating 12 h, taking supernatant and measuring cesium ion concentration in the analysis solution. After the analyzed MXene/CuHCF composite material is washed for 3 times and then is used for adsorption again, the removal rate of cesium ions is still higher than 85% after four continuous adsorption-desorption processes. As shown in FIG. 5, the MXene/CuHCF-2 described in example 2 had a cesium ion removal rate of 86% after 4 consecutive adsorption-desorption.

Claims (8)

1. The modified MXene adsorbing material is characterized by being an MXene/CuHCF composite material.
2. The modified MXene adsorption material of claim 1, wherein the MXene/CuHCF composite material is a loose porous sponge like structure with CuHCF nanoparticles uniformly dispersed on the surface of the MXene nanoplatelet.
3. A process for preparing a modified MXene adsorbent material as claimed in claim 1 or 2, wherein the process comprises first introducing Cu 2+ Is fixed on the surface of MXene through electrostatic action and chemical adsorption action,then adding [ Fe (CN) 6 ] 3- Growing CuHCF in situ, finally obtaining the MXene/CuHCF composite material according to claim 1 or 2.
4. The method for preparing a modified MXene adsorption material according to claim 3, characterized in that it comprises the following steps:
1) 0.1-0.2g MXene and 1-8 mmol CuCl 2 ·2H 2 Adding O into proper amount of mixed solution respectively, performing water bath ultrasonic treatment for 2-3 hours to obtain MXene mixed solution and CuCl 2 The temperature of the water bath ultrasonic wave is 20-30 ℃, the mixed solution is ethanol water solution, and the volume fraction of the ethanol water solution is 40-60%;
2) The CuCl obtained in step 1) is reacted with 2 Pouring the mixed solution into the MXene mixed solution, standing for 1.5-3h after water bath ultrasonic treatment for 1.5-3 hours, centrifugally collecting the precipitate, and re-dispersing the collected precipitate into a proper amount of the mixed solution to obtain a premix, wherein the temperature of the water bath ultrasonic treatment is 20-30 ℃;
3) Will be 0.4-2.5 mmol K 3 [Fe(CN) 6 ]Dissolving in the mixed solution to obtain K 3 [Fe(CN) 6 ]Mixing the solutions, and then adding K 3 [Fe(CN) 6 ]Pouring the mixed solution into the pre-mixed solution obtained in the step 2), stirring at room temperature for 12-14 h after ultrasonic treatment in water bath for 1-2h, aging for 4-6 h, centrifuging and collecting secondary precipitate, washing the secondary precipitate by deionized water and absolute ethyl alcohol, and freeze-drying to obtain the MXene/CuHCF composite material.
5. The method according to claim 4, wherein the secondary precipitation in the step 3) is performed by washing with deionized water and absolute ethanol at least three times.
6. Use of a modified MXene adsorbent material according to any one of claims 1-5 for adsorbing cesium.
7. The use of the modified MXene adsorbent material of claim 6, wherein the MXene/CuHCF composite material has a removal rate of 64% to 95% for cesium ions in solution.
8. The use of a modified MXene adsorbent material according to claim 7, characterized in that the removal rate of cesium ions after four consecutive adsorption-desorption of the MXene/CuHCF composite material is still higher than 85%.
CN202310673095.2A 2023-06-08 2023-06-08 Modified MXene adsorption material and preparation method and application thereof Active CN116586029B (en)

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