CN113274893A - Preparation method of efficient two-dimensional nano material filter membrane - Google Patents
Preparation method of efficient two-dimensional nano material filter membrane Download PDFInfo
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- CN113274893A CN113274893A CN202110430377.0A CN202110430377A CN113274893A CN 113274893 A CN113274893 A CN 113274893A CN 202110430377 A CN202110430377 A CN 202110430377A CN 113274893 A CN113274893 A CN 113274893A
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- 239000002086 nanomaterial Substances 0.000 title claims abstract description 24
- 238000002360 preparation method Methods 0.000 title claims abstract description 15
- 239000012528 membrane Substances 0.000 title claims description 15
- 239000002135 nanosheet Substances 0.000 claims abstract description 79
- 229910052582 BN Inorganic materials 0.000 claims abstract description 52
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 claims abstract description 52
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 49
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 claims abstract description 49
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims abstract description 49
- 239000011812 mixed powder Substances 0.000 claims abstract description 39
- 229910021389 graphene Inorganic materials 0.000 claims abstract description 35
- 238000000498 ball milling Methods 0.000 claims abstract description 27
- 238000001914 filtration Methods 0.000 claims abstract description 21
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 claims abstract description 20
- 239000008103 glucose Substances 0.000 claims abstract description 20
- 238000000227 grinding Methods 0.000 claims abstract description 20
- 239000001913 cellulose Substances 0.000 claims abstract description 19
- 229920002678 cellulose Polymers 0.000 claims abstract description 19
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000002159 nanocrystal Substances 0.000 claims abstract description 15
- 239000008367 deionised water Substances 0.000 claims abstract description 14
- 229910021641 deionized water Inorganic materials 0.000 claims abstract description 14
- 229910002804 graphite Inorganic materials 0.000 claims abstract description 14
- 239000010439 graphite Substances 0.000 claims abstract description 14
- 238000000967 suction filtration Methods 0.000 claims abstract description 12
- 229920006284 nylon film Polymers 0.000 claims abstract description 8
- 239000002131 composite material Substances 0.000 claims abstract description 4
- 229910052593 corundum Inorganic materials 0.000 claims description 26
- 239000010431 corundum Substances 0.000 claims description 26
- 238000000034 method Methods 0.000 claims description 18
- 239000010408 film Substances 0.000 claims description 13
- 238000002604 ultrasonography Methods 0.000 claims description 13
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 8
- 238000005119 centrifugation Methods 0.000 claims description 8
- 238000001291 vacuum drying Methods 0.000 claims description 8
- 229910052786 argon Inorganic materials 0.000 claims description 4
- 238000000703 high-speed centrifugation Methods 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 2
- 239000010409 thin film Substances 0.000 claims description 2
- 239000000725 suspension Substances 0.000 abstract description 12
- 238000009210 therapy by ultrasound Methods 0.000 abstract description 4
- 239000000463 material Substances 0.000 abstract description 3
- 238000003828 vacuum filtration Methods 0.000 abstract description 2
- WQZGKKKJIJFFOK-VFUOTHLCSA-N beta-D-glucose Chemical compound OC[C@H]1O[C@@H](O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-VFUOTHLCSA-N 0.000 abstract 1
- 238000005406 washing Methods 0.000 abstract 1
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 description 6
- 239000004202 carbamide Substances 0.000 description 6
- 238000001035 drying Methods 0.000 description 5
- 239000000654 additive Substances 0.000 description 4
- 239000003344 environmental pollutant Substances 0.000 description 4
- 238000007306 functionalization reaction Methods 0.000 description 4
- 239000007788 liquid Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 238000000502 dialysis Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 239000002699 waste material Substances 0.000 description 3
- 239000004677 Nylon Substances 0.000 description 2
- 239000012752 auxiliary agent Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- IQFVPQOLBLOTPF-HKXUKFGYSA-L congo red Chemical compound [Na+].[Na+].C1=CC=CC2=C(N)C(/N=N/C3=CC=C(C=C3)C3=CC=C(C=C3)/N=N/C3=C(C4=CC=CC=C4C(=C3)S([O-])(=O)=O)N)=CC(S([O-])(=O)=O)=C21 IQFVPQOLBLOTPF-HKXUKFGYSA-L 0.000 description 2
- 239000010842 industrial wastewater Substances 0.000 description 2
- 230000014759 maintenance of location Effects 0.000 description 2
- 238000001000 micrograph Methods 0.000 description 2
- 238000001728 nano-filtration Methods 0.000 description 2
- 229920001778 nylon Polymers 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000002211 ultraviolet spectrum Methods 0.000 description 2
- 238000004065 wastewater treatment Methods 0.000 description 2
- 238000005303 weighing Methods 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000004964 aerogel Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000006228 supernatant Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
- B01D71/08—Polysaccharides
- B01D71/10—Cellulose; Modified cellulose
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D67/00—Processes specially adapted for manufacturing semi-permeable membranes for separation processes or apparatus
- B01D67/0079—Manufacture of membranes comprising organic and inorganic components
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/02—Inorganic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/02—Inorganic material
- B01D71/021—Carbon
Abstract
The invention belongs to the field of filter materials, and provides a preparation method of a high-efficiency two-dimensional nano material and cellulose nanocrystalline composite filter film, which comprises the steps of putting hexagonal boron nitride, graphite, molybdenum disulfide, glucose and grinding balls into a grinding tank for ball milling to obtain boron nitride nanosheet, graphene, molybdenum disulfide nanosheet and glucose mixed powder; performing ultrasonic treatment on the mixed powder in deionized water to form a suspension, performing suction filtration and washing to obtain mixed powder of boron nitride nanosheets, graphene and molybdenum disulfide nanosheets; ultrasonically treating the mixed powder in deionized water to form a suspension, centrifuging to remove more layers of nanosheets, and obtaining mixed powder of few layers of boron nitride nanosheets, graphene and molybdenum disulfide nanosheets; and adding the mixed powder into cellulose nanocrystals in a proper proportion, performing ultrasonic treatment in deionized water to form a suspension, and performing vacuum filtration to obtain the filtering film containing the boron nitride nanosheets, the graphene, the molybdenum disulfide nanosheets and the cellulose nanocrystals on the surface of the nylon film.
Description
Technical Field
The invention relates to the technical field of filter membranes, in particular to a two-dimensional nano material filter membrane, and specifically relates to a preparation method of a high-efficiency two-dimensional nano material and cellulose nanocrystal composite filter membrane.
Background
With the rapid development of industry, the pollution of industrial wastewater is increasingly serious. The industrial dye wastewater has the characteristics of high chromaticity, complex components, strong toxicity, stable chemical properties, difficult biochemical degradation and the like, so that the industrial wastewater treatment faces huge challenges. In order to solve the problem of wastewater treatment, some two-dimensional nano materials such as boron nitride nanosheets, graphene and molybdenum disulfide nanosheets and the like are widely applied due to the outstanding advantages of good chemical stability, high strength, high temperature oxidation resistance, large specific surface area, low cost, easiness in cyclic utilization and the like. However, the two-dimensional nano material without the added cellulose nanocrystals has poor water solubility, so that the preparation of the two-dimensional nano material filter film by a suction filtration method is greatly limited. At present, two-dimensional nanomaterials are functionalized by mainly using urea as a ball milling aid and a functionalization aid, for example, in the literature, "Boron nitride colloidal solutions, ultra light aerogels and free standing membranes through one-step activation and functionalization" (2015) nat. Commun 4, 1563, Lei of the university of Duken, Australia, and the like, using hexagonal Boron nitride as a raw material, using urea as a ball milling aid and a functionalization aid, ball milling and stripping for 8 hours, and then dialyzing for 2 weeks by using a dialysis method to remove urea, thereby preparing amino-functionalized Boron nitride nanosheets, and then preparing a filter membrane by a suction filtration method. However, because dialysis for 2 weeks is required to remove urea, the time required is quite long, and therefore, the preparation efficiency is low and the cost is high. And because urea has pollution to the environment, the urea waste liquid after dialysis still needs to be subjected to pollution-free treatment.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: solves the technical problems of long functionalization time, low efficiency and high cost of the traditional two-dimensional nano material.
The invention provides a preparation method of a high-efficiency two-dimensional nano material and cellulose nanocrystalline composite filtering film, which comprises the following steps:
s1, placing the hexagonal boron nitride, the graphite, the molybdenum disulfide and the corundum grinding balls into a corundum ball-milling tank, wherein the two kinds of corundum grinding balls are provided, the weight-to-diameter ratio of the corundum grinding balls is 10:1, the average particle size of the hexagonal boron nitride, the graphite and the molybdenum disulfide is 3-10 microns, the mass ratio of the hexagonal boron nitride, the graphite and the molybdenum disulfide as a whole to the corundum grinding balls is 1:1:1, the mass ratio of the hexagonal boron nitride, the graphite and the molybdenum disulfide as a whole to the glucose is 22:1-50:1, and the mass ratio of the hexagonal boron nitride, the graphite and the molybdenum disulfide as a whole to the glucose is 1: 5;
s2, performing rotary ball milling on the corundum ball milling tank under the protection of argon to obtain mixed powder of boron nitride nanosheets, graphene, molybdenum disulfide nanosheets and glucose;
s3, dispersing the mixed powder of the boron nitride nanosheets, the graphene and the molybdenum disulfide nanosheets and the glucose into deionized water by ultrasonic, removing the glucose in the mixed powder by vacuum suction filtration, and drying to obtain mixed powder of the boron nitride nanosheets, the graphene and the molybdenum disulfide nanosheets as shown in an electron microscope image of FIG. 2;
s4, dispersing the mixed powder of the boron nitride nanosheets, the graphene and the molybdenum disulfide nanosheets into deionized water through ultrasound, then removing the precipitated thicker nanosheets (about 100 layers in experimental tests) through high-speed centrifugation, wherein the ultrasound time is 1-3h, the centrifugation speed is 1000-3000r/min, the centrifugation time is 10-50min, and collecting supernatant liquid of the upper layer;
s5, carrying out vacuum drying on the mixed powder of the boron nitride nanosheets, the graphene and molybdenum disulfide nanosheets from which more than 100 layers of nanosheets are removed at the temperature of 80 ℃;
s6, adding cellulose nanocrystals in a proper proportion into mixed powder containing less than 100 layers of boron nitride nanosheets, graphene and molybdenum disulfide nanosheets, dispersing the mixed powder into deionized water through ultrasound for 1-3 hours, and preparing a film containing the boron nitride nanosheets, the graphene, the molybdenum disulfide and the cellulose nanocrystals on the surface of a nylon film with the aperture of 0.2 microns through a vacuum suction filtration method, as shown in figure 3.
2. The preparation method of the high-efficiency two-dimensional nano-material filter membrane according to claim 1, which is characterized in that: a filter paper having a pore size of 0.2 μm was placed on a filter flask by vacuum filtration, and the lower part of the filter flask was evacuated by a vacuum pump to form a pressure difference with the upper part, thereby carrying out filtration.
The nano-sheet is a lamellar material, and a vacuum drying oven is selected for vacuum drying; the invention has the beneficial effects that: 1. the two-dimensional nano material is prepared by using a ball milling method, and glucose is added as a ball milling aid and a functionalized aid, so that the preparation method is green and environment-friendly, does not generate waste liquid, and is simple in operation process; 2. the two-dimensional nano material is prepared by taking cellulose nanocrystals as additives and adopting a filtering method. Has the characteristics of less time consumption, good hydrophilicity, simple equipment and the like. 3. The cellulose nanocrystals are used as additives, and the vacuum suction filtration method is adopted to prepare the two-dimensional nanofiltration membrane on the nylon membrane, so that the method has the characteristics of simple operation, easy regulation and control of membrane thickness and high filtration efficiency. 4. As the retention rates of the two-dimensional nano materials to different pollutants are different, the invention adopts the boron nitride nanosheet, the graphene and the molybdenum disulfide nanosheet, and three two-dimensional nano materials as raw materials to prepare the filtering film, so that the filtering film can efficiently retain various pollutants.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a flow chart of the preparation of the invention;
FIG. 2 is an electron microscope image of boron nitride nanosheets, graphene and molybdenum disulfide nanosheets;
FIG. 3 is a photograph of (a) a filter film and (b) a folded photograph of the filter film;
FIG. 4 is the UV spectrum of a 12mg/ml Congo red solution before and after filtration.
Detailed Description
The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.
The first embodiment is as follows:
the invention relates to a preparation method of a high-efficiency two-dimensional nano material filter film, which comprises the following steps:
s1, placing the hexagonal boron nitride, the graphite, the molybdenum disulfide and the corundum grinding balls into a corundum ball-milling tank, wherein the corundum grinding balls are two, and the two types of corundum grinding balls comprise 150g of corundum grinding balls with the diameter of 10mm and 15g of corundum grinding balls with the diameter of 1mm, the total weight of the hexagonal boron nitride, the graphite and the molybdenum disulfide is 3g, the average particle size is 5-9 mu m, and the mass ratio is 1:1: 1;
s2, carrying out rotary ball milling on the corundum ball milling tank under the protection of argon to obtain mixed powder of boron nitride nanosheets, graphene, molybdenum disulfide nanosheets and glucose, wherein the ball milling speed is 300r/min, and the ball milling time is 6 h;
s3, weighing 2g of mixed powder obtained by ball milling in the step S2, putting the mixed powder into 1000ml of deionized water, and then carrying out ultrasonic treatment for 2 hours to prepare well-dispersed suspension;
s4, placing water system filter paper with the aperture of 0.2 mu m on a filtering flask, clamping the water system filter paper with a matched clamp, slowly pouring the suspension prepared by the ultrasonic wave in the S3 into the filtering flask along the cup wall, opening a vacuum pump for filtering, sequentially filtering for 4 times, cleaning glucose to remove the glucose in the mixed powder,
s5, drying in a vacuum drying oven at the temperature of 80 ℃ to obtain mixed powder of boron nitride nanosheets, graphene and molybdenum disulfide nanosheets;
s6, dispersing 2g of mixed powder of boron nitride nanosheets, graphene and molybdenum disulfide nanosheets into 200ml of deionized water through ultrasound, then performing ultrasound for 2h to prepare well-dispersed suspension, then putting the suspension into a centrifuge for high-speed centrifugation, setting the centrifugation speed to 2000r/min, setting the centrifugation time to 50min, and removing more than 100 layers of nanosheets;
s7, drying the boron nitride nanosheet with more than 100 layers of nanosheets removed, the mixed powder of graphene and molybdenum disulfide nanosheets in a vacuum drying oven at the temperature of 80 ℃;
s8, adding 1mg of cellulose nanocrystals into 5mg of mixed powder containing boron nitride nanosheets, graphene and molybdenum disulfide nanosheets with the thickness less than 100, dispersing the mixed powder into 30ml of deionized water through ultrasound for 3 hours to obtain well-dispersed suspension, and then preparing nanosheets containing the boron nitride nanosheets, the graphene and the molybdenum disulfide and a cellulose nanocrystalline thin film on the surface of a nylon film through a vacuum suction filtration method (refer to step S4), wherein the aperture of the nylon film is 0.2 mu m; the interception rate of the Congo red of 12mg/ml is about 96 percent, as shown by the ultraviolet spectrum of figure 4.
Example two:
the invention relates to a preparation method of a high-efficiency two-dimensional nano material filter film, which comprises the following steps:
s1, placing the hexagonal boron nitride, the graphite, the molybdenum disulfide and the corundum grinding balls into a corundum ball-milling tank, wherein the corundum grinding balls are two, and the two types of corundum grinding balls comprise 200g of corundum grinding balls with the diameter of 10mm and 20g of corundum grinding balls with the diameter of 1mm, the total weight of the hexagonal boron nitride, the graphite and the molybdenum disulfide is 4g, the average particle size is 3-8 mu m, and the mass ratio is 1:1: 1;
s2, performing rotary ball milling on the corundum ball milling tank under the protection of argon to obtain mixed powder of boron nitride nanosheets, graphene, molybdenum disulfide nanosheets and glucose, wherein the ball milling speed is 200r/min, and the ball milling time is 8 hours;
s3, weighing 1g of mixed powder obtained by ball milling in the step S2, putting the mixed powder into 800ml of deionized water, and then carrying out ultrasonic treatment for 3h to prepare well-dispersed suspension;
s4, placing water system filter paper with the aperture of 0.2 mu m on a filtering flask, clamping the water system filter paper with a matched clamp, slowly pouring the suspension prepared by the ultrasonic wave in the S3 into the filtering flask along the cup wall, opening a vacuum pump for filtering, sequentially filtering for 4 times, cleaning glucose to remove the glucose in the mixed powder,
s5, drying in a vacuum drying oven at the temperature of 80 ℃ to obtain mixed powder of boron nitride nanosheets, graphene and molybdenum disulfide nanosheets;
s6, dispersing 1g of mixed powder of boron nitride nanosheets, graphene and molybdenum disulfide nanosheets into 100ml of deionized water through ultrasound, then performing ultrasound for 3h to prepare well-dispersed suspension, then putting the suspension into a centrifuge for high-speed centrifugation, setting the centrifugation speed at 1800r/min and the centrifugation time at 30min, and removing more than 100 layers of nanosheets;
s7, drying the boron nitride nanosheet with more than 100 layers of nanosheets removed, the mixed powder of graphene and molybdenum disulfide nanosheets in a vacuum drying oven at the temperature of 80 ℃;
s8, adding 2mg of cellulose nanocrystals into 8mg of mixed powder containing boron nitride nanosheets, graphene and molybdenum disulfide nanosheets with the thickness less than 100 layers, and then preparing the nanosheets containing the boron nitride nanosheets, the graphene and the molybdenum disulfide and a cellulose nanocrystal film on the surface of the nylon film by a vacuum suction filtration method (refer to step S4), wherein the aperture of the nylon film is 0.2 microns.
The nano-sheet is a lamellar material; by integrating the first embodiment and the second embodiment, the beneficial effects of the invention are as follows: 1. the two-dimensional nano material is prepared by using a ball milling method, a ball milling auxiliary agent and a functionalized auxiliary agent are not needed, so that the preparation method is green and environment-friendly, does not generate waste liquid, and is simple in operation process; 2. the two-dimensional nano material prepared by taking the cellulose nanocrystals as the additive and adopting the ball milling-filtering method has the characteristics of less time consumption, good hydrophilicity, simple equipment and the like. 3. The cellulose nanocrystals are used as additives, and the vacuum suction filtration method is adopted to prepare the two-dimensional nanofiltration membrane on the nylon membrane, so that the method has the characteristics of simple operation, easy regulation and control of membrane thickness and high filtration efficiency. 4. As the retention rates of the two-dimensional nano materials to different pollutants are different, the invention adopts the boron nitride nanosheet, the graphene and the molybdenum disulfide nanosheet, and three two-dimensional nano materials as raw materials to prepare the filtering film, so that the filtering film can efficiently retain various pollutants.
In light of the foregoing description of the preferred embodiment of the present invention, many modifications and variations will be apparent to those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (2)
1. A preparation method of a high-efficiency two-dimensional nano material and cellulose nanocrystalline composite filter film is characterized by comprising the following steps:
s1, placing the hexagonal boron nitride, the graphite, the molybdenum disulfide, the glucose and the corundum grinding balls into a corundum ball-milling tank, wherein the two kinds of corundum grinding balls are provided, the weight-to-diameter ratio of the two kinds of corundum grinding balls is 10:1, the average particle size of the hexagonal boron nitride, the graphite and the molybdenum disulfide is 3-10 microns, the mass ratio of the hexagonal boron nitride, the graphite and the molybdenum disulfide as a whole to the corundum grinding balls is 1:1:1, the mass ratio of the hexagonal boron nitride, the graphite and the molybdenum disulfide to the glucose is 22:1-50:1, and the mass ratio of the hexagonal boron nitride, the graphene and the molybdenum disulfide to the glucose is 1: 5;
s2, performing rotary ball milling on the corundum ball milling tank under the protection of argon to obtain mixed powder of boron nitride nanosheets, graphene, molybdenum disulfide nanosheets and glucose, wherein the ball milling speed is 200-;
s3, dispersing the mixed powder of the boron nitride nanosheets, the graphene and the molybdenum disulfide nanosheets and glucose into deionized water through ultrasound, and removing the glucose in the mixed powder through vacuum suction filtration to obtain mixed powder of the boron nitride nanosheets, the graphene and the molybdenum disulfide nanosheets;
s4, dispersing the mixed powder of boron nitride nanosheets, graphene and molybdenum disulfide nanosheets into deionized water through ultrasound, and then removing more than 100 layers of nanosheets through high-speed centrifugation, wherein the ultrasound time is 1-3h, the centrifugation speed is 1000-3000r/min, and the centrifugation time is 10-50 min;
s5, carrying out vacuum drying on the mixed powder of the boron nitride nanosheets, the graphene and molybdenum disulfide nanosheets from which more than 100 layers of nanosheets are removed at the temperature of 80 ℃;
s6, adding cellulose nanocrystals in a proper proportion into less than 100 layers of mixed powder containing boron nitride nanosheets, graphene and molybdenum disulfide nanosheets, dispersing the mixed powder into deionized water through ultrasound, and then preparing the nanosheets containing the boron nitride nanosheets, the graphene and the molybdenum disulfide and the cellulose nanocrystal thin film on the surface of the nylon film through a vacuum suction filtration method, wherein the ultrasound duration is 1-3h, and the aperture of the nylon film is 0.2 mu m.
2. The preparation method of the high-efficiency two-dimensional nano-material filter membrane according to claim 1, which is characterized in that: the vacuum suction filtration method comprises the following steps: a filter paper having a pore size of 0.2 μm was placed on the filter flask, and the lower part of the filter flask was evacuated by a vacuum pump to form a pressure difference with the upper part, thereby carrying out filtration.
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| CN112662449A (en) * | 2020-12-23 | 2021-04-16 | 陕西科技大学 | High-dispersion amorphous carbon coated hexagonal boron nitride nanosheet and preparation method thereof |
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| CN113773664A (en) * | 2021-09-18 | 2021-12-10 | 福建农林大学 | Preparation and application of wood nano-cellulose/graphite flake layer material |
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