WO2021072818A1 - Procédé de préparation et application d'hydrogel conducteur à base de tungstate-graphène de bismuth - Google Patents

Procédé de préparation et application d'hydrogel conducteur à base de tungstate-graphène de bismuth Download PDF

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WO2021072818A1
WO2021072818A1 PCT/CN2019/115252 CN2019115252W WO2021072818A1 WO 2021072818 A1 WO2021072818 A1 WO 2021072818A1 CN 2019115252 W CN2019115252 W CN 2019115252W WO 2021072818 A1 WO2021072818 A1 WO 2021072818A1
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graphene
preparation
bismuth tungstate
tungstate
bismuth
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刘璞
魏子晔
李振邦
王建兴
刘才超
杨国伟
石磊
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中山大学
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J3/00—Processes of treating or compounding macromolecular substances
    • C08J3/02—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques
    • C08J3/03—Making solutions, dispersions, lattices or gels by other methods than by solution, emulsion or suspension polymerisation techniques in aqueous media
    • C08J3/075—Macromolecular gels
    • 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
    • B01J23/00—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00
    • B01J23/16—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of arsenic, antimony, bismuth, vanadium, niobium, tantalum, polonium, chromium, molybdenum, tungsten, manganese, technetium or rhenium
    • B01J23/24—Chromium, molybdenum or tungsten
    • B01J23/31—Chromium, molybdenum or tungsten combined with bismuth
    • 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
    • B01J31/00—Catalysts comprising hydrides, coordination complexes or organic compounds
    • B01J31/26—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24
    • B01J31/34—Catalysts comprising hydrides, coordination complexes or organic compounds containing in addition, inorganic metal compounds not provided for in groups B01J31/02 - B01J31/24 of chromium, molybdenum or tungsten
    • B01J35/23—
    • B01J35/33—
    • B01J35/61—
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
    • C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
    • C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
    • C08F220/52—Amides or imides
    • C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
    • C08F220/56—Acrylamide; Methacrylamide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G73/00—Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups C08G12/00 - C08G71/00
    • C08G73/02—Polyamines
    • C08G73/026—Wholly aromatic polyamines
    • C08G73/0266—Polyanilines or derivatives thereof
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B1/00—Electrolytic production of inorganic compounds or non-metals
    • C25B1/01—Products
    • C25B1/02—Hydrogen or oxygen
    • C25B1/04—Hydrogen or oxygen by electrolysis of water
    • C—CHEMISTRY; METALLURGY
    • C25—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES; APPARATUS THEREFOR
    • C25B—ELECTROLYTIC OR ELECTROPHORETIC PROCESSES FOR THE PRODUCTION OF COMPOUNDS OR NON-METALS; APPARATUS THEREFOR
    • C25B11/00—Electrodes; Manufacture thereof not otherwise provided for
    • C25B11/04—Electrodes; Manufacture thereof not otherwise provided for characterised by the material
    • C25B11/051—Electrodes formed of electrocatalysts on a substrate or carrier
    • C25B11/073—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material
    • C25B11/091—Electrodes formed of electrocatalysts on a substrate or carrier characterised by the electrocatalyst material consisting of at least one catalytic element and at least one catalytic compound; consisting of two or more catalytic elements or catalytic compounds
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2379/00—Characterised by the use of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing nitrogen with or without oxygen, or carbon only, not provided for in groups C08J2361/00 - C08J2377/00
    • C08J2379/02—Polyamines
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2433/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C08J2433/24—Homopolymers or copolymers of amides or imides
    • C08J2433/26—Homopolymers or copolymers of acrylamide or methacrylamide
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/04—Carbon
    • C08K3/042—Graphene or derivatives, e.g. graphene oxides
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/24—Acids; Salts thereof
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis

Definitions

  • This application belongs to the technical field of electrolysis catalyst research and development, and in particular relates to a preparation method and application of bismuth tungstate-graphene-conductive hydrogel.
  • Renewable energy includes solar energy, wind energy, hydrogen energy, and biomass energy.
  • Hydrogen energy is a clean and renewable dye.
  • the combustion of hydrogen can provide three times the energy compared to ordinary fossil fuels.
  • the product is pollution-free, has zero pollutant emissions, and can be recycled. Since the water electrolysis technology was first reported, this method has received extensive attention and research. Part of the oversupply of electricity can be used to split water to produce hydrogen, which can be used as a direct supply of primary energy, and hydrogen can also be stored for secondary energy applications such as fuel cells.
  • the cathode hydrogen evolution reaction (HER, hydrogen evolution reaction) of electrolyzed water has a high kinetic potential.
  • the traditional HER reaction needs to be carried out at a higher overpotential and consumes too much electrical energy, so it is necessary to find a suitable one.
  • the catalyst reduces the electric potential and improves the efficiency of hydrogen precipitation.
  • Platinum-based precious metals are the most ideal electrocatalysts for HER, but platinum-based materials are limited by their high price and low reserves, and there are relatively large limitations in their applications.
  • the layered structure of bismuth tungstate (Bi 2 WO 6 ) can promote the separation of photogenerated electrons and holes, it is also conducive to the transport of ions between layers, and has good physical and chemical properties, such as iron Electricity, pyroelectricity, photodegradation, piezoelectricity, nonlinear dielectric polarization and luminescence properties, etc.
  • a single Bi 2 WO 6 has shortcomings in photodegradation, its visible light response range is limited, and the recombination rate of photogenerated electrons and holes is relatively high. At the same time, after the electrolysis reaction is completed, the catalyst cannot be recovered, resulting in waste of the catalyst and environmental pollution.
  • the present application provides a preparation method and application of bismuth tungstate-graphene-conductive hydrogel, which is used to solve the problems in the prior art for the cathodic hydrogen evolution reaction of electrolyzed water and the degradation of environmental pollution.
  • the catalyst has the technical defects of poor catalytic performance and unrecoverable.
  • This application provides a preparation method of bismuth tungstate-graphene-conductive hydrogel, the preparation method is:
  • Step 1 Hydrothermal reaction to prepare bismuth tungstate: sodium tungstate, bismuth nitrate and CTAB are mixed and dissolved in water, stirred and then hydrothermally reacted. After the hydrothermal reaction is completed, they are washed and dried sequentially to obtain lamellar tungstic acid bismuth;
  • Step 2 Ultrasonic peeling: the lamellae are dissolved and then ultrasonically peeled to obtain dispersed two-dimensional bismuth tungstate nanosheets;
  • Step 3 Preparation of graphene quantum dots: After the graphene is dissolved, laser processing is performed to obtain graphene quantum dots;
  • Step 4 Laser ablation composite: the dispersed two-dimensional bismuth tungstate nanosheets are mixed with the graphene quantum dots to perform laser ablation composite to obtain graphene-bismuth tungstate;
  • Step 5 Cross-linking polymerization: graphene-bismuth tungstate, acrylamide solution, cross-linking agent and initiator are mixed to polymerize to obtain the fifth product;
  • Step 6 Aniline immersion: the fifth product is mixed with the aniline solution, and the sixth product is obtained by standing still;
  • Step 7 Secondary polymerization: The sixth product is mixed with the initiator solution and polymerized to obtain a conductive hydrogel product of bismuth tungstate-graphene-polyacrylamide-polyaniline.
  • the feed ratio of bismuth tungstate, graphene, acrylamide and aniline is (0.01 ⁇ 0.05):(0.003 ⁇ 0.015):(1 ⁇ 5):(0.1 ⁇ 0.5) in mole parts.
  • the preparation method further includes: removing impurities;
  • the method for removing impurities is: the crude conductive hydrogel obtained in step 7 is allowed to stand still in water to obtain a pure product.
  • the temperature of the hydrothermal reaction is 120-160°C, and the time of the hydrothermal reaction is 18-24h;
  • the frequency of the ultrasonic dispersion is 20-25 KHz, and the time of the ultrasonic dispersion is 1 to 3 h.
  • the processing time of the laser treatment is 1 to 3 hours
  • the laser wavelength of the laser treatment is 10 to 760 nm
  • the pulse frequency of the laser treatment is 10 to 100 Hz
  • the single pulse of the laser treatment The energy is 200 ⁇ 500mJ.
  • the action time of the laser ablation recombination is 30-60 min
  • the laser wavelength of the laser ablation recombination is 10 to 760 nm
  • the pulse frequency of the laser ablation recombination is 10-100 Hz
  • the laser ablation recombination The combined single pulse energy is 20-50mJ.
  • the concentration of the acrylamide solution is 1 to 5 mol/L, and the solvent of the acrylamide solution is deionized water;
  • the concentration of the aniline solution is 0.3 to 1.5 mol/L, and the solvent of the aniline solution is selected from any one or more of hydrochloric acid and deionized water;
  • step 7 the molar ratio of the initiator to acrylamide is 1: (200-600).
  • the initiator is selected from any one or more of ammonium persulfate, potassium persulfate and N,N,N′,N′-tetramethylethylenediamine;
  • the crosslinking agent is selected from any one or more of N,N-methylenebisacrylamide, azobisisobutyronitrile and N,N'-diisopropylbisacrylamide.
  • the polymerization method is: water bath/oil bath heating polymerization at 60-80°C for 10-30 minutes;
  • step 6 the standing temperature is room temperature, and the standing time is 6-12h;
  • step 7 the polymerization method is: standing for polymerization at room temperature for 4 to 8 hours.
  • the application also provides an application of the product obtained by the preparation method described in any one of the above in the electrolysis catalyst.
  • this application provides a method for preparing bismuth tungstate-graphene-conductive hydrogel, which includes: preparing bismuth tungstate by hydrothermal reaction, ultrasonic peeling, preparing graphene quantum dots, laser ablation composite, cross-linking Union polymerization, aniline immersion and secondary polymerization.
  • the application also provides an application of the product obtained by the above preparation method in an electrolysis catalyst.
  • graphene quantum dots are introduced to increase active sites of bismuth tungstate to improve electrocatalytic performance; further, combined with conductive gel, based on the electrical properties and three-dimensional structure of conductive gel, The bismuth tungstate-graphene is further uniformly dispersed to prevent agglomeration of the catalyst, increase the catalytic area of the catalyst, and the gel is easy to recover after the catalysis is completed.
  • the preparation method and application of bismuth tungstate-graphene-conductive hydrogel provided in the present application solve the problem of poor catalytic performance and unrecyclable catalysts used in the cathode hydrogen evolution reaction of electrolyzed water in the prior art. Technical flaws.
  • Fig. 1 is a schematic flow chart of a method for preparing bismuth tungstate-graphene-conductive hydrogel provided by the present application
  • Example 2 is a schematic diagram of the result of linear scanning the volt-ampere curve in Example 4.
  • Example 3 is a schematic diagram of the degradation efficiency of the organic dye Rh B by the prepared bismuth tungstate-graphene-conductive hydrogel and the reference substance in Example 5;
  • Figure 1 is designated as the abstract drawing.
  • This application provides a method for preparing bismuth tungstate-graphene-conductive hydrogel and its application, which is used to solve the problem of poor catalytic performance and unrecyclable catalyst used in the cathode hydrogen evolution reaction of electrolyzed water in the prior art. Of technical defects.
  • Step 1 Weigh out 1mmol of sodium tungstate (Na 2 WO 4 ⁇ 2H 2 O), 2mmol of bismuth nitrate (Bi(NO 3 ) 3 ⁇ 5H 2 O) and 0.05g of CTAB, mix them and dissolve in 80ml of deionized water at 60°C , Stir at 500r/min for 30min until uniform, transfer to a hydrothermal kettle for hydrothermal reaction, wherein the temperature of the hydrothermal reaction is 120°C, and the time of the hydrothermal reaction is 20h. After the hydrothermal reaction is completed, the lamellar bismuth tungstate is obtained by successive washing and drying; wherein the washing method is washing with water and ethanol 3 times, and the drying method is: drying at 60°C for 10 hours.
  • Step 2 Take 400 mg of bismuth tungstate obtained in the previous step, dissolve it in 200 ml of deionized water, and ultrasonically peel off after dissolution to obtain dispersed two-dimensional bismuth tungstate nanosheets; wherein the frequency of ultrasonic dispersion is 20KHz, and the time of ultrasonic dispersion For 1h.
  • Step 3 Weigh 5mg of graphene and dissolve it in 10ml of deionized water, and disperse the graphene by ultrasonic dispersion at 53KHz for 10min to fully dissolve the graphene; after dissolution, perform laser treatment with a wavelength of 532nm, a pulse frequency of 10Hz, and a single pulse energy of 200mJ for 3h , Get graphene quantum dots.
  • Step 4 Take 5ml of the dispersed two-dimensional bismuth tungstate nanosheets obtained in step 2 and mix with the graphene quantum dot solution obtained in step 3.
  • the ultrasonic dispersion method can be used to make the two fully mixed .
  • the mass ratio of the dispersed two-dimensional bismuth tungstate nanosheets to the graphene quantum dots is 2:1.
  • Step 5 Prepare 1mol/L acrylamide (AM) solution, then add graphene-bismuth tungstate, crosslinking agent and initiator (0.05mol/L) to mix uniformly, polymerize at 60°C water bath temperature for 30min, and get transparent The jelly-like hydrogel is the fifth product.
  • the crosslinking agent is N,N-methylenebisacrylamide
  • the initiator is ammonium persulfate; the molar feed ratio of acrylamide, crosslinking agent and initiator is 1:0.005:0.05.
  • Step 6 The fifth product is immersed in a hydrochloric acid (aniline concentration of 1.5 mol/L) solution containing aniline (ANI) and allowed to stand at room temperature for 6 hours to allow the aniline monomer to enter the fifth product, which is the sixth product.
  • a hydrochloric acid aniline concentration of 1.5 mol/L
  • aniline aniline
  • Step 7 The sixth product is immersed in the initiator aqueous solution, and the aniline monomer is polymerized at room temperature for 4 hours to form the crude bismuth tungstate-graphene-PAM-PANI conductive hydrogel, and the obtained crude conductive hydrogel is placed in a large amount The oligomer and unreacted aniline monomer are removed from the deionized water to obtain a pure polyacrylamide-polyaniline composite hydrogel product.
  • the initiator is ammonium persulfate; the molar feed ratio of the initiator to the aniline in step two is 1:1.
  • the feed ratio of bismuth tungstate, graphene, acrylamide, and aniline is 0.03:0.003:5:0.1 in terms of parts by mole.
  • Step 1 Weigh out 1mmol of sodium tungstate (Na 2 WO 4 ⁇ 2H 2 O), 2mmol of bismuth nitrate (Bi(NO 3 ) 3 ⁇ 5H 2 O) and 0.05g of CTAB, mix them and dissolve in 80ml of deionized water at 70°C , Stir at 800r/min for 10 minutes until uniform, transfer to a hydrothermal kettle for hydrothermal reaction, where the temperature of the hydrothermal reaction is 130°C, and the time of the hydrothermal reaction is 24h. After the hydrothermal reaction is completed, the lamellar bismuth tungstate is obtained by successive washing and drying; wherein the washing method is washing with water and ethanol 3 times, and the drying method is: drying at 60°C for 10 hours.
  • Step 2 Take 400 mg of the lamella bismuth tungstate obtained in the previous step, dissolve it in 200ml deionized water, and ultrasonically peel off after dissolution to obtain dispersed two-dimensional bismuth tungstate nanosheets; wherein the frequency of ultrasonic dispersion is 25KHz, and the time of ultrasonic dispersion For 2h.
  • Step 3 Weigh 10mg of graphene and dissolve it in 10ml of deionized water, and disperse the graphene by ultrasonic dispersion at 53KHz for 10min to fully dissolve the graphene; after dissolution, laser treatment with a wavelength of 10nm, a pulse frequency of 100Hz, and a single pulse energy of 300mJ for 2h , Get graphene quantum dots.
  • Step 4 Take 5ml of the dispersed two-dimensional bismuth tungstate nanosheets obtained in step 2 and mix with the graphene quantum dot solution obtained in step 3.
  • the ultrasonic dispersion method can be used to make the two fully mixed .
  • the mass ratio of the dispersed two-dimensional bismuth tungstate nanosheets to the graphene quantum dots is 1:1.
  • Step 5 Prepare 3mol/L acrylamide (AM) solution, then add graphene-bismuth tungstate, cross-linking agent and initiator (0.05mol/L) to mix uniformly, polymerize at 60°C water bath temperature for 30min, get transparent
  • the jelly-like hydrogel is the fifth product.
  • the crosslinking agent is azobisisobutyl cyanide
  • the initiator is potassium persulfate; the molar feed ratio of acrylamide, crosslinking agent and initiator is 1:0.01:0.1.
  • Step 6 The fifth product is immersed in a hydrochloric acid (aniline concentration of 0.3 mol/L) solution containing aniline (ANI), and allowed to stand at room temperature for 10 hours to allow the aniline monomer to enter the fifth product, which is the sixth product.
  • a hydrochloric acid aniline concentration of 0.3 mol/L
  • aniline aniline
  • Step 7 The sixth product is immersed in the initiator aqueous solution, and the aniline monomer is polymerized at room temperature for 6 hours to form the crude bismuth tungstate-graphene-PAM-PANI conductive hydrogel, and the obtained crude conductive hydrogel is placed in a large amount The oligomers and unreacted aniline monomers are removed from the deionized water to obtain pure bismuth tungstate-graphene-conductive hydrogel product.
  • the initiator is potassium persulfate; the molar feed ratio of the initiator to the aniline in step 6 is 1:1.
  • the feed ratio of bismuth tungstate, graphene, acrylamide, and aniline is 0.055:0.015:1:0.2 in terms of parts by mole.
  • Step 1 Weigh out 1mmol of sodium tungstate (Na 2 WO 4 ⁇ 2H 2 O), 2mmol of bismuth nitrate (Bi(NO 3 ) 3 ⁇ 5H 2 O) and 0.05g of CTAB, mix them and dissolve in 80ml of deionized water at 80°C , Stir at a speed of 1000r/min for 20 minutes until uniform, transfer to a hydrothermal kettle for hydrothermal reaction, where the temperature of the hydrothermal reaction is 160°C, and the time of the hydrothermal reaction is 18h. After the hydrothermal reaction is completed, the lamellar bismuth tungstate is obtained by successive washing and drying; wherein the washing method is washing with water and ethanol 3 times, and the drying method is: drying at 60°C for 10 hours.
  • the washing method is washing with water and ethanol 3 times
  • the drying method is: drying at 60°C for 10 hours.
  • Step 2 Take 400 mg of bismuth tungstate obtained in the previous step, dissolve it in 200 ml of deionized water, and ultrasonically peel off after dissolution to obtain dispersed two-dimensional bismuth tungstate nanosheets; wherein the frequency of ultrasonic dispersion is 22KHz, and the time of ultrasonic dispersion For 3h.
  • Step 3 Weigh 20mg of graphene and dissolve it in 10ml of deionized water, and dissolve the graphene by ultrasonic dispersion at a frequency of 53KHz for 10min to fully dissolve the graphene; after dissolution, perform laser treatment with a wavelength of 760nm, a pulse frequency of 30Hz, and a single pulse energy of 500mJ for 1h , Get graphene quantum dots.
  • Step 4 Take 5ml of the dispersed two-dimensional bismuth tungstate nanosheets obtained in step 2 and mix with the graphene quantum dot solution obtained in step 3.
  • the ultrasonic dispersion method can be used to make the two fully mixed .
  • the mass ratio of the dispersed two-dimensional bismuth tungstate nanosheets to the graphene quantum dots is 2:1.
  • Step 5 Prepare 5mol/L acrylamide (AM) solution, then add graphene-bismuth tungstate, cross-linking agent and initiator (0.05mol/L) to mix uniformly, polymerize at 80°C water bath temperature for 30min, get transparent
  • the jelly-like hydrogel is the fifth product.
  • the crosslinking agent is N,N'-diisopropyl bisacrylamide
  • the initiator is N,N,N',N'-tetramethylethylenediamine
  • acrylamide, crosslinking agent and initiator The molar feed ratio of the agent is 1:0.02:0.2.
  • Step 6 The first product is immersed in a hydrochloric acid (aniline concentration of 1 mol/L) solution containing aniline (ANI), and allowed to stand at room temperature for 12 hours to allow the aniline monomer to enter the fifth product, which is the sixth product.
  • a hydrochloric acid aniline concentration of 1 mol/L
  • aniline aniline
  • Step 7 The sixth product is immersed in the initiator aqueous solution, and the aniline monomer is polymerized at room temperature for 8 hours to form the crude bismuth tungstate-graphene-PAM-PANI conductive hydrogel, and the obtained crude conductive hydrogel is placed in a large amount The oligomers and unreacted aniline monomers are removed from the deionized water to obtain pure bismuth tungstate-graphene-conductive hydrogel product.
  • the initiator is N,N,N',N'-tetramethylethylenediamine; the molar feed ratio of the initiator to the aniline in step six is 1:1.
  • the feed ratio of bismuth tungstate, graphene, acrylamide, and aniline is 0.01:0.01:3:0.5 in terms of parts by mole.
  • the high-efficiency and high-purity synthesis of bismuth tungstate is firstly performed, but at this time, the prepared bismuth tungstate has a lamellar structure, and its stacking is serious and cannot be effectively catalyzed.
  • step two with the help of ultrasound, the aggregated bismuth tungstate is sonicated to effectively disperse it, and dispersed two-dimensional bismuth tungstate nanosheets are obtained, which increases the exposed area of bismuth tungstate and provides more More active area.
  • the obtained graphene quantum dots are zero-dimensional few-layer graphene materials, which are at the nanometer level in three dimensions, that is, graphene quantum dots can exhibit some unique properties, such as strong quantum Confinement effect, edge effect, good electron transfer ability and up-conversion luminescence characteristics, etc.; at the same time, graphene quantum dots also have good characteristics of non-toxicity and low price.
  • graphene quantum dots and two-dimensional tungstic acid Combined with bismuth nanosheets graphene quantum dots can be used as active sites to improve the catalytic activity of two-dimensional bismuth tungstate.
  • step five the prepared bismuth tungstate-graphene is incorporated into the three-dimensional structure of polyacrylamide.
  • aniline is further introduced and polymerized, and the conductive hydrogel is used as a catalyst carrier, which can not only achieve The uniform dispersion of the catalyst increases the active area of the catalyst; at the same time, the conductive hydrogel also has good electrical properties, and it combines with the catalyst to form a force-electric combined catalytic system, which further comprehensively improves the catalytic performance of the catalyst.
  • the gel-like carrier facilitates the recovery of the catalyst after use, and realizes the recovery and reuse of the catalyst.
  • This example is a specific example for measuring the catalytic performance of the graphene-bismuth tungstate-conductive hydrogel prepared in Examples 1 to 3.
  • the control catalyst used is bismuth tungstate powder.
  • the reference electrode is a saturated calomel electrode
  • counter electrode is a graphite electrode
  • 0.5mol L - 1 H 2 SO 4 solution is the electrolyte.
  • LSV linear sweep voltammetry
  • This example is a specific example for measuring the catalytic performance of the graphene-bismuth tungstate-hydrogel prepared in Examples 1 to 3.
  • the control used is bismuth tungstate without graphene quantum dots -Hydrogel catalytic system for photodegradation of rhodamine B.
  • the products prepared have a gel-like structure.
  • the gel prepared by the present invention is convenient and quick to recover, and can achieve rapid catalyst recovery. Easy to recycle.
  • this application provides a method for preparing bismuth tungstate-graphene-conductive hydrogel, which includes: preparing bismuth tungstate by hydrothermal reaction, ultrasonic stripping, preparing graphene quantum dots, laser ablation composite, cross-linking Union polymerization, aniline immersion and secondary polymerization.
  • the application also provides an application of the product obtained by the above preparation method in an electrolysis catalyst.
  • graphene quantum dots are introduced to increase active sites of bismuth tungstate to improve electrocatalytic performance; further, combined with conductive gel, based on the electrical properties and three-dimensional structure of conductive gel, The bismuth tungstate-graphene is further uniformly dispersed to prevent agglomeration of the catalyst, increase the catalytic area of the catalyst, and the gel is easy to recover after the catalysis is completed.
  • the preparation method and application of bismuth tungstate-graphene-conductive hydrogel provided by the present application solve the problem of poor catalytic performance and unrecyclable catalysts used in the cathode hydrogen evolution reaction of electrolyzed water in the prior art. Technical defects.

Abstract

La présente invention relève du domaine technique de la recherche et du développement de catalyseurs électrolytiques, et concerne en particulier un procédé de préparation et une application d'hydrogel conducteur de tungstate-graphène de bismuth. La présente invention concerne un procédé de préparation d'hydrogel conducteur de tungstate-graphène de bismuth, comprenant : la préparation de tungstate de bismuth par réaction hydrothermique, pelage par ultrasons, préparation de points quantiques de graphène, formulation par ablation laser, polymérisation par réticulation, immersion dans l'aniline et polymérisation secondaire. La présente invention concerne également l'application du produit obtenu par le procédé de préparation dans un catalyseur d'électrolyse. L'introduction de points quantiques de graphène augmente les sites actifs du tungstate de bismuth de façon à améliorer les performances électrocatalytiques, et la combinaison avec un gel conducteur permet de disperser de manière plus uniforme le tungstate-graphène de bismuth, de façon à empêcher l'agglomération du catalyseur, augmenter la zone catalytique du catalyseur, et de faciliter la récupération du gel après achèvement de la catalyse, ce qui permet de résoudre le défaut technique de l'état de la technique selon lequel le catalyseur utilisé pour la dégradation photoélectrique ou la réaction d'évolution d'hydrogène de cathode d'eau électrolysée a une performance catalytique médiocre et ne peut pas être récupéré.
PCT/CN2019/115252 2019-10-15 2019-11-04 Procédé de préparation et application d'hydrogel conducteur à base de tungstate-graphène de bismuth WO2021072818A1 (fr)

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