CN112774678A - Gold nanoparticle-supported cerium dioxide nanosheet material and synthesis method and application thereof - Google Patents
Gold nanoparticle-supported cerium dioxide nanosheet material and synthesis method and application thereof Download PDFInfo
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- 239000002135 nanosheet Substances 0.000 title claims abstract description 69
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- 229910000422 cerium(IV) oxide Inorganic materials 0.000 title claims abstract description 46
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 28
- 238000003756 stirring Methods 0.000 claims abstract description 24
- 238000001354 calcination Methods 0.000 claims abstract description 23
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- 238000000034 method Methods 0.000 claims abstract description 18
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- HSJPMRKMPBAUAU-UHFFFAOYSA-N cerium(3+);trinitrate Chemical compound [Ce+3].[O-][N+]([O-])=O.[O-][N+]([O-])=O.[O-][N+]([O-])=O HSJPMRKMPBAUAU-UHFFFAOYSA-N 0.000 claims abstract description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 14
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- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 14
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- 229910021389 graphene Inorganic materials 0.000 claims abstract description 13
- 229910000033 sodium borohydride Inorganic materials 0.000 claims abstract description 13
- 239000012279 sodium borohydride Substances 0.000 claims abstract description 13
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- 229910002091 carbon monoxide Inorganic materials 0.000 claims abstract description 6
- 238000001914 filtration Methods 0.000 claims abstract description 6
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 5
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
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- 229910052799 carbon Inorganic materials 0.000 description 1
- GWXLDORMOJMVQZ-UHFFFAOYSA-N cerium Chemical compound [Ce] GWXLDORMOJMVQZ-UHFFFAOYSA-N 0.000 description 1
- DRVWBEJJZZTIGJ-UHFFFAOYSA-N cerium(3+);oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Ce+3].[Ce+3] DRVWBEJJZZTIGJ-UHFFFAOYSA-N 0.000 description 1
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- 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
- B01J23/38—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals
- B01J23/54—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of noble metals combined with metals, oxides or hydroxides provided for in groups B01J23/02 - B01J23/36
- B01J23/66—Silver or gold
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/864—Removing carbon monoxide or hydrocarbons
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- B01J35/40—
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- B01J35/50—
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- B01J35/615—
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- 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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
Abstract
The invention discloses a gold nanoparticle-supported cerium dioxide nanosheet material, and a synthesis method and application thereof. The method comprises the following steps: adding graphene oxide into water, uniformly dispersing, adding cerium nitrate, and stirring to obtain a precursor; adding the precursor into water to obtain precursor dispersion, freezing with liquid nitrogen, and drying to obtain a dried product; heating and calcining to obtain two-dimensional cerium oxide nanosheets; adding polyvinyl alcohol solution and chloroauric acid solution into water, adding sodium borohydride solution, mixing to obtain mixed solution, and mixing two-dimensional cerium oxide nano-particlesAdding the sheet into the mixed solution, stirring, filtering and taking precipitate to obtain the gold nanoparticle loaded cerium dioxide nanosheet material. The gold nanoparticles synthesized by the method are loaded on cerium dioxide nanosheets, and have large specific surface area and high-concentration Ce3+The method improves the concentration of oxygen vacancies on the surface of the cerium oxide, shows excellent catalytic performance when used for catalyzing the oxidation reaction of carbon monoxide, and has good application prospect.
Description
Technical Field
The invention belongs to the technical field of nano material preparation and carbon monoxide oxidation catalytic reaction, and particularly relates to a gold nanoparticle supported cerium dioxide nanosheet material, and a synthesis method and application thereof.
Background
Cerium oxide has excellent redox ability, oxygen storage and oxygen exchange ability, is an important rare earth material, and is widely applied to the fields of automobile exhaust treatment, fuel cells, gas sensors, polishing agents and the like. In recent years, a large number of researchers have synthesized cerium oxide nanomaterials with various morphologies (particles, cubes, rods, wires, flowers, spheres, sheets), and have been widely used for reactions such as methane reforming, CO oxidation, and water gas shift due to their special physicochemical properties. A large number of researches show that the performance of catalyzing reactions such as CO oxidation, water gas conversion and the like and the surface oxygen vacancy or Ce of the cerium oxide3+There is a direct relationship between concentrations (Lei, L, et al. transformations of Biomass, Its Derivatives, and Downstream Chemicals over Ceria catalysts. ACS Catalysis 2020,10(15), 8788-. However, the conventional three-dimensional cerium oxide nanomaterial has a small specific surface area and a sufficiently high concentration of surface oxygen vacancies. Therefore, the application of the cerium oxide nanomaterial is limited to some extent. The two-dimensional material has large specific surface area, excellent electron transmission performance and more active sites, and can effectively overcome the defects of the three-dimensional cerium oxide nano material, so that how to prepare the two-dimensional cerium oxide nano material becomes a hot spot problem to which researchers pay attention. However, the synthesis of two-dimensional cerium oxide nanoplates still presents significant challenges. Since the cerium oxide crystal structure is not a layer but a typical fluorite structure, the space group is Fm3m (Jiang, S, et al. promoting Formation of Oxygen catalysts in Two-Dimensional Cobalt-Doped cerium Nanosheets for Efficient moisture evolution. J Am Chem Soc 2020,142(14),6461-6466.)Two-dimensional materials, such as ultrasonic stripping and hydrothermal methods, are difficult to synthesize uniform two-dimensional cerium oxide nanosheets. Therefore, it is urgently needed to develop a new method for synthesizing two-dimensional cerium oxide nanosheets to solve the above problems.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a cerium dioxide nanosheet material loaded with gold nanoparticles, and a synthesis method and application thereof.
According to the synthesis method provided by the invention, graphene oxide is used as a template, then cerium salt is added, under the action of electrostatic attraction, uniform adsorption is carried out on the surface of the graphene oxide, cerium oxide nanosheets are obtained through a series of steps of washing with deionized water, centrifugation, ultrasonic redispersion, quick freezing with liquid nitrogen, freeze drying and calcination in air, and then gold nanoparticles are synthesized by a sol precipitation method and loaded on two-dimensional cerium oxide nanosheets, so that high-concentration Ce with a large specific surface area is obtained3+The method can effectively overcome some defects of the traditional three-dimensional cerium oxide material, and meanwhile, the material can be applied to CO oxidation reaction and shows excellent performance.
The purpose of the invention is realized by at least one of the following technical solutions.
The synthesis method of the gold nanoparticle-supported cerium dioxide nanosheet material provided by the invention comprises the following steps:
(1) adding Graphene Oxide (GO) into water, performing ultrasonic dispersion uniformly, adding cerium nitrate, stirring, centrifuging to obtain a precipitate, and washing to obtain a precursor;
(2) adding the precursor in the step (1) into water, uniformly dispersing by ultrasonic to obtain a precursor dispersion liquid, freezing by using liquid nitrogen, and freeze-drying to obtain a dried product; heating the dried product to perform calcination treatment to obtain a two-dimensional cerium oxide nanosheet;
(3) mixing polyvinyl alcohol (PVA) solution and chloroauric acid (HAuCl)4·3H2O) solution is added into water, stirred evenly and then added with sodium borohydride solution (NaBH)4Solution) and uniformly mixing to obtain a mixed solution, adding the two-dimensional cerium oxide nanosheet obtained in the step (2) into the mixed solution, stirring, filtering to obtain a precipitate, washing with deionized water, and drying to obtain the gold nanoparticle-loaded cerium dioxide nanosheet material.
Further, the mass-to-volume ratio of the graphene oxide to water in the step (1) is 1-2: 1 mg/ml; the molar volume ratio of the cerium nitrate to the water is 0.05-0.1: 1 mol/L; the time of the stirring treatment is 90-120min, and the rotating speed of the stirring treatment is 800-900 r/min.
Preferably, the rate of the centrifugation in step (1) is 8000-9000 r/min.
Further, the mass-volume ratio of the precursor to water in the step (2) is 10-20 mg/ml; the freezing treatment with liquid nitrogen comprises the following steps: freezing the precursor dispersion liquid under the condition of liquid nitrogen for 10-20 s; the freeze drying is carried out at a temperature of-50 ℃ to-30 ℃ for 3-5 days.
Further, the temperature of the calcination treatment in the step (2) is 400-; the atmosphere of the calcination treatment is an air atmosphere.
Preferably, the temperature of the calcination treatment in step (2) is 400 ℃.
Further, the mass percent concentration of the polyvinyl alcohol solution in the step (3) is 0.5-1 wt%; the concentration of the chloroauric acid solution is 0.0125-0.025 mol.L-1(ii) a The volume ratio of the polyvinyl alcohol solution to the chloroauric acid solution is 1:3-1: 6.
Preferably, the concentration of the chloroauric acid solution in the step (3) is 0.0125 mol/L.
Preferably, the concentration of the polyvinyl alcohol (PVA) solution in the step (3) is 0.5 wt%.
Preferably, the volume ratio of the polyvinyl alcohol solution to the chloroauric acid solution in the step (3) is 675 μ l: 2 ml.
Further, the concentration of the sodium borohydride solution in the step (3) is 0.1-0.2 mol.L-1(ii) a The volume ratio of the sodium borohydride solution to the chloroauric acid solution is 0.65:1-1.3: 1; the volume ratio of the water to the chloroauric acid solution is 71:1-142: 1. .
Preferably, the concentration of the sodium borohydride solution in the step (3) is 0.1 mol.L-1。
Preferably, the volume ratio of the sodium borohydride solution to the chloroauric acid solution in the step (3) is 1.30 ml: 2 ml.
Further, the mass-to-volume ratio of the two-dimensional cerium oxide nanosheets to water in the step (3) is 2-4 mg/ml.
Preferably, the mass-to-volume ratio of the two-dimensional cerium oxide nanosheets to water in step (3) is 2mg/ml.
Further, the rotation speed of the stirring treatment in the step (3) is 600-; the drying temperature is 60-70 ℃, and the drying time is 8-12 h.
Preferably, the rotation speed of the stirring treatment in the step (3) is 600r/min, and the time of the stirring treatment is 0.5 h.
The invention provides a cerium dioxide nanosheet material loaded with gold nanoparticles prepared by the synthesis method.
The gold nanoparticles provided by the invention are loaded on the cerium dioxide nanosheet material to catalyze the carbon monoxide oxidation reaction.
Compared with the prior art, the invention has the following advantages and beneficial effects:
(1) according to the synthesis method provided by the invention, graphene oxide is used as a template, then cerium salt is added, under the action of electrostatic attraction, the graphene oxide is uniformly adsorbed on the surface of the graphene oxide, and a series of steps of deionized water washing, centrifugation, ultrasonic redispersion, liquid nitrogen quick freezing, freeze drying and calcination in air are carried out to obtain cerium oxide nanosheets; the method realizes controllable preparation of the two-dimensional cerium oxide nanosheet, has uniform appearance, 1.2-1.4nm thickness and specific electron transmission performance.
(2) According to the synthesis method provided by the invention, the gold nanoparticles are synthesized by a sol precipitation method and loaded on the two-dimensional cerium oxide nanosheet, and the surface of the material has a large specific surface area, rich oxygen vacancies and high-concentration Ce3+The agglomeration of gold nanoparticles is avoided, and the performance of catalyzing CO oxidation reaction is obviously improved.
Drawings
Fig. 1 is a schematic flow diagram of a synthesis method of a gold nanoparticle-supported ceria nanosheet material provided in example 1 of the present invention;
FIG. 2 is a TEM image of two-dimensional cerium oxide nanosheets obtained in step (2) of example 1;
fig. 3 TEM image of two-dimensional cerium oxide nanosheets obtained in example 2, step (2);
fig. 4 SEM image of two-dimensional cerium oxide nanosheets obtained in step (2) of example 2;
FIGS. 5a and 5b are AFM images of two-dimensional cerium oxide nanoplates obtained in step (2) of example 2;
FIG. 6 HRTEM image of cerium oxide nanosheets supported by gold nanoparticles obtained in example 2;
fig. 7 is a BET test result graph of the gold nanoparticles supported on the cerium dioxide nanosheets obtained in example 2;
fig. 8 TEM image of two-dimensional cerium oxide nanosheets obtained in example 3, step (2);
fig. 9 is a graph showing the test results of CO oxidation reaction performance of the gold nanoparticles supported on the cerium oxide nanosheets obtained in the example.
Detailed Description
The following examples are presented to further illustrate the practice of the invention, but the practice and protection of the invention is not limited thereto. It is noted that the processes described below, if not specifically described in detail, are all realizable or understandable by those skilled in the art with reference to the prior art. The reagents or apparatus used are not indicated to the manufacturer, and are considered to be conventional products available by commercial purchase.
Example 1
A method for synthesizing gold nanoparticles supported on ceria nanosheet material, as shown in fig. 1, includes the following steps:
(1) adding 50mg of graphene oxide into 50ml of water, uniformly dispersing by ultrasonic waves (the time is 15min), then adding 2.5mmol of cerium nitrate, stirring (the time is 120min, the rotating speed is 900r/min), centrifuging to obtain a precipitate (the rotating speed is 9000r/min), and washing for 3 times by using deionized water to obtain a precursor;
(2) adding the precursor in the step (1) into 15ml of water, uniformly dispersing by ultrasonic waves (the ultrasonic time is 20min) to obtain precursor dispersion liquid, freezing by using liquid nitrogen (the ultrasonic time is 10-20s), and freeze-drying for 3 days at the temperature of-50 ℃ to obtain a dried product; heating the dried product to carry out calcination treatment, wherein the temperature of the calcination treatment is 400 ℃, the time of the calcination treatment is 2 hours, and the atmosphere of the calcination treatment is air atmosphere, so as to obtain a two-dimensional cerium dioxide nanosheet;
(3) 675. mu.l of a polyvinyl alcohol solution (concentration of 1 wt%) and 2ml of a chloroauric acid solution (concentration of 0.0125 mol. multidot.L) were added-1) Adding into 48ml deionized water, stirring well (10 min), adding 1.30ml sodium borohydride solution (concentration of 0.1 mol. L)-1) And uniformly mixing to obtain a mixed solution (wine red solution), adding 500mg of the two-dimensional cerium oxide nanosheet obtained in the step (2) into the mixed solution, stirring (rotating speed is 800r/min, time is 30min), filtering to obtain a precipitate, washing with deionized water, and drying at the temperature of 60 ℃ for 12h to obtain the gold nanoparticle-loaded cerium dioxide nanosheet material.
Example 2
(1) Adding 100mg of graphene oxide into 50ml of water, uniformly dispersing by ultrasonic waves (the time is 15min), then adding 5mmol of cerium nitrate, stirring (the time is 120min, the rotating speed is 900r/min), centrifuging to obtain a precipitate (the rotating speed is 9000r/min), and washing for 3 times by using deionized water to obtain a precursor;
(2) adding the precursor in the step (1) into 15ml of water, uniformly dispersing by ultrasonic waves (the ultrasonic time is 20min) to obtain precursor dispersion liquid, freezing by using liquid nitrogen (the ultrasonic time is 10-20s), and freeze-drying for 3 days at the temperature of-50 ℃ to obtain a dried product; heating the dried product to carry out calcination treatment, wherein the temperature of the calcination treatment is 400 ℃, the time of the calcination treatment is 4h, and the atmosphere of the calcination treatment is air atmosphere, so as to obtain a two-dimensional cerium dioxide nanosheet;
(3) 675. mu.l of a polyvinyl alcohol solution (concentration of 0.5 wt%) and 2ml of a chloroauric acid solution (concentration of 0.0125 mol. multidot.L) were added-1) Adding into 48ml deionized water, stirring uniformly (For 10min), then 1.30ml of sodium borohydride solution (concentration 0.1 mol. L) is added-1) And uniformly mixing to obtain a mixed solution (wine red solution), adding 500mg of the two-dimensional cerium oxide nanosheet obtained in the step (2) into the mixed solution, stirring (rotating speed is 800r/min, time is 30min), filtering to obtain a precipitate, washing with deionized water, and drying at the temperature of 60 ℃ for 12h to obtain the gold nanoparticle-loaded cerium dioxide nanosheet material.
Example 3
(1) Adding 100mg of graphene oxide into 50ml of water, uniformly dispersing by ultrasonic waves (the time is 15min), then adding 2.5mmol of cerium nitrate, stirring (the time is 120min, the rotating speed is 900r/min), centrifuging to obtain a precipitate (the rotating speed is 9000r/min), and washing for 3 times by using deionized water to obtain a precursor;
(2) adding the precursor in the step (1) into 15ml of water, uniformly dispersing by ultrasonic waves (the ultrasonic time is 20min) to obtain precursor dispersion liquid, freezing by using liquid nitrogen (the ultrasonic time is 10-20s), and freeze-drying for 3 days at the temperature of-50 ℃ to obtain a dried product; heating the dried product to carry out calcination treatment, wherein the temperature of the calcination treatment is 600 ℃, the time of the calcination treatment is 4h, and the atmosphere of the calcination treatment is air atmosphere, so as to obtain a two-dimensional cerium dioxide nanosheet;
(3) 675. mu.l of a polyvinyl alcohol solution (concentration of 0.5 wt%) and 2ml of a chloroauric acid solution (concentration of 0.025 mol. multidot.L) were added-1) Adding into 48ml deionized water, stirring well (10 min), adding 1.30ml sodium borohydride solution (concentration of 0.2 mol. L)-1) And uniformly mixing to obtain a mixed solution (wine red solution), adding 500mg of the two-dimensional cerium oxide nanosheet obtained in the step (2) into the mixed solution, stirring (rotating speed is 800r/min, time is 30min), filtering to obtain a precipitate, washing with deionized water, and drying at the temperature of 60 ℃ for 12h to obtain the gold nanoparticle-loaded cerium dioxide nanosheet material.
Effect verification
Fig. 2 is a TEM image of two-dimensional cerium oxide nanoplates obtained in example 1; figure 3 TEM image of two-dimensional ceria nanoplates obtained in example 2; fig. 4 SEM image of two-dimensional ceria nanoplates obtained in example 2; as can be seen from fig. 2, 3 and 4, the obtained two-dimensional ceria nanosheets exhibited a lamellar structure with a lateral dimension of about 5 μm. FIGS. 5a and 5b are AFM images of two-dimensional cerium oxide nanoplates obtained in step (2) of example 2; as can be seen from fig. 5a and 5b, the thickness of the two-dimensional ceria nanosheet obtained in example 2 is 1.2-1.4 nm.
Fig. 6 is an HRTEM showing that the gold nanoparticles obtained in example 2 were supported on a ceria nanosheet material, and as can be seen from fig. 6, gold nanoparticles of about 4nm were uniformly distributed on the surface of the ceria nanosheet. Gold nanoparticles prepared in other examples were supported on ceria nanosheet material, and there were also gold nanoparticles uniformly distributed, as can be seen in fig. 6.
Fig. 7 is a BET test result graph of the gold nanoparticles supported on the ceria nanosheet material obtained in example 2. As can be seen from FIG. 7, the specific surface area of the cerium oxide nanosheet material supported by the gold nanoparticles obtained in example 2 was 116.901m2/g。
Fig. 8 is a TEM image of the two-dimensional cerium dioxide nanosheet obtained in example 3, and it can be seen from fig. 8 that when the calcination temperature is 600 ℃, and the concentration of sodium borohydride is increased, the cerium dioxide nanosheet is agglomerated, and some nano-particles are gradually formed.
And (3) the gold nanoparticles prepared in the embodiment are supported on the cerium dioxide nanosheet material to catalyze the carbon monoxide conversion reaction. The application comprises the following steps:
(1) sieving 50mg of the gold nanoparticles loaded on a cerium dioxide nanosheet material, wherein the size of a sieve pore is 20-40 meshes, then placing the gold nanoparticles in a reactor, introducing air, heating to 300 ℃ in the air atmosphere, and activating for 2 hours;
(2) introducing nitrogen into the reactor, blowing the nano sheet material by the nitrogen, cooling to room temperature, introducing CO and O into the reactor2And N2The mixed gas of (3); in the mixed gas, the volume fraction of CO is 1%, O2Is 20% by volume; the gas flow rate was 80000 mL gcat -1·h-1The temperature is raised to carry out the oxidation catalytic reaction of carbon monoxideAt a rate of 2 ℃ min-1。
Fig. 9 is a graph showing the test results of CO oxidation reaction performance of the gold nanoparticles supported on the ceria nanosheet material obtained in the example. As can be seen from FIG. 9, the CO conversion reached 90% at 94 ℃.
According to the synthesis method provided by the invention, the gold nanoparticles are synthesized by a sol precipitation method and loaded on the two-dimensional cerium oxide nanosheet, and the surface of the material has a large specific surface area, rich oxygen vacancies and high-concentration Ce3+The agglomeration of gold nanoparticles is avoided, and the performance of catalyzing CO oxidation reaction is obviously improved.
The above examples are only preferred embodiments of the present invention, which are intended to be illustrative and not limiting, and those skilled in the art should understand that they can make various changes, substitutions and alterations without departing from the spirit and scope of the invention.
Claims (10)
1. A synthesis method of a gold nanoparticle-supported cerium dioxide nanosheet material is characterized by comprising the following steps:
(1) adding graphene oxide into water, performing ultrasonic dispersion uniformly, then adding cerium nitrate, stirring, centrifuging to obtain a precipitate, and washing to obtain a precursor;
(2) adding the precursor in the step (1) into water, uniformly dispersing by ultrasonic to obtain a precursor dispersion liquid, freezing by using liquid nitrogen, and freeze-drying to obtain a dried product; heating the dried product to perform calcination treatment to obtain a two-dimensional cerium oxide nanosheet;
(3) adding a polyvinyl alcohol solution and a chloroauric acid solution into water, uniformly mixing, then adding a sodium borohydride solution, uniformly mixing to obtain a mixed solution, adding the two-dimensional cerium oxide nanosheet into the mixed solution, stirring, filtering to obtain a precipitate, washing, and drying to obtain the gold nanoparticle supported cerium dioxide nanosheet material.
2. The method for synthesizing gold nanoparticles supported on ceria nanosheet material according to claim 1, wherein the mass-to-volume ratio of graphene oxide to water in step (1) is 1-2: the molar volume ratio of 1mg/ml of the cerium nitrate to water is 0.05-0.1: 1 mol/L; the time of the stirring treatment is 90-120min, and the rotating speed of the stirring treatment is 800-900 r/min.
3. The method for synthesizing gold nanoparticles supported on ceria nanosheet material according to claim 1, wherein the mass to volume ratio of the precursor to water in step (2) is from 10 to 20: 1mg/ml, the freezing treatment with liquid nitrogen comprises: freezing the precursor dispersion liquid under the condition of liquid nitrogen for 10-20 s; the freeze drying is carried out at a temperature of-50 ℃ to-30 ℃ for 3-5 days.
4. The method for synthesizing gold nanoparticles supported on ceria nanosheet material according to claim 1, wherein the calcination treatment in step (2) is carried out at a temperature of 400-600 ℃ for a time of 2-4 h; the atmosphere of the calcination treatment is an air atmosphere.
5. The method for synthesizing gold nanoparticles supported on ceria nanosheet material according to claim 1, wherein the polyvinyl alcohol solution of step (3) has a mass percent concentration of 0.5 to 1 wt%; the concentration of the chloroauric acid solution is 0.0125-0.025 mol.L-1(ii) a The volume ratio of the polyvinyl alcohol solution to the chloroauric acid solution is 1:3-1: 6.
6. The method for synthesizing gold nanoparticle-supported ceria nanosheet material according to claim 1, wherein the concentration of the sodium borohydride solution in the step (3) is 0.1 to 0.2 mol-L-1(ii) a The volume ratio of the sodium borohydride solution to the chloroauric acid solution is 0.65:1-1.3: 1; the volume ratio of the water to the chloroauric acid solution is 71:1-142: 1.
7. The method for synthesizing gold nanoparticles supported on ceria nanosheets material according to claim 1, wherein the mass to volume ratio of the two-dimensional ceria nanosheets to water in step (3) is 2-4 mg/ml.
8. The method for synthesizing gold nanoparticles supported on ceria nanosheet material according to claim 1, wherein the rotation speed of the stirring treatment in the step (3) is 600-800r/min, and the stirring treatment time is 0.5-1 h; the drying temperature is 60-70 ℃, and the drying time is 8-12 h.
9. A ceria nanoplatelet loaded gold nanoparticles prepared by the synthesis method of any one of claims 1-8.
10. Use of gold nanoparticles supported on ceria nanosheet material according to claim 9 to catalyze the oxidation of carbon monoxide.
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