CN108940259B - Hierarchical porous MoO2Photocatalyst microsphere and preparation method thereof - Google Patents
Hierarchical porous MoO2Photocatalyst microsphere and preparation method thereof Download PDFInfo
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- 239000004005 microsphere Substances 0.000 title claims abstract description 43
- 238000002360 preparation method Methods 0.000 title claims abstract description 22
- QXYJCZRRLLQGCR-UHFFFAOYSA-N molybdenum(IV) oxide Inorganic materials O=[Mo]=O QXYJCZRRLLQGCR-UHFFFAOYSA-N 0.000 claims abstract description 88
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 claims abstract description 63
- 239000011941 photocatalyst Substances 0.000 claims abstract description 40
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 22
- 239000011259 mixed solution Substances 0.000 claims abstract description 20
- 239000013354 porous framework Substances 0.000 claims abstract description 4
- 239000000243 solution Substances 0.000 claims description 42
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000008367 deionised water Substances 0.000 claims description 10
- 229910021641 deionized water Inorganic materials 0.000 claims description 10
- 238000007664 blowing Methods 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 3
- 230000001699 photocatalysis Effects 0.000 abstract description 15
- 239000003054 catalyst Substances 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 10
- 238000005507 spraying Methods 0.000 abstract description 10
- 238000005054 agglomeration Methods 0.000 abstract description 5
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- 238000007146 photocatalysis Methods 0.000 abstract description 5
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- 239000002994 raw material Substances 0.000 abstract description 3
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 2
- 238000009826 distribution Methods 0.000 abstract description 2
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 2
- 239000002904 solvent Substances 0.000 abstract description 2
- 238000003911 water pollution Methods 0.000 abstract description 2
- 238000002485 combustion reaction Methods 0.000 description 13
- 238000005245 sintering Methods 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 9
- 238000001816 cooling Methods 0.000 description 7
- 238000005049 combustion synthesis Methods 0.000 description 6
- 230000001681 protective effect Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Chemical compound O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 description 4
- 238000001878 scanning electron micrograph Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000005303 weighing Methods 0.000 description 4
- 238000006555 catalytic reaction Methods 0.000 description 3
- 229940043267 rhodamine b Drugs 0.000 description 3
- RBTBFTRPCNLSDE-UHFFFAOYSA-N 3,7-bis(dimethylamino)phenothiazin-5-ium Chemical compound C1=CC(N(C)C)=CC2=[S+]C3=CC(N(C)C)=CC=C3N=C21 RBTBFTRPCNLSDE-UHFFFAOYSA-N 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 2
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 2
- 238000009841 combustion method Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 125000000325 methylidene group Chemical group [H]C([H])=* 0.000 description 2
- 229960000907 methylthioninium chloride Drugs 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
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- 238000012986 modification Methods 0.000 description 2
- 239000002105 nanoparticle Substances 0.000 description 2
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- ZOKXTWBITQBERF-UHFFFAOYSA-N Molybdenum Chemical compound [Mo] ZOKXTWBITQBERF-UHFFFAOYSA-N 0.000 description 1
- 238000002441 X-ray diffraction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
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- 238000010586 diagram Methods 0.000 description 1
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- 230000031700 light absorption Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229910052750 molybdenum Inorganic materials 0.000 description 1
- 239000011733 molybdenum Substances 0.000 description 1
- 239000002086 nanomaterial Substances 0.000 description 1
- 150000002894 organic compounds Chemical class 0.000 description 1
- 239000011368 organic material Substances 0.000 description 1
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- 230000001105 regulatory effect Effects 0.000 description 1
- PYWVYCXTNDRMGF-UHFFFAOYSA-N rhodamine B Chemical compound [Cl-].C=12C=CC(=[N+](CC)CC)C=C2OC2=CC(N(CC)CC)=CC=C2C=1C1=CC=CC=C1C(O)=O PYWVYCXTNDRMGF-UHFFFAOYSA-N 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- 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
- B01J23/28—Molybdenum
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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
- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/30—Catalysts, in general, characterised by their form or physical properties characterised by their physical properties
- B01J35/39—Photocatalytic properties
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- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/50—Catalysts, in general, characterised by their form or physical properties characterised by their shape or configuration
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- B01J35/00—Catalysts, in general, characterised by their form or physical properties
- B01J35/60—Catalysts, in general, characterised by their form or physical properties characterised by their surface properties or porosity
- B01J35/64—Pore diameter
- B01J35/651—50-500 nm
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/30—Treatment of water, waste water, or sewage by irradiation
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Abstract
Hierarchical porous MoO2A photocatalyst microsphere and a preparation method thereof, belonging to the field of photocatalyst microspheres and preparation methods thereof. Porous MoO of the invention2The photocatalyst microsphere consists of a porous shell and a reticular porous framework inside the shell; the method comprises the steps of taking citric acid as a fuel, ammonium paramolybdate as a raw material and water as a solvent, preparing a mixed solution through magnetic stirring, spraying the mixed solution into a tubular furnace at 400-500 ℃ through ultrasonic spraying, and preparing the hierarchical-structure hollow porous MoO2Photocatalyst microspheres. The preparation system has the advantages of simple process method operation, cheap raw materials, economy, feasibility and the like. The catalyst prepared by the method has a special hierarchical structure, has the appearance characteristics of hollow and porous structure, is fine in particle size, uniform in distribution and free of agglomeration, has a microsphere diameter of 0.5-2 mu m, is good in photocatalytic performance and hydrophilicity, and is beneficial to application in the fields of photocatalysis, water pollution treatment, lithium ion batteries, supercapacitors, gas sensors and the like.
Description
Technical Field
The invention relates to a photocatalyst microsphere and a preparation method thereof, in particular to a hierarchical porous MoO2 photocatalyst microsphere and a preparation method thereof.
Background
Photocatalytic oxidation technology is considered to be one of the most promising technologies for solving the problem of environmental pollution. To date, over 3000 refractory organic compounds have been found to degrade rapidly by photocatalytic oxidation. Among the semiconductors commonly used in the photocatalytic technology, MoO2 has relatively low preparation cost, low crystallization and growth temperature, and is easy to prepare various shapes and structures, thereby attracting more and more attention. However, the preparation difficulty of MoO2 is high, the MoO2 is easily oxidized into MoO3 in the preparation process, the purity of the MoO3 is reduced, and the problems of low solar energy utilization rate and high carrier recombination rate of MoO2 in practical application exist. At present, in order to further improve the photocatalytic performance, methods mainly adopted include morphology control, composite system construction, doping, auxiliary agent surface modification and the like.
For the traditional semiconductor oxide photocatalytic material, the modification of the morphology and the size of the catalyst is the simplest and effective method for improving the photocatalytic performance. At present, a plurality of preparation methods for controlling the morphology of MoO2 exist, wherein solution combustion synthesis is one of the most widely researched catalyst preparation methods. The solution combustion method is a wet chemical synthesis method, and uses external energy to induce reactant to produce chemical reaction, and the released heat can promote the reaction to automatically spread in the form of combustion wave. The synthesis technology mainly regulates and controls the properties of phase composition, particle size, micro morphology and the like of the synthesized powder by regulating the released heat and the rate thereof in the combustion process. However, the method has the defects that the preparation temperature is not controllable, the prepared catalyst is easy to agglomerate, the reutilization rate is poor, the photocatalytic performance of the catalyst synthesized by solution combustion is poor, and the application of the photocatalytic technology in actual production is limited.
Because solution combustion synthesis relies on the heat released from the combustion of organic materials to sustain the reaction, most research has focused on the influence of the choice of organic fuel on the morphology of the product. However, no matter what organic matter is selected, the finally obtained foam-shaped oxide powder is seriously agglomerated, and the influence on the appearance of the product is not great.
Disclosure of Invention
Aiming at the defects, the invention aims to provide a hierarchical porous MoO2 photocatalyst microsphere and a preparation method thereof, and solves the problems that the MoO2 catalyst is difficult to prepare, the temperature is uncontrollable, the agglomeration is easy to occur and the reutilization rate is poor in the existing solution combustion method.
The object of the invention is achieved by comprising: porous MoO2 photocatalyst microspheres and a preparation method of porous MoO2 photocatalyst microspheres.
The porous MoO2 photocatalyst microsphere is composed of a porous shell and a reticular porous framework inside.
The diameter of the porous MoO2 photocatalyst microspheres is 0.5-2 μm.
The diameter of the inner reticular porous pores of the porous MoO2 photocatalyst microspheres is 50-200 nm.
The preparation method of the porous MoO2 photocatalyst microspheres comprises the following steps:
step 1, preparing a solution, namely dissolving ammonium paramolybdate and citric acid into water, and preparing a mixed solution by magnetic stirring, wherein the water is 10m L, the ammonium paramolybdate is 1.5-2.5 mmol, the citric acid is 1-3 mmol, the purity of the ammonium paramolybdate is 99.6%, the purity of the citric acid is analytically pure, and the water is deionized water.
And 2, putting the mixed solution prepared in the step 1 into an ultrasonic atomizer, atomizing the mixed solution through the ultrasonic atomizer, blowing the atomized mixed solution into a tubular heating furnace through air, wherein the flow rate of the atomized mixed solution carried by the air is 20-40 m L/h, and obtaining the porous MoO2 photocatalyst microspheres at the outlet end of the tubular heating furnace.
The tube furnace is provided with a working tube cavity, the inlet end of the working tube cavity is provided with a tee joint, one end of the tee joint is introduced into the working tube cavity, the other end of the tee joint is connected with the output end of the ultrasonic atomizer, and the other end of the tee joint is connected with the air output end; a heating device is arranged outside the working tube cavity, the temperature of the middle position of the working tube cavity is 400-500 ℃, and the temperatures of the two ends are room temperature; the outlet end of the working tube cavity is a product outlet.
The method has the beneficial effects that by adopting the scheme, water is used as a solvent in the solution, ammonium paramolybdate is used as a molybdenum source, citric acid is used as a fuel, the prepared solution is sprayed into a 400-500 ℃ tubular furnace at a speed of 20-40 m L/h through an ultrasonic atomizer, the whole spraying process is carried out in an air atmosphere, the ammonium paramolybdate generates fine MoO2 nano particles under the reduction action of the citric acid in the combustion process, the combustion process is cooled along with the furnace, the nano particles are aggregated and crystallized on the surfaces of the microspheres in the cooling process to form a hierarchical structure, and finally the porous MoO2 photocatalyst microspheres are generated.
The invention creatively combines ultrasonic spraying and solution combustion, reduces agglomeration among catalysts, prepares uniformly dispersed porous oxide, and roughly calculates that 10m L solution is atomized into countless drops with the diameter of 1 mu m through ultrasonic spraying, which is equivalent to that the solution is refined into 2390 hundred million reaction units, thus greatly improving the reaction rate and the homogenization degree, and the ultrasonic spraying and the solution combustion are combined for preparing the photocatalyst, and no report about ultrasonic spraying solution combustion synthesis exists at present.
Compared with the traditional solution combustion synthesis, the hierarchical structure porous MoO2 microsphere prepared by the ultrasonic spray solution combustion synthesis method has the advantages that the reaction is quicker and more sufficient because the solution exists in a superfine droplet form, the prepared catalyst is not easy to agglomerate, and the hierarchical structure porous special morphology is also provided.
(1) The solution is combusted and refined to the micron level through ultrasonic spraying, the reaction time of the combustion of the ultrasonic spraying solution is shorter and more sufficient compared with the combustion of the traditional solution, the microscopic size of the product is smaller, the agglomeration is not easy to happen, and the hydrophilicity is better.
(2) Under the condition of not adding combustion additives, the ammonium paramolybdate can not generate solution combustion reaction, the solution is atomized to the micron level, the reaction diffusion distance is shortened, and some reactions which are difficult to synthesize by solution combustion can be prepared by ultrasonic spray solution combustion synthesis.
(3) The prepared MoO2 has a hierarchical structure and a porous special morphology, and the catalyst with the structure has the advantages that: the hierarchical structure can be more beneficial to the transportation of substances on the basis of keeping the characteristics of the nano structure; the porous structure can improve the selectivity of the catalyst, improve the reaction rate, provide more low-coordination atoms to promote the catalysis, and increase the scattering and absorption of light.
The advantages are that: the preparation system has simple process method, cheap raw materials and is economically feasible. The photocatalyst microspheres prepared by the method have a special hierarchical structure, have the appearance characteristics of hollow and porous structures, are fine in particle size, uniform in distribution and free of agglomeration, have the diameter of 0.5-2 mu m, are good in photocatalytic performance and hydrophilicity, and are beneficial to application in the fields of photocatalysis, water pollution treatment, lithium ion batteries, supercapacitors, gas sensors and the like.
Drawings
FIG. 1 is a schematic diagram of the preparation process of the present invention;
FIG. 2 is a phase composition XRD pattern of the porous MoO2 photocatalyst microspheres of the present invention;
FIG. 3(a) is an SEM image of MoO2 prepared at 400 ℃;
FIG. 3(b) is an SEM image of MoO2 prepared at 500 ℃;
FIG. 3(c) is a partial enlarged view of FIG. 3 (a);
FIG. 3(d) is a partial enlarged view of FIG. 3 (b);
FIG. 4(a) is methylene blue and rhodamine B at 30 mg/L;
FIG. 4(b) graph of the photocatalysis of MoO2 and commercially available TiO2 measured as contaminants in methylene blue at 30 mg/L.
Detailed Description
As shown in fig. 1, the hierarchical porous MoO2 photocatalyst microspheres of the present invention include:
the porous MoO2 photocatalyst microsphere is composed of a porous shell and a reticular porous framework inside.
The diameter of the porous MoO2 photocatalyst microspheres is 0.5-2 μm.
The diameter of the inner reticular porous pores of the porous MoO2 photocatalyst microspheres is 50-200 nm.
The preparation method of the porous MoO2 photocatalyst microspheres comprises the following steps:
step 1, preparing a solution, namely dissolving ammonium paramolybdate and citric acid into water, and preparing a mixed solution by magnetic stirring, wherein the water is 10m L, the ammonium paramolybdate is 1.5-2.5 mmol, the citric acid is 1-3 mmol, the purity of the ammonium paramolybdate is 99.6%, the purity of the citric acid is analytically pure, and the water is deionized water.
And 2, putting the mixed solution prepared in the step 1 into an ultrasonic atomizer, atomizing the mixed solution through the ultrasonic atomizer, blowing the atomized mixed solution into a tubular heating furnace through air, wherein the flow rate of the atomized mixed solution carried by the air is 20-40 m L/h, and obtaining the porous MoO2 photocatalyst microspheres at the outlet end of the tubular heating furnace.
As shown in fig. 2, the tube furnace has a working tube cavity, the inlet end of the working tube cavity has a tee, one end of the tee is introduced into the working tube cavity, the other end of the tee is connected with the output end of the ultrasonic atomizer, and the other end of the tee is connected with the air output end; a heating device is arranged outside the working tube cavity, the temperature of the middle position of the working tube cavity is 400-500 ℃, and the temperatures of the two ends are room temperature; the outlet end of the working tube cavity is a product outlet.
The technical solution of the invention is further described below by means of some examples, which are not to be understood as limiting the technical solution.
Example 1, 1.5mmol ammonium paramolybdate and 1mmol citric acid were weighed, dissolved in 10m L deionized water, magnetically stirred at room temperature for 1h, then the prepared solution was transferred to an ultrasonic atomizer, the temperature of the tube furnace was raised to 400 ℃ in advance, then the solution was ultrasonically sprayed into the tube furnace at a rate of 20m L/h, the whole sintering process was completed in air atmosphere without protective gas, and after sintering, furnace cooling was performed to obtain porous MoO2 photocatalyst microspheres with a diameter of about 1 μm.
FIG. 3(a) is an SEM image of MoO2 prepared at 400 ℃ and a magnified partial view of FIG. 3(a) is shown in FIG. 3 (c).
FIG. 4(a) shows a MoO2 vs methylene blue-light catalysis curve prepared at 400 ℃, and (B) shows a p-rhodamine B photocatalysis curve compared with that of commercial TiO 2.
Example 2, 2mmol ammonium paramolybdate and 2mmol citric acid were weighed, dissolved in 10m L deionized water, magnetically stirred at room temperature for 1h, then the prepared solution was transferred to an ultrasonic atomizer, the temperature of the tube furnace was raised to 400 ℃ in advance, then the solution was ultrasonically sprayed into the tube furnace at a rate of 30m L/h, the whole sintering process was completed in air atmosphere without protective gas, and after sintering, furnace cooling was performed to obtain porous MoO2 photocatalyst microspheres with a diameter of about 1.5 μm.
Example 3 weighing 2.5mmol ammonium paramolybdate and 3mmol citric acid respectively, dissolving them in 10m L deionized water, magnetically stirring for 1h at room temperature, then transferring the prepared solution to an ultrasonic atomizer, raising the temperature of a tubular furnace to 450 ℃ in advance, then ultrasonically atomizing the solution into the tubular furnace at a rate of 40m L/h, completing the whole sintering process in air atmosphere without protective gas, and cooling along with the furnace after sintering to obtain the porous MoO2 photocatalyst microspheres with the diameter of about 2 μm.
Example 4 weighing 1.5mmol ammonium paramolybdate and 1mmol citric acid respectively, dissolving them in 10m L deionized water, magnetically stirring for 1h at room temperature, then transferring the prepared solution to an ultrasonic atomizer, raising the temperature of a tubular furnace to 450 ℃ in advance, then ultrasonically atomizing the solution into the tubular furnace at a rate of 20m L/h, completing the whole sintering process in air atmosphere without protective gas, and cooling along with the furnace after sintering to obtain the porous MoO2 photocatalyst microspheres with the diameter of about 1 μm.
Example 5 weighing 2mmol ammonium paramolybdate and 2mmol citric acid respectively, dissolving them in 10m L deionized water, magnetically stirring for 1h at room temperature, then transferring the prepared solution to an ultrasonic sprayer, raising the temperature of a tube furnace to 500 ℃ in advance, then ultrasonically spraying the solution into the tube furnace at the speed of 30m L/h, completing the whole sintering process in air atmosphere without protective gas, and cooling along with the furnace after sintering to obtain the porous MoO2 photocatalyst microspheres with the diameter of about 1.5 μm.
FIG. 3(b) is an SEM image of MoO2 prepared at 500 deg.C, and a magnified partial view of FIG. 3(b) is shown in FIG. 3 (d). FIG. 4(a) shows a MoO2 vs methylene blue-light catalysis curve prepared at 500 deg.C, and (B) shows a p-rhodamine B photocatalysis curve compared with that of commercial TiO 2.
Example 6 weighing 2.5mmol ammonium paramolybdate and 3mmol citric acid respectively, dissolving them in 10m L deionized water, magnetically stirring for 1h at room temperature, then transferring the prepared solution to an ultrasonic atomizer, raising the temperature of a tubular furnace to 500 ℃ in advance, then ultrasonically atomizing the solution into the tubular furnace at a rate of 40m L/h, completing the whole sintering process in air atmosphere without protective gas, and cooling along with the furnace after sintering to obtain the porous MoO2 photocatalyst microspheres with a diameter of about 2 μm.
Claims (2)
1. Hierarchical porous MoO2Photocatalyst microspheres, characterized by: porous MoO2The photocatalyst microsphere consists of a porous shell and a reticular porous framework inside the shell;
porous MoO2The diameter of the photocatalyst microspheres is 1-2 mu m;
porous MoO2The diameter of the inner reticular porous pores of the photocatalyst microspheres is 50-200 nm;
porous MoO2The preparation method of the photocatalyst microspheres comprises the following steps:
step 1, preparing a solution, namely dissolving ammonium paramolybdate and citric acid into water to prepare a solution, wherein the water is 10m L, the ammonium paramolybdate is 1.5-2.5 mmol, and the citric acid is 1-3 mmol, wherein the purity of the ammonium paramolybdate is 99.6%, the purity of the citric acid is analytically pure, and the water is deionized water;
step 2, placing the mixed solution prepared in the step 1 into an ultrasonic atomizer, atomizing the mixed solution through the ultrasonic atomizer, blowing the atomized mixed solution into a tubular heating furnace through air, wherein the flow rate of the atomized mixed solution carried by the air is 20-40 m L/h, and obtaining the porous MoO at the outlet end of the tubular heating furnace2Photocatalyst microspheres;
the tube furnace is provided with a working tube cavity, the inlet end of the working tube cavity is provided with a tee joint, one end of the tee joint is introduced into the working tube cavity, the other end of the tee joint is connected with the output end of the ultrasonic atomizer, and the other end of the tee joint is connected with the air output end; a heating device is arranged outside the working tube cavity, the temperature of the middle position of the working tube cavity is 400-500 ℃, and the temperatures of the two ends are room temperature; the outlet end of the working tube cavity is a product outlet.
2. A method for preparing the hierarchical porous MoO of claim 12The preparation method of the photocatalyst microspheres is characterized by comprising the following steps: porous MoO2The preparation method of the photocatalyst microspheres comprises the following steps:
step 1, preparing a solution, namely dissolving ammonium paramolybdate and citric acid into water to prepare a solution, wherein the water is 10m L, the ammonium paramolybdate is 1.5-2.5 mmol, and the citric acid is 1-3 mmol, wherein the purity of the ammonium paramolybdate is 99.6%, the purity of the citric acid is analytically pure, and the water is deionized water;
step 2, placing the mixed solution prepared in the step 1 into an ultrasonic atomizer, atomizing the mixed solution through the ultrasonic atomizer, blowing the atomized mixed solution into a tubular heating furnace through air, wherein the flow rate of the atomized mixed solution carried by the air is 20-40 m L/h, and obtaining the porous MoO at the outlet end of the tubular heating furnace2Photocatalyst microspheres;
the tube furnace is provided with a working tube cavity, the inlet end of the working tube cavity is provided with a tee joint, one end of the tee joint is introduced into the working tube cavity, the other end of the tee joint is connected with the output end of the ultrasonic atomizer, and the other end of the tee joint is connected with the air output end; a heating device is arranged outside the working tube cavity, the temperature of the middle position of the working tube cavity is 400-500 ℃, and the temperatures of the two ends are room temperature; the outlet end of the working tube cavity is a product outlet.
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