CN112934224A - Gas/solid two-phase interface photocatalytic system based on carbonized wood and preparation and use method - Google Patents
Gas/solid two-phase interface photocatalytic system based on carbonized wood and preparation and use method Download PDFInfo
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- 239000002023 wood Substances 0.000 title claims abstract description 46
- 239000007787 solid Substances 0.000 title claims abstract description 37
- 230000001699 photocatalysis Effects 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000002360 preparation method Methods 0.000 title claims abstract description 12
- 239000001257 hydrogen Substances 0.000 claims abstract description 49
- 229910052739 hydrogen Inorganic materials 0.000 claims abstract description 49
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims abstract description 46
- 239000007789 gas Substances 0.000 claims abstract description 44
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 43
- 239000003054 catalyst Substances 0.000 claims abstract description 40
- 230000003197 catalytic effect Effects 0.000 claims abstract description 32
- 238000004519 manufacturing process Methods 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 16
- 239000011941 photocatalyst Substances 0.000 claims abstract description 14
- 238000004381 surface treatment Methods 0.000 claims abstract description 8
- 239000000969 carrier Substances 0.000 claims abstract description 6
- 239000000758 substrate Substances 0.000 claims abstract description 6
- 238000006243 chemical reaction Methods 0.000 claims description 23
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 16
- 239000006185 dispersion Substances 0.000 claims description 15
- KBPLFHHGFOOTCA-UHFFFAOYSA-N caprylic alcohol Natural products CCCCCCCCO KBPLFHHGFOOTCA-UHFFFAOYSA-N 0.000 claims description 12
- 238000010438 heat treatment Methods 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 10
- 239000010875 treated wood Substances 0.000 claims description 9
- 239000008367 deionised water Substances 0.000 claims description 8
- 229910021641 deionized water Inorganic materials 0.000 claims description 8
- 229940011182 cobalt acetate Drugs 0.000 claims description 6
- QAHREYKOYSIQPH-UHFFFAOYSA-L cobalt(II) acetate Chemical compound [Co+2].CC([O-])=O.CC([O-])=O QAHREYKOYSIQPH-UHFFFAOYSA-L 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 6
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 claims description 6
- 239000010453 quartz Substances 0.000 claims description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 238000004528 spin coating Methods 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 4
- 238000002156 mixing Methods 0.000 claims description 2
- 239000000203 mixture Substances 0.000 claims description 2
- 239000012071 phase Substances 0.000 abstract description 42
- 239000007791 liquid phase Substances 0.000 abstract description 9
- 238000005516 engineering process Methods 0.000 abstract description 4
- 238000007146 photocatalysis Methods 0.000 abstract description 4
- 238000009792 diffusion process Methods 0.000 abstract description 3
- 150000002431 hydrogen Chemical class 0.000 abstract description 3
- 230000008569 process Effects 0.000 abstract description 3
- 238000013032 photocatalytic reaction Methods 0.000 abstract description 2
- 238000001179 sorption measurement Methods 0.000 abstract description 2
- 238000005036 potential barrier Methods 0.000 abstract 1
- 238000009987 spinning Methods 0.000 abstract 1
- 238000012360 testing method Methods 0.000 description 12
- 238000004817 gas chromatography Methods 0.000 description 5
- 239000007790 solid phase Substances 0.000 description 5
- 239000000376 reactant Substances 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 238000004729 solvothermal method Methods 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 238000006479 redox reaction Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005457 optimization Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010406 interfacial reaction Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 230000005068 transpiration Effects 0.000 description 1
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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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/02—Impregnation, coating or precipitation
- B01J37/0215—Coating
-
- 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
- B01J23/70—Catalysts comprising metals or metal oxides or hydroxides, not provided for in group B01J21/00 of the iron group metals or copper
- B01J23/74—Iron group metals
- B01J23/75—Cobalt
-
- B01J35/39—
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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
- B01J37/00—Processes, in general, for preparing catalysts; Processes, in general, for activation of catalysts
- B01J37/08—Heat treatment
- B01J37/082—Decomposition and pyrolysis
- B01J37/084—Decomposition of carbon-containing compounds into carbon
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
- C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
- C01B3/04—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by decomposition of inorganic compounds, e.g. ammonia
- C01B3/042—Decomposition of water
- C01B3/045—Decomposition of water in gaseous phase
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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
- 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
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Abstract
The invention relates to a gas/solid two-phase interface photocatalysis system and a preparation and use method thereof, wood with surface treatment is used as a substrate for converting liquid phase water into water vapor, a CoO photocatalyst is coated on the surface of carbonized wood in a spinning way, the carbonized wood of the substrate generates water vapor under the irradiation of light and coats the surface of the photocatalyst, the catalyst is excited by light to generate carriers, the water vapor is further decomposed into hydrogen, and the hydrogen production rate reaches 5776 mu mol/h/g. Has the advantages of simple process, wide material source and economy. In addition, the gas/solid two-phase interface photocatalytic reaction can reduce the adsorption potential barrier of water molecules on the surface of the catalyst, reduce the diffusion resistance of the product hydrogen and improve the hydrogen escape and collection efficiency, thereby obviously improving the photocatalytic hydrogen production rate. The whole gas/solid two-phase interface photocatalytic system is simple and convenient in preparation process, and the cost is greatly reduced. The two-phase catalytic system can further promote the wide application of the technology for preparing hydrogen by photocatalysis.
Description
Technical Field
The invention belongs to the field of photocatalytic hydrogen production, and relates to a gas/solid two-phase interface photocatalytic system based on carbonized wood and a preparation and use method thereof.
Background
Photocatalytic hydrogen production is a potential technical means for dealing with energy crisis at present; meanwhile, the prepared hydrogen energy is green clean energy and is beneficial to relieving the problems of environmental pollution and the like. At present, the common photocatalytic hydrogen production is generally that catalyst powder is dispersed in water, a catalyst material is excited under illumination, and generated photon-generated carriers and water molecules perform oxidation-reduction reaction to generate hydrogen. Currently, the optimization of the photocatalytic hydrogen production technology mostly focuses on the photoelectric property optimization of the catalyst material, such as the improvement of the optical absorption capacity, carrier separation and migration capacity and the like of the catalyst material. However, the photocatalytic hydrogen production reaction is an interfacial reaction, i.e., solid phase catalyst material/liquid phase reactant water/gas phase product hydrogen. The reaction barrier of the liquid phase reactant water adsorbed on the surface of the solid phase catalyst material is large, which is not beneficial to the subsequent oxidation-reduction reaction. In addition, the generated hydrogen has large diffusion resistance in liquid phase reactant water, and the hydrogen is influenced to escape and collect. Due to the two reasons, the hydrogen production rate of the three-phase catalytic system is not good. Based on the problem, the system firstly introduces carbonized wood as a matrix, and induces water vapor under the condition of light radiation, so that the carbonized wood is coated on the surface of a catalyst on the surface of the wood, and gas-phase water vapor is introduced, so that the reaction barrier of liquid-phase reactant water adsorbed on the surface of a solid-phase catalyst material is large, and the major problem that the subsequent oxidation-reduction reaction is not facilitated is solved.
Disclosure of Invention
Technical problem to be solved
In order to avoid the defects of the prior art, the invention provides a gas/solid two-phase interface photocatalytic system based on carbonized wood and a preparation and use method thereof, which are used for regulating and controlling a macroscopic interface of a photocatalytic hydrogen production reaction, and gas-phase vapor is used for replacing liquid-phase water to prepare the two-phase interface photocatalytic system. The wood is subjected to surface treatment, and the conversion from liquid-phase water to gas-phase water is realized by utilizing the capillary photothermal effect and the transpiration effect of the wood. The catalyst dispersion is firstly coated on the surface of the wood treated by the surface treatment by spin coating, and the catalyst material is coated by the generated water vapor to form a gas/solid two-phase interface. Gaseous water is adsorbed on the surface of the solid-phase catalyst, and simultaneously, the solid-phase catalyst material is excited by illumination to generate carriers to participate in the catalytic hydrogen production reaction. The reaction system shows high catalytic hydrogen production performance. Meanwhile, the preparation process is simple and convenient, and the cost is greatly reduced. The wide application of the technology for preparing hydrogen by photocatalysis can be further promoted.
Technical scheme
A gas/solid two-phase interface photocatalytic system based on carbonized wood is characterized by comprising carbonized wood and a CoO photocatalyst; the surface of the carbonized wood is provided with a CoO photocatalyst.
A preparation method of the gas/solid two-phase interface photocatalytic system based on carbonized wood is characterized by comprising the following steps:
step 2: dispersing a CoO catalyst material in deionized water to obtain a dispersion liquid with the concentration of 0.1-0.5M; and spin-coating the dispersion liquid on the surface of the treated wood, and then placing the treated wood in an oven for drying to obtain the gas/solid two-phase catalytic system.
The wood surface treatment is to heat the wood surface for 1-3 min under flame.
The spin coating speed of the dispersion liquid in the step 2 is 500-1000 rpm, and the time is 20-40 s.
The drying temperature of the step 2 is 45 ℃.
The preparation of the CoO photocatalyst comprises the following steps: mixing 2g of cobalt acetate, 8ml of n-octanol and 32ml of ethanol, and transferring the mixture into a 50ml hydrothermal kettle; and (3) reacting for 6-9 h at 200 ℃, and then placing the centrifugal product subjected to centrifugal treatment in a quartz tube for heating reaction. The tube furnace is heated to 600 ℃ from the room temperature for 3 hours; and then preserving heat for 5-7 h, and naturally cooling to obtain the catalyst CoO.
The rotating speed of the centrifugal treatment is 5500-7000 rpm, and the time is 5-10 min.
A method for preparing hydrogen by utilizing the gas/solid two-phase interface photocatalytic system based on carbonized wood is characterized in that: the gas/solid two-phase interface photocatalytic system is placed in a catalytic reactor, sunlight is used as a light source, carbonized wood on a substrate generates water vapor and coats the surface of the photocatalyst, and the catalyst is excited by light to generate carriers to decompose the water vapor into hydrogen.
And (3) testing the catalytic hydrogen production performance of a gas/solid two-phase catalytic system: the wood catalyst composite material prepared under different reaction conditions is placed in a catalytic reactor, and AM 1.5G simulated sunlight is used as a light source. And introducing the product gas into the gas chromatography for hydrogen yield calibration through an automatic sample introduction device of the test system. The traditional three-phase system test is that 38mg of CoO photocatalyst is directly dissolved in 50ml of deionized water, AM 1.5G simulated sunlight is used as a light source, and product gas is introduced into a gas chromatograph for hydrogen yield calibration through an automatic sample introduction device of a test system.
Advantageous effects
The invention provides a gas/solid two-phase interface photocatalytic system based on carbonized wood and a preparation and use method thereof, which adopts wood with surface treatment as a substrate for converting liquid-phase water into water vapor, a CoO photocatalyst is coated on the surface of the carbonized wood in a rotating way, the carbonized wood of the substrate generates water vapor under the irradiation of light and is coated on the surface of the photocatalyst, the catalyst is excited by light to generate carriers, the water vapor is further decomposed into hydrogen, the hydrogen production rate can reach 5776 mu mol/h/g, and the performance of the spin coating process of the catalyst can reach the best by adjusting parameters such as rotating speed, content and the like (detailed parameter regulation and control are shown in an example part). In the traditional three-phase system, the CoO photocatalyst is directly dissolved in deionized water, and liquid phase water is decomposed into hydrogen under illumination, wherein the hydrogen production rate is only 321 mu mol/h/g (figure 3). The gas/solid two-phase interface photocatalytic system has the advantages of simple process, wide material source and economy. In addition, the gas/solid two-phase interface photocatalytic reaction is different from the traditional three-phase interface reaction, not only can reduce the adsorption barrier of water molecules on the surface of a catalyst, but also can reduce the diffusion resistance of the product hydrogen, and improve the hydrogen escape and collection efficiency, thereby obviously improving the photocatalytic hydrogen production rate. The whole gas/solid two-phase interface photocatalytic system is simple and convenient in preparation process, and the cost is greatly reduced. The two-phase catalytic system can further promote the wide application of the technology for preparing hydrogen by photocatalysis.
Drawings
FIG. 1: surface treated wood produces water vapor physical map
FIG. 2: scanning electron microscope image of gas/solid two-phase interface photocatalytic system with scale of 1 μm
FIG. 3: hydrogen production rate of gas/solid two-phase interface photocatalytic system
Detailed Description
The invention will now be further described with reference to the following examples and drawings:
the first embodiment is as follows:
heating wood surface under alcohol flame for 1min, and rapidly soaking in cold water for 5 min. Then 2g of cobalt acetate is taken, evenly mixed with 8ml of n-octanol and 32ml of ethanol, and transferred into a 50ml hydrothermal kettle. The reaction is carried out for 6h at 200 ℃. After the solvothermal reaction is finished, centrifuging at 7000rpm for 5 min. And then placing the centrifugal product in a quartz tube for heating reaction. The tube furnace is heated to 600 ℃ from the room temperature for 3 hours; then the temperature is kept for 7h, and then the catalyst CoO is obtained after natural cooling. Dispersing the prepared CoO catalyst material in deionized water to obtain a dispersion liquid with the concentration of 0.2M; the dispersion was spin coated onto the treated wood surface at 600rpm for 30 seconds. Then the catalyst is placed in an oven to be dried (the temperature in the oven is set to be 45 ℃), and a gas/solid two-phase catalyst system can be obtained.
And (3) testing the catalytic hydrogen production performance of a gas/solid two-phase catalytic system: a gas/solid two-phase catalytic system prepared under different reaction conditions is placed in a catalytic reactor, and AM 1.5G simulated sunlight is used as a light source. And introducing the product gas into the gas chromatography for hydrogen yield calibration through an automatic sample introduction device of the test system. The catalytic hydrogen production rate is 4677 mu mol/h/g.
Example two:
heating wood surface under alcohol flame for 2min, and rapidly soaking in cold water for 4 min. Then 2g of cobalt acetate is taken, evenly mixed with 8ml of n-octanol and 32ml of ethanol, and transferred into a 50ml hydrothermal kettle. The reaction is carried out for 8h at 200 ℃. After the solvothermal reaction is finished, centrifuging at the rotating speed of 6000rpm for 7 min. And then placing the centrifugal product in a quartz tube for heating reaction. The tube furnace is heated to 600 ℃ from the room temperature for 3 hours; then the temperature is kept for 6h, and then the catalyst CoO is obtained after natural cooling. Dispersing the prepared CoO catalyst material in deionized water to obtain a dispersion liquid with the concentration of 0.3M; the dispersion was spin coated onto the treated wood surface at 700rpm for 30 s. Then the catalyst is placed in an oven to be dried (the temperature in the oven is set to be 45 ℃), and a gas/solid two-phase catalyst system can be obtained.
And (3) testing the catalytic hydrogen production performance of a gas/solid two-phase catalytic system: a gas/solid two-phase catalytic system prepared under different reaction conditions is placed in a catalytic reactor, and AM 1.5G simulated sunlight is used as a light source. And introducing the product gas into the gas chromatography for hydrogen yield calibration through an automatic sample introduction device of the test system. The catalytic hydrogen production rate is 4896 mu mol/h/g.
Example three:
heating wood surface under alcohol flame for 3min, and rapidly soaking in cold water for 2 min. Then 2g of cobalt acetate is taken, evenly mixed with 8ml of n-octanol and 32ml of ethanol, and transferred into a 50ml hydrothermal kettle. The reaction is carried out for 6h at 200 ℃. After the solvothermal reaction is finished, centrifuging at the rotating speed of 5500rpm for 5 min. And then placing the centrifugal product in a quartz tube for heating reaction. The tube furnace is heated to 600 ℃ from the room temperature for 3 hours; then the temperature is kept for 5 h, and then the catalyst CoO is obtained after natural cooling. Dispersing the prepared CoO catalyst material in deionized water to obtain a dispersion liquid with the concentration of 0.1M; the dispersion was spin coated onto the treated wood surface at 500rpm for 20 s. Then the catalyst is placed in an oven to be dried (the temperature in the oven is set to be 45 ℃), and a gas/solid two-phase catalyst system can be obtained.
And (3) testing the catalytic hydrogen production performance of a gas/solid two-phase catalytic system: a gas/solid two-phase catalytic system prepared under different reaction conditions is placed in a catalytic reactor, and AM 1.5G simulated sunlight is used as a light source. And introducing the product gas into the gas chromatography for hydrogen yield calibration through an automatic sample introduction device of the test system. The catalytic hydrogen production rate is 5776 mu mol/h/g.
Example four:
heating wood surface under alcohol flame for 3min, and rapidly soaking in cold water for 5 min. Then 2g of cobalt acetate is taken, evenly mixed with 8ml of n-octanol and 32ml of ethanol, and transferred into a 50ml hydrothermal kettle. The reaction was carried out at 200 ℃ for 9 h. After the solvothermal reaction is finished, centrifuging at 7000rpm for 10 min. And then placing the centrifugal product in a quartz tube for heating reaction. The tube furnace is heated to 600 ℃ from the room temperature for 3 hours; then the temperature is kept for 7h, and then the catalyst CoO is obtained after natural cooling. Dispersing the prepared CoO catalyst material in deionized water to obtain a dispersion liquid with the concentration of 0.5M; the dispersion was spin coated onto the treated wood surface at 1000rpm for 40 s. Then the catalyst is placed in an oven to be dried (the temperature in the oven is set to be 45 ℃), and a gas/solid two-phase catalyst system can be obtained.
And (3) testing the catalytic hydrogen production performance of a gas/solid two-phase catalytic system: a gas/solid two-phase catalytic system prepared under different reaction conditions is placed in a catalytic reactor, and AM 1.5G simulated sunlight is used as a light source. And introducing the product gas into the gas chromatography for hydrogen yield calibration through an automatic sample introduction device of the test system. The catalytic hydrogen production rate is 5033 mu mol/h/g.
Claims (8)
1. A gas/solid two-phase interface photocatalytic system based on carbonized wood is characterized by comprising carbonized wood and a CoO photocatalyst; the surface of the carbonized wood is provided with a CoO photocatalyst.
2. A method for preparing a gas/solid two-phase interface photocatalytic system based on carbonized wood as claimed in claim 1, characterized by the steps of:
step 1, wood surface treatment: heating the surface of the wood under flame to form carbonized wood, and immediately immersing the carbonized wood into cold water for 2-5 min;
step 2: dispersing a CoO catalyst material in deionized water to obtain a dispersion liquid with the concentration of 0.1-0.5M; and spin-coating the dispersion liquid on the surface of the treated wood, and then placing the treated wood in an oven for drying to obtain the gas/solid two-phase catalytic system.
3. The method of claim 2, wherein: the wood surface treatment is to heat the wood surface for 1-3 min under flame.
4. The method of claim 2, wherein: the spin coating speed of the dispersion liquid in the step 2 is 500-1000 rpm, and the time is 20-40 s.
5. The method of claim 2, wherein: the drying temperature of the step 2 is 45 ℃.
6. The method of claim 2, wherein: the preparation of the CoO photocatalyst comprises the following steps: mixing 2g of cobalt acetate, 8ml of n-octanol and 32ml of ethanol, and transferring the mixture into a 50ml hydrothermal kettle; and (3) reacting for 6-9 h at 200 ℃, and then placing the centrifugal product subjected to centrifugal treatment in a quartz tube for heating reaction. The tube furnace is heated to 600 ℃ from the room temperature for 3 hours; and then preserving heat for 5-7 h, and naturally cooling to obtain the catalyst CoO.
7. The method of claim 6, wherein: the rotating speed of the centrifugal treatment is 5500-7000 rpm, and the time is 5-10 min.
8. A method for producing hydrogen using the carbonized wood based gas/solid two-phase interface photocatalytic system of claim 1, characterized in that: the gas/solid two-phase interface photocatalytic system is placed in a catalytic reactor, sunlight is used as a light source, carbonized wood on a substrate generates water vapor and coats the surface of the photocatalyst, and the catalyst is excited by light to generate carriers to decompose the water vapor into hydrogen.
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