Preparation method of full-spectrum-response plasmon photocatalyst for reducing carbon dioxide to prepare methane

Abstract

The invention discloses a preparation method of a full-spectrum response plasmon photocatalyst for reducing carbon dioxide to prepare methane, and belongs to the technical field of photocatalytic reduction of CO2. Tungsten hexacarbonyl and silver nitrate, nickel chloride or chloroauric acid are used as raw materials, and a solvothermal reaction is performed to obtain a plasmon W18O49 nanowire photocatalyst doped with different metal ions. According to the preparation method for preparing the CH4 plasmon photocatalyst through full-spectrum response CO2 reduction, the prepared Au, Ag or N metal ion doped plasmon W18O49 nanowires have high ultraviolet-visible-near infrared light absorption capacity and rich surface oxygen vacancy concentration, adsorption and activation of CO2 molecules are facilitated, meanwhile, the surface oxygen vacancy concentration is increased, and meanwhile, the surface oxygen vacancy concentration is increased. The surface of the catalyst can effectively stabilize a * CO intermediate generated in the photocatalytic CO2 reduction process, and the performance and selectivity of the original plasmon W18O49 for preparing CH4 through photocatalytic CO2 reduction are remarkably improved.

Description

Technical Field

[0001] The present invention relates to photocatalytic reduction of CO 2 technical field, and in particular to a preparation method of a plasmon photocatalyst for reducing carbon dioxide to methane with full-spectrum response. Background Art

[0002] With the acceleration of the industrialization process, the dependence on and consumption of fossil fuels by humans have been continuously increasing, resulting in a sharp rise in the concentration of CO 2 in the atmosphere, thus exacerbating global warming and climate change. As a major greenhouse gas, the reduction and resource utilization of CO 2 have become hot issues of global concern.

[0003] Among various CO 2 resource utilization technologies, photocatalytic CO 2 reduction technology uses solar energy as the driving energy and does not require additional electrical input, which is a completely green energy conversion method. In addition, photocatalytic CO 2 reduction is usually carried out at normal temperature and pressure without harsh reaction conditions, reducing energy consumption and equipment requirements. Photocatalytic CO 2 reduction technology can not only reduce greenhouse gas emissions, but also convert CO 2 into high-value-added fuels (such as CH 4 ), alleviating the current energy shortage problem. However, due to the high CO 2 activation energy barrier and multi-step proton-coupled electron transfer process, achieving photocatalytic CO 2 directed reduction to CH 4 still faces some challenges.

[0004] Currently, non-metallic plasmonic W 18 O 49 semiconductor materials have been proven to be effective in photocatalytic reduction of CO 2 to fuel due to their characteristics of full-spectrum absorption, abundant surface oxygen vacancies, and abundant surface plasmon hot carriers. However, due to the lack of stable * active sites for CO intermediates on their surfaces, their photocatalytic CO 2 reduction performance and selectivity for directed production of CH 4 are still insufficient, and it is urgent to construct active sites on the catalyst surface to enhance the photocatalytic CO 2 reduction performance and selectivity for CH 4 production. Summary of the Invention

[0005] The purpose of the present invention is to provide a preparation method of a plasmon photocatalyst for reducing carbon dioxide to methane with full-spectrum response, and enhance *The stable adsorption of CO intermediates can regulate its photocatalytic CO 2 reduction selectivity to achieve efficient and highly selective preparation of CH 4 .

[0006] To achieve the above object, in the first aspect of the present invention, a preparation method of a plasmon photocatalyst for reducing carbon dioxide to methane with full-spectrum response is provided. Tungsten hexacarbonyl and a doped metal salt are dissolved in absolute ethanol, and a plasmonic W 18 O 49 nanowire photocatalyst doped with metal ions is prepared by a solvothermal reaction; the doped metal salt is selected from at least one of silver nitrate, nickel chloride or chloroauric acid.

[0007] Preferably, in the above preparation method of a plasmon photocatalyst for reducing carbon dioxide to methane with full-spectrum response, the purities of tungsten hexacarbonyl, silver nitrate, nickel chloride, and chloroauric acid are all greater than 99%; the concentration of tungsten hexacarbonyl in absolute ethanol is 5-10 mg / mL.

[0008] Preferably, in the above preparation method of a plasmon photocatalyst for reducing carbon dioxide to methane with full-spectrum response, the mass percentage of the metal ions in the doped metal salt to the final product W 18 O 49 is 0.15% to 1.4%.

[0009] Preferably, in the above preparation method of a plasmon photocatalyst for reducing carbon dioxide to methane with full-spectrum response, the temperature of the solvothermal reaction is 160-190 °C, and the hydrothermal time is 12-24 hours.

[0010] In the second aspect of the present invention, a plasmonic W 18 O 49 photocatalyst doped with metal ions obtained by the above preparation method is provided.

[0011] In the third aspect of the present invention, the application of the prepared plasmonic W 18 O 49 photocatalyst doped with metal ions in photocatalytic CO 2 reduction to prepare CH 4 is provided.

[0012] Preferably, the specific method of the plasmonic W 18 O 49 photocatalyst in photocatalytic CO 2 reduction to prepare CH 4 is as follows: The non-metallic plasmonic W 18 O 49The photocatalyst was dispersed in deionized water, and the dispersed suspension was coated on a glass slide and dried under the irradiation of an infrared lamp. Then, the glass slide was placed in a photocatalytic reactor and sealed with a thick quartz cover. The entire reactor was purged with high-purity nitrogen to remove air. Before the reaction, high-purity CO 2 gas was filled into the reactor, and a small amount of deionized water was added to the bottom of the reactor. The reduction experiment of CO 2 was carried out using a xenon lamp as the simulated sunlight for illumination.

[0013] Preferably, in the above-mentioned application of the plasmonic W 18 O 49 photocatalyst in the photocatalytic reduction of CO 2 to prepare CH 4 , the dosage of the photocatalyst is 5 mg, the dosage of the deionized water is 0.4 mL, and the area of the glass slide is 9.61 cm 2 .

[0014] Preferably, in the above-mentioned application of the plasmonic W 18 O 49 photocatalyst in the photocatalytic reduction of CO 2 to prepare CH 4 , the volume of the photocatalytic reactor is 180 mL, the power of the infrared lamp is 150 W, and the drying time is 10 minutes. The wavelength range of the xenon lamp simulating sunlight is 200 - 1100 nm, and the light intensity is 150 - 300 mW / cm 2 , and more preferably, the light intensity is 200 mW / cm 2 .

[0015] Preferably, in the above-mentioned application of the plasmonic W 18 O 49 photocatalyst in the photocatalytic reduction of CO 2 to prepare CH 4 , the purging time of the high-purity nitrogen is 20 min, the blowing and filling time of the high-purity CO 2 is 20 min, and the dosage of the deionized water added to the bottom of the reactor is 0.2 mL.

[0016] Therefore, the present invention adopts the preparation method of a plasmonic photocatalyst for the reduction of carbon dioxide to methane with full-spectrum response having the above structure. Using tungsten hexacarbonyl and silver nitrate, nickel chloride or chloroauric acid as raw materials, a non-metallic plasmonic W 18 O 49 nanowire photocatalyst doped with different metal ions is prepared by a solvothermal reaction in an ethanol solution. The prepared non-metallic plasmonic W 18 O 49Nanowires have full spectrum absorption from UV to visible to near infrared, which is superior to most reported semiconductor photocatalytic materials. The surface of the photocatalyst has abundant oxygen vacancies, which is beneficial to CO 2 The adsorption and activation of molecules, at the same time, the high-energy hot electrons and holes generated by its surface plasmon resonance effect are beneficial to the photocatalytic CO 2 Reduction reaction; doping with Au, Ag or Ni metal ions can effectively stabilize the photocatalytic CO 2 During the restoration process * CO intermediates, regulating non-metallic plasmon W 18 O 49 Nanowire photocatalysis of CO 2 Reduction selectivity, improving CH 4 The photocatalytic CO 2 The restoration process uses only H 2 O is used as an electron donor, thus avoiding the waste of organic sacrificial agents and causing no pollution to the environment. In addition, the catalyst preparation method of the present invention is simple, and the research content involved conforms to the current concept of sustainable development and has potential application prospects.

[0017] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 W 18 O 49 W doped with Au, Ag and Ni metal ions 18 O 49 X-ray diffraction pattern of

[0019] Figure 2 W 18 O 49 W doped with Au, Ag and Ni metal ions 18 O 49 UV-Vis-NIR diffuse reflectance spectrum;

[0020] Figure 3 W 18 O 49 W doped with Au, Ag and Ni metal ions 18 O 49 Transmission electron micrograph of

[0021] Figure 4 For photocatalytic CO 2 The structure diagram of the device for reduction reaction;

[0022] Figure 5 The synthesized samples photocatalyzed CO 2 During the reduction process, CH4 Graph of production varying with time;

[0023] Figure 6 For the photocatalytic CO of the synthesized sample 2 Graph of CO production varying with time during the reduction process;

[0024] Figure 7 For the photocatalytic CO of the synthesized sample 2 during the reduction process of CH 4 and the yields of CO and the selectivity of CH 4 production. Specific implementation manners

[0025] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the accompanying drawings of the specification and specific implementation manners. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present invention.

[0026] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "the" and "said" used in the embodiments of the present invention and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise. "Plurality" generally includes at least two.

[0027] It should also be noted that the term "comprises", "comprising" or any other variation thereof is intended to cover a non-exclusive inclusion, such that a commodity or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such commodity or device. Without further limitation, an element defined by the phrase "comprising a..." does not exclude the presence of additional identical elements in the commodity or device comprising said element.

[0028] The first aspect of the present invention provides a preparation method of a plasmonic photocatalyst for reducing carbon dioxide to methane with full-spectrum response. Tungsten hexacarbonyl and a doped metal salt are dissolved in absolute ethanol, and a metal ion-doped plasmonic W 18 O 49 nanowire photocatalyst is prepared by a solvothermal reaction; the doped metal salt is selected from at least one of silver nitrate, nickel chloride or chloroauric acid.

[0029] To further optimize the above technical solutions, the purities of tungsten hexacarbonyl, silver nitrate, nickel chloride, and chloroauric acid are all greater than 99%; the concentration of tungsten hexacarbonyl in absolute ethanol is 5 - 10 mg / mL.

[0030] To further optimize the above technical solution, the mass percentage of the metal ions in the doped metal salt and the final product WO is 0.15% to 1.4%. 18 O 49

[0031] To further optimize the above technical solution, the temperature of the solvothermal reaction is 160 - 190 °C, and the hydrothermal time is 12 - 24 hours.

[0032] The second aspect of the present invention provides a metal ion-doped plasmonic WO photocatalyst obtained by the above preparation method. 18 O 49

[0033] The third aspect of the present invention provides the application of the prepared metal ion-doped plasmonic WO photocatalyst in photocatalytic CO reduction to prepare CH. 18 O 49 2 4

[0034] To further optimize the above technical solution, the specific method of the plasmonic WO photocatalyst in photocatalytic CO reduction to prepare CH is as follows: Disperse the metal ion-doped non-metallic plasmonic WO photocatalyst in deionized water, coat the dispersed suspension on a glass slide and dry it under the irradiation of an infrared lamp, then place the glass slide in a photocatalytic reactor and seal it with a thick quartz cover; Purge the entire reactor with high-purity nitrogen to remove air. Before the reaction, fill high-purity CO gas into the reactor and add a small amount of deionized water to the bottom of the reactor; Use a xenon lamp as a simulated sunlight for the photocatalytic CO reduction experiment. 18 O 49 2 4 18 O 49 2 2

[0035] To further optimize the above technical solution, the dosage of the photocatalyst is 5 mg, the dosage of the deionized water is 0.4 mL, and the area of the glass slide is 9.61 cm. 2

[0036] To further optimize the above technical solution, the volume of the photocatalytic reactor is 180 mL, the power of the infrared lamp is 150 W, and the drying time is 10 minutes; The wavelength range of the xenon lamp simulating sunlight is 200 - 1100 nm, and the light intensity is 150 - 300 mW / cm, and more preferably, the light intensity is 200 mW / cm. 2 2

[0037] ​​​​​​​​​​​​​​To further optimize the above technical solution, the purging time of high-purity nitrogen is 20 min, and the purging and filling time of high-purity CO 2 is 20 min. The dosage of deionized water added to the bottom of the reactor is 0.2 mL.

[0038] To describe in more detail the preparation method of a plasmonic photocatalyst for carbon dioxide reduction to methane with full-spectrum response provided by the embodiments of the present invention, the following will be described in combination with specific embodiments.

[0039] Example 1

[0040] Preparation of plasmonic W 18 O 49 nanowires

[0041] 180 mg of tungsten hexacarbonyl powder was fully dissolved in 30 mL of absolute ethanol under vigorous stirring, and stirring was continued for 10 minutes. Subsequently, the precursor solution was transferred to a 50 mL stainless steel autoclave with a polytetrafluoroethylene liner and subjected to solvothermal reaction at 180 °C for 24 hours. After the reaction, it was cooled to room temperature, and the synthesized plasmonic W 18 O 49 catalyst was centrifuged out, washed with ethanol multiple times, and dried in an oven at 65 °C for 2.5 hours to obtain plasmonic W 18 O 49 nanowires.

[0042] Example 2

[0043] Preparation of plasmonic W 18 O 49 nanowires doped with Au, Ag or Ni ions

[0044] 180 mg of tungsten hexacarbonyl powder was fully dissolved in 25 mL of absolute ethanol under vigorous stirring. Additionally, 1.248 mg of chloroauric acid (or 0.571 mg of silver nitrate, or 0.899 mg of nickel chloride) was dissolved in 5 mL of absolute ethanol. After mixing the two evenly, stirring was continued for 10 minutes. Subsequently, the precursor solution was transferred to a 50 mL stainless steel autoclave with a polytetrafluoroethylene liner and subjected to solvothermal reaction at 180 °C for 24 hours. After the reaction, it was cooled to room temperature, and the synthesized plasmonic W 18 O 49 catalyst was centrifuged out, washed with ethanol multiple times, and dried in an oven at 65 °C for 2.5 hours to obtain plasmonic W 18 O 49 nanowires doped with Au, Ag or Ni ions (named Au 0.7 -W 18 O 49 , Ag 0.35 -W18 O 49 or Ni 0.35 -W 18 O 49 )。

[0045] For the synthesized plasmonic W 18 O 49 nanowires or plasmonic W doped with Au, Ag, and Ni ions 18 O 49 nanowires, X-ray diffraction analysis was carried out. As Figure 1 shown, the synthesized plasmonic W 18 O 49 and plasmonic W doped with Au, Ag, and Ni ions 18 O 49 have good crystallinity, and the standard diffraction pattern corresponding to W 18 O 49 is JCPDS:71-2450. The diffraction peak at around 23° corresponds to the (010) crystal plane of W 18 O 49 , and the doping of Au, Ag, and Ni metal ions will reduce the diffraction intensity of the (010) crystal plane, indicating that Au 0.7 -W 18 O 49 , Ag 0.35 -W 18 O 49 or Ni 0.35 -W 18 O 49 samples have a slightly decreased crystallinity. The lattice structure of W doped with metal elements 18 O 49 is basically the same as that of the original W 18 O 49 , but the (010) crystal plane will shift slightly to a higher angle, which is caused by the change in the lattice constant of W 18 O 49 due to the doping of metal elements.

[0046] For the synthesized plasmonic W 18 O 49 nanowires or plasmonic W doped with Au, Ag, and Ni ions 18 O 49 nanowires, ultraviolet-visible-near-infrared diffuse reflectance spectroscopy analysis was carried out. As Figure 2 shown, the prepared W 18 O 49 , Au 0.7 -W 18 O 49 , Ag 0.35 -W 18 O49 and Ni 0.35 -W 18 O 49 Except for showing the semiconductor absorption of the present certificate, all the samples exhibited surface plasmon resonance absorption peaks, showing the absorption characteristics of the ultraviolet-visible-near-infrared full spectrum. However, Au 0.7 -W 18 O 49 , Ag 0.35 -W 18 O 49 and Ni 0.35 -W 18 O 49 The light absorption of the sample decreased slightly, which may be due to the decrease in crystallinity.

[0047] Characterize the synthesized plasmonic W 18 O 49 nanowires or plasmonic W doped with Au, Ag, and Ni ions 18 O 49 nanowires by transmission electron microscopy. As Figure 3 shown, the prepared plasmonic W 18 O 49 or plasmonic W doped with Au, Ag, and Ni ions 18 O 49 all exhibited the morphology of nanowires, indicating that the doping of metal ions had little effect on the morphology of W 18 O 49 . The obtained nanowires had a diameter of about 8-15 nanometers and a length of about 0.2-1 micrometer.

[0048] Example 3

[0049] Plasmonic W with full-spectrum response 18 O 49 , Au 0.7 -W 18 O 49 , Ag 0.35 -W 18 O 49 and Ni 0.35 -W 18 O 49 Application of samples in photocatalytic CO 2 reduction

[0050] As Figure 4 shown, a cylindrical reactor with a volume of 180 mL and a quartz top cover was used as the reaction device for photocatalytic CO 2 reduction, and the reaction temperature was controlled at 25 °C through the inflow and outflow of circulating cooling water in the reactor. The top was the direction of light irradiation, and the catalyst was placed at the bottom of the reactor.

[0051] Weigh 5 mg of the plasmonic W 18 O 49 、Au 0.7 -W 18 O 49 、Ag 0.35 -W 18 O 49 or Ni 0.35 -W 18 O 49 photocatalyst, add 0.4 mL of deionized water, and obtain a uniform catalyst dispersion through 5 minutes of ultrasonic dispersion treatment. Drop the catalyst dispersion evenly onto a circular glass sheet with an area of 9.61 cm 2 , and dry it under the irradiation of an infrared lamp with a power of 150 W for 10 minutes to obtain a film with a uniformly coated photocatalyst. Place the film with the uniformly coated photocatalyst at the bottom of the reactor, cover it with a quartz top cover, purge the reactor with high-purity nitrogen for 20 minutes to remove the air therein, and then fill the reactor with high-purity CO 2 for 20 minutes as the reactant, and at the same time add 0.2 mL of deionized water at the bottom of the reactor as the proton source. Use a 300 W xenon lamp as the simulated sunlight light source, with a wavelength range of 200 - 1100 nm and a light intensity of 200 mW / cm 2 , and carry out the photocatalytic CO 2 reduction experiment by top irradiation, and the reaction products are detected and analyzed by gas chromatography every half hour.

[0052] The measured curves of the yields of the photocatalytic CO 2 reduction products carbon monoxide (CO) and CH 4 versus time are as shown in Figure 5 and Figure 6 . The plasmonic Au 0.7 -W 18 O 49 、Ag 0.35 -W 18 O 49 and Ni 0.35 -W 18 O 49 all show an increased CH 18 O 49 yield compared to the original W 4 O 0.7 -W 18 O 4 and Ni 0.35 -W 18 O 49 show a relative increase compared to the original W 18 O49 Reduced CO production rate. As Figure 7 shown, plasmonic W 18 O 49 , Au 0.7 -W 18 O 49 , Ag 0.35 -W 18 O 49 and Ni 0.35 -W 18 O 49 photocatalytic CO 2 reduction to CH 4 yields were 4.115, 8.534, 9.177, and 15.43 micromoles per gram per hour (μmol / g / h), respectively, and the photocatalytic CO 2 reduction to CO yields were 5.174, 3.572, 5.4, and 1.86 μmol / g / h, respectively. Plasmonic W 18 O 49 , Au 0.7 -W 18 O 49 , Ag 0.35 -W 18 O 49 and Ni 0.35 -W 18 O 49 photocatalytic CO 2 reduction to CH 4 selectivities were 44.28%, 70.49%, 62.56%, and 89.24%, respectively.

[0053] In summary, the present invention provides a photocatalytic CO 2 reduction to CH 4 catalyst, wherein the photocatalyst is a plasmonic W 18 O 49 nanowire doped with Au, Ag, or Ni metal ions, which has strong ultraviolet-visible-near-infrared light absorption ability and rich surface oxygen vacancy concentration, facilitating the adsorption and activation of CO 2 molecules. At the same time, the doping of Au, Ag, or Ni metal ions can effectively stabilize the 2 CO intermediates generated during the photocatalytic CO * reduction process, thereby promoting * the further hydrogenation of CO intermediates to prepare CH 4 . Therefore, plasmonic W 18 O 49 nanowires doped with Au, Ag, or Ni metal ions all exhibit 18 O 49Nanowires significantly improve photocatalytic CO 2 Reduction to CH 4 Performance and CH 4 Selectivity. The photocatalyst preparation method of the present invention is simple, the research content involved is in line with the current concept of sustainable development, and has potential application prospects.

[0054] Therefore, the present invention adopts a method for preparing a full-spectrum responsive carbon dioxide reduction to methane plasmon photocatalyst of the above structure, using tungsten hexacarbonyl and silver nitrate, nickel chloride or chloroauric acid as raw materials, and preparing non-metallic plasmon W doped with different metal ions by solvothermal reaction in an ethanol solution. 18 O 49 Nanowire photocatalysts. Prepared metal ion-doped non-metallic plasmon W 18 O 49 Nanowires have full spectrum absorption from UV to visible to near infrared, which is superior to most reported semiconductor photocatalytic materials. The surface of the photocatalyst has abundant oxygen vacancies, which is beneficial to CO 2 The adsorption and activation of molecules, at the same time, the high-energy hot electrons and holes generated by its surface plasmon resonance effect are beneficial to the photocatalytic CO 2 Reduction reaction; doping with Au, Ag or Ni metal ions can effectively stabilize the photocatalytic CO 2 During the restoration process * CO intermediates, regulating non-metallic plasmon W 18 O 49 Nanowire photocatalysis of CO 2 Reduction selectivity, improving CH 4 The photocatalytic CO 2 The restoration process uses only H 2 O is used as an electron donor, thus avoiding the waste of organic sacrificial agents and causing no pollution to the environment. In addition, the catalyst preparation method of the present invention is simple, and the research content involved conforms to the current concept of sustainable development and has potential application prospects.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that they can still modify or replace the technical solution of the present invention with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the present invention.

Claims

1. A method for preparing a plasmonic photocatalyst for reducing carbon dioxide to methane with full spectrum response, characterized in that: Tungsten hexacarbonyl and doped metal salts were dissolved in anhydrous ethanol, and metal ion-doped plasmon W was prepared by solvothermal reaction. 18 O 49 Nanowire photocatalyst; the doped metal salt is selected from at least one of silver nitrate, nickel chloride or chloroauric acid.

2. The method for preparing a plasmon photocatalyst for reducing carbon dioxide to methane with full spectrum response according to claim 1, characterized in that: The purity of the hexacarbonyl tungsten, silver nitrate, nickel chloride and chloroauric acid is greater than 99%; the metal ions in the doped metal salt and the final product W 18 O 49 The mass percentage is 0.15% to 1.4%.

3. The method for preparing a plasmon photocatalyst for reducing carbon dioxide to methane with full spectrum response according to claim 1, characterized in that: The concentration of the hexacarbonyl tungsten in anhydrous ethanol is 5-10 mg / mL; the temperature of the solvent thermal reaction is 160-190° C., and the hydrothermal time is 12-24 hours.

4. The metal ion-doped plasmon W obtained by the preparation method according to any one of claims 1 to 3 18 O 49 Photocatalyst.

5. The metal ion-doped plasmon W according to claim 4 18 O 49 Application of photocatalysts in photocatalytic reduction of CO2 to produce CH4.

6. The use according to claim 5, characterized in that: The specific method of photocatalytic CO2 reduction to produce CH4 is: metal ion-doped non-metallic plasmon W 18 O 49 The photocatalyst was dispersed in deionized water, and the dispersed suspension was coated on a glass sheet and dried under infrared light. The amount of the photocatalyst was 5 mg, the amount of deionized water was 0.4 mL, and the area of ​​the glass sheet was 9.61 cm 2 ; Then the glass sheet was placed in the photocatalytic reactor and sealed with a thick quartz cover; the entire reactor was purged with high-purity nitrogen to exclude air. Before the reaction, high-purity CO2 gas was filled into the reactor, and a small amount of deionized water was added to the bottom of the reactor; the purging time of the high-purity nitrogen was 20 minutes, the filling time of the high-purity CO2 was 20 minutes, and the amount of deionized water added to the bottom of the reactor was 0.2 mL; a xenon lamp was used to simulate sunlight for the light CO2 reduction experiment.

7. The use according to claim 6, characterized in that: The volume of the photocatalytic reactor is 180 mL, the power of the infrared lamp is 150 W, and the drying time is 10 minutes; the wavelength range of the xenon lamp simulating sunlight is 200-1100 nm, and the light intensity is 150-300 mW / cm 2 .

Images