Preparation method of photocatalyst with artificial photosynthesis

Abstract

The invention discloses a preparation method and application of a photocatalyst with artificial photosynthesis, and belongs to the technical field of photocatalyst preparation.The method comprises the steps that quantitative raw materials are weighed and placed in deionized water to be stirred to be fully dissolved, and the solution is transferred into a reaction kettle to react for 15-24 h at the temperature of 180 DEG C; and after the reaction is finished, centrifugally collecting a precipitation product, washing, and drying to obtain the sixth subgroup variable-valence metal oxide catalyst. The invention provides a novel photocatalyst capable of storing energy under the illumination condition and continuing to play a catalytic role in a dark environment, and after the variable valence metal oxide is used as a matrix and is modified by noble metal, not only is the electronic structure of the material optimized, but also effective transfer and storage of photo-induced electrons are promoted.

Description

Technical Field

[0001] The present invention relates to the technical field of photocatalyst preparation, and specifically relates to a method for preparing a photocatalyst with artificial photosynthesis and its application. Background Art

[0002] With the increasing severity of the global energy crisis and environmental problems, finding sustainable, clean and efficient energy conversion and storage technologies has become the focus of attention in the scientific research and industrial communities. The increase in CO 2 emissions has had a profound impact on the environment and has become one of the main driving factors of global climate change. Therefore, seeking effective methods to reduce CO 2 emissions and make reasonable use of it has become an important task for global scientific researchers.

[0003] In the prior art, the photocatalysis principle is based on the redox ability of photocatalysts under illumination conditions, so as to achieve the purposes of purifying pollutants, material synthesis and transformation, etc. It is considered to be a highly efficient technical method driven by light, with a simple use process and no secondary pollution. The greatest advantage of photocatalysis technology is that it can use solar energy to drive the catalytic reduction of carbon dioxide to achieve the purpose of reasonably using ecological resources and protecting the ecological environment.

[0004] Currently, although catalysts such as TiO 2 , Cu 2 O have been widely reported and studied, their activity and selectivity still need to be further improved. Especially, since the lifetime of photo-generated electrons is usually in the range from sub-picoseconds to seconds, the photocatalytic reaction will stop rapidly after the illumination ends. Affected by the sunshine duration and weather, the asynchrony between solar energy supply and utilization demand is a major obstacle to the practical application of CO 2 photoreduction technology. And most current all-weather photocatalysts are long afterglow materials. Although long afterglow materials can achieve long-time photoluminescence and there is already a relatively mature theoretical system, their luminescence intensity, afterglow time, preparation cost and complex preparation process limit their application scope. Therefore, it is of great significance to develop a method to decouple carbon dioxide emission reduction from solar energy supply to achieve the goal of all-weather carbon dioxide conversion. Summary of the Invention

[0005] In order to solve the above technical problems existing in the prior art, the present invention provides a method for preparing a photocatalyst with artificial photosynthesis and its application. By performing a series of treatments on the catalyst, it can have an effect similar to photosynthesis, and solves the problem that the existing catalysts cannot perform effective catalysis under the condition of no illumination.

[0006] To achieve the above object, the present invention provides the following technical solution: A preparation method of a photocatalyst with artificial photosynthesis, comprising the following steps:

[0007] S1. Weigh a quantitative amount of raw materials, place them in deionized water, stir until fully dissolved, transfer the solution to a reaction kettle, and react at 180 °C for 15 - 24 h;

[0008] S2. After the reaction is completed, centrifuge and collect the precipitate product, wash and dry it to obtain a Group VIb variable-valence metal oxide catalyst.

[0009] Preferably, it further includes modifying the catalyst obtained in S2 with a noble metal.

[0010] Preferably, the raw materials in S1 are Na 2 WO 4 ·2H 2 O and NaHSO 4 ·H 2 O, and the mass ratio of the two is 1:1.2.

[0011] Preferably, in S2, after natural cooling to room temperature, centrifuge at a speed of 8000 r / min for 3 min, wash three times alternately with deionized water and ethanol, and dry in a vacuum drying oven at 60 °C.

[0012] Preferably, the raw materials in S1 are (NH 4 ) 6 Mo 7 O 24 ·4H 2 O.

[0013] Preferably, the specific steps of the modification treatment are:

[0014] S3. Weigh the catalyst prepared in S2, place it in a quartz closed reactor to dissolve, and form a uniform white solution;

[0015] S4. Activate the catalyst;

[0016] S5. Drop H 2 PtCl 6 ·xH 2 O or (NH 4 ) 2 PdCl 4 into the activated solution, stir evenly, centrifuge and collect the precipitate product, wash and dry.

[0017] Preferably, the specific steps of the activation treatment in S4 are: First, purify the white solution with Ar for 1 h, and then use a 300 W xenon lamp as a light source to irradiate for 1 h to make the solution change from white to light blue.

[0018] Preferably, it further includes adding the prepared catalyst precursor into absolute ethanol, stirring evenly, transferring the obtained suspension to a reaction kettle, heating at 140 °C for 12 hours, naturally cooling to room temperature, centrifuging to collect dark blue precipitate, and washing and drying to obtain the catalyst.

[0019] The present invention also proposes an application of the photocatalyst prepared by the above method in the catalytic reduction reaction of carbon dioxide.

[0020] Preferably, the catalyst dosage is 50 mg, and the solution system is: 15 mL of acetonitrile, 5 mL of triethanolamine, and 30 mL of deionized water;

[0021] The light source for the photocatalytic reaction is a xenon lamp source, and the photocatalytic reaction time is carried out by turning on the light for 1 h and turning off the light for 1 h.

[0022] Compared with the prior art, the present invention provides a preparation method and application of a photocatalyst with artificial photosynthesis, having the following beneficial effects:

[0023] (1) The present invention simulates the photosynthesis mechanism in nature and develops a new type of photocatalyst that can store energy under light conditions and continue to play a catalytic role in the dark environment. Based on variable-valence metal oxides as the matrix, after being modified by noble metals, it not only optimizes the electronic structure of the material but also promotes the effective transfer and storage of photo-generated electrons. This catalyst has the advantages of promoting the transfer and separation of photo-generated electrons and holes, inhibiting the recombination of electrons and holes, and enhancing the catalytic performance of the material. Under light conditions, the catalyst can efficiently capture photons, generate electron-hole pairs, and store these photo-generated electrons and hydrogen atoms generated by the reaction, reserving energy for subsequent catalytic reactions. When the light stops and it is in the dark environment, the previously stored photo-generated electrons and hydrogen atoms can be slowly and continuously released to drive the CO 2 reduction reaction to continue.

[0024] (2) The method for preparing the photocatalyst of the present invention is simple and green economy. The prepared photocatalyst can still continuously and stably play a catalytic role under the conditions of insufficient light intensity or completely dark state. This characteristic greatly expands its potential application fields and enhances the universality and flexibility of practical applications. It solves the problem that photocatalysts cannot fully utilize energy in practical applications, and also realizes the conversion of carbon dioxide into high-value products driven by solar energy in an environmentally friendly and sustainable way. This breakthrough progress opens up a brand-new exploration space for the frontier research field of photocatalytic reduction of carbon dioxide, providing broader ideas and practical directions for scientific researchers. In response to the challenges of global climate change, promoting the development of green chemistry, and realizing the sustainable development of the economic society, the present invention provides strong technical support and solid theoretical basis, indicating the arrival of a cleaner, lower-carbon, and more efficient new energy utilization era, and having far-reaching significance for promoting global environmental improvement and energy structure transformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention. In the drawings:

[0026] Figures 1 to 8 It is a graph of the reaction product yield when the catalysts prepared in Examples 1-8 of the present invention are subjected to photocatalytic reaction tests. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. The components of the embodiments of the present invention described and illustrated herein can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the present invention provided herein is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] Example 1

[0029] Dissolve 1 g of Na 2 WO 4 ·2H 2 O and 1.2 g of NaHSO 4 ·H 2O was dissolved in 40 mL of deionized water. After stirring evenly, it was transferred into an autoclave and heated at 180 °C for 24 h. After the reaction ended, the precipitate product was collected by centrifugation, washed several times with deionized water and ethanol, and dried overnight in a vacuum drying oven at 60 °C, denoted as WO 3 .

[0030] 50 mg of the catalyst prepared above was weighed and placed in a photocatalytic reactor. 15 ml of acetonitrile, 30 ml of water, and 5 ml of triethanolamine were added respectively. The reactor was sealed and evacuated. Then CO 2 was introduced to 0.02 MPa, and the test was carried out by alternately turning the lamp on and off every hour to simulate natural sunlight.

[0031] Example 2

[0032] 1 g of Na 2 WO 4 ·2H 2 O and 1.2 g of NaHSO 4 ·H 2 O were dissolved in 40 mL of deionized water. After stirring evenly, it was transferred into an autoclave and heated at 180 °C for 24 h. After the reaction ended, the precipitate product was collected by centrifugation, washed several times with deionized water and ethanol, and dried overnight in a vacuum drying oven at 60 °C, denoted as WO 3 ;

[0033] 200 mg of WO 3 was placed in a quartz sealed reactor and dissolved to form a uniform white solution. The solution was first purged with Ar for 1 h, and then irradiated with a 300 W xenon lamp as a light source for 1 h to activate WO 3 . The solution changed from white to light blue. Finally, 12.4 mL of 1.6 mg·ml -1 H 2 PtCl 6 ·xH 2 O was added dropwise while stirring continuously. The precipitate product was collected by centrifugation, washed and dried, denoted as Pt / WO 3 .

[0034] 50 mg of the catalyst prepared above was weighed and placed in a photocatalytic reactor. 15 ml of acetonitrile, 30 ml of water, and 5 ml of triethanolamine were added respectively. The reactor was sealed and evacuated. Then CO 2 was introduced to 0.02 MPa, and the test was carried out by alternately turning the lamp on and off every hour to simulate natural sunlight.

[0035] Example 3

[0036] 1 g of Na 2 WO 4 ·2H 2 O and 1.2 g of NaHSO4 ·H 2 O was dissolved in 40 mL of deionized water. After stirring evenly, it was transferred into an autoclave and heated at 180 °C for 24 h. After the reaction ended, the precipitate product was collected by centrifugation and washed several times with deionized water and ethanol, and then dried overnight in a vacuum drying oven at 60 °C, denoted as WO 3 .

[0037] Weighed 200 mg of WO 3 and placed it in a quartz sealed reactor for dissolution to form a homogeneous white solution. The solution was first purged with Ar for 1 h, and then irradiated with a 300 W xenon lamp as a light source for 1 h to activate WO 3 . The solution changed from white to light blue. Finally, 13.8 mL of 1.0 mg·ml -1 (NH 4 ) 2 PdCl 4 solution was added dropwise with continuous stirring. The precipitate product was collected by centrifugation, washed and dried, denoted as Pd / WO 3 .

[0038] Weighed 50 mg of the catalyst prepared above and placed it in a photocatalytic reactor. 15 ml of acetonitrile, 30 ml of water, and 5 ml of triethanolamine were added respectively. The reactor was sealed and evacuated. Then CO 2 was introduced to 0.02 MPa, and the test was carried out by alternately turning the lamp on and off every hour to simulate natural sunlight.

[0039] Example 4

[0040] 1 g of Na 2 WO 4 ·2H 2 O and 1.2 g of NaHSO 4 ·H 2 O were dissolved in 40 mL of deionized water. After stirring evenly, it was transferred into an autoclave and heated at 180 °C for 24 h. After the reaction ended, the precipitate product was collected by centrifugation and washed several times with deionized water and ethanol, and then dried overnight in a vacuum drying oven at 60 °C, denoted as WO 3 .

[0041] Weighed 200 mg of WO 3 and placed it in a quartz sealed reactor for dissolution to form a homogeneous white solution. The solution was first purged with Ar for 1 h, and then irradiated with a 300 W xenon lamp as a light source for 1 h to activate WO 3 . The solution changed from white to light blue. Finally, 17.0 mL of 1.0 mg·ml -1 HAuCl 4 solution was added dropwise with continuous stirring. The precipitate product was collected by centrifugation, washed and dried, denoted as Au / WO 3。

[0042] Weigh 50 mg of the catalyst prepared above into a photocatalytic reactor, add 15 ml of acetonitrile, 30 ml of water, and 5 ml of triethanolamine respectively, seal the reactor and evacuate it. Then introduce CO 2 to 0.02 MPa, and conduct the test by alternately turning the light on and off every hour to simulate natural sunlight.

[0043] Example 5

[0044] Select the catalyst with the best performance and conduct a simulated light irradiation test with an extended reaction time.

[0045] Dissolve 1 g of Na 2 WO 4 ·2H 2 O and 1.2 g of NaHSO 4 ·H 2 O in 40 mL of deionized water, stir evenly and transfer it into an autoclave, and keep heating at 180 °C for 24 h. After the reaction, centrifuge and collect the precipitate product, wash it several times with deionized water and ethanol, and dry it overnight in a vacuum drying oven at 60 °C, denoted as WO 3 ;

[0046] Weigh 200 mg of WO 3 and place it in a quartz sealed reactor for dissolution to form a uniform white solution. First, purify the solution with Ar for 1 h, and then irradiate it with a 300 W xenon lamp as the light source for 1 h to activate WO 3 , and the solution changes from white to light blue. Finally, add 12.4 mL of 1.6 mg·ml -1 of H 2 PtCl 6 ·xH 2 O dropwise to the activated solution while stirring continuously. Centrifuge and collect the precipitate product, wash and dry it, denoted as Pt / WO 3 .

[0047] Weigh 50 mg of the catalyst prepared above into a photocatalytic reactor, add 15 ml of acetonitrile, 30 ml of water, and 5 ml of triethanolamine respectively, seal the reactor and evacuate it. Then introduce CO 2 to 0.02 MPa, and conduct the test by alternately turning the light on and off every six hours to simulate natural sunlight.

[0048] Example 6

[0049] Select the catalyst with the best performance and conduct a simulated light irradiation test with an extended reaction time.

[0050] Dissolve 1 g of Na 2 WO 4 ·2H 2O and 1.2 g of NaHSO 4 ·H 2 O was dissolved in 40 mL of deionized water. After stirring evenly, it was transferred into an autoclave and heated at 180 °C for 24 h. After the reaction, the precipitated product was collected by centrifugation and washed several times with deionized water and ethanol, and then dried overnight in a vacuum drying oven at 60 °C, denoted as WO 3 ;

[0051] Weighed 200 mg of WO 3 and placed it in a quartz sealed reactor for dissolution to form a homogeneous white solution. The solution was first purged with Ar for 1 h, and then irradiated with a 300 W xenon lamp as a light source for 1 h to activate WO 3 . The solution changed from white to light blue. Finally, 12.4 mL of 1.6 mg·mL -1 H 2 PtCl 6 ·xH 2 O was added dropwise to the activated solution with continuous stirring. The precipitated product was collected by centrifugation, washed and dried, denoted as Pt / WO 3 .

[0052] Weighed 50 mg of the catalyst prepared above and placed it in a photocatalytic reactor. 15 ml of acetonitrile, 30 ml of water, and 5 ml of triethanolamine were added respectively. The reactor was sealed and evacuated. Then CO 2 was introduced to 0.02 MPa, and the test was carried out by alternately turning the light on and off every twelve hours to fully simulate natural sunlight.

[0053] Example 7

[0054] 1.85 g of (NH 4 ) 6 Mo 7 O 24 ·4H 2 O was dispersed in 40 mL of deionized water and stirred at room temperature for 5 minutes. Subsequently, 10 mL of concentrated nitric acid was added to the suspension and stirred for 30 minutes to obtain a transparent solution, which was then transferred to a reaction kettle and heated at 180 °C for 17 h. After naturally cooling to room temperature, the white precipitate was separated by centrifugation and washed alternately three times with deionized water and ethanol, and finally dried in vacuo at 60 °C for one day to obtain the MoO 3 precursor. 0.5 g of the MoO 3 precursor was added to 50 mL of absolute ethanol and stirred at room temperature for 30 minutes. The obtained suspension was transferred to a stainless steel autoclave with a liner and heated at 140 °C for 12 hours. After naturally cooling to room temperature, the dark blue precipitate was collected by centrifugation and washed alternately three times with deionized water and absolute ethanol, and finally dried in vacuo at 60 °C for one day to obtain the MoO 3 catalyst.

[0055] Weigh 50 mg of the catalyst prepared above into a photocatalytic reactor, add 15 ml of acetonitrile, 30 ml of water, and 5 ml of triethanolamine respectively, seal the reactor and evacuate it. Then introduce CO 2 to 0.02 MPa, and conduct the test by alternately turning the lamp on and off every hour to simulate natural sunlight.

[0056] Example 8

[0057] Disperse 1.85 g of (NH 4 ) 6 Mo 7 O 24 ·4H 2 O in 40 mL of deionized water and stir at room temperature for 5 minutes. Subsequently, add 10 mL of concentrated nitric acid to the suspension and stir for 30 minutes to obtain a transparent solution, which is then transferred to a reaction kettle and heated at 180 °C for 17 h. After naturally cooling to room temperature, centrifuge to separate out the white precipitate, wash it three times alternately with deionized water and ethanol, and finally dry it in vacuo at 60 °C for one day to obtain the MoO 3 precursor. Add 0.5 g of the MoO 3 precursor to 50 mL of absolute ethanol and stir at room temperature for 30 minutes. Transfer the obtained suspension to a stainless steel autoclave with a liner and heat it at 140 °C for 12 hours. Naturally cool to room temperature, centrifuge to collect the dark blue precipitate, wash it three times alternately with deionized water and absolute ethanol, and finally dry it in vacuo at 60 °C for one day to obtain the MoO 3 catalyst.

[0058] Weigh 144 mg of MoO 3 and place it in a beaker to dissolve to form a homogeneous solution. Then add 13.0 mL of a H -1 solution of 1.6 mg·ml 2 PtCl 6 ·xH 2 O dropwise to the solution while stirring continuously. Centrifuge to collect the precipitate product, wash and dry it, and label it as Pt / MoO 3 .

[0059] Weigh 50 mg of the catalyst prepared above into a photocatalytic reactor, add 15 ml of acetonitrile, 30 ml of water, and 5 ml of triethanolamine respectively, seal the reactor and evacuate it. Then introduce CO 2 to 0.02 MPa, and conduct the test by alternately turning the lamp on and off every hour to simulate natural sunlight.

[0060] During the photoreaction process, under light illumination, electrons transfer from WO 3The valence band of the carriers is excited to its conduction band, forming conduction band electrons with reducibility and valence band holes with oxidizability. The O atoms are oxidized by the remaining holes in the valence band to release O 2 . At the same time, a part of W 3 on the surface of WO 6+ is reduced to W 5+ for storing electrons. In the dark reaction, the stored electrons and hydrogen atoms are spontaneously released to achieve CO 2 reduction.

[0061] After loading with noble metals, the electrons are excited from the valence band of the carriers to its conduction band and then transferred to the Pt site to achieve water splitting. The O atoms are oxidized by the remaining holes in the valence band to release O 3 , and the H atoms at the Pt site overflow to the WO 2 support. 3

[0062] The Pd site can act as a transfer station for protons and electrons to promote proton-electron coupled transfer, which can not only accelerate the pre-activation of the initial catalyst, but also make an important contribution to CO 2 reduction. The W δ+ -Pd site synergistically enhances the adsorption and activation of CO 2 and H 2 O and the stabilization of the intermediate.

[0063] Au can regulate the electronic structure, inhibit the combination of H atoms to form H 2 , overflow H to the catalyst, and at the same time, a part of W 6+ on the catalyst surface is reduced to W 5+ for storing electrons to achieve the performance of the dark reaction.

[0064] In the MoO 3 system, similar to WO 3 , electrons are excited from the valence band to its conduction band, and part of Mo 6+ is reduced to Mo 5 + for storing electrons. In the dark reaction, the stored electrons are released from its surface to achieve carbon dioxide reduction, and at the same time, the low-valent Mo is oxidized to return to its original state. The noble metal realizes water splitting and overflows H atoms to promote proton-electron coupled transfer.

[0065] In the above Examples 1-8, the main product of all catalysts is CO, and all catalysts have dark reaction performance. Especially after being loaded with noble metals, the efficiency of the catalysts increases significantly. In Example 1, CO is the main product. Only calculating the yield in the light reaction stage is about 0.5 mmol / g / h, and the yield in the dark reaction process is about 25% of that under illumination. After loading the noble metal Pt in Example 2, the yield increases significantly. The yield of the main product CO in the light reaction stage is about 10 mmol / g / h, and the selectivity is about 94%. After loading Pd, there is no dark reaction performance for CO, but CH 4 has dark reaction performance, and the yield is about three times higher than that of pure WO 3 . After loading Au in Example 4, the dark reaction yield is about 20% of that in the light reaction process. Calculated based on the light reaction process, the CO yield is 2 mmol / g / h.

[0066] At the same time, select the Pt / WO 3 catalyst with the best performance to increase the reaction time. It is found that the catalyst still has performance within 12 h, proving its good stability. And within the dark reaction time of 6-12 h, the products continue to increase, and the highest yields can reach 157.78 mmol / g and 436.87 mmol / g respectively.

[0067] As can be seen in Example 7, the pure MoO 3 catalyst has dark reaction performance, but its total yield is not high, only reaching 2.16 mmol / g. However, after adding the noble metal Pt, as in Example 8, the yield increases slightly, about 3.06 mmol / g, and the dark reaction yield is about 19% of that during the illumination process.

[0068] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. A method for preparing a photocatalyst having artificial photosynthesis, characterized in that: The following steps are involved: S1. Weigh a certain amount of raw materials and place them in deionized water and stir until fully dissolved. Transfer the solution into a reactor and react at 180°C for 15 to 24 hours; S2. After the reaction is completed, the precipitated product is collected by centrifugation, and then washed and dried to obtain the sixth sub-group variable valence metal oxide catalyst.

2. The method for preparing a photocatalyst having artificial photosynthesis according to claim 1, characterized in that: It also includes modifying the catalyst obtained in S2 with precious metals.

3. The method for preparing a photocatalyst having artificial photosynthesis according to claim 2, characterized in that: The raw materials in S1 are Na2WO4·2H2O and NaHSO4·H2O, and the mass ratio between them is 1:1.

2.

4. The method for preparing a photocatalyst having artificial photosynthesis according to claim 3, characterized in that: In S2, after naturally cooling to room temperature, the sample was centrifuged at 8000 r / min for 3 min, washed alternately with deionized water and ethanol three times, and dried in a vacuum drying oven at 60°C.

5. The method for preparing a photocatalyst having artificial photosynthesis according to claim 2, characterized in that: The raw material in S1 is (NH4)6Mo7O 24 ·4H2O.

6. A method for preparing a photocatalyst having artificial photosynthesis according to claim 2 or 5, characterized in that: The specific steps of modification treatment are: S3, weigh the catalyst prepared in S2 and place it in a quartz closed reactor to dissolve to form a uniform white solution; S4, activating the catalyst; S5. Add H2PtCl6·xH2O or (NH4)2PdCl4 dropwise to the activated solution, stir evenly, collect the precipitated product by centrifugation, wash and dry.

7. The method for preparing a photocatalyst having artificial photosynthesis according to claim 6, characterized in that: The specific steps of the activation treatment in S4 are: the white solution is first purified by Ar for 1 hour, and then irradiated with a 300W xenon lamp as a light source for 1 hour, so that the solution changes from white to light blue.

8. The method for preparing a photocatalyst having artificial photosynthesis according to claim 5, characterized in that: The method also includes adding the prepared catalyst precursor into anhydrous ethanol and stirring evenly, transferring the obtained suspension into a reaction kettle, heating at 140° C. for 12 hours and naturally cooling to room temperature, collecting a dark blue precipitate by centrifugation, and washing and drying to obtain a catalyst.

9. Use of a photocatalyst prepared by the method according to any one of claims 1 to 8 in a catalytic reduction reaction of carbon dioxide.

10. The use of the photocatalyst in the catalytic reduction reaction of carbon dioxide according to claim 9, characterized in that: The catalyst dosage is 50 mg, and the solution system is: 15 mL acetonitrile, 5 mL triethanolamine, and 30 mL deionized water; The light source for the photocatalytic reaction is a xenon lamp light source, and the photocatalytic reaction time is 1-12 hours with the light on and 1-12 hours with the light off.

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