Microwave-assisted synthesized platinum-loaded carbon nitride photocatalyst as well as preparation method and application thereof
The microwave-assisted synthesis method supports platinum cocatalysts on the surface of carbon nitride, which solves the problem of high photogenerating electrons and hole recombination rates and large overpotentials of decomposed aquatic hydrogen, which achieves more efficient photocatalytics Decompose hydrogen properties of aquatic products.
Patent Information
- Application Number
- CN202411548724.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-01
- Publication Date
- 2025-02-21
AI Technical Summary
In the prior art, graphite phase carbon nitride (g-C3N4) as a photocatalyst has defects such as high recombination rate of photogenerated electrons and holes and large overpotential of decomposed aquatic hydrogen, resulting in poor catalytic performance.
The microwave-assisted synthesis method is used to load platinum cocatalysts on the surface of carbon nitride, and small-sized platinum particles are formed through microwave constant temperature reaction, thereby improving the load stability and reaction activity of metal platinum.
It effectively improves the separation efficiency between photogenerated electrons and holes, reduces the overpotential of the decomposition of aquatic hydrogen on the surface of the catalyst, and significantly improves the photocatalytic decomposition of aquatic hydrogen on carbon nitride.
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Abstract
Description
Technical Field
[0001] The embodiments of the present application relate to the field of catalyst technology, and in particular to a microwave-assisted synthesis of platinum-loaded carbon nitride photocatalyst, a preparation method, and an application thereof. Background Art
[0002] As a non-renewable energy, the increasing consumption of fossil energy has become an important factor restricting the sustainable development of human society, which has led to widespread attention and research on the development and utilization of renewable clean energy. Using photocatalytic water decomposition to produce hydrogen technology to convert solar energy into hydrogen energy is one of the most effective solutions to the above problems. In order to achieve this goal, a large number of studies have been used to find a stable, efficient, visible light responsive photocatalyst. In 2009, Wang Xinchen et al. first reported that graphene phase carbon nitride (g-C3N4) with a two-dimensional conjugated large π bond structure prepared by cyanamide thermal induced self-polymerization reaction was used for photocatalytic water decomposition to produce hydrogen (see Nat. Mater., 2008, 8(1): 76). However, as a single photocatalyst, g-C3N4 has defects such as high recombination rate of photogenerated electrons and holes and large overpotential for water decomposition to produce hydrogen, which seriously affects its catalytic performance.
[0003] In order to solve the above problems, platinum salts are usually quantitatively added to the photocatalytic system during the g-C3N4 photolysis of water to produce hydrogen, and metal platinum is deposited on the surface of g-C3N4 by photoreduction to play the role of a co-catalyst. A large number of studies have shown that the introduction of a co-catalyst in the g-C3N4 photolysis of water is beneficial to the effective separation of photogenerated electrons and holes, provides proton reduction centers, and reduces the overpotential of water decomposition and hydrogen production on the catalyst surface, which is one of the effective ways to improve the catalytic activity of g-C3N4. However, this mixed deposition method makes the metal platinum nanoparticles grown on the surface of g-C3N4 randomly dispersed, uncontrollable in size, and easily affected by the environment, resulting in problems such as poor reproducibility of the co-catalytic performance of the precious metal platinum and low effective utilization rate.
[0004] How to effectively load metal platinum co-catalyst on the surface of g-C3N4 to improve the catalytic performance of g-C3N4 has become a recent research hotspot. Summary of the invention
[0005] In view of this, the embodiments of the present application provide a microwave-assisted synthesis of a platinum-loaded carbon nitride photocatalyst, a preparation method and an application thereof. The platinum-loaded carbon nitride photocatalyst can effectively improve the separation efficiency of photogenerated electrons and holes and inhibit the recombination of the two. Compared with pure phase carbon nitride, its photolysis of water to produce hydrogen activity is higher; in addition, the preparation method of the present application is simple to operate and has high reaction efficiency; it can effectively overcome the defects existing in the above-mentioned prior art.
[0006] The first aspect of the embodiment of the present application provides a method for preparing a microwave-assisted synthesis of a platinum-loaded carbon nitride photocatalyst, comprising the following steps:
[0007] Step S1, dissolving a platinum source in a solvent, obtaining a platinum solution after ultrasonic treatment, and storing it away from light;
[0008] Step S2, adding carbon nitride to the platinum solution, avoiding light and ultrasound, and stirring at room temperature to obtain a mixed solution;
[0009] Step S3, subjecting the mixed solution to a microwave constant temperature reaction, cooling naturally to room temperature, and obtaining a platinum-loaded carbon nitride photocatalyst after separation, washing, and drying of the product.
[0010] Preferably, in step S3, chloroform, methanol or acetonitrile is used for washing; and vacuum drying is used for drying.
[0011] According to the growth mechanism of metallic platinum on the surface of carbon nitride, the size, morphology, distribution and stability of platinum particles on the surface of carbon nitride are closely related to the energy supply method. Fast and efficient energy supply methods are conducive to the formation of small-sized platinum particles, increasing the total reaction area and reaction active sites of platinum, and also improving the stability of metallic platinum on the surface of carbon nitride. This application uses microwave-assisted carbon nitride to efficiently load small-sized co-catalyst metallic platinum, which can effectively solve the problem of low utilization of precious metals and greatly improve the photocatalytic decomposition of water to produce hydrogen performance of carbon nitride, and has great application potential.
[0012] In some embodiments that may include the above embodiments, in step S3, the temperature of the microwave constant temperature reaction is 80-140° C., preferably 120° C.; the time of the microwave constant temperature reaction is 0.5-4 h, preferably 2 h.
[0013] In some embodiments that may include the above embodiments, in step S3, the mass ratio of metal platinum to carbon nitride in the platinum-loaded carbon nitride photocatalyst is (0.5-1.5):100, preferably 1:100.
[0014] In some embodiments that may include the above embodiments, in step S2, the preparation process of carbon nitride is: placing a graphite phase carbon nitride precursor in a muffle furnace for calcining, the calcination temperature is 520-620°C, preferably 600°C, the calcination time is 2-6h, preferably 4h, and naturally cooling to room temperature.
[0015] Exemplarily, a crucible containing a graphite-phase carbon nitride precursor is placed in a muffle furnace for calcination.
[0016] In some embodiments that may include the above embodiments, the graphite phase carbon nitride precursor is selected from at least one of urea, cyanamide, dicyandiamide, and melamine.
[0017] In some embodiments that may include the above embodiments, in step S3, the specific process of the microwave constant temperature reaction is: transferring the mixed solution into a polytetrafluoroethylene reactor and reacting in a microwave hydrothermal synthesizer.
[0018] In some embodiments that may include the above embodiments, in step S2, the light-proof ultrasonic time is 0.5 to 4 hours, preferably 2 hours; the room temperature stirring time is 0.5 to 4 hours, preferably 2 hours.
[0019] In some embodiments that may include the above embodiments, in step S1, the platinum source is selected from one of platinum dichloride, potassium tetrachloroplatinite, potassium chloroplatinate, and chloroplatinic acid; the solvent is water or an organic mixed liquid, and the organic mixed liquid is a mixture of acetonitrile and triethylamine, wherein the volume fraction of triethylamine in the mixed liquid is 0.5 to 3.0%.
[0020] The second aspect of the embodiments of the present application also provides a microwave-assisted synthesis of platinum-loaded carbon nitride photocatalyst, which is prepared by the above method.
[0021] A third aspect of the embodiments of the present application also provides the use of the above-mentioned microwave-assisted synthesis of platinum-loaded carbon nitride photocatalyst in visible light catalytic decomposition of water to produce hydrogen.
[0022] Compared with the prior art, the embodiments of the present application have the following beneficial effects:
[0023] (1) In the preparation method of the present application, the use of precious metal platinum as a co-catalyst can effectively solve the problems of high recombination rate of photogenerated electrons and holes and large overpotential for hydrogen production from the photocatalytic decomposition of water by g-C3N4. This is because the Fermi level of metal platinum is lower than that of the semiconductor g-C3N4. Electrons migrate from g-C3N4 to the surface of metal platinum, so that the surface of metal platinum will obtain more excess negative charges and form metal-hydrogen bonds with hydrogen atoms, thereby promoting the separation of electron-hole pairs in the semiconductor g-C3N4 and improving its photocatalytic performance.
[0024] (2) In the carbon nitride photocatalyst loaded with platinum co-catalyst prepared in the present application, the N / C synergistic framework formed by the unique tri-s-triazine unit can enable the carbon nitride structure to capture or embed precious metal platinum, thereby forming an efficient photocatalytic hydrogen production system.
[0025] (3) The present application adopts a microwave hydrothermal synthesis method to load the precious metal platinum co-catalyst on the carbon nitride surface, which effectively regulates the loading size of the metal platinum, not only improving the effective utilization rate of the precious metal and exposing more active sites, but also better promoting the separation of photogenerated electrons and holes.
[0026] (4) The present application adopts a series of platinum salts such as platinum dichloride as platinum sources, and prepares carbon nitride semiconductor photocatalysts loaded with platinum co-catalysts through microwave hydrothermal synthesis. Compared with the photodeposition of platinum in the general photocatalytic process, it not only reduces the amount of precious metal platinum, but also greatly improves the utilization rate of platinum and the efficiency of photocatalytic hydrogen production. The preparation method of the present application is simple to operate and has efficient reaction. The obtained catalyst has excellent photocatalytic performance and can be widely used in the fields of photocatalytic hydrogen production. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.
[0028] Figure 1 X-ray diffraction (XRD) spectra of microwave-treated carbon nitride a in Comparative Example 1 and microwave-assisted carbon nitride supported platinum co-catalyst b in Example 2;
[0029] Figure 2 Field emission scanning electron microscope (FESEM) images of microwave-treated carbon nitride a in Comparative Example 1 and microwave-assisted carbon nitride supported on platinum co-catalyst b in Example 2;
[0030] Figure 3 This is the energy spectrum (EDS) diagram of microwave-assisted carbon nitride-supported platinum co-catalyst b in Example 2;
[0031] Figure 4 This is a performance comparison diagram of visible light catalytic hydrogen production by microwave-treated carbon nitride a in Comparative Example 1 and microwave-assisted carbon nitride supported on platinum co-catalyst b in Example 2;
[0032] Figure 5 This is a stability diagram of photocatalytic hydrogen production using microwave-assisted carbon nitride supported platinum co-catalyst in Example 2. DETAILED DESCRIPTION
[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0034] Unless otherwise specified, the experimental methods used in the examples of this application are all conventional methods.
[0035] In the following examples and comparative examples, unless otherwise specified, all raw materials can be obtained by commercial purchase or conventional methods.
[0036] Example 1
[0037] The method for preparing a microwave-assisted synthesis of a platinum-loaded carbon nitride photocatalyst comprises the following steps:
[0038] Weigh 50.0 g of urea and put it in a crucible. Cover the crucible with a lid and place it in a muffle furnace for calcination. Raise the temperature to 600°C at a heating rate of 5°C / min, keep the temperature constant for 4 hours, and then cool it naturally to room temperature. Collect the sample in the crucible to obtain graphite phase carbon nitride.
[0039] Accurately weigh 1.36 mg of platinum dichloride and place it in a brown centrifuge tube, add 25 mL of acetonitrile-triethylamine mixed solution with a triethylamine volume fraction of 0.8%, ultrasonically dissolve, and store in the dark. Then add 100 mg of graphite phase carbon nitride, ultrasonically stir at room temperature for 2 hours each in the dark, then transfer to a polytetrafluoroethylene reactor, and carry out a loading reaction in a microwave hydrothermal synthesizer, rise to 100 ° C for 15 minutes, maintain for 2 hours, set the upper limit of pressure to 6 MPa, and set the power to 500 W. After cooling naturally to room temperature, the product is centrifuged, washed with chloroform, methanol, and acetonitrile, and placed in a vacuum drying oven at 80 ° C overnight. The collected sample is the carbon nitride supported platinum co-catalyst prepared by microwave assisted method.
[0040] Example 2
[0041] The method for preparing a microwave-assisted synthesis of a platinum-loaded carbon nitride photocatalyst comprises the following steps:
[0042] Weigh 50.0 g of urea and put it in a crucible. Cover the crucible with a lid and place it in a muffle furnace for calcination. Raise the temperature to 600°C at a heating rate of 5°C / min, keep the temperature constant for 4 hours, and then cool it naturally to room temperature. Collect the sample in the crucible to obtain graphite phase carbon nitride.
[0043] Accurately weigh 1.36 mg of platinum dichloride and place it in a brown centrifuge tube, add 25 mL of acetonitrile-triethylamine mixed solution with a volume fraction of triethylamine of 1%, ultrasonically dissolve, and store in the dark. Then add 100 mg of graphite phase carbon nitride, ultrasonically stir at room temperature for 2 hours in the dark, transfer to a polytetrafluoroethylene reactor, and carry out a loading reaction in a microwave hydrothermal synthesizer, rise to 120°C for 15 minutes, maintain for 2 hours, set the upper limit of pressure to 6MPa, and set the power to 500W. After cooling naturally to room temperature, the product is centrifuged, washed with chloroform, methanol, and acetonitrile, and placed in a vacuum drying oven at 80°C overnight. The collected sample is the carbon nitride supported platinum co-catalyst prepared by microwave-assisted method.
[0044] Example 3
[0045] The method for preparing a microwave-assisted synthesis of a platinum-loaded carbon nitride photocatalyst comprises the following steps:
[0046] Weigh 50.0 g of urea and put it in a crucible. Cover the crucible with a lid and place it in a muffle furnace for calcination. Raise the temperature to 600°C at a heating rate of 5°C / min, keep the temperature constant for 4 hours, and then cool it naturally to room temperature. Collect the sample in the crucible to obtain graphite phase carbon nitride.
[0047] Accurately weigh 1.36 mg of platinum dichloride and place it in a brown centrifuge tube, add 25 mL of acetonitrile-triethylamine mixed solution with a triethylamine volume fraction of 0.8%, ultrasonically dissolve, and store in the dark. Then add 100 mg of graphite phase carbon nitride, ultrasonically stir at room temperature for 2 hours each in the dark, transfer to a polytetrafluoroethylene reactor, and carry out a loading reaction in a microwave hydrothermal synthesizer, rise to 140°C for 15 minutes, maintain for 2 hours, set the upper limit of pressure to 6MPa, and set the power to 500W. After cooling naturally to room temperature, the product is centrifuged, washed with chloroform, methanol, and acetonitrile, and placed in a vacuum drying oven at 80°C overnight. The collected sample is the carbon nitride supported platinum co-catalyst prepared by microwave assisted method.
[0048] Example 4
[0049] The method for preparing a microwave-assisted synthesis of a platinum-loaded carbon nitride photocatalyst comprises the following steps:
[0050] Weigh 50.0 g of urea and put it in a crucible. Cover the crucible with a lid and place it in a muffle furnace for calcination. Raise the temperature to 600°C at a heating rate of 5°C / min, keep the temperature constant for 4 hours, and then cool it naturally to room temperature. Collect the sample in the crucible to obtain graphite phase carbon nitride.
[0051] Accurately weigh 1.36 mg of platinum dichloride and place it in a brown centrifuge tube, add 25 mL of acetonitrile-triethylamine mixed solution with a triethylamine volume fraction of 0.8%, ultrasonically dissolve, and store in the dark. Then add 100 mg of graphite phase carbon nitride, ultrasonically and stir at room temperature for 2 hours each in the dark, transfer to a polytetrafluoroethylene reactor, and carry out a loading reaction in a microwave hydrothermal synthesizer, rise to 120°C for 15 minutes, maintain for 1 hour, set the upper limit of pressure to 6MPa, and set the power to 500W. After naturally cooling to room temperature, the product is centrifuged, washed with chloroform, methanol, and acetonitrile, and placed in a vacuum drying oven at 80°C overnight. The collected sample is the carbon nitride supported platinum co-catalyst prepared by microwave assisted method.
[0052] Example 5
[0053] The method for preparing a microwave-assisted synthesis of a platinum-loaded carbon nitride photocatalyst comprises the following steps:
[0054] Weigh 50.0 g of urea and put it in a crucible. Cover the crucible with a lid and place it in a muffle furnace for calcination. Raise the temperature to 600°C at a heating rate of 5°C / min, keep the temperature constant for 4 hours, and then cool it naturally to room temperature. Collect the sample in the crucible to obtain graphite phase carbon nitride.
[0055] Accurately weigh 1.36 mg of platinum dichloride and place it in a brown centrifuge tube, add 25 mL of acetonitrile-triethylamine mixed solution with a triethylamine volume fraction of 0.8%, ultrasonically dissolve, and store in the dark. Then add 100 mg of graphite phase carbon nitride, ultrasonically and stir at room temperature for 2 hours each in the dark, transfer to a polytetrafluoroethylene reactor, and carry out a loading reaction in a microwave hydrothermal synthesizer, rise to 120°C for 15 minutes, maintain for 3 hours, set the upper limit of pressure to 6MPa, and set the power to 500W. After cooling naturally to room temperature, the product is centrifuged, washed with chloroform, methanol, and acetonitrile, and placed in a vacuum drying oven at 80°C overnight. The collected sample is the carbon nitride supported platinum co-catalyst prepared by microwave assisted method.
[0056] Comparative Example 1
[0057] The method for preparing a microwave-assisted carbon nitride photocatalyst comprises the following steps:
[0058] Weigh 50.0 g of urea and put it in a crucible. Cover the crucible with a lid and place it in a muffle furnace for calcination. Raise the temperature to 600°C at a heating rate of 5°C / min, keep the temperature constant for 4 hours, and then cool it naturally to room temperature. Collect the sample in the crucible to obtain graphite phase carbon nitride.
[0059] Weigh 100 mg of graphite phase carbon nitride in a centrifuge tube, add 25 mL of acetonitrile-triethylamine mixed solution with a triethylamine volume fraction of 0.8%, avoid light and ultrasonic, stir at room temperature for 2 hours each. Then transfer to a polytetrafluoroethylene reactor for microwave reaction, raise to 120°C for 15 minutes, maintain for 2 hours, set the upper limit of pressure to 6MPa, and set the power to 500W. After cooling naturally to room temperature, the product is separated, washed, dried and collected, which is microwave-treated carbon nitride.
[0060] Experimental example: Photocatalytic water splitting and hydrogen production experiment with different visible light catalysts
[0061] Based on the photocatalytic decomposition of water to produce hydrogen system, the photocatalytic decomposition of water to produce hydrogen by the microwave-assisted carbon nitride supported platinum co-catalyst prepared in Example 2 was investigated. 50 mg of the sample prepared in Example 2 was weighed and dissolved in 100 mL of secondary water with a triethanolamine volume fraction of 10%. After ultrasonic treatment for half an hour, the solution was transferred to the photocatalytic reaction tank. During the entire test process, stirring was always maintained and cooling water was connected to keep the reaction system at room temperature. Vacuum was applied to remove all gases in the system. The light source (300W xenon lamp, filter λ>420nm) was turned on to carry out a photocatalytic reaction. The H2 produced by the reaction was determined by online gas chromatography analysis technology, and the results are shown in the figure. Figure 4 The test steps of the photocatalytic performance of comparative example 1 are similar to those described above. 50 mg of the sample prepared in comparative example 1 is weighed and added to a mixed solution of triethanolamine (10 mL) and water (90 mL). After ultrasonication for half an hour, it is transferred to a reactor and H2PtCl6 (1 wt%) is added. After stirring evenly, the light source is turned on for photocatalytic reaction, and the H2 produced by the reaction is measured.
[0062] Depend on Figure 4 It can be seen that under visible light irradiation, the photocatalytic decomposition of water and hydrogen production rate of the microwave-assisted carbon nitride-supported platinum co-catalyst prepared in Example 2 reached 1700 μmol / h / g, which is about 21 times that of the sample in Comparative Example 1 (80 μmol / h / g), indicating that the microwave-assisted carbon nitride-supported platinum co-catalyst prepared by the method of the present application has higher photocatalytic activity.
[0063] Figure 1 The peak shapes of curves a and b are almost the same. Only the characteristic peaks of carbon nitride (100 and 002) can be seen, and the peaks of platinum particles cannot be seen, indicating that the platinum co-catalyst on the carbon nitride surface is small in size and has little effect on the structure of carbon nitride.
[0064] Figure 2 In the figure, we can see that the carbon nitride supported platinum co-catalyst is in the shape of nanosheets before and after. Platinum particles cannot be seen under an electron microscope magnified 80,000 times, indicating that the size of the microwave-assisted carbon nitride supported platinum co-catalyst is small enough.
[0065] Figure 3 It can be seen that the distribution of platinum atoms on the surface of carbon nitride is extremely uniform, which is beneficial to improving the photocatalytic performance of carbon nitride.
[0066] Figure 5 It can be seen that the photocatalytic decomposition of water to produce hydrogen by microwave-assisted carbon nitride supported on platinum co-catalyst is relatively stable, and the photocatalytic efficiency has hardly decreased after being reused three times.
[0067] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.
Claims
1. A method for preparing a microwave-assisted synthesis of a platinum-loaded carbon nitride photocatalyst, characterized in that: The following steps are involved: Step S1, dissolving a platinum source in a solvent, obtaining a platinum solution after ultrasonic treatment, and storing it away from light; Step S2, adding carbon nitride to the platinum solution, avoiding light and ultrasound, and stirring at room temperature to obtain a mixed solution; Step S3, subjecting the mixed solution to a microwave constant temperature reaction, cooling naturally to room temperature, and obtaining a platinum-loaded carbon nitride photocatalyst after separation, washing, and drying of the product.
2. The method for preparing a microwave-assisted synthesis of a platinum-loaded carbon nitride photocatalyst according to claim 1, characterized in that: In step S3, the temperature of the microwave constant temperature reaction is 80-140° C., and the time of the microwave constant temperature reaction is 0.5-4 h.
3. The method for preparing a microwave-assisted synthesis of a platinum-loaded carbon nitride photocatalyst according to claim 1, characterized in that: In step S3, the mass ratio of metal platinum to carbon nitride in the platinum-loaded carbon nitride photocatalyst is (0.5-1.5):
100.
4. The method for preparing a microwave-assisted synthesis of a platinum-loaded carbon nitride photocatalyst according to claim 1, characterized in that: In step S2, the preparation process of carbon nitride is as follows: placing a graphite phase carbon nitride precursor in a muffle furnace for calcining at a temperature of 520-620° C. for 2-6 hours, and naturally cooling to room temperature.
5. The method for preparing a microwave-assisted synthesis of a platinum-loaded carbon nitride photocatalyst according to claim 4, characterized in that: The graphite phase carbon nitride precursor is selected from at least one of urea, cyanamide, dicyandiamide and melamine.
6. The method for preparing a microwave-assisted synthesis of a platinum-loaded carbon nitride photocatalyst according to claim 1, characterized in that: In step S3, the specific process of the microwave constant temperature reaction is: transferring the mixed solution into a polytetrafluoroethylene reactor and reacting in a microwave hydrothermal synthesizer.
7. The method for preparing a microwave-assisted synthesis of a platinum-loaded carbon nitride photocatalyst according to claim 1, characterized in that: In step S2, the light-proof ultrasonication time is 0.5 to 4 h, and the room temperature stirring time is 0.5 to 4 h.
8. The method for preparing a microwave-assisted synthesis of a platinum-loaded carbon nitride photocatalyst according to claim 1, characterized in that: In step S1, the platinum source is selected from one of platinum dichloride, potassium tetrachloroplatinite, potassium chloroplatinate, and chloroplatinic acid; the solvent is water or an organic mixed liquid, and the organic mixed liquid is a mixed liquid of acetonitrile and triethylamine, wherein the volume fraction of triethylamine in the mixed liquid is 0.5-3.0%.
9. A microwave-assisted synthesis of platinum-loaded carbon nitride photocatalyst, characterized in that: The method according to any one of claims 1 to 8 is used to prepare the product.
10. Use of the microwave-assisted synthesis of platinum-loaded carbon nitride photocatalyst according to claim 9 in visible light photocatalytic decomposition of water to produce hydrogen.