Pt nanoparticle loaded Fe-based MOF photocatalyst and preparation method and application thereof

Abstract

The invention discloses a Pt nanoparticle loaded Fe-based MOF photocatalyst as well as a preparation method and application thereof, and belongs to the technical field of environmental energy. According to the preparation method disclosed by the invention, 2-aminoterephthalic acid, FeCl3. 6H2O and a chloroplatinic acid hexahydrate aqueous solution are adopted as raw materials, and Pt nanoparticles are dispersed and loaded on NH2-MIL-101 (Fe) in situ through a hydrothermal reaction, so that the interface charge transfer resistance is reduced, the recombination of photon-generated carriers is inhibited, and the photocatalytic nitrogen fixation activity is further improved; the purpose of improving the yield of ammonia synthesis through photocatalytic conversion of nitrogen is achieved through the synergistic effect of the NH2-MIL-101 (Fe) composite photocatalyst containing Pt nanoparticles, and the problems of high energy consumption and environmental pollution of a traditional industrial nitrogen fixation Hayer-Bosch method are remarkably solved.

Description

Technical Field

[0001] The invention belongs to the technical field of environmental energy, and specifically relates to a Pt nanoparticle-loaded Fe-based MOF photocatalyst, a preparation method and an application thereof. Background Art

[0002] Ammonia is one of the most important chemical raw materials in the world, playing an irreplaceable role in the synthesis of fertilizers, explosives, fibers, and plastics. At present, the global ammonia is mainly obtained from the industrial synthesis Haber-Bosch process. However, the Haber-Bosch process needs to be carried out under harsh reaction conditions, that is, high temperature (450-550℃) and high pressure (15-25Mpa) with the help of iron-based catalysts to produce high-purity N 2 and H 2 Synthetic NH 3 This traditional process consumes about 2% of the world’s energy each year and produces 20-30% of the chemical industry’s CO 2 Therefore, there is an urgent need to develop revolutionary green ammonia synthesis technology.

[0003] Photocatalytic nitrogen fixation is considered to be a viable green technology to replace the traditional Haber-Bosch technology. 3 N 4 、TiO 2 , WO 3 、Bi 2 MnO 6 etc.) have been widely used in the field of photocatalytic ammonia synthesis. However, most traditional semiconductors have problems such as wide band gap, fast electron and hole recombination, slow charge transfer, low solar energy utilization, and limited exposure of active sites. Therefore, it is urgent to develop more efficient photocatalysts to meet the requirements of ammonia synthesis process. Metal organic frameworks (MOFs) with porous structures, ultra-high specific surface areas and adjustable molecular structures are considered to be ideal photocatalysts for ammonia synthesis.

[0004] Although it is widely recognized that modifying MOFs with co-catalysts is one of the effective strategies to enhance the photocatalytic nitrogen fixation activity, promoting the interaction between MOFs and co-catalysts for efficient charge transfer remains challenging. Summary of the invention

[0005] The purpose of the present invention is to provide a Pt nanoparticle-loaded Fe-based MOF photocatalyst and a preparation method and application thereof, so as to solve the problems of high energy consumption and environmental pollution of the traditional industrial nitrogen fixation Haber-Bosch method.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] The present invention discloses a method for preparing a Pt nanoparticle-loaded Fe-based MOF photocatalyst, comprising the following steps:

[0008] 2-aminoterephthalic acid and FeCl 3 6H 2 O is added to the solvent and mixed to obtain a mixture;

[0009] After the mixture was subjected to a hydrothermal reaction, the obtained reaction precipitate was post-treated to obtain NH 2 -MIL-101(Fe) powder;

[0010] NH 2 -MIL-101(Fe) powder and water are mixed to obtain a mixed solution; hexahydrate chloroplatinic acid aqueous solution, a reducing agent and a stabilizer are sequentially dropped into the mixed solution to obtain a Pt nanoparticle-loaded Fe-based MOF photocatalyst.

[0011] Furthermore, the 2-aminoterephthalic acid, FeCl 3 6H 2 The dosage ratio of O and solvent is (54.3~55.0) mg:(162~162.5) mg:(30~31) mL.

[0012] Furthermore, the solvent is DMF.

[0013] Furthermore, the temperature of the hydrothermal reaction is 110° C. and the time is 48 hours.

[0014] Furthermore, the post-treatment is cooling, filtering, washing and freeze-drying in sequence; the freeze-drying treatment time is 6 to 7 hours.

[0015] Furthermore, the NH 2 -The dosage ratio of MIL-101(Fe) powder and water is (133-135) mg: (20-22) mL.

[0016] Furthermore, the reducing agent is a sodium borohydride aqueous solution; and the stabilizing agent is citric acid.

[0017] Furthermore, the dosage ratio of the hexahydrate chloroplatinic acid aqueous solution to the mixed solution is (0.1-0.7) mL: (20-22) mL; the dosage ratio of the reducing agent, the stabilizer to the mixed solution is 1.5 mL: 5 mg: (20-22) mL;

[0018] The concentration of the chloroplatinic acid hexahydrate aqueous solution is 10 to 10.5 mg / mL.

[0019] The invention also discloses a Pt nanoparticle-loaded Fe-based MOF photocatalyst prepared by the preparation method.

[0020] The invention also discloses the use of the Pt nanoparticle-loaded Fe-based MOF photocatalyst in photocatalytic conversion of nitrogen to synthesize ammonia.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The invention discloses a method for preparing a Pt nanoparticle-loaded Fe-based MOF photocatalyst, using 2-aminoterephthalic acid, FeCl 3 6H 2 O and hexahydrate chloroplatinic acid aqueous solution were used as raw materials, and Pt nanoparticles were in situ dispersed and loaded with NH 2 -MIL-101(Fe) reduces the interfacial charge transfer resistance and inhibits the recombination of photogenerated carriers, thereby further improving the photocatalytic nitrogen fixation activity. 2 -MIL-101(Fe) composite photocatalyst to achieve the purpose of increasing the yield of photocatalytic conversion of nitrogen to synthesize ammonia, which significantly solves the high energy consumption and environmental pollution problems of the traditional industrial nitrogen fixation Haber-Bosch method.

[0023] The present invention also discloses a Pt nanoparticle-loaded Fe-based MOF photocatalyst prepared by the above-mentioned preparation method, wherein the catalyst is NH 2 -MIL-101(Fe), Pt are in-situ dispersed nanoparticles, and the 2 The ligand of the group (NH 2 -BDC) bridges Pt nanoparticles to metal organic frameworks (MOFs) to precisely construct directional electron transport channels. This effectively reduces the interfacial charge transfer resistance and inhibits the recombination of photogenerated carriers, thereby enhancing the N 2 Adsorption and activation of molecules.

[0024] The present invention also discloses the application of the above-mentioned Pt nanoparticle-loaded Fe-based MOF photocatalyst in photocatalytic conversion of nitrogen to synthesize ammonia. According to relevant experimental results, compared with unmodified NH 2 -MIL-101(Fe) material, the nitrogen fixation activity of the Pt@NM-101(Fe) composite photocatalyst of the present invention is significantly improved, and its ammonia production is increased by about 4.2 times. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 The Pt nanoparticles prepared in Examples 1 to 5 of the present invention support Fe-based MOF photocatalysts and pure NH 2 - X-ray diffraction (XRD) pattern of MIL-101(Fe);

[0026] Figure 2 This is a SEM image of the Fe-based MOF photocatalyst loaded with Pt nanoparticles prepared in Example 4 of the present invention;

[0027] Figure 3 TEM image of the Fe-based MOF photocatalyst loaded with Pt nanoparticles prepared in Example 4 of the present invention;

[0028] Figure 4 This is a high-resolution TEM image of the Fe-based MOF photocatalyst loaded with Pt nanoparticles prepared in Example 4 of the present invention;

[0029] Figure 5 The Fe-based MOF photocatalyst and the pure NH 2 -UV-visible absorption spectrum of MIL-101(Fe);

[0030] Figure 6 The Fe-based MOF photocatalyst and the pure NH 2 - Transient photocurrent response diagram of MIL-101(Fe);

[0031] Figure 7 The Fe-based MOF photocatalyst and the pure NH 2 - Impedance diagram of MIL-101(Fe);

[0032] Figure 8 The Pt nanoparticles prepared in Examples 1 to 5 of the present invention support Fe-based MOF photocatalysts and pure NH 2 -Activity spectrum of MIL-101(Fe) for photocatalytic conversion of nitrogen to ammonia. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to understand the characteristics and effects of the present invention, the following is a general description and definition of the terms and expressions mentioned in the specification and claims. Unless otherwise specified, all technical and scientific terms used in the text are the common meanings understood by those skilled in the art for the present invention. In the event of a conflict, the definition in this specification shall prevail.

[0034] The theories or mechanisms described and disclosed herein, whether correct or incorrect, should not limit the scope of the present invention in any way, that is, the present invention can be implemented without being limited by any specific theory or mechanism.

[0035] Herein, all features such as values, quantities, contents and concentrations defined in the form of numerical ranges or percentage ranges are for simplicity and convenience only. Accordingly, the description of numerical ranges or percentage ranges should be considered to have included and specifically disclosed all possible secondary ranges and individual values ​​within the range (including integers and fractions).

[0036] In this document, unless otherwise specified, “includes,” “including,” “contains,” “has,” or similar terms cover the meanings of “consisting of” and “mainly consisting of,” for example, “A includes a” covers the meanings of “A includes a and other” and “A only includes a.”

[0037] In this document, in order to make the description concise, not all possible combinations of various technical features in various embodiments or examples are described. Therefore, as long as there is no contradiction in the combination of these technical features, the various technical features in various embodiments or examples can be combined arbitrarily, and all possible combinations should be considered to be within the scope of this specification.

[0038] The present invention will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not intended to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall within the scope limited by the appended claims of the application equally.

[0039] The following examples use conventional instruments and equipment in the art. The experimental methods in the following examples where specific conditions are not specified are usually carried out under conventional conditions or under conditions recommended by the manufacturer. The various raw materials used in the following examples are conventional commercial products unless otherwise specified, and their specifications are conventional specifications in the art. In the specification of the present invention and the following examples, unless otherwise specified, "%" means weight percentage, "part" means weight part, and ratio means weight ratio.

[0040] Example 1

[0041] A method for preparing a Pt nanoparticle-loaded Fe-based MOF photocatalyst comprises the following steps:

[0042] Weigh 54.3 mg 2-aminoterephthalic acid and 162 mg FeCl 3 6H 2O was added to 30 mL of DMF and stirred for 30 minutes to obtain a mixture; the mixture was hydrothermaled in a polytetrafluoroethylene liner (50 mL) at 110° C. for 48 hours to obtain a reaction precipitate; after the reaction precipitate was cooled to room temperature, it was separated from the reaction mixture by suction filtration and thoroughly washed with DMF, ethanol and water to remove any unreacted raw materials. Finally, the obtained solid was dried in a freeze dryer for 6 hours to obtain NH 2 -MIL-101(Fe) powder;

[0043] The obtained 0.133 g NH 2 -MIL-101(Fe) powder was added to 20 mL of deionized water to form a mixed solution, and 100 uL of 10 mg / mL H 2 PtCl 6 6H 2 O aqueous solution, stir evenly and add 1.5mL, 0.1mol / L NaBH 4 The aqueous solution was used as a reducing agent and 5 mg of citric acid as a stabilizer, and finally Pt nanoparticles loaded with Fe-based MOF photocatalyst were obtained.

[0044] Example 2

[0045] A method for preparing a Pt nanoparticle-loaded Fe-based MOF photocatalyst comprises the following steps:

[0046] Weigh 54.3 mg 2-aminoterephthalic acid and 162 mg FeCl 3 6H 2 O was added to 30 ml of DMF and stirred for 30 minutes to obtain a mixture; the mixture was hydrothermaled at 110° C. for 48 hours in a polytetrafluoroethylene liner (50 mL) to obtain a reaction precipitate; after the reaction precipitate was cooled to room temperature, it was separated from the reaction mixture by suction filtration and thoroughly washed with DMF, ethanol and water to remove any unreacted raw materials. Finally, the obtained solid was dried in a freeze dryer for 6 hours to obtain NH 2 -MIL-101(Fe) powder;

[0047] The obtained 0.133 g NH 2 -MIL-101(Fe) powder was added to 20 mL of deionized water to form a mixed solution, and 300 uL of 10 mg / mL H 2 PtCl 6 6H 2 O aqueous solution, stir evenly and add 1.5mL, 0.1mol / L NaBH 4The aqueous solution was used as a reducing agent and 5 mg of citric acid as a stabilizer, and finally Pt nanoparticles loaded with Fe-based MOF photocatalyst were obtained.

[0048] Example 3

[0049] A method for preparing a Pt nanoparticle-loaded Fe-based MOF photocatalyst comprises the following steps:

[0050] Weigh 54.3 mg 2-aminoterephthalic acid and 162 mg FeCl 3 6H 2 O was added to 30 ml of DMF and stirred for 30 minutes to obtain a mixture; the mixture was hydrothermaled at 110° C. for 48 hours in a polytetrafluoroethylene liner (50 mL) to obtain a reaction precipitate; after the reaction precipitate was cooled to room temperature, it was separated from the reaction mixture by suction filtration and thoroughly washed with DMF, ethanol and water to remove any unreacted raw materials. Finally, the obtained solid was dried in a freeze dryer for 6 hours to obtain NH 2 -MIL-101(Fe) powder;

[0051] The obtained 0.133 g NH 2 -MIL-101(Fe) powder was added to 20 mL of deionized water to form a mixed solution, and 500 uL of 10 mg / mL H 2 PtCl 6 6H 2 O aqueous solution, stir evenly and add 1.5mL, 0.1mol / L NaBH 4 The aqueous solution was used as a reducing agent and 5 mg of citric acid as a stabilizer, and finally Pt nanoparticles loaded with Fe-based MOF photocatalyst were obtained.

[0052] Example 4

[0053] A method for preparing a Pt nanoparticle-loaded Fe-based MOF photocatalyst comprises the following steps:

[0054] Weigh 54.3 mg 2-aminoterephthalic acid and 162 mg FeCl 3 6H 2 O was added to 30 ml of DMF and stirred for 30 minutes to obtain a mixture; the mixture was hydrothermaled at 110° C. for 48 hours in a polytetrafluoroethylene liner (50 mL) to obtain a reaction precipitate; after the reaction precipitate was cooled to room temperature, it was separated from the reaction mixture by suction filtration and thoroughly washed with DMF, ethanol and water to remove any unreacted raw materials. Finally, the obtained solid was dried in a freeze dryer for 6 hours to obtain NH 2 -MIL-101(Fe) powder;

[0055] The obtained 0.133 g NH 2 -MIL-101(Fe) powder was added to 20 mL of deionized water to form a mixed solution, and 700 uL of 10 mg / mL H 2 PtCl 6 6H 2 O aqueous solution, stir evenly and add 1.5mL, 0.1mol / L NaBH 4 The aqueous solution was used as a reducing agent and 5 mg of citric acid as a stabilizer, and finally Pt nanoparticles loaded with Fe-based MOF photocatalyst were obtained.

[0056] Example 5

[0057] A method for preparing a Pt nanoparticle-loaded Fe-based MOF photocatalyst comprises the following steps:

[0058] Weigh 54.3 mg 2-aminoterephthalic acid and 162 mg FeCl 3 6H 2 O was added to 30 ml of DMF and stirred for 30 minutes to obtain a mixture; the mixture was hydrothermaled at 110° C. for 48 hours in a polytetrafluoroethylene liner (50 mL) to obtain a reaction precipitate; after the reaction precipitate was cooled to room temperature, it was separated from the reaction mixture by suction filtration and thoroughly washed with DMF, ethanol and water to remove any unreacted raw materials. Finally, the obtained solid was dried in a freeze dryer for 6 hours to obtain NH 2 -MIL-101(Fe) powder;

[0059] The obtained 0.133 g NH 2 -MIL-101(Fe) powder was added to 20 mL of deionized water to form a mixed solution, and 900 uL of 10 mg / mL H 2 PtCl 6 6H 2 O aqueous solution, stir evenly and add 1.5mL, 0.1mol / L NaBH 4 The aqueous solution was used as a reducing agent and 5 mg of citric acid as a stabilizer, and finally Pt nanoparticles loaded with Fe-based MOF photocatalyst were obtained.

[0060] Example 6

[0061] A method for preparing a Pt nanoparticle-loaded Fe-based MOF photocatalyst comprises the following steps:

[0062] Weigh 54.3 mg 2-aminoterephthalic acid and 162 mg FeCl 3 6H 2O was added to 30 mL of DMF and stirred for 30 minutes to obtain a mixture; the mixture was hydrothermaled in a polytetrafluoroethylene liner (50 mL) at 110° C. for 48 hours to obtain a reaction precipitate; after the reaction precipitate was cooled to room temperature, it was separated from the reaction mixture by suction filtration and thoroughly washed with DMF, ethanol and water to remove any unreacted raw materials, and finally, the obtained solid was dried in a freeze dryer for 6 hours to obtain NH 2 -MIL-101(Fe) powder.

[0063] Example 7

[0064] A method for preparing a Pt nanoparticle-loaded Fe-based MOF photocatalyst comprises the following steps:

[0065] Weigh 55 mg 2-aminoterephthalic acid and 162 mg FeCl 3 6H 2 O was added to 30 mL of DMF and stirred for 30 minutes to obtain a mixture; the mixture was hydrothermaled in a polytetrafluoroethylene liner (50 mL) at 110° C. for 48 hours to obtain a reaction precipitate; after the reaction precipitate was cooled to room temperature, it was separated from the reaction mixture by suction filtration and thoroughly washed with DMF, ethanol and water to remove any unreacted raw materials. Finally, the obtained solid was dried in a freeze dryer for 7 hours to obtain NH 2 -MIL-101(Fe) powder;

[0066] The prepared 0.135 g NH 2 -MIL-101(Fe) powder was added to 22 mL of deionized water to form a mixed solution, and 100 uL of 10 mg / mL H 2 PtCl 6 6H 2 O aqueous solution, stir evenly and add 1.5mL, 0.1mol / L NaBH 4 The aqueous solution was used as a reducing agent and 5 mg of citric acid as a stabilizer, and finally Pt nanoparticles loaded with Fe-based MOF photocatalyst were obtained.

[0067] Take 100 mg of the samples prepared in Examples 1 to 6 and perform X-ray diffraction test. Figure 1 As shown, the XRD patterns of the composites are similar to those of NH 2 -The main peak of MIL-101(Fe) simulated phase is consistent with that of the composite material.

[0068] Take 30 mg of the sample prepared in Example 4 and perform SEM test. Figure 2 As shown, it exhibits a regular and slightly rough octahedral morphology with an average diameter of about 500 nm.

[0069] Take 30 mg of the sample prepared in Example 4 and perform TEM test. Figure 3 As shown, it exhibits a regular octahedral morphology with an average diameter of about 500 nm.

[0070] Take 30 mg of the sample prepared in Example 4 and perform high-resolution TEM test. Figure 4 As shown, the surface is loaded with Pt nanoparticles, and the lattice spacing is about 0.22 nm, which belongs to the (111) crystal plane of the Pt nanoparticles.

[0071] Take 50 mg of the sample prepared in Example 4 and mix with an equal amount of NH 2 -MIL-101(Fe), UV-visible absorption spectrum. Figure 5 As shown in the figure, the light absorption of the composite photocatalyst Pt@NM-101(Fe) at 200-800nm ​​is further improved by the in-situ loading of Pt nanoparticles. This is because when Pt metal nanoparticles are exposed to light, the electric field of the light polarizes the charge distribution, causing the charges to accumulate on the surface of the particles, thereby forming a local electric field on the surface, further promoting light absorption and thereby improving the efficiency of photocatalytic conversion of nitrogen to synthesize ammonia.

[0072] Take 10 mg of the samples prepared in Example 4 and Example 6 and perform transient photocurrent response spectrum test. Figure 6 As shown, Pt@NM-101(Fe)-4 has a stronger photocurrent density, indicating that Pt@NM-101(Fe)-4 has a stronger charge migration rate.

[0073] Take 10 mg of the samples prepared in Example 4 and Example 6 and perform transient photocurrent response spectrum test. Figure 7 As shown, Pt@NM-101(Fe)-4 has a lower interfacial charge transfer resistance, indicating that Pt@NM-101(Fe)-4 has a stronger charge migration rate.

[0074] Photocatalytic synthesis of ammonia activity test process: Weigh 30 mg of samples from Examples 1 to 6 respectively, set up six experiments, disperse the six samples in a quartz photocatalytic reactor containing 100 mL of deionized water and connect them to a circulating water cooling system to maintain a controlled temperature of 25°C. The light source is a 300W xenon lamp (282 mW·cm -2 First, the dispersion was heated in the dark with high purity N 2 (80mL·min -1 ) was bubbled and magnetically stirred for 30 min to make the N 2The solution was saturated and the oxygen in the reactor was driven out. Then, the xenon light source was turned on, and 1 mL of the dispersion was taken out every 60 min. The photocatalyst was separated by centrifugation at 5000 rpm to obtain a clear solution. The NH 3 The concentration of Figure 8 The curve shown. Figure 8 It can be seen that the samples of Examples 1 to 5 are different from the unmodified NH 2 -MIL-101(Fe) has significantly improved the efficiency of photocatalytic conversion of nitrogen to ammonia. 4 + The yield was significantly improved, and Example 4 was the best, with its activity increased by 4.2 times.

[0075] Utilizing NH 2 -MIL-101(Fe) as a carrier, the material has excellent light absorption and photosensitivity properties, can effectively absorb solar energy and convert it into photogenerated carriers. In addition, Pt nanoparticles in situ dispersed NH 2 -MIL-101(Fe), by using 2 The ligand of the group (NH 2 -BDC) bridges Pt nanoparticles to metal organic frameworks (MOFs) to precisely construct directional electron transport channels. This effectively reduces the interfacial charge transfer resistance and inhibits the recombination of photogenerated carriers, thereby enhancing the N 2 Adsorption and activation of molecules. 2 -MIL-101(Fe) composite photocatalyst to increase the yield of photocatalytic conversion of nitrogen to synthesize ammonia, significantly solving the high energy consumption and environmental pollution problems of traditional industrial nitrogen fixation. The preparation process of this method is simple, low-cost, and the raw materials are easily available.

[0076] The above contents are only for explaining the technical idea of ​​the present invention and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution in accordance with the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A method for preparing a Pt nanoparticle-loaded Fe-based MOF photocatalyst, characterized in that: The following steps are involved: Adding 2-aminoterephthalic acid and FeCl3·6H2O into a solvent and mixing them to obtain a mixture; After the mixture is subjected to a hydrothermal reaction, the obtained reaction precipitate is post-treated to obtain NH2-MIL-101(Fe) powder; NH2-MIL-101(Fe) powder and water are mixed to obtain a mixed solution; hexahydrate chloroplatinic acid aqueous solution, a reducing agent and a stabilizer are sequentially dropped into the mixed solution to obtain a Pt nanoparticle-loaded Fe-based MOF photocatalyst.

2. The method for preparing a Pt nanoparticle-supported Fe-based MOF photocatalyst according to claim 1, characterized in that: The usage ratio of the 2-aminoterephthalic acid, FeCl3·6H2O and the solvent is (54.3-55.0) mg: (162-162.5) mg: (30-31) mL.

3. The method for preparing a Pt nanoparticle-loaded Fe-based MOF photocatalyst according to claim 1, characterized in that: The solvent is DMF.

4. The method for preparing a Pt nanoparticle-supported Fe-based MOF photocatalyst according to claim 1, characterized in that: The temperature of the hydrothermal reaction is 110° C. and the time is 48 hours.

5. The method for preparing a Pt nanoparticle-supported Fe-based MOF photocatalyst according to claim 1, characterized in that: The post-treatment is cooling, filtering, washing and freeze-drying in sequence; the freeze-drying treatment time is 6 to 7 hours.

6. The method for preparing a Pt nanoparticle-supported Fe-based MOF photocatalyst according to claim 1, characterized in that: The dosage ratio of the NH2-MIL-101(Fe) powder and water is (133-135) mg: (20-22) mL.

7. The method for preparing a Pt nanoparticle-supported Fe-based MOF photocatalyst according to claim 1, characterized in that: The reducing agent is a sodium borohydride aqueous solution; and the stabilizing agent is citric acid.

8. The method for preparing a Pt nanoparticle-supported Fe-based MOF photocatalyst according to claim 1, characterized in that: The dosage ratio of the hexahydrate chloroplatinic acid aqueous solution to the mixed solution is (0.1-0.7) mL: (20-22) mL; the dosage ratio of the reducing agent, the stabilizer and the mixed solution is 1.5 mL: 5 mg: (20-22) mL; The concentration of the chloroplatinic acid hexahydrate aqueous solution is 10 to 10.5 mg / mL.

9. A Pt nanoparticle-loaded Fe-based MOF photocatalyst, characterized in that: The preparation method is described in any one of claims 1 to 9.

10. Use of the Pt nanoparticle-loaded Fe-based MOF photocatalyst according to claim 9 in photocatalytic conversion of nitrogen to synthesize ammonia.

Images