Synthetic method for preparing efficient photocatalyst by embedding platinum nanocluster into PCN-224-BA framework

Abstract

The invention discloses a synthesis method for preparing a high-efficiency photocatalyst by embedding platinum nanoclusters into a PCN-224-BA framework, and belongs to the technical field of catalyst preparation, and the synthesis method comprises the following steps: coordinating-BA molecules on metal nodes of a metal organic framework PCN-224, then chelating platinum atoms at a porphyrin center of a metal organic framework material, and reducing with hydrogen to obtain the high-efficiency photocatalyst. According to the synthetic method for preparing the efficient photocatalyst by embedding the platinum nanocluster into the PCN-224-BA framework, PtSAs and PCN-224-BA are heated in a hydrogen atmosphere for reduction reaction, so that the platinum nanocluster synthesized by the catalyst is uniform in size, and the particle size of the platinum nanocluster can be controlled. The catalytic activity of the catalyst is not only superior to that of the most advanced MOFs-based photocatalyst, but also superior to that of most other promising photocatalysts, and the catalyst is high in catalytic activity and better in stability.

Description

Technical Field

[0001] The invention relates to the technical field of catalyst preparation, and in particular to a synthesis method for preparing a high-efficiency photocatalyst by embedding platinum nanoclusters into a PCN-224-BA framework. Background Art

[0002] Photocatalytic hydrogen evolution reaction plays a vital role in the development of emerging sustainable energy conversion and storage technologies. Various photocatalysts, such as titanium dioxide, cadmium sulfide, C 3 N 4 etc., have been widely used in photocatalytic hydrogen evolution reaction. However, most reported photocatalysts have insufficient photocatalytic hydrogen evolution reaction activity, which is due to their fast photogenerated electron-hole recombination and lack of catalytic active sites. Platinum (Pt) is currently the best co-catalyst, which not only effectively reduces the photogenerated electron-hole recombination, but also acts as a catalytic active center to significantly improve the photocatalytic activity. The size of platinum has a huge impact on the photocatalytic activity, however, its size is difficult to control, resulting in the generally low activity of current platinum-loaded catalysts. Summary of the invention

[0003] The purpose of the present invention is to provide a synthesis method for preparing an efficient photocatalyst by embedding platinum nanoclusters into a PCN-224-BA framework, so as to solve the problem that the size of platinum has a great influence on the photocatalytic activity and its size is difficult to control, resulting in the generally low activity of current platinum-loaded catalysts.

[0004] To achieve the above-mentioned purpose, the present invention provides a synthesis method for preparing an efficient photocatalyst by embedding platinum nanoclusters into a PCN-224-BA framework, wherein -BA molecules are coordinated on the metal nodes of the metal organic framework PCN-224, and then platinum atoms are chelated on the porphyrin center of the metal organic framework material, and reduced with hydrogen to obtain an efficient photocatalyst; The specific preparation steps are as follows: S1, zirconium salt and organic ligand react in a suitable solvent, and after heating at a certain temperature, the target PCN-224-BA is obtained; S2. Prepare an aqueous solution containing an appropriate amount of platinum ions, i.e., a platinum precursor solution, wherein the concentration of the platinum precursor solution is adjusted according to the desired final loading amount; disperse PCN-224-BA in water, and then add it to the platinum precursor solution, and perform ultrasonic treatment and heating reaction to allow the platinum ions to fully contact and adsorb into the pores or surface of PCN-224-BA; S3, washing the solution prepared in S2 with deionized water and acetone and drying to remove unreacted platinum precursor; S4. Heating in a hydrogen atmosphere to carry out a reduction reaction to achieve the conversion of the platinum precursor into metallic platinum nanoclusters, thereby obtaining platinum nanoclusters of an ideal size and ultimately obtaining a highly efficient photocatalyst.

[0005] Preferably, in the above-mentioned method for preparing a highly efficient photocatalyst by embedding platinum nanoclusters into a PCN-224-BA framework, the reaction raw materials in S1 mainly include meso-tetrakis(4-carboxyphenyl)porphine (H 2 TCPP), benzoic acid (BA) and zirconium oxide octahydrate (ZrOCl 2 8H 2 O) and N,N-dimethylformamide (DMF), meso-tetrakis(4-carboxyphenyl)porphine (H 2 TCPP), benzoic acid (BA) and zirconium oxide octahydrate in a mass ratio of 1:30-40:2-3; the specific details of the production operation are as follows: meso-tetrakis (4-carboxyphenyl) porphine (H 2 TCPP), benzoic acid (BA) and zirconium oxide octahydrate (ZrOCl 2 8H 2 O) is added to a reactor containing N,N-dimethylformamide (DMF), and the mixture is stirred at room temperature for 4-24 h.

[0006] Preferably, in the above-mentioned synthesis method for preparing a high-efficiency photocatalyst by embedding platinum nanoclusters into a PCN-224-BA framework, in step S1, after the mixture is stirred, it is placed in an oil bath and heated for a period of time and then centrifuged, the oil bath heating temperature is 80-100°C, and then washed with fresh DMF and acetone respectively, and the obtained nanoparticles are vacuum dried to obtain PCN-224-BA, and the drying temperature is 65-80°C.

[0007] Preferably, in the above-mentioned method for preparing a highly efficient photocatalyst by embedding platinum nanoclusters into a PCN-224-BA framework, the platinum precursor solution in step S2 is H 2 PtCl 6 6H 2 O aqueous solution, H 2 PtCl 6 6H 2 The concentration of O aqueous solution is 1-33 mg / mL.

[0008] Preferably, in the above-mentioned method for preparing a highly efficient photocatalyst by embedding platinum nanoclusters into a PCN-224-BA framework, in step S2, the mass ratio of PCN-224-BA to water is 1:100-300 mL, and PCN-224-BA is dispersed in water and then added to H 2 PtCl 6 6H2 O aqueous solution, and then ultrasonically treated for 0.5-2h. After ultrasonic treatment, the mixture was placed in an oil bath for heating reaction at 80-90°C, and then cooled.

[0009] Preferably, in the above-mentioned synthesis method for preparing a high-efficiency photocatalyst by embedding platinum nanoclusters into a PCN-224-BA framework, in step S3, the solution prepared in step S2 is washed and dried using deionized water and acetone, and the product obtained after removing the unreacted platinum precursor is PtSAs@PCN-224-BA.

[0010] Preferably, in the above-mentioned method for preparing a highly efficient photocatalyst by embedding platinum nanoclusters into a PCN-224-BA framework, in step S4, the reduction temperature in hydrogen is 170-190 o C, reduction time is 0.5-2h.

[0011] A highly efficient photocatalyst with platinum nanoclusters embedded in the PCN-224-BA framework was prepared using the above-mentioned synthesis method.

[0012] A highly efficient photocatalyst with platinum nanoclusters embedded in the PCN-224-BA framework for photocatalytic hydrogen production.

[0013] Therefore, the present invention adopts the above-mentioned method of synthesizing a platinum nanocluster embedded in the PCN-224-BA framework to prepare an efficient photocatalyst, which has a simple process, strong operability, and broad application prospects; by heating PtSAs@PCN-224-BA under a hydrogen atmosphere for reduction reaction, the size of the platinum nanocluster synthesized by the catalyst is uniform and its particle size can be controlled. The catalytic activity of the catalyst is not only better than the most advanced MOFs-based photocatalyst, but also better than most other promising photocatalysts. With ascorbic acid as a sacrificial agent, under visible light conditions, the catalytic activity of PtNCs@PCN-224-BA is as high as 4062μmol / g / h, and the stability exceeds 40 hours.

[0014] The technical solution of the present invention is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a field emission scanning electron microscope image of PCN-224-BA prepared in Example 1; Figure 2 This is a transmission electron microscopy image of PtNCs@PCN-224-BA prepared in Example 1; Figure 3 This is a transmission electron microscopy image of PtNCs@PCN-224-OH prepared in Example 2; Figure 4 This is the transmission electron microscopy image of PtNCs@PCN-224-AA prepared in Example 3; Figure 5 PtNPs@PCN-224-BA-NaBH prepared in Example 4 4 Transmission electron micrograph of Figure 6 This is a transmission electron microscopy image of PtNPs@PCN-224-BA-PD prepared in Example 5; Figure 7 The photocatalytic hydrogen evolution effect diagram of PtNCs@PCN-224-BA, PtNCs@PCN-224-OH and PtNCs@PCN-224-AA prepared in Examples 1-3; Figure 8 This is a diagram showing the long-term photocatalytic hydrogen evolution effect of PtNCs@PCN-224-BA prepared in Example 1. DETAILED DESCRIPTION

[0016] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] 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", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0018] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0019] Metal-organic frameworks are porous materials with high porosity, high specific surface area, adjustable structure and function. They have been used in photocatalytic hydrogen evolution after loading platinum. However, due to the difficulty in controlling the size of platinum particles, their activity is still low. In order to solve the problem of the difficulty in controlling the size of platinum and ultimately solve the problem of low photocatalytic activity, we use the structural characteristics of porphyrin-based metal-organic frameworks that are easy to post-modify, modify molecular fences of different sizes inside them, form molecular compartments of different sizes, and combine them with abundant chelating sites inside to limit the rapid growth of platinum particles, and finally obtain efficient photocatalytic hydrogen production catalysts.

[0020] The present application provides a method for synthesizing a platinum nanocluster embedded in a PCN-224-BA framework to prepare an efficient photocatalyst, wherein -BA molecules are coordinated on the metal nodes of the metal organic framework PCN-224, and then platinum atoms are chelated on the porphyrin center of the metal organic framework material, and reduced with hydrogen to obtain an efficient photocatalyst; The specific preparation steps are as follows: S1, zirconium salt and organic ligand react in a suitable solvent, and after heating at a certain temperature, the target PCN-224-BA is obtained; S2. Prepare an aqueous solution containing an appropriate amount of platinum ions, i.e., a platinum precursor solution, wherein the concentration of the platinum precursor solution is adjusted according to the desired final loading amount; disperse PCN-224-BA in water, and then add it to the platinum precursor solution, and perform ultrasonic treatment and heating reaction to allow the platinum ions to fully contact and adsorb into the pores or surface of PCN-224-BA; S3, washing the solution prepared in S2 with deionized water and acetone and drying to remove unreacted platinum precursor; S4. Heating in a hydrogen atmosphere to carry out a reduction reaction to achieve the conversion of the platinum precursor into metallic platinum nanoclusters, thereby obtaining platinum nanoclusters of an ideal size and ultimately obtaining a highly efficient photocatalyst.

[0021] To further optimize the above technical solution, the reaction raw materials in S1 mainly include meso-tetrakis(4-carboxyphenyl)porphine (H 2 TCPP), benzoic acid (BA) and zirconium oxide octahydrate (ZrOCl 2 8H 2 O) and N,N-dimethylformamide (DMF), meso-tetrakis(4-carboxyphenyl)porphine (H 2 TCPP), benzoic acid (BA) and zirconium oxide octahydrate in a mass ratio of 1:30-40:2-3; the specific details of the production operation are as follows: meso-tetrakis (4-carboxyphenyl) porphine (H 2 TCPP), benzoic acid (BA) and zirconium oxide octahydrate (ZrOCl 2 8H 2O) is added to a reactor containing N,N-dimethylformamide (DMF), and the mixture is stirred at room temperature for 4-24 h.

[0022] To further optimize the above technical solution, in step S1, after the mixture is stirred, it is placed in an oil bath and heated for a period of time and then centrifuged. The oil bath heating temperature is 80-100°C, and then washed with fresh DMF and acetone respectively. The obtained nanoparticles are vacuum dried to obtain PCN-224-BA, and the drying temperature is 65-80°C.

[0023] To further optimize the above technical solution, the platinum precursor solution in step S2 is H 2 PtCl 6 6H 2 O aqueous solution, H 2 PtCl 6 6H 2 The concentration of O aqueous solution is 1-33 mg / mL.

[0024] Preferably, in the above-mentioned method for preparing a highly efficient photocatalyst by embedding platinum nanoclusters into a PCN-224-BA framework, in step S2, the mass ratio of PCN-224-BA to water is 1:100-300 mL, and PCN-224-BA is dispersed in water and then added to H 2 PtCl 6 6H 2 O aqueous solution, and then ultrasonically treated for 0.5-2h. After ultrasonic treatment, the mixture was placed in an oil bath for heating reaction at 80-90°C, and then cooled.

[0025] In order to further optimize the above technical solution, in step S3, the solution prepared in step S2 is washed with deionized water and acetone and dried, and the product obtained after removing the unreacted platinum precursor is PtSAs@PCN-224-BA.

[0026] To further optimize the above technical solution, in step S4, the reduction temperature in hydrogen is 170-190 o C, reduction time is 0.5-2h.

[0027] A highly efficient photocatalyst with platinum nanoclusters embedded in the PCN-224-BA framework was prepared using the above-mentioned synthesis method.

[0028] A highly efficient photocatalyst with platinum nanoclusters embedded in the PCN-224-BA framework for photocatalytic hydrogen production.

[0029] Specifically, the molecules coordinated on the metal nodes of the metal organic framework PCN-224 include, in addition to -BA molecules, also -OH and -AA molecules of different sizes.

[0030] Example 1 Preparation of metal organic framework PCN-224-BA: Meso-tetrakis(4-carboxyphenyl)porphine (H 2 TCPP) (100 mg, TCI, 97%), benzoic acid (BA) (3.3 g, TCI, 99%) and zirconium oxide octahydrate (ZrOCl 2 8H 2 O) (300 mg, Wako, 99%) was added to a 300 mL round-bottom flask containing 100 mL N,N-dimethylformamide (DMF) (99.5%, Wako). The mixture was first stirred at room temperature overnight to ensure that the reactants were completely dissolved. Then, the mixture was stirred at 90 °C for 5 h at 300 rpm, centrifuged, and then washed with fresh DMF and acetone three times respectively. The resulting PCN-224-BA nanoparticles were heated at 70 °C under vacuum overnight, see Figure 1 shown.

[0031] Preparation of PtSAs@PCN-224-BA catalyst: PCN-224-BA (100 mg) was first dispersed in 20 mL of water and 1.67 mL of H 2 PtCl 6 6H 2 O aqueous solution (3 mg / mL), after ultrasonication at room temperature for one hour, it was placed in an oil bath and heated at 90 °C overnight. After cooling, it was washed twice with deionized water and acetone respectively, and then vacuum dried. The dried sample PtSAs@PCN-224-BA was heated at 180 o Pure H 2 After 1 hour of reduction, PCN-224-BA encapsulating platinum nanoclusters was obtained, named PtNCs@PCN-224-BA, see Figure 2 shown.

[0032] Example 2 Preparation of metal organic framework PCN-224-OH: 133 mg PCN-224-BA was dispersed in 26 mL DMF, and 2.4 mL concentrated hydrochloric acid was added. Subsequently, it was heated at 120 ° C overnight at 300 rpm, cooled, centrifuged, washed three times with fresh DMF and acetone, and then vacuum dried. The obtained sample is PCN-224-BA after the benzoic acid is removed, and is called PCN-224-OH.

[0033] Preparation of PtNCs@PCN-224-OH catalyst: PCN-224-OH (100 mg) was first dispersed in 20 mL of water and 1.67 mL of H 2 PtCl 6 6H 2 O aqueous solution (3 mg / mL), after ultrasonication at room temperature for one hour, it was placed in an oil bath and heated at 90°C overnight. After cooling, it was washed twice with deionized water and acetone respectively, and then vacuum dried. The dried sample was heated at 180 o Pure H 2 After 1 h of reduction, PCN-224-OH encapsulated with platinum nanoclusters, named PtNCs@PCN-224-OH, refer to Figure 3 shown.

[0034] Example 3 Preparation of metal organic framework PCN-224-AA: 150 mg PCN-224-OH was dispersed in 15 mL DMF, and 83 μL concentrated acetic acid was added. Subsequently, it was heated at 65 °C overnight at 300 rpm, cooled, centrifuged, washed three times with fresh DMF and acetone, and then vacuum dried. The obtained sample was PCN-224-AA with an acetic acid fence, which was called PCN-224-AA.

[0035] Preparation of PtNCs@PCN-224-AA catalyst: PCN-224-AA (100 mg) was first dispersed in 20 mL of water and 1.67 mL of H 2 PtCl 6 6H 2 O aqueous solution (3 mg / mL), after ultrasonication at room temperature for one hour, it was placed in an oil bath and heated at 90°C overnight. After cooling, it was washed twice with deionized water and acetone respectively, and then vacuum dried. The dried sample was heated at 180 o Pure H 2 After 1 h of reduction, PCN-224-AA encapsulating platinum nanoclusters, named PtNCs@PCN-224-AA, was obtained. Figure 4 shown.

[0036] Example 4 Catalyst PtNPs@PCN-224-BA-NaBH 4 Preparation: First, PtSAs@PCN-224-BA (100 mg) was dispersed in 20 mL of ethanol and 4 mL of 1 mg / mL NaBH was added. 4After 2 h of ultrasonication at room temperature, the solution was centrifuged, washed twice with ethanol, and dried under vacuum, named PtNPs@PCN-224-BA-NaBH 4 , see Figure 5 shown.

[0037] Example 5 Preparation of catalyst PtNPs@PCN-224-BA-PD: 50 mg PCN-224-BA and 740 mg ascorbic acid were dispersed in 21 mL water and ultrasonicated for 0.5 h, followed by the addition of a certain amount of chloroplatinic acid aqueous solution. After irradiation with a 300 W xenon lamp for 4 h under vacuum conditions, centrifugation, washing with ethanol and acetone several times, and vacuum drying, named PtNPs@PCN-224-BA-PD, see Figure 6 shown.

[0038] Example 6 See also Figure 7-8 As shown, the performance evaluation of the catalyst for photocatalytic hydrogen evolution is: 5 mg of photocatalyst and 740 mg of ascorbic acid sacrificial agent were added to 21 mL of water and transferred to a 170 mL reactor. The entire reaction system was evacuated. After turning on the 300 W Xe lamp (> 400 nm), the reaction began. The sacrificial agent of the reaction can also be replaced by triethanolamine. The hydrogen produced by photocatalysis was determined by gas chromatography.

[0039] The sizes of platinum clusters in PtNCs@ PCN-224-OH, PtNCs@ PCN-224-AA, and PtNCs@ PCN-224-BA in the examples are 1.6 nm, 1.4 nm, and 0.9 nm, respectively. In particular, the size of platinum clusters in PtNCs@ PCN-224-BA is very uniform. However, in most Pt-loaded catalysts in the literature, the size of Pt is large and non-uniform. The comparative materials in the present invention, including the sample PtNPs@PCN-224-BA-NaBH reduced with sodium borohydride, 4 The sizes of Pt in the samples PtNPs@PCN-224-BA-PD and photo-deposited samples are non-uniform and larger, with average sizes of 2.95nm and 2.05nm, respectively.

[0040] Under visible light irradiation, ascorbic acid was used as a sacrificial agent, and the five photocatalysts PtNCs@PCN-224-OH, PtNCs@PCN-224-AA, PtNCs@PCN-224-BA, PtNPs@PCN-224-BA-NaBH 4The photocatalytic activities of PtNCs@PCN-224-BA-PD are 2647, 2100, 4062, 1899, and 139 μmol / g / h, respectively. The stability of PtNCs@PCN-224-BA exceeds 40 h.

[0041] In the embodiments, the various reagents are increased in proportion to carry out large-scale production, and the obtained materials have the same effect. The same result can also be obtained by changing the feeding ratio within a small range.

[0042] Therefore, the present invention adopts the above-mentioned method of synthesizing a platinum nanocluster embedded in the PCN-224-BA framework to prepare an efficient photocatalyst. By heating PtSAs@PCN-224-BA under a hydrogen atmosphere for reduction reaction, the size of the platinum nanocluster synthesized by the catalyst is uniform and its particle size can be controlled. The catalytic activity of the catalyst is not only better than the most advanced MOFs-based photocatalysts, but also better than most other promising photocatalysts. With ascorbic acid as a sacrificial agent, under visible light conditions, the catalytic activity of PtNCs@PCN-224-BA is as high as 4062μmol / g / h, and the stability exceeds 40 hours.

[0043] 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 highly efficient photocatalyst by embedding platinum nanoclusters into a PCN-224-BA framework, characterized in that: -BA molecules were coordinated on the metal nodes of the metal organic framework PCN-224, followed by chelation of platinum atoms on the porphyrin center of the metal organic framework material and reduction with hydrogen to obtain an efficient photocatalyst; The specific preparation steps are as follows: S1, zirconium salt and organic ligand react in a suitable solvent, and after heating at a certain temperature, the target PCN-224-BA is obtained; S2. Prepare an aqueous solution containing an appropriate amount of platinum ions, i.e., a platinum precursor solution, wherein the concentration of the platinum precursor solution is adjusted according to the desired final loading amount; disperse PCN-224-BA in water, and then add it to the platinum precursor solution, and perform ultrasonic treatment and heating reaction to allow the platinum ions to fully contact and adsorb into the pores or surface of PCN-224-BA; S3, washing the solution prepared in S2 with deionized water and acetone and drying to remove unreacted platinum precursor; S4. Heating in a hydrogen atmosphere to carry out a reduction reaction to achieve the conversion of the platinum precursor into metallic platinum nanoclusters, thereby obtaining platinum nanoclusters of an ideal size and ultimately obtaining a highly efficient photocatalyst.

2. The method for preparing a highly efficient photocatalyst by embedding platinum nanoclusters into a PCN-224-BA framework according to claim 1, characterized in that: The reaction raw materials in S1 mainly include meso-tetrakis(4-carboxyphenyl)porphine (H2TCPP), benzoic acid (BA), zirconium oxide octahydrate (ZrOCl2 ·8H2O) and N,N-dimethylformamide (DMF), and the mass ratio of meso-tetrakis(4-carboxyphenyl)porphine (H2TCPP), benzoic acid (BA) and zirconium oxide octahydrate is 1:30-40:2-3; the specific details of the operation during the preparation are as follows: meso-tetrakis(4-carboxyphenyl)porphine (H2TCPP), benzoic acid (BA) and zirconium oxide octahydrate (ZrOCl2 ·8H2O) are added to a reactor containing N,N-dimethylformamide (DMF), and the mixture is stirred at room temperature for 4-24 hours.

3. The method for preparing a highly efficient photocatalyst by embedding platinum nanoclusters into a PCN-224-BA framework according to claim 2, characterized in that: In step S1, after the mixture is stirred, it is placed in an oil bath and heated for a period of time, and then centrifuged. The oil bath heating temperature is 80-100°C, and then washed with fresh DMF and acetone respectively. The obtained nanoparticles are vacuum dried to obtain PCN-224-BA. The drying temperature is 65-80°C.

4. The method for preparing a highly efficient photocatalyst by embedding platinum nanoclusters into a PCN-224-BA framework according to claim 3, characterized in that: The platinum precursor solution in step S2 is a H2PtCl6·6H2O aqueous solution, and the concentration of the H2PtCl6·6H2O aqueous solution is 1-33 mg / mL.

5. The method for preparing a highly efficient photocatalyst by embedding platinum nanoclusters into a PCN-224-BA framework according to claim 4, characterized in that: In the step S2, the mass ratio of PCN-224-BA to water is 1:100-300 mL when PCN-224-BA is dispersed in water, and then added to the H2PtCl6·6H2O aqueous solution, and ultrasonic treatment is performed for 0.5-2 h. After ultrasonic treatment, the mixture is placed in an oil bath for heating reaction at a temperature of 80-90° C., and then cooled.

6. The method for preparing a highly efficient photocatalyst by embedding platinum nanoclusters into a PCN-224-BA framework according to claim 5, characterized in that: In step S3, the solution prepared in step S2 is washed with deionized water and acetone and dried to remove unreacted platinum precursor, thereby obtaining the product PtSAs@PCN-224-BA.

7. The method for preparing a highly efficient photocatalyst by embedding platinum nanoclusters into a PCN-224-BA framework according to claim 6, characterized in that: In step S4, the reduction temperature in hydrogen is 170-190 o C, reduction time is 0.5-2h.

8. An efficient photocatalyst with platinum nanoclusters embedded in a PCN-224-BA framework, characterized by: It is prepared by the synthesis method described in any one of claims 1 to 7.

9. The high-efficiency photocatalyst of platinum nanoclusters embedded in the PCN-224-BA framework according to claim 8, characterized in that: Applied in photocatalytic hydrogen production.

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