Electron donor-acceptor polymer as well as preparation method and application thereof

Abstract

The invention discloses an electron donor-acceptor polymer as well as a preparation method and application thereof, and relates to the technical field of photocatalysis. According to the polymer, ethyl or sulfuryl is used as a side chain to modify a benzene ring to serve as an electron donor, anthraquinone is used as an electron acceptor, and alkynyl is used as an electron bridge to connect an electron donor unit and an electron acceptor unit. The obtained polymer is used for improving the stability of photocatalytic production of hydrogen peroxide by reducing the generation of superoxide free radicals and increasing the formation of oxygen center organic free radicals.

Description

Technical Field

[0001] The present invention relates to the field of photocatalysis technology, and more specifically to an electron donor-acceptor polymer and a preparation method and application thereof. Background Art

[0002] Hydrogen peroxide is one of the world's top 100 important chemicals and is widely used in the fields of medicine, disinfection, wastewater treatment, chemical synthesis, etc. Photocatalytic synthesis of hydrogen peroxide can utilize sustainable water and oxygen on the earth. This method has the characteristics of low energy consumption, simple equipment, and non-toxicity, making it an ideal choice for synthesizing hydrogen peroxide. The existing photocatalysts for synthesizing hydrogen peroxide are mainly organic photocatalysts, because compared with inorganic catalysts, organic catalysts show better performance. Moreover, organic catalysts can be modified at the molecular level to fine-tune the photophysical and photochemical processes during the photocatalytic synthesis of hydrogen peroxide. Although organic photocatalysts have high performance in the synthesis of hydrogen peroxide, their stability is usually unsatisfactory. This serious problem seriously restricts the practical application of organic photocatalysts in the photocatalytic synthesis of hydrogen peroxide.

[0003] D-π-A type conjugated polymer photocatalyst is a photocatalytic material composed of electron donors (D), electron bridges (π) and electron acceptors (A) alternately. In recent years, the application of D-π-A type conjugated polymers in the photocatalytic generation of hydrogen peroxide has become the focus of many scientific studies.

[0004] Prior art CN116178678 A discloses a bridged electron donor acceptor polymer and its preparation method and application, wherein the bridged electron donor acceptor polymer uses an alkynyl group as an electron bridge to connect the electron donor unit and the electron acceptor unit, wherein the electron donor unit is tetraphenylethylene, 2,4,6-triphenyltriazine or benzocarbazole, and the electron acceptor unit is anthraquinone or sulfoxide. By introducing an alkynyl group as an electron bridge, the recombination of photogenerated carriers is reduced, so that the bridged electron donor acceptor polymer can be used for photocatalytic production of hydrogen peroxide. However, the polymer of the prior art has poor stability as an organic photocatalyst, and the number of times it is reused in photocatalytic production of hydrogen peroxide is only 3 times, and then the performance drops significantly. Summary of the invention

[0005] The primary purpose of the present invention is to overcome the problem of poor stability of the existing bridged electron donor acceptor polymer when used as a photocatalyst for photocatalytic synthesis of hydrogen peroxide, and to provide a new electron donor acceptor polymer.

[0006] A further object of the present invention is to provide a method for preparing the electron donor-acceptor polymer.

[0007] Another object of the present invention is to provide the use of the electron donor-acceptor polymer in photocatalytic production of hydrogen peroxide.

[0008] Another object of the present invention is to provide a method for photocatalytically producing hydrogen peroxide.

[0009] The above-mentioned object of the present invention is achieved by the following technical solutions:

[0010] An electron donor-acceptor polymer having a structure shown in the following formula (I):

[0011]

[0012] in, is an electron donor unit; is the electron acceptor unit; For electronic bridge;

[0013] The electron donor unit is of formula (a-1) or (a-2):

[0014]

[0015] The electron acceptor unit is of formula (b):

[0016]

[0017] The electronic bridge is

[0018] p represents the site of connection to the electron acceptor unit, m represents the site of connection to the electron donor unit, and J and K represent the sites of connection to the electron bridge.

[0019] The electron donor-acceptor polymer of the present invention is a D-π-A type conjugated polymer with electron donors and acceptors alternately connected, wherein an alkynyl group is used as an electron bridge to connect the electron donor unit and the electron acceptor unit, the electron donor unit is an ethyl or sulfone group as a side chain modified benzene ring, and the electron acceptor unit is anthraquinone.

[0020] Preferably, the electron donor acceptor polymer has a structure as shown in the following formula (II):

[0021]

[0022] Preferably, the electron donor acceptor polymer has a structure as shown in the following formula (III):

[0023]

[0024] The present invention also protects a method for preparing the electron donor-acceptor polymer having the structure shown in the above formula (II), comprising the following steps: Obtained by polymerization reaction.

[0025] Preferably, the method for preparing the electron donor-acceptor polymer having the structure shown in the above formula (II) may include the following steps: It is obtained by reaction in the presence of a palladium catalyst, cuprous iodide and a base.

[0026] As a specific embodiment, the palladium catalyst can be tetrakis(triphenylphosphine)palladium and / or bis(triphenylphosphine)palladium chloride.

[0027] As a specific embodiment, the base is one or more of triethylamine, sodium carbonate, and potassium carbonate.

[0028] As a specific implementation manner, the reaction temperature is 70 to 90° C., and the reaction time is 24 to 48 hours.

[0029] As a specific implementation, the reaction atmosphere is an inert atmosphere. Specifically, the reaction atmosphere is a nitrogen atmosphere and / or an argon atmosphere.

[0030] As a specific implementation manner, the reaction is carried out in an organic solvent, and the organic solvent is one or more of dimethylacetamide, N-methylpyrrolidone, and dimethylformamide.

[0031] After the reaction, a post-treatment operation may be further included, and the post-treatment sequentially includes drying, grinding, ultrasonic dispersion, suction filtration and secondary drying steps.

[0032] The present invention also protects a method for preparing the electron donor-acceptor polymer represented by the above formula (III), comprising the following steps: It is obtained by polymerization reaction with electron acceptor 2,6-dibromoanthraquinone.

[0033] Preferably, the method for preparing the electron donor acceptor polymer represented by the above formula (III) may include the following steps: It is obtained by reacting with an electron acceptor 2,6-dibromoanthracene in the presence of a palladium catalyst, cuprous iodide and a base.

[0034] As a specific embodiment, the palladium catalyst can be tetrakis(triphenylphosphine)palladium and / or bis(triphenylphosphine)palladium chloride.

[0035] As a specific embodiment, the base is one or more of triethylamine, sodium carbonate, and potassium carbonate.

[0036] As a specific implementation manner, the reaction temperature is 70 to 90° C., and the reaction time is 24 to 48 hours.

[0037] As a specific implementation, the reaction atmosphere is an inert atmosphere. Specifically, the reaction atmosphere is a nitrogen atmosphere and / or an argon atmosphere.

[0038] As a specific implementation manner, the reaction is carried out in an organic solvent, and the organic solvent is one or more of dimethylacetamide, N-methylpyrrolidone, and dimethylformamide.

[0039] After the reaction, a post-treatment operation may be further included, and the post-treatment sequentially includes drying, grinding, ultrasonic dispersion, suction filtration and secondary drying steps.

[0040] Preferably, Depend on Obtained by reaction with tetrabutylammonium fluoride.

[0041] As a specific implementation manner, the reaction is carried out in an organic solvent, and the organic solvent is tetrahydrofuran.

[0042] As a specific implementation manner, the reaction temperature is 0 to 25° C., and the reaction time is 0.5 to 1 hour.

[0043] Preferably, Depend on Obtained by reaction with triisopropylsilyl acetylene.

[0044] The preparation method may comprise the following steps: It is obtained by reacting triisopropylsilyl acetylene in the presence of a palladium catalyst, cuprous iodide and a base.

[0045] As a specific embodiment, the palladium catalyst can be tetrakis(triphenylphosphine)palladium and / or bis(triphenylphosphine)palladium chloride.

[0046] As a specific implementation manner, the reaction temperature is 70 to 90° C., and the reaction time is 24 to 48 hours.

[0047] As a specific implementation, the reaction atmosphere is an inert atmosphere. Specifically, the reaction atmosphere is a nitrogen atmosphere and / or an argon atmosphere.

[0048] As a specific embodiment, the reaction is carried out in an organic solvent, and the organic solvent is piperidine. Piperidine is alkaline.

[0049] The present invention also protects the use of the electron donor-acceptor polymer in photocatalytic production of hydrogen peroxide.

[0050] The electron donor-acceptor polymer of the present invention can serve as active sites for oxygen reduction after the electron bridge and the electron acceptor obtain electrons, and can reduce oxygen to hydrogen peroxide with high selectivity.

[0051] The present invention also protects the use of the electron donor-acceptor polymer in photocatalytically producing hydrogen peroxide to reduce the generation of superoxide free radicals.

[0052] The inventors unexpectedly discovered that in the photocatalytic production of hydrogen peroxide, the electron donor acceptor polymer of the present invention can promote the generation of oxygen-centered organic free radicals (OCORs) and reduce superoxide free radicals (·O2 - ) is generated, thereby improving the cyclic stability of the obtained polymer for photocatalytic production of hydrogen peroxide.

[0053] Preferably, in the photocatalytic production of hydrogen peroxide, the structure represented by formula (II) has a more excellent cycle stability. This is because the electron donor acceptor polymer represented by formula (II) can reduce the generation of most superoxide radicals, effectively avoiding the attack of superoxide radicals on the catalyst itself, thereby improving the cycle stability.

[0054] The present invention also provides a method for photocatalytically producing hydrogen peroxide, comprising the following steps: adding any of the above-mentioned electron donor and acceptor polymers to water, and applying a light intensity of 100 mW / cm 2 , producing hydrogen peroxide.

[0055] Compared with the prior art, the present invention has the following beneficial effects:

[0056] The present invention provides a new electron donor acceptor polymer, which is a D-π-A type conjugated polymer, wherein an alkynyl group is used as an electron bridge to connect an electron donor unit and an electron acceptor unit, wherein the electron donor unit is an ethyl or sulfone group as a side chain modified benzene ring, and the electron acceptor unit is anthraquinone. The electron donor acceptor polymer promotes the generation of oxygen-centered organic free radicals while reducing the generation of superoxide free radicals by modifying a specific electron donor, thereby improving the cyclic stability of the obtained polymer for photocatalytic production of hydrogen peroxide.

[0057] When the electron donor-acceptor polymer of the present invention is used as a photocatalyst for preparing hydrogen peroxide, it can be reused 10 to 20 times in the photocatalytic production of hydrogen peroxide without significant performance degradation. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] Figure 1 is the NMR of the electron donor and acceptor polymer of Example 1 ( 13 C-NMR) spectrum.

[0059] Figure 2 is the NMR of compound 1 in the preparation method of electron donor and acceptor polymer in Example 2 ( 13 C-NMR) spectrum.

[0060] Figure 3 is the NMR of compound 2 in the preparation method of the electron donor acceptor polymer in Example 2 ( 13 C-NMR) spectrum.

[0061] Figure 4is the NMR of the electron donor and acceptor polymer of Example 2 ( 13 C-NMR) spectrum.

[0062] Figure 5 It is the diffuse reflectance infrared spectra of the electron donor acceptor polymer of Example 1, the electron donor acceptor polymer of Example 2 and the anthraquinone monomer.

[0063] Figure 6 These are the Raman spectra of the electron donor and acceptor polymers of Example 1 and Example 2.

[0064] Figure 7 1 and 2 are XRD diagrams of the electron donor and acceptor polymers of Example 1 and Example 2.

[0065] Figure 8 The figure is a characterization diagram of the oxygen-centered organic free radicals of the electron donor and acceptor polymers of Example 1 and Example 2.

[0066] In the figure: Ethyl-AQ is the electron donor acceptor polymer of Example 1.

[0067] Sulfonly-AQ is the electron donor acceptor polymer of Example 2.

[0068] AQ is 2,6-diethynylanthracene-9 10-dione. DETAILED DESCRIPTION

[0069] The present invention is further described in detail below in conjunction with specific examples, which are only used to explain the present invention and are not used to limit the scope of the present invention. The test methods used in the following examples are conventional methods unless otherwise specified; the materials and reagents used are reagents and materials that can be obtained from commercial channels unless otherwise specified.

[0070] Example 1

[0071] The preparation method of the electron donor acceptor polymer is as follows:

[0072]

[0073] The preparation method comprises the following steps:

[0074] Under argon atmosphere, 35 mg of 3,5-dibromoethylbenzene and 50 mg of 2,6-diethynylanthracene-9 10-dione (AQ) were added to 50 ml of DMF. Bis(triphenylphosphine)palladium chloride (13 mg), CuI (3.71 mg) and triethylamine (50 mL) were added to the solution. The reaction mixture was stirred at 80 ° C for 48 hours. After cooling, it was ultrasonicated in DMF for 30 minutes, then centrifuged, ultrasonically washed with ethanol 3 times, filtered and vacuum dried at 60 ° C to obtain an electron donor acceptor polymer, recorded as Ethyl-AQ. For details of the NMR, see Figure 1 .

[0075] A method for photocatalytically producing hydrogen peroxide comprises the following steps: adding 1 mg of the electron donor-acceptor polymer to 50 mL of pure water, ultrasonically dispersing for 30 min, stirring and irradiating with a xenon lamp, with the light intensity controlled at 100 mW / cm 2 .

[0076] Example 2

[0077] The preparation method of the electron donor acceptor polymer is as follows:

[0078]

[0079] Synthesis route of compound 1:

[0080] 1,3-Dibromo-5-((methylsulfonyl)methyl)benzene (1.058 g, 3.2 mmol), triisopropylsilyl acetylene (1.411 g, 8.1 mmol), bistriphenylphosphine palladium dichloride (22 mg, 0.3 mmol) and cuprous iodide (61 mg, 0.32 mmol) were dissolved in piperidine (100 ml). The temperature was raised to 70 ° C under argon protection and maintained for 24 h. The temperature was lowered to room temperature and then dried by rotation. 1.54 g of light yellow solid was obtained by dichloromethane column chromatography with a yield of 95%. 1H NMR (400MHz, DMSO-d6) δ7.55 (d, J = 4Hz, 2H), 7.50 (t, J = 4Hz, 1H), 4.56 (s, 2H), 2.95 (s, 3H), 1.10 (42H). 13C NMR (101MHz, DMSO-d6) δ134.98, 134.41, 131.13, 123.52, 105.77, 92.08, 58.42, 18.95, 11.13, see NMR for details Figure 2 .

[0081] Synthesis route of compound 2:

[0082] Compound 1 (2.09 g, 4 mmol) was dissolved in tetrahydrofuran (50 ml), and tetrabutylammonium fluoride (5.14 g, 19.6 mmol) was added dropwise in an ice bath. The mixture was reacted for half an hour, dried by rotary evaporation, and subjected to dichloromethane column chromatography to obtain 0.85 g of a yellow solid with a yield of 93%. 1 H NMR (400MHz, DMSO-d6) δ7.58 (t, J = 4Hz, 1H), 7.55 (d, J = 4Hz, 2H), 4.53 (s, 2H), 4.35 (s, 2H), 2.93 (s, 3H). 13 C NMR (101MHz, DMSO-d6)δ134.95,134.75,131.11,123.00,82.70,82.35,55.65. For details of NMR, see Figure 3 .

[0083] Preparation of electron donor and acceptor polymers, the reaction formula is as follows:

[0084]

[0085] Compound 2 (64 mg) and 2,6-dibromoanthraquinone (50 mg) were dissolved in 50 mL of dimethylformamide (DMF) under an argon atmosphere. Bis(triphenylphosphine)palladium chloride (13 mg), cuprous iodide (3.71 mg), and triethylamine (50 mL) were added to the solution. The reaction mixture was stirred at 80°C for 48 hours. After cooling, it was ultrasonicated in DMF for 30 minutes, then centrifuged, ultrasonically washed with ethanol 3 times, filtered and vacuum dried at 60°C to obtain an electron donor-acceptor polymer, which was recorded as Sulfonyl-AQ. For details of the NMR, see Figure 4 .

[0086] A method for photocatalytically producing hydrogen peroxide comprises the following steps: adding 1 mg of the electron donor acceptor polymer to 50 mL of pure water, ultrasonically dispersing for 30 min, stirring and irradiating with a xenon lamp, with the light intensity controlled at 100 mW / cm 2 .

[0087] Comparative Example 1

[0088] An electron donor-acceptor polymer, the structural formula is as follows:

[0089]

[0090] 1 mg of the above electron acceptor polymer was added to 50 mL of pure water, ultrasonically dispersed for 30 min, stirred and illuminated with a xenon lamp with the light intensity controlled at 100 mW / cm 2 .

[0091] Performance Testing

[0092] The electron donor acceptor polymer of Example 1, Compound 1, Compound 2 and the electron donor acceptor polymer in Example 2 were tested by solid-state nuclear magnetic resonance spectrometer, and the electron donor acceptor polymer of Example 1 and the electron donor acceptor polymer of Example 2 were tested by infrared spectrometer, Raman spectrometer and X-ray powder diffractometer, respectively. The test results are as follows:

[0093] Figure 1 is the NMR of the electron donor and acceptor polymer of Example 1 ( 13 C-NMR) spectroscopy.

[0094] Figure 2 is the NMR of compound 1 in the preparation method of electron donor and acceptor polymer in Example 2 ( 13 C-NMR) spectroscopy.

[0095] Figure 3 is the NMR of compound 2 in the preparation method of the electron donor acceptor polymer in Example 2 ( 13 C-NMR) spectroscopy.

[0096] Figure 4 is the NMR of the electron donor and acceptor polymer of Example 2 ( 13 C-NMR) spectrum.

[0097] Figure 5 It is the diffuse reflectance infrared (FT-IR) spectra of the electron donor acceptor polymer of Example 1, the electron donor acceptor polymer of Example 2 and the anthraquinone monomer.

[0098] Figure 6 These are the Raman spectra of the electron donor and acceptor polymers of Example 1 and Example 2.

[0099] Figure 7 1 and 2 are XRD diagrams of the electron donor and acceptor polymers of Example 1 and Example 2.

[0100] from Figure 1 and Figure 4 It can be seen that in the solid state 13 C NMR ( 13 In the C-NMR spectrum, chemical shifts of different carbon environments are detected. Specifically, the spectrum shows a significant signal at a value of ≈180ppm, which belongs to the ketone carbon, the signal in the range of 120-140ppm indicates the presence of aromatic carbon, and the signal at ≈90ppm belongs to the alkyne carbon. In addition, for the electron donor acceptor polymer of Example 2, the signals of ≈59ppm and ≈40ppm are attributed to -CH2 and -CH3. In the electron donor acceptor polymer of Example 1, the signal peaks of -CH2 and -CH3 appear at around 28ppm and 15ppm, respectively.

[0101] The characteristic signals of the alkyne groups in the electron donor and acceptor polymers of Example 1 and Example 2 are obtained by solid state analysis. 13 C NMR ( 13 C-NMR) spectrum, FT-IR spectrum and Raman spectrum. Specifically, 13 The 90.88 ppm signal of C-NMR ( Figure 1 , Figure 4 ), ≈2210cm of FT-IR spectrum -1 Department Figure 5 ) and 2200cm of Raman spectrum -1 ( Figure 6 ).

[0102] also, 13 The ketone carbon signal peak (≈180 ppm) of C NMR spectrum ( Figure 1 , Figure 4 ), FT-IR spectrum at ~1670cm -1 The stretching signal peak of C=O at Figure 5 ). Example 2 The FTIR spectrum of the electron donor acceptor polymer (Sulfonyl-AQ) at 1120 cm -1 A signal was detected at , which was attributed to the stretching vibration peak of the sulfone (O=S=O) group ( Figure 5 ), confirming that the O=S=O unit was successfully introduced into the polymer ( Figure 5 ).

[0103] Figure 5 The anthraquinone monomer in the -1 The alkyne hydrogen stretching vibration peak appears at 2400 nm. It disappears in the polymer, indicating that the alkyne is successfully coupled to the electron donor and the electron acceptor.

[0104] Powder X-ray diffraction (PXRD) patterns revealed that all the photocatalysts exhibited the characteristics of amorphous carbon.

[0105] The successful polymerization of the two polymers of Example 1 and Example 2 was confirmed by the above analytical methods.

[0106] (2) Photocatalytic cycle stability test: 30 mg of the electron donor and acceptor polymers of Example 1, Example 2 and Comparative Example 1 were added to 50 mL of pure water, ultrasonically dispersed for 30 min, stirred and irradiated with a xenon lamp for 1 hour, and the light intensity was controlled at 100 mW / cm 2, realize the first cycle, then filter and dry. Then weigh 1 mg of the electron donor and acceptor polymers of Example 1, Example 2 and Comparative Example 1, add them to 50 mL of pure water, ultrasonically disperse for 30 minutes, stir and test the performance under xenon light for 1 hour to realize the second cycle. Repeat repeatedly until the alkynyl peak disappears in the FT-IR spectrum, indicating that the catalyst has been significantly degraded. The more cycles, the better the cycle stability.

[0107] The number of hydrogen peroxide cycles is shown in Table 1.

[0108] Table 1 Catalyst production of hydrogen peroxide cycle times (times)

[0109]

[0110]

[0111] As shown in Table 1, the electron donor acceptor polymer of Example 1 containing an ethyl group as a side group to modify a benzene ring as an electron donor can be cycled up to 20 times under the conditions of pure water, open air, no sacrificial agent and simulated sunlight, and has excellent cycle stability.

[0112] In Example 2, the electron donor-acceptor polymer with a sulfone group as a side chain to modify a benzene ring as an electron donor can also cycle up to 10 times under the same conditions.

[0113] Under the same conditions, the electron donor and acceptor polymer of Comparative Example 1 can be cycled only 3 times.

[0114] (3) Superoxide radicals (·O2) generated by the electron donor and acceptor polymers in the photocatalytic production of hydrogen peroxide in Examples 1 and 2 of the present invention - ) are shown in Table 2 below.

[0115] time 4min 8min 12min 16min Example 1 3.04 14.86 20.99 26.65 Example 2 31.33 59.44 70.90 87.75

[0116] Figure 8 The characterization diagrams are of oxygen-centered organic free radicals generated in the photocatalytic production of hydrogen peroxide by the electron donor and acceptor polymers of Example 1 and Example 2. The oxygen-centered organic free radicals were measured by electron paramagnetic resonance (EPR) (Bruker A300 spectrometer).

[0117] From Table 2 and Figure 8It can be seen that the electron donor acceptor polymer (Ethyl-AQ) in Example 1 using ethyl as a side group to modify the benzene ring as an electron donor is compared with the electron donor acceptor polymer (Sulfonyl-AQ) in Example 2 using sulfone as a side chain to modify the benzene ring as an electron donor. In the photocatalytic production of hydrogen peroxide, the amount of oxygen-centered organic free radicals in the electron donor acceptor polymer of Example 1 is greatly increased, while the amount of superoxide free radicals is greatly reduced. It can be seen that the electron donor acceptor polymer of Example 1 avoids the attack of superoxide free radicals on itself, increases the path for the oxygen-centered organic free radicals to generate hydrogen peroxide with oxygen, and thus increases the stability of the photocatalytic production of hydrogen peroxide.

[0118] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An electron donor acceptor polymer, characterized in that It has the structure shown in the following formula (I): in, is an electron donor unit; is the electron acceptor unit; For electronic bridge; The electron donor unit is of formula (a-1) or (a-2): The electron acceptor unit is of formula (b): The electronic bridge is p represents the site of connection to the electron acceptor unit, m represents the site of connection to the electron donor unit, and J and K represent the sites of connection to the electron bridge.

2. The electron donor-acceptor polymer according to claim 1, characterized in that: It has the structure shown in the following formula (II):

3. The electron donor-acceptor polymer according to claim 1, characterized in that: It has the structure shown in the following formula (III):

4. The method for preparing the electron donor acceptor polymer according to claim 2, characterized in that: The method comprises the following steps: reacting an electron donor 3,5-dibromoethylbenzene and Obtained by polymerization reaction.

5. The method for preparing the electron donor-acceptor polymer according to claim 3, characterized in that: The following steps are included: It is obtained by polymerization reaction with electron acceptor 2,6-dibromoanthraquinone.

6. The method for preparing the electron donor acceptor polymer according to claim 5, characterized in that: Depend on Obtained by reaction with tetrabutylammonium fluoride.

7. The method for preparing the electron donor acceptor polymer according to claim 6, characterized in that: Depend on Obtained by reaction with triisopropylsilyl acetylene.

8. Use of the electron donor-acceptor polymer according to claim 1 in photocatalytic production of hydrogen peroxide.

9. Use of the electron donor-acceptor polymer according to claim 1 in photocatalytic production of hydrogen peroxide to reduce the generation of superoxide radicals.

10. A method for photocatalytically producing hydrogen peroxide, characterized in that: The method comprises the following steps: adding the electron donor acceptor polymer according to claim 1 into water, and the light intensity is 100 mW / cm 2 , producing hydrogen peroxide.

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