A fully organic nano photosensitizer with high singlet oxygen generation activity and its preparation method and application

Abstract

The present invention relates to the field of photodynamic technology, and in particular to a fully organic nano photosensitizer with high singlet oxygen production activity, and its preparation method and application. 3-amino-1,2,4-triazole is mixed with tripolyphosphazene chloride, followed by thermal polymerization and copolymerization heat treatment to obtain P-C3N5; P-C3N5 is ultrasonically mixed with a 3,4,9,10-perylenetetracarboxylic acid diimide solution and water, and filtered after standing. The filter residue is washed and dried to obtain P-C3N5 / PDI; P-C3N5 / PDI is mixed with a nitric acid solution and heat-treated, and the obtained heat-treated product is washed and dried to obtain a dried product; the dried product is mixed with sodium hydroxide and water and then heat-treated to obtain a heat-treated product; the heat-treated product is centrifuged, and the obtained clear liquid is dialyzed to neutrality to obtain a fully organic nano photosensitizer. The fully organic nano photosensitizer material has good water dispersibility and can efficiently produce singlet oxygen under near-infrared light.

Description

Technical Field

[0001] The present invention relates to the field of photodynamic technology, and in particular to an all-organic nano photosensitizer with high singlet oxygen generating activity, a preparation method thereof, and applications thereof. Background Art

[0002] Graphitic carbon nitride (g-C3N5) is a metal-free photosensitizer. The skeleton characteristics of C3N5 describe and reveal its unique electronic structure and optical properties. Its unique skeleton characteristics give it a small band gap, high charge-hole separation efficiency, and a wide visible light absorption range. The high nitrogen atomic content can also promote electron transfer in C3N5. As a new type of semiconductor material, C3N5 has become a research hotspot due to its unique composition and structure, as well as its visible light dynamic activity. Compared with the more widely studied C3N4, C3N5 has a higher diffusion-limited current density and lower overpotential, resulting in better photodynamic performance. However, g-C3N5 can only absorb sunlight with a wavelength of less than 500nm, and its solar energy conversion efficiency is still less than ideal.

[0003] To further enhance the photodynamic conversion efficiency of g-C3N5, various modification methods, including structural manipulation, element doping, and semiconductor or carbon material composites, have been widely reported to increase reactive sites, enhance light absorption, and improve carrier separation / migration. However, most photosensitizers are insoluble in water and inert to living organisms. Furthermore, they exhibit low accumulation efficiency in tumors and low singlet oxygen production.

[0004] Therefore, there is an urgent need to develop a stable, low-cost and effective modification method to improve the photodynamic activity of g-C3N5, so that it can be soluble in water and efficiently produce singlet oxygen. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides an all-organic nano photosensitizer with high singlet oxygen generation activity, a preparation method and application thereof. The all-organic nano photosensitizer prepared by the preparation method provided by the present invention is not only soluble in water, but also can efficiently generate singlet oxygen.

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

[0007] The present invention provides a method for preparing an all-organic nano photosensitizer with high singlet oxygen generation activity, comprising the following steps:

[0008] 1) mixing 3-amino-1,2,4-triazole and tripolyphosphazene chloride and sequentially performing thermal polymerization and copolymerization heat treatment to obtain P-C3N5;

[0009] 2) ultrasonically mixing the P-C3N5 obtained in step 1) with a 3,4,9,10-perylenetetracarboxylic acid diimide solution and water, allowing the mixture to stand and then filtering, washing and drying the filter residue to obtain P-C3N5 / PDI;

[0010] 3) mixing the P-C3N5 / PDI obtained in step 2) with a nitric acid solution, heat-treating the mixture, washing and drying the heat-treated mixture to obtain a dried mixture;

[0011] 4) mixing the dried product obtained in step 3) with sodium hydroxide and water and then heating the mixture to obtain a heat-treated product;

[0012] 5) Centrifuging the heat-treated product obtained in step 4), and dialyzing the resulting clear liquid to neutrality to obtain a fully organic nano photosensitizer.

[0013] Preferably, in step 1), the mass ratio of 3-amino-1,2,4-triazole to tripolyphosphazene chloride is 2:0.12.

[0014] Preferably, the conditions of the thermal polymerization reaction in step 1) include: temperature of 500° C., time of 4 h, and heating rate of 5° C. / min;

[0015] The conditions of the copolymerization heat treatment include: temperature of 550° C., time of 4 hours, and heating rate of 5° C. / min.

[0016] Preferably, in step 2), the volume ratio of the mass of P-C3N5 to the volume of the 3,4,9,10-perylenetetracarboxylic acid diimide solution and water is 0.6 g:10 mL:100 mL;

[0017] The solvent of the 3,4,9,10-perylenetetracarboxylic acid diimide solution is concentrated sulfuric acid, and the mass ratio of the concentrated sulfuric acid volume to 3,4,9,10-perylenetetracarboxylic acid diimide is 10 mL:0.1 g;

[0018] The ultrasonic mixing time is 10 minutes and the power is 150W;

[0019] The standing time is 0.5h;

[0020] The pore size of the membrane used in the filtration is 0.45 μm;

[0021] The drying conditions include: temperature of 80° C. and time of 4 hours.

[0022] Preferably, in step 3), the volume ratio of the mass of P-C3N5 / PDI to the nitric acid solution is 1.5 g:25 mL;

[0023] The concentration of the nitric acid solution is 10 mol / L;

[0024] The heat treatment conditions include: temperature of 90° C. and time of 2 h.

[0025] Preferably, the mass ratio of the dried product to sodium hydroxide and water in step 4) is 0.18:1.8:60;

[0026] The conditions of the heating treatment include: temperature of 180° C. and time of 3 hours.

[0027] Preferably, the centrifugal conditions in step 5) include: a rotation speed of 8000 rpm and a time of 5 min;

[0028] The molecular weight cut-off of the dialysis bag used in the dialysis is 0.5KD.

[0029] The present invention also provides an all-organic nano photosensitizer prepared by the preparation method described in the above technical solution.

[0030] The present invention also provides the use of the all-organic nano photosensitizer described in the above technical solution in producing singlet oxygen.

[0031] Preferably, the method comprises the following steps:

[0032] The all-organic nano photosensitizer is mixed with a 1,3-diphenylisobenzofuran solution and reacted under near-infrared laser irradiation;

[0033] The volume ratio of the mass of the all-organic nano photosensitizer to the 1,3-diphenylisobenzofuran solution is 10 mg:2 mL;

[0034] The concentration of the 1,3-diphenylisobenzofuran solution is 1 mg / L;

[0035] The reaction time is more than 2 minutes.

[0036] The mechanism of the present invention for efficiently generating singlet oxygen is:

[0037] P element is doped into the aromatic heterocyclic structure of C3N5 to reduce its energy band. PDI is a rigid conjugated structure. Through acid hydrolysis and heating, PDI is recrystallized on C3N5 to form a heterojunction, establishing an internal electric field, further reducing its energy band, inhibiting the recombination of photogenerated carriers in the reaction process, improving the electron mobility in the reaction process, and expanding the light absorption capacity and range of the material of the present invention. Under the excitation of light, the molecules of the material of the present invention can easily change from the ground state to the singlet excited state, and then change to the triplet excited state through intersystem crossing, reacting with the surrounding O2 molecules to produce 1 O2.

[0038] Beneficial effects of the present invention:

[0039] The all-organic nanophotosensitizer material with high singlet oxygen production activity prepared by this invention exhibits a broad visible light absorption range, greater visible light harvesting capacity, and good water dispersibility, significantly improving visible light utilization. Experiments have demonstrated that this photosensitizer material can efficiently generate singlet oxygen under near-infrared light and exhibits a good photothermal effect, showing promising development prospects in cancer treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments are briefly introduced below.

[0041] Figure 1 TEM image of a water-soluble phosphorus-doped graphite-phase carbon nitride-based and perylene diimide all-organic nano-photosensitizer material (P-C3N5 / PDI) with high singlet oxygen generation activity prepared in Example 2 of the present invention;

[0042] Figure 2 This is a DLS graph of a water-soluble phosphorus-doped graphite-phase carbon nitride-based and perylene diimide all-organic nano-photosensitizer material (P-C3N5 / PDI) with high singlet oxygen generation activity prepared in Example 2 of the present invention;

[0043] Figure 3 is the UV absorption spectrum of different photosensitizers;

[0044] Figure 4 is the fluorescence spectra of different photosensitizers;

[0045] Figure 5 This is a singlet oxygen performance test graph (λ=660nm) of a phosphorus-doped graphite carbon nitride-based and perylene diimide all-organic nano-photosensitizer material (6-P-C3N5 / PDI) with high singlet oxygen generation activity prepared in Example 1 of the present invention;

[0046] Figure 6 This is a singlet oxygen performance test graph (λ=808nm) of a phosphorus-doped graphite carbon nitride-based and perylene diimide all-organic nano-photosensitizer material (6-P-C3N5 / PDI) with high singlet oxygen generation activity prepared in Example 1 of the present invention;

[0047] Figure 7 This is a photothermal performance diagram (λ=660nm and 808nm) of a phosphorus-doped graphite-phase carbon nitride-based and perylene diimide all-organic nano-photosensitizer material (6-P-C3N5 / PDI) with high singlet oxygen generation activity prepared in Example 1 of the present invention;

[0048] Figure 8This is a singlet oxygen performance test graph (λ=660nm) of a water-soluble phosphorus-doped graphite carbon nitride-based and perylene diimide all-organic nano-photosensitizer material (6-P-C3N5 / PDI) with high singlet oxygen generation activity prepared in Example 2 of the present invention;

[0049] Figure 9 This is a singlet oxygen performance test graph (λ=808nm) of a water-soluble phosphorus-doped graphite carbon nitride-based and perylene diimide all-organic nano-photosensitizer material (6-P-C3N5 / PDI) with high singlet oxygen generation activity prepared in Example 2 of the present invention;

[0050] Figure 10 This is a photothermal performance diagram (λ=808nm) of a water-soluble phosphorus-doped graphite phase carbon nitride-based and perylene diimide all-organic nano photosensitizer material (6-P-C3N5 / PDI) with high singlet oxygen generation activity prepared in Example 2 of the present invention. DETAILED DESCRIPTION

[0051] The present invention provides a method for preparing an all-organic nano photosensitizer with high singlet oxygen generation activity, comprising the following steps:

[0052] 1) mixing 3-amino-1,2,4-triazole and tripolyphosphazene chloride and sequentially performing thermal polymerization and copolymerization heat treatment to obtain P-C3N5;

[0053] 2) ultrasonically mixing the P-C3N5 obtained in step 1) with a 3,4,9,10-perylenetetracarboxylic acid diimide solution and water, allowing the mixture to stand and then filtering, washing and drying the filter residue to obtain P-C3N5 / PDI;

[0054] 3) mixing the P-C3N5 / PDI obtained in step 2) with a nitric acid solution, heat-treating the mixture, washing and drying the heat-treated mixture to obtain a dried mixture;

[0055] 4) mixing the dried product obtained in step 3) with sodium hydroxide and water and then heating the mixture to obtain a heat-treated product;

[0056] 5) Centrifuging the heat-treated product obtained in step 4), and dialyzing the resulting clear liquid to neutrality to obtain a fully organic nano photosensitizer.

[0057] 3-amino-1,2,4-triazole and tripolyphosphazene chloride are mixed and then subjected to thermal polymerization reaction and copolymerization heat treatment in sequence to obtain P-C3N5.

[0058] In the present invention, the mass ratio of 3-amino-1,2,4-triazole to tripolyphosphazene chloride is preferably 2:0.12. In the present invention, the conditions for the thermal polymerization reaction preferably include: a temperature of 500°C, a time of 4 hours, and a heating rate of 5°C / min. In the present invention, the conditions for the copolymerization heat treatment preferably include: a temperature of 550°C, a time of 4 hours, and a heating rate of 5°C / min.

[0059] The method comprises the following steps: ultrasonically mixing the obtained P-C3N5 with a 3,4,9,10-perylenetetracarboxylic diimide solution and water, allowing the mixture to stand and then filtering; and washing and drying the filter residue to obtain P-C3N5 / PDI.

[0060] In the present invention, the ratio of the mass of P-C3N5 to the volume of the 3,4,9,10-perylenetetracarboxylic diimide solution and the volume of water is preferably 0.6g:10mL:100mL. In the present invention, the solvent of the 3,4,9,10-perylenetetracarboxylic diimide solution is preferably concentrated sulfuric acid, and the ratio of the volume of concentrated sulfuric acid to the mass of 3,4,9,10-perylenetetracarboxylic diimide is preferably 10mL:0.1g. In the present invention, the ultrasonic mixing time is preferably 10 minutes, and the power is preferably 150W. In the present invention, the standing time is preferably 0.5 hours. In the present invention, the pore size of the membrane used for filtration is preferably 0.45μm. In the present invention, the drying conditions preferably include: a temperature of 80°C and a drying time of 4 hours.

[0061] The present invention mixes the obtained P-C3N5 / PDI with a nitric acid solution, performs heat treatment, washes and dries the obtained heat-treated product, and obtains a dried product.

[0062] In the present invention, the mass ratio of the P-C3N5 / PDI to the volume ratio of the nitric acid solution is 1.5 g:25 mL; the concentration of the nitric acid solution is preferably 10 mol / L. In the present invention, the heat treatment conditions preferably include: a temperature of 90° C. and a time of 2 h.

[0063] The present invention further comprises mixing the obtained dried product with sodium hydroxide and water and then heating the mixture to obtain a heat-treated product. In the present invention, the mass ratio of the dried product to the sodium hydroxide and water is 0.18:1.8:60. In the present invention, the heat treatment conditions preferably include a temperature of 180° C. and a time of 3 hours.

[0064] The present invention centrifuges the heat-treated product and dialyzes the resulting clear solution until neutral to obtain a fully organic nanophotosensitizer. In the present invention, the centrifugation conditions include a rotation speed of 8000 rpm and a time of 5 minutes. In the present invention, the dialysis bag used for the dialysis has a molecular weight cutoff of 0.5 kD.

[0065] The present invention also provides an all-organic nano photosensitizer prepared by the preparation method described in the above technical solution.

[0066] The present invention also provides the use of the all-organic nano photosensitizer described in the above technical solution in producing singlet oxygen.

[0067] In the present invention, the application preferably comprises the following steps:

[0068] The all-organic nano photosensitizer is mixed with a 1,3-diphenylisobenzofuran solution and reacted under near-infrared laser irradiation;

[0069] The volume ratio of the mass of the all-organic nano photosensitizer to the 1,3-diphenylisobenzofuran solution is 10 mg:2 mL;

[0070] The concentration of the 1,3-diphenylisobenzofuran solution is 1 mg / L;

[0071] The reaction time is more than 2 minutes.

[0072] In order to further illustrate the present invention, the present invention is described in detail below with reference to the embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0073] Example 1

[0074] (1) Phosphorus-doped C3N5 nanosheets are called P-C3N5. Take 5 alumina crucibles respectively, weigh 2g of 3-AT (3-amino-1,2,4-triazole, content 96%) and 0.12g of HCCP (trichlorophosphazene, content 98%) in a mortar using an analytical balance, mix thoroughly and grind. After grinding, the obtained precursor is vacuum dried and placed in crucibles. The crucibles are placed in a muffle furnace and the temperature program is set: thermal polymerization at 500℃ for 4h (heating rate of 5℃ / min). After the product is cooled naturally, it is ground again and placed in a muffle furnace for copolymerization heat treatment. The heating time is set to 4h, the heating rate is 5℃ / min, and the target temperature is 550℃. After the product is cooled naturally, the P-C3N5 sample is obtained.

[0075] (2) Weigh 0.1g of PDI (3,4,9,10-perylenetetracarboxylic diimide) and dissolve it in a beaker containing 10mL of concentrated sulfuric acid under ultrasonic treatment. Ultrasonicate the beaker for 10 minutes to fully dissolve it. Use an analytical balance to weigh 0.6g of P-C3N5 and add it to the beaker. Then add 100mL of deionized water to the beaker and continue ultrasonicating for 10 minutes. At this time, a solid insoluble precipitate will immediately appear in the beaker and stand for 0.5h. Then filter it through a 0.45μm membrane filter, collect the filtered solid, and wash it with deionized water several times. After washing, collect it and put it into a beaker. Place the beaker in a drying oven for drying at 80℃ and for 4h. After drying, P-C3N5 / PDI is obtained and marked as 6-P-C3N5PDI.

[0076] Comparative Example 1

[0077] The 0.6 g of P-C3N5 in step (2) of Example 1 was replaced with 0.2 g of P-C3N5, with other conditions remaining unchanged, and was labeled as 2-P-C3N5PDI.

[0078] Comparative Example 2

[0079] The 0.6 g of P-C3N5 in step (2) of Example 1 was replaced with 0.4 g of P-C3N5, with other conditions remaining unchanged, and was labeled as 4-P-C3N5PDI.

[0080] Comparative Example 3

[0081] The 0.6 g of P-C3N5 in step (2) of Example 1 was replaced with 0.8 g of P-C3N5, with other conditions remaining unchanged, and was labeled as 8-P-C3N5PDI.

[0082] Comparative Example 4

[0083] The 0.6 g of P-C3N5 in step (2) of Example 1 was replaced with 1.0 g of P-C3N5, with other conditions remaining unchanged, and was labeled as 10-P-C3N5PDI.

[0084] Example 2

[0085] (1) Phosphorus-doped C3N5 nanosheets are called P-C3N5. Take 5 alumina crucibles respectively, weigh 2g of 3-AT (3-amino-1,2,4-triazole, content 96%) and 0.12g of HCCP (trichlorophosphazene, content 98%) in a mortar using an analytical balance, mix thoroughly and grind. After grinding, the obtained precursor is vacuum dried and placed in crucibles. The crucibles are placed in a muffle furnace and the temperature program is set: thermal polymerization at 500℃ for 4h (heating rate of 5℃ / min). After the product is cooled naturally, it is ground again and placed in a muffle furnace for copolymerization heat treatment. The heating time is set to 4h, the heating rate is 5℃ / min, and the target temperature is 550℃. After the product is cooled naturally, the P-C3N5 sample is obtained.

[0086] (2) Weigh 0.1g of PDI (3,4,9,10-perylenetetracarboxylic diimide) and dissolve it in a beaker containing 10mL of concentrated sulfuric acid under ultrasonic treatment. Ultrasonicate the beaker for 10 minutes to fully dissolve it. Use an analytical balance to weigh 0.6g of P-C3N5 and add it to the beaker. Then add 100mL of deionized water to the beaker and continue ultrasonicating for 10 minutes. At this time, a solid insoluble precipitate will immediately appear in the beaker and stand for 0.5h. Then filter it through a 0.45μm membrane filter, collect the filtered solid, and wash it with deionized water several times. After washing, collect it and put it into a beaker. Place the beaker in a drying oven for drying at 80℃ and for 4h. After drying, block P-C3N5 / PDI is obtained.

[0087] (3) The P-C3N5 / PDI powder was ground in ethanol using a mortar for 10 minutes to make the powder finer, and then dried in air at 70°C to obtain fine P-C3N5 / PDI powder. 1.5 g of P-C3N5 / PDI powder was dispersed in a brown sealed bottle containing (10 mol / L, 25 mL) nitric acid solution and heated at 90°C for 2 hours. The acid-treated powder was washed several times with deionized water and then dried at 90°C. 0.18 g of the dried powder was mixed with 1.8 g of NaOH and 60 mL of water and stirred. The solution was then transferred to a 150 mL Teflon-lined stainless steel autoclave, and then heated to 180°C in an electric oven in the sealed autoclave and maintained for 3 hours. After cooling naturally to room temperature, the product was centrifuged at 8000 rpm for 5 minutes to remove oversized particles. The resulting supernatant was dialyzed in a dialysis bag (molecular weight cut-off 0.5 kD) for two days and exchanged with deionized water until its pH was close to neutral, obtaining the final water-soluble P-C3N5 / PDI nanophotosensitizer material.

[0088] Figure 1This is a TEM image of a water-soluble phosphorus-doped graphite carbon nitride-based and perylene diimide all-organic nano-photosensitizer material (P-C3N5 / PDI) with high singlet oxygen generation activity obtained in Example 2 of the present invention. Figure 1 It can be seen that the synthesized water-soluble P-C3N5 / PDI nano-photosensitizer material has a size between 50nm and 110nm and an irregular flake structure.

[0089] Figure 2 This is a DLS graph of a water-soluble phosphorus-doped graphite carbon nitride-based and perylene diimide all-organic nano-photosensitizer material (P-C3N5 / PDI) with high singlet oxygen generation activity obtained in Example 2 of the present invention. Figure 2 It can be seen that the particle size of the water-soluble P-C3N5 / PDI nano-photosensitizer material synthesized in the experiment is mainly distributed between 87nm and 150nm, among which the particle size of 100nm to 125nm is the majority.

[0090] Figure 3 The UV absorption spectra of different photosensitizers are shown in Figure 2. Figure 3 The water-soluble P-C3N5 nanophotosensitizer exhibits a visible absorption edge near 250 nm, while the water-soluble PDI exhibits broad absorption in the 200-400 nm wavelength range. When P-C3N5 and PDI are hybridized, a significant absorption peak emerges between 250 and 370 nm, with two absorbance edges, indicating that the water-soluble P-C3N5 / PDI nanophotosensitizer possesses a broader visible light harvesting capability. The maximum absorption peak shifts toward the near-infrared region, significantly increasing its intensity. This phenomenon suggests that the interfacial interaction between PDI and P-C3N5 chemically bonds the heterostructures together.

[0091] Figure 4 Fluorescence spectra of different photosensitizers. Figure 4 The fluorescence spectra of the P-C3N5 / PDI nanophotosensitizer material under excitation of light of different wavelengths are shown in the figure. Under excitation of different wavelengths, the fluorescence spectrum peak is approximately fixed between 440nm and 500nm. The spectral shape is independent of the excitation wavelength. However, the fluorescence intensity of the water-soluble P-C3N5 / PDI photosensitizer is closely related to the wavelength of the excitation light, and the peak value varies with the change of the excitation wavelength. As can be seen from the figure, the P-C3N5 / PDI nanophotosensitizer has the strongest fluorescence emission under 320nm excitation, with the peak position at 452nm.

[0092] Combine Figure 1-4It can be seen that the water-soluble phosphorus-doped graphite phase carbon nitride-based and perylene diimide all-organic nano-photosensitizer material (P-C3N5 / PDI) with high singlet oxygen production activity prepared in the present invention has the advantages of small size, strong light absorption ability, good water dispersibility, and good photodynamic performance.

[0093] Example 3

[0094] The photodynamic activity of a phosphorus-doped graphitic carbon nitride-perylene diimide all-organic heterojunction photosensitizer with high singlet oxygen generation activity is studied, comprising the following steps:

[0095] Take the phosphorus-doped graphite phase carbon nitride-based and perylene diimide all-organic heterojunction photosensitizer (6-P-C3N5 / PDI) prepared in Embodiment 1 of the present invention, the photosensitizer (2-P-C3N5 / PDI) prepared in Comparative Example 1, the photosensitizer (4-P-C3N5 / PDI) prepared in Comparative Example 2, and the photosensitizer (8-P-C3N5 / PDI) prepared in Comparative Example 3, take 10 mg of each, add them to 2 mL of 1 mg / L 1,3-diphenylisobenzofuran (DPBF) solution, mix well, take samples, and measure their absorbance at 410 nm and time zero in an ultraviolet spectrophotometer. Subsequently, the mixture was stirred and reacted for 2.5 min under laser irradiation (λ = 660 nm and 808 nm, power of 0.2 W), and a sample was taken, transferred to a cuvette, and the absorbance at 2.5 min was measured using a UV spectrophotometer. Similarly, the absorbance was measured after stirring and reacting under laser for 5 min, 7.5 min, and 10 min, respectively.

[0096] Control group 1: acetonitrile was used to replace 6-P-C3N5 / PDI, and other conditions were the same.

[0097] Control group 2: C3N5 was used to replace 6-P-C3N5 / PDI, and other conditions were the same.

[0098] Control group 3: P-C3N5 was used to replace 6-P-C3N5 / PDI, and other conditions were the same.

[0099] The photothermal effect of a phosphorus-doped graphite carbon nitride-based and perylene diimide all-organic photosensitizer with high singlet oxygen generation activity is studied, comprising the following steps:

[0100] Take 10 mg of each of the phosphorus-doped graphite-phase carbon nitride-based and perylene diimide all-organic photosensitizers (6-P-C3N5 / PDI) with high singlet oxygen generation activity prepared in Embodiment 1 of the present invention, irradiate with near-infrared laser (λ=660 nm and 808 nm, power of 0.2 W) for 1 min, and record the temperature change every 10 s using an infrared thermal imager.

[0101] Figure 5This is a singlet oxygen performance test graph (λ=660nm) of a phosphorus-doped graphite carbon nitride-based and perylene diimide all-organic photosensitizer (6-P-C3N5 / PDI) with high singlet oxygen generation activity prepared in Example 1 of the present invention. Figure 5 As shown in (a), when the 660nm laser is used as the irradiation light source and the full spectrum of ultraviolet absorption is measured, the absorbance of the photosensitizer is maximum at 410nm, and the maximum absorption range is between 350nm and 450nm. Figure 5 (b) shows the intensity change of the UV-visible absorption light of DPBF at 410nm under the irradiation of 660nm laser with different photosensitizer materials. It is obvious from the C / C0 in the figure that after 10 minutes of reaction, the six photosensitizer materials prepared in the experiment all have the ability to produce singlet oxygen to a certain extent, and the absorbance has decreased to a certain extent. After the start of illumination, all six photosensitizers cause a certain degree of degradation of DPBF, showing an accelerating trend. The degree of decrease in absorbance of the 4-P-C3N5 / PDI group, the 6-P-C3N5 / PDI group and the 8-P-C3N5 / PDI group is almost 90%, which is much greater than the degree of decrease in absorbance of the other four control groups, resulting in 1 O2 is the most. Figure 5 As shown in (c), the degradation of DPBF follows the first-order reaction kinetic equation, and the fitting curve is a straight line, which shows that it is a first-order reaction. After fitting the curve, the degradation rate constant k value of DPBF when using different photosensitizers under 660nm laser is summarized in Figure 5 (d) It can be seen that under 660nm laser irradiation, 6-P-C3N5 / PDI photosensitizer produces 1 The rate constant k of O2 is 0.21681min -1 , which is significantly higher than other photosensitizers. It can be concluded that the 6-P-C3N5 / PDI photosensitizer synthesized in this experiment produces 1 O2 is more active.

[0102] Table 1 660nm Figure 5 Zhonga full spectrum detection data

[0103]

[0104]

[0105]

[0106] Table 2 660nm Figure 5 Medium (bd) data

[0107]

[0108]

[0109] Figure 6 This is a singlet oxygen performance test graph (λ=808nm) of a phosphorus-doped graphite carbon nitride-based perylene diimide all-organic heterojunction photosensitizer (6-P-C3N5 / PDI) with high singlet oxygen generation activity prepared in Example 1 of the present invention. Figure 6 As shown in (a), when the 808nm laser is used as the irradiation light source and the full spectrum of ultraviolet absorption is measured, the absorbance of the photosensitizer is maximum at 410nm, and the maximum absorption range is between 350nm and 450nm. Figure 6 (b) is a graph showing the intensity changes of the UV-visible absorption light of DPBF at 410nm under 808nm laser irradiation for the six photosensitizer materials. It is obvious from the C / C0 in the figure that after the reaction starts, the six nanophotosensitizers prepared in the experiment all have the ability to generate singlet oxygen to a certain extent. After 10 minutes of reaction, the absorbance of the 6-P-C3N5 / PDI group decreases the fastest, and the 1 O2 is the most. Figure 6 As shown in (c), the degradation of DPBF follows the first-order reaction kinetic equation, and the fitting curve is a straight line, which shows that it is a first-order reaction. After fitting the curve, the degradation rate constant k value of DPBF when using different photosensitizers under 808nm laser is summarized in Figure 6 (d) It can be seen that under 808nm laser irradiation, 6-P-C3N5 / PDI photosensitizer produces 1 The rate constant k of O2 is 0.07205min -1 , which is significantly higher than other photosensitizers. It can be concluded that the 6-P-C3N5 / PDI nano photosensitizer synthesized by the present invention produces 1 O2 is more active.

[0110] Table 3808nm Figure 6 China A Data

[0111]

[0112]

[0113]

[0114] Table 4808nm Figure 6 Medium (bd) data

[0115]

[0116] Figure 7 This is a photothermal effect diagram of a phosphorus-doped graphite carbon nitride-based and perylene diimide all-organic photosensitizer (6-P-C3N5 / PDI) with high singlet oxygen generation activity prepared in Example 1 of the present invention. Figure 7It can be seen that when the photothermal effect is measured using near-infrared laser (λ = 660nm and 808nm, power of 0.2W) as the irradiation light source, the photosensitizer (6-P-C3N5 / PDI) has a significant temperature increase effect within 1 minute. Under 660nm laser irradiation, the temperature of the photosensitizer (6-P-C3N5 / PDI) rises to 92.1°C within 1 minute. Under 808nm laser irradiation, the temperature of the photosensitizer (6-P-C3N5 / PDI) rises to 78.9°C within 1 minute. It can be concluded that the photosensitizer (6-P-C3N5 / PDI) has good photothermal capacity under near-infrared laser irradiation.

[0117] Example 4

[0118] The photodynamic activity of a water-soluble phosphorus-doped graphite carbon nitride-based and perylene diimide all-organic nano-photosensitizer material with high singlet oxygen generation activity is studied, comprising the following steps:

[0119] 10 mg of the water-soluble phosphorus-doped graphite-phase carbon nitride-based and perylene diimide all-organic nanophotosensitizer (P-C3N5 / PDI) prepared in Example 2 of the present invention was added to 2 mL of a 1 mg / L 1,3-diphenylisobenzofuran (DPBF) solution, mixed evenly, sampled, and the absorbance at 410 nm at time zero was measured in a UV spectrophotometer. Subsequently, the solution was stirred under laser (λ=660 nm and 808 nm, power of 0.2 W) for 2 min, sampled, transferred to a cuvette, and the absorbance at 2 min was measured in a UV spectrophotometer. Similarly, the absorbance after 4, 6, 8, and 10 min of stirring reaction under laser was measured.

[0120] Control group 1: Acetonitrile was used to replace water-soluble P-C3N5 / PDI, and other conditions were the same.

[0121] Control group 2: water-soluble C3N4 was used to replace water-soluble P-C3N5 / PDI, and other conditions were the same.

[0122] Control group three: water-soluble C3N5 was used to replace water-soluble P-C3N5 / PDI, and other conditions were the same.

[0123] Control group 4: water-soluble P-C3N5 was used to replace water-soluble P-C3N5 / PDI, and other conditions were the same.

[0124] Control group 5: water-soluble PDI was used to replace water-soluble P-C3N5 / PDI, and other conditions were the same.

[0125] The photothermal effect of a water-soluble phosphorus-doped graphite carbon nitride-based and perylene diimide all-organic nano-photosensitizer material with high singlet oxygen generation activity is studied, comprising the following steps:

[0126] Take 10 mg of the water-soluble phosphorus-doped graphite phase carbon nitride-based and perylene diimide all-organic nanophotosensitizer (P-C3N5 / PDI) prepared in Example 2 of the present invention, irradiate it with a near-infrared laser (λ=808 nm, power of 2 W) for 1 min, and record the temperature change every 10 s using an infrared thermal imager.

[0127] Figure 8 This is a singlet oxygen performance test chart (λ=660nm) of a water-soluble phosphorus-doped graphite carbon nitride-based and perylene diimide all-organic nano-photosensitizer (P-C3N5 / PDI) with high singlet oxygen generation activity prepared in Example 2 of the present invention. Figure 8 As shown in (a), when the 660nm laser is used as the irradiation light source and the full spectrum of ultraviolet absorption is measured, the absorbance of the photosensitizer is maximum at 410nm, and the maximum absorption range is between 400nm and 460nm. Figure 8 (b) is a graph showing the intensity change of the ultraviolet-visible absorption light of DPBF at 410nm under the irradiation of a 660nm laser with different photosensitizer materials. It is obvious from the C / C0 in the figure that after 10 minutes of reaction, the five photosensitizer materials prepared in the experiment all have the ability to produce singlet oxygen to a certain extent, and the absorbance has decreased to a certain extent. After the start of illumination, the five photosensitizers all caused a certain degree of degradation of DPBF, showing an accelerating trend, but after 2 minutes, the rates of the five groups slowed down, but the overall trend was still downward. After 10 minutes of illumination and stirring, the absorbance of the water-soluble P-C3N5 / PDI group decreased by 47%, which was much greater than the absorbance decrease of the other four control groups. It was the most produced among the five photosensitizers prepared in the experiment. 1 O2 has the best effect. Figure 8 As shown in (c), the degradation of DPBF follows the first-order reaction kinetic equation, and the fitting curve is a straight line, which shows that it is a first-order reaction. After fitting the curve, the degradation rate constant k value of DPBF when using different photosensitizers under 660nm laser is summarized in Figure 8 (d). It can be seen that under 660nm laser irradiation, the water-soluble P-C3N5 / PDI photosensitizer produces 1 The rate constant k of O2 is 0.05683min -1 , which is significantly higher than other photosensitizers. It can be concluded that the water-soluble P-C3N5 / PDI nanophotosensitizer synthesized in this experiment produces 1 O2 is more active.

[0128] Table 5660nm Figure 8 Zhonga full spectrum detection data

[0129]

[0130]

[0131]

[0132] Table 6660nm Figure 8 Medium (bd) data

[0133] X-axis DPBF <![CDATA[C3N4]]> <![CDATA[C3N5]]> <![CDATA[P-C3N5]]> PDI P-CN / PDI 0 1 1 1 1 1 1 2 1 0.9375 0.92577 0.93305 0.92224 0.81044 4 0.96051 0.88636 0.87255 0.85251 0.86999 0.73376 6 0.95159 0.83665 0.81933 0.78661 0.8068 0.67838 8 0.9465 0.78977 0.77451 0.72071 0.75699 0.60703 10 0.93121 0.75 0.72689 0.67469 0.69988 0.54526

[0134] Figure 9 This is a singlet oxygen performance test chart (λ=808nm) of a water-soluble phosphorus-doped graphite carbon nitride-based and perylene diimide all-organic nano-photosensitizer (P-C3N5 / PDI) with high singlet oxygen generation activity prepared in Example 2 of the present invention. Figure 9 As shown in (a), when the 808nm laser is used as the irradiation light source and the full spectrum of ultraviolet absorption is measured, the photosensitizer has the maximum absorbance at 425nm, and the maximum absorption range is between 410nm and 450nm. Figure 9 (b) is a graph showing the intensity changes of the ultraviolet-visible absorption light of DPBF at 410nm under 808nm laser irradiation for the five photosensitizer materials. It is obvious from the C / C0 in the figure that after 10 minutes of reaction, the five nanophotosensitizers prepared in the experiment all have a certain degree of ability to produce singlet oxygen. After the start of illumination, the absorbance of the water-soluble P-C3N5 / PDI nanophotosensitizer group decreased the fastest in the first two minutes. After irradiation with 808nm laser and stirring for 10 minutes, the absorbance of the water-soluble P-C3N5 / PDI group decreased by 28%. Compared with the absorbance reduction of the other four groups, the absorbance reduction of the water-soluble P-C3N5 / PDI group is better. Figure 9 As shown in (c), the degradation of DPBF follows the first-order reaction kinetic equation, and the fitting curve is a straight line, which shows that it is a first-order reaction. After fitting the curve, the degradation rate constant k value of DPBF when using different photosensitizers under 808nm laser is summarized in Figure 9 (d) It can be seen that under 808nm laser irradiation, the water-soluble P-C3N5 / PDI photosensitizer produces 1 The rate constant k of O2 is 0.00275min -1 , slightly lower than that of water-soluble P-C3N5 photosensitizer 1 The rate constant of O2 is shown in Table 1. It can be seen that the water-soluble P-C3N5 / PDI photosensitizer produces 1 O2 is more active.

[0135] Table 7808nm Figure 9Zhonga full spectrum detection data

[0136]

[0137]

[0138]

[0139] Table 8808nm Figure 9 Medium (bd) data

[0140] X-axis DPBF <![CDATA[C3N4]]> <![CDATA[C3N5]]> <![CDATA[P-C3N5]]> PDI P-CN / PDI 0 1 1 1 1 1 1 2 0.99899 0.9869 0.94237 0.90772 0.95965 0.8838 4 0.97588 0.95161 0.90822 0.83661 0.92456 0.83333 6 0.96382 0.9244 0.88154 0.77761 0.89211 0.79108 8 0.95075 0.89315 0.83885 0.7292 0.80702 0.74648 10 0.93568 0.85988 0.80256 0.68381 0.75088 0.71714

[0141] Figure 10 This is a photothermal effect diagram of a water-soluble phosphorus-doped graphite carbon nitride-based and perylene diimide all-organic photosensitizer (P-C3N5 / PDI) with high singlet oxygen generation activity prepared in Example 2 of the present invention. Figure 10 It can be seen that when the photothermal effect is measured using a near-infrared laser (λ = 808nm, power of 0.2W) as the irradiation light source, the photosensitizer (P-C3N5 / PDI) has a significant temperature increase within 1 minute. Under 808nm laser irradiation, the temperature of the photosensitizer (P-C3N5 / PDI) rises to 64.9°C within 1 minute. This shows that the photosensitizer (P-C3N5 / PDI) has good photothermal capacity under near-infrared laser irradiation.

[0142] In summary, the present invention demonstrates a highly active, all-organic nanophotosensitizer material with a broad visible light absorption range, enhanced visible light harvesting capacity, and excellent water dispersibility, significantly improving visible light utilization. Experiments have demonstrated that this photosensitizer material can efficiently generate singlet oxygen under near-infrared light and exhibits a favorable photothermal effect, suggesting promising development prospects in cancer treatment.

[0143] Although the above embodiment provides a detailed description of the present invention, it is only a part of the embodiments of the present invention, not all of the embodiments. People can also obtain other embodiments based on this embodiment without creativity, and these embodiments all fall within the scope of protection of the present invention.

Claims

1. A method for preparing an all-organic nano photosensitizer, characterized in that: The following steps are involved: 1) 3-amino-1,2,4-triazole and tripolyphosphazene chloride are mixed and then subjected to thermal polymerization and copolymerization heat treatment in sequence to obtain P-C3N5; 2) ultrasonically mixing the P-C3N5 obtained in step 1) with a 3,4,9,10-perylenetetracarboxylic acid diimide solution and water, allowing the mixture to stand and then filtering, washing and drying the filter residue to obtain P-C3N5 / PDI; 3) mixing the P-C3N5 / PDI obtained in step 2) with a nitric acid solution, heat-treating the mixture, and washing and drying the heat-treated product to obtain a dried product; 4) mixing the dried product obtained in step 3) with sodium hydroxide and water and then heating the mixture to obtain a heat-treated product; 5) Centrifuging the heat-treated product obtained in step 4), and dialyzing the resulting clear liquid to neutrality to obtain a fully organic nano photosensitizer.

2. The preparation method according to claim 1, characterized in that In the step 1), the mass ratio of 3-amino-1,2,4-triazole to tripolyphosphazene chloride is 2:0.

12.

3. The preparation method according to claim 1, characterized in that The conditions of the thermal polymerization reaction in step 1) include: temperature of 500° C., time of 4 hours, and heating rate of 5° C. / min; The conditions of the copolymerization heat treatment include: temperature of 550° C., time of 4 hours, and heating rate of 5° C. / min.

4. The preparation method according to claim 1, characterized in that In step 2), the volume ratio of the mass of P-C3N5 to the volume of the 3,4,9,10-perylenetetracarboxylic acid diimide solution and water is 0.6 g:10 mL:100 mL; The solvent of the 3,4,9,10-perylenetetracarboxylic acid diimide solution is concentrated sulfuric acid, and the mass ratio of the concentrated sulfuric acid volume to 3,4,9,10-perylenetetracarboxylic acid diimide is 10 mL:0.1 g; The ultrasonic mixing time is 10 minutes and the power is 150W; The standing time is 0.5h; The pore size of the membrane used in the filtration is 0.45 μm; The drying conditions include: temperature of 80° C. and time of 4 hours.

5. The preparation method according to claim 1, characterized in that In step 3), the volume ratio of the mass of P-C3N5 / PDI to the nitric acid solution is 1.5 g:25 mL; The concentration of the nitric acid solution is 10 mol / L; The heat treatment conditions include: temperature of 90° C. and time of 2 h.

6. The preparation method according to claim 1, characterized in that In step 4), the mass ratio of the dried product to sodium hydroxide and water is 0.18:1.8:60; The conditions of the heating treatment include: temperature of 180° C. and time of 3 hours.

7. The preparation method according to claim 1, characterized in that The centrifugal conditions in step 5) include: a rotation speed of 8000 rpm and a time of 5 min; The molecular weight cut-off of the dialysis bag used in the dialysis is 0.5KD.

8. The all-organic nano photosensitizer prepared by the preparation method according to any one of claims 1 to 7.

9. Use of the all-organic nano photosensitizer according to claim 8 in the preparation of a singlet oxygen generator.

10. The use according to claim 9, characterized in that The following steps are involved: The all-organic nano photosensitizer is mixed with a 1,3-diphenylisobenzofuran solution and reacted under near-infrared laser irradiation; The volume ratio of the mass of the all-organic nano photosensitizer to the 1,3-diphenylisobenzofuran solution is 10 mg:2 mL; The concentration of the 1,3-diphenylisobenzofuran solution is 1 mg / L; The reaction time is more than 2 minutes.

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