CN115814836B - High-performance purple phosphazene/boron nitride aerogel composite photocatalytic material and preparation method and application thereof - Google Patents
High-performance purple phosphazene/boron nitride aerogel composite photocatalytic material and preparation method and application thereof Download PDFInfo
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- 230000001699 photocatalysis Effects 0.000 title claims abstract description 157
- 229910052582 BN Inorganic materials 0.000 title claims abstract description 148
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 title claims abstract description 148
- 239000004964 aerogel Substances 0.000 title claims abstract description 137
- GKTNLYAAZKKMTQ-UHFFFAOYSA-N n-[bis(dimethylamino)phosphinimyl]-n-methylmethanamine Chemical compound CN(C)P(=N)(N(C)C)N(C)C GKTNLYAAZKKMTQ-UHFFFAOYSA-N 0.000 title claims abstract description 123
- 239000000463 material Substances 0.000 title claims abstract description 111
- 239000002131 composite material Substances 0.000 title claims abstract description 107
- 238000002360 preparation method Methods 0.000 title claims abstract description 51
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 122
- 239000011574 phosphorus Substances 0.000 claims abstract description 122
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 100
- 238000000034 method Methods 0.000 claims abstract description 69
- 239000007791 liquid phase Substances 0.000 claims abstract description 41
- 238000005470 impregnation Methods 0.000 claims abstract description 26
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical group CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 35
- -1 phosphorus alkene Chemical class 0.000 claims description 27
- 238000000227 grinding Methods 0.000 claims description 19
- 239000002904 solvent Substances 0.000 claims description 18
- 239000002245 particle Substances 0.000 claims description 9
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 8
- 238000006243 chemical reaction Methods 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 4
- WUOACPNHFRMFPN-UHFFFAOYSA-N alpha-terpineol Chemical compound CC1=CCC(C(C)(C)O)CC1 WUOACPNHFRMFPN-UHFFFAOYSA-N 0.000 claims description 3
- SQIFACVGCPWBQZ-UHFFFAOYSA-N delta-terpineol Natural products CC(C)(O)C1CCC(=C)CC1 SQIFACVGCPWBQZ-UHFFFAOYSA-N 0.000 claims description 3
- 229940116411 terpineol Drugs 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 2
- 230000035484 reaction time Effects 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 85
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 abstract description 79
- 229910052739 hydrogen Inorganic materials 0.000 abstract description 79
- 239000001257 hydrogen Substances 0.000 abstract description 79
- XYFCBTPGUUZFHI-UHFFFAOYSA-N Phosphine Chemical compound P XYFCBTPGUUZFHI-UHFFFAOYSA-N 0.000 abstract description 71
- 239000005922 Phosphane Substances 0.000 abstract description 64
- 229910000064 phosphane Inorganic materials 0.000 abstract description 64
- 238000007146 photocatalysis Methods 0.000 abstract description 16
- 238000011161 development Methods 0.000 abstract description 11
- 230000008569 process Effects 0.000 abstract description 5
- 230000003197 catalytic effect Effects 0.000 abstract description 3
- 230000006798 recombination Effects 0.000 abstract description 3
- 238000005215 recombination Methods 0.000 abstract description 3
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 65
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 description 39
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 31
- 239000003795 chemical substances by application Substances 0.000 description 26
- 238000001291 vacuum drying Methods 0.000 description 26
- 239000011941 photocatalyst Substances 0.000 description 16
- 238000005070 sampling Methods 0.000 description 16
- 238000013329 compounding Methods 0.000 description 14
- 239000007789 gas Substances 0.000 description 14
- 239000002253 acid Substances 0.000 description 13
- 238000001816 cooling Methods 0.000 description 13
- 238000001035 drying Methods 0.000 description 13
- 239000007788 liquid Substances 0.000 description 13
- 239000004570 mortar (masonry) Substances 0.000 description 13
- 238000011056 performance test Methods 0.000 description 13
- 229910052724 xenon Inorganic materials 0.000 description 13
- FHNFHKCVQCLJFQ-UHFFFAOYSA-N xenon atom Chemical compound [Xe] FHNFHKCVQCLJFQ-UHFFFAOYSA-N 0.000 description 13
- 239000010410 layer Substances 0.000 description 12
- 239000002356 single layer Substances 0.000 description 12
- 238000010586 diagram Methods 0.000 description 9
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- 239000003054 catalyst Substances 0.000 description 6
- 230000003287 optical effect Effects 0.000 description 6
- 238000001069 Raman spectroscopy Methods 0.000 description 5
- 238000009826 distribution Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 229910000073 phosphorus hydride Inorganic materials 0.000 description 3
- 150000004032 porphyrins Chemical class 0.000 description 3
- 238000000197 pyrolysis Methods 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- 238000001237 Raman spectrum Methods 0.000 description 1
- 229910052796 boron Inorganic materials 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
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- 238000005868 electrolysis reaction Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
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- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 239000012071 phase Substances 0.000 description 1
- 238000013032 photocatalytic reaction Methods 0.000 description 1
- 208000017983 photosensitivity disease Diseases 0.000 description 1
- 231100000434 photosensitization Toxicity 0.000 description 1
- 230000029553 photosynthesis Effects 0.000 description 1
- 238000010672 photosynthesis Methods 0.000 description 1
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
Abstract
The invention discloses a high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material and a preparation method and application thereof, belonging to the technical field of catalytic chemistry and nano science. Firstly, stripping and crushing large-size block purple phosphorus by adopting a liquid phase stripping method to prepare purple phosphazene, and secondly, compositing the purple phosphazene and boron nitride aerogel by adopting a one-step vacuum impregnation method to ensure that the two are tightly combined and ensure that the purple phosphazene is uniformly distributed. Compared with the phosphorus photocatalytic material, the high-performance ultraviolet phosphane/boron nitride aerogel composite photocatalytic material has higher stability and photocatalytic performance, lower electron-hole pair recombination and higher photocatalytic hydrogen production characteristic, plays an important role in the practical high-efficiency hydrogen production and hydrogen production application process of the phosphorus and phosphorus composite material, is beneficial to the practical application of photocatalysis, and provides theoretical basis and experience guidance for the novel development of the photocatalytic hydrogen production material and the preparation thereof.
Description
Technical Field
The invention belongs to the technical field of catalytic chemistry and nano science, and particularly relates to a high-performance ultraviolet phosphazene/boron nitride aerogel composite photocatalytic material, and a preparation method and application thereof.
Background
With the social development, the development of new clean energy is urgent because the progress of the human social development is strongly impacted under the double restrictions of the energy shortage and the environmental pollution, along with the strong environmental pollution at the same time of the gradual shortage of fossil energy. The advantages of high efficiency, cleanliness, environmental protection and high energy density of hydrogen energy are considered to be ideal clean energy sources in the future. The current main approach to hydrogen production is by electrolysis of water and fossil fuel cracking, and the high cost associated with these two approaches limits the development of the hydrogen production field. Inspired by photosynthesis in nature, a new idea is provided for preparing hydrogen energy at present: the photocatalyst is utilized to directly absorb solar energy to provide energy for dissociating water, the semiconductor photocatalyst can realize direct conversion from light energy to hydrogen energy, so that the cost consumption for producing hydrogen is greatly reduced, the requirements of sustainable development of economy and society are met, the photocatalyst has bright application prospect, and the interest of more and more researchers is also attracted.
At present, the development of the photocatalyst is mainly controlled by materialsThe photocatalyst cannot be directly applied due to the influence of the toxicity, and meanwhile, the development of the photocatalyst is generally still in the theoretical exploration and laboratory stage, so that a plurality of practical application problems are to be solved. Comprising the following steps: (1) the specific surface area of the catalyst is low; (2) weak response to visible light; (3) the charge recombination rate is high. Therefore, in view of the development of the novel green nontoxic sustainable photocatalyst material, the development of a semiconductor material with higher photocatalytic activity in the visible light range is a key to realizing solar hydrogen production. The purple phosphorus has a lamellar simple substance phosphorus structure and unique photocatalysis performance, and the hole mobility of the purple phosphorus is limited to 3000-7000 cm 2 V -1 s -1 The semiconductor is the most stable phosphorus allotrope known at present, is an adjustable indirect band gap semiconductor, has a band gap of about 1.42-2.54 eV, and has excellent performance, high stability and low preparation cost.
However, when the existing phosphorus-based material is used as a photocatalyst, the problems of difficult recovery, difficult separation of electron and hole, poor cycle performance, low stability and the like still exist, black phosphorus serving as a main phosphorus-based photocatalyst is easy to oxidize and degrade in the air before purple phosphorus is found, the photocatalytic performance of the black phosphorus is greatly reduced, and the discovery of the purple phosphorus can be improved. The existing purple phosphorus material is supplemented with the problems, and the technical problems which can be solved by the invention are also solved.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material as well as a preparation method and application thereof, so as to solve the technical problems of small specific surface area, difficult recovery, poor structural stability, poor circularity and low efficiency of the existing purple phosphazene material.
In order to achieve the above purpose, the invention is realized by adopting the following technical scheme:
the invention discloses a preparation method of a high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material, which comprises the following steps:
s1, grinding block purple phosphorus into small-size purple phosphorus, dispersing the small-size purple phosphorus in a solvent, and preparing purple phosphorus alkene by adopting a liquid phase stripping method;
s2, mixing the purple phosphazene prepared in the step S1 with boron nitride aerogel, and preparing the purple phosphazene/boron nitride aerogel composite photocatalytic material by adopting a vacuum impregnation method.
Optimally, in step S2, the mass ratio of the purple phosphazene to the boron nitride aerogel is 1:1.
optimally, in the step S2, the reaction temperature of the vacuum impregnation method is as follows: the reaction time is 6-8 h at 60-120 ℃ and the vacuum range is-25-0 MPa.
Optimally, in the step S2, the size of the boron nitride aerogel is 25-100 mm 2 。
Optimally, in the step S1, the particle size of the purple phosphazene is 5-15 mu m.
Optimally, in step S1, the block purple phosphorus is prepared by a chemical vapor transport method.
Optimally, in the step S1, the particle size of the small-size purple phosphorus is 20-50 mu m.
Optimally, in the step S1, the solvent is ethanol, glycol or terpineol.
The invention also discloses the high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material prepared by the preparation method.
The invention also discloses application of the high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material in preparation of a photocatalytic hydrogen production material.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a preparation method of a high-performance purple phosphane/boron nitride aerogel composite photocatalytic material, which comprises the steps of firstly crushing and stripping massive purple phosphane by adopting a liquid phase stripping method to prepare small-sized and large-specific-surface-area purple phosphane, increasing the specific surface area of the purple phosphane, enabling the contact area of the purple phosphane and water to be larger, thereby improving the photocatalytic performance of the purple phosphane, and then compositing the purple phosphane and boron nitride aerogel by adopting a vacuum impregnation method to prepare the purple phosphane/boron nitride aerogel composite photocatalytic material, wherein the boron nitride aerogel provides a three-dimensional skeleton for the purple phosphane, can stabilize a purple phosphane structure, can form a heterojunction with boron nitride, and reduces the composite rate of photo-generated charges, thereby better improving the photocatalytic hydrogen production performance of the purple phosphane. The method has the advantages that the structural framework of the boron nitride aerogel is reserved by adopting a vacuum impregnation method, the purple phosphazene is uniformly distributed on the boron nitride framework, the boron nitride aerogel framework provides effective help for stabilizing the structure of the purple phosphazene and for photocatalytic activity, the preparation method fully realizes the controllable preparation of the catalyst material, greatly improves the photocatalytic cracking water hydrogen production activity of the phosphorus material, fully improves the problems of low stability and poor photocatalytic cycle performance of the phosphorus material when the phosphorus material is used as a photocatalyst, and exerts the excellent semiconductor characteristic and stability of the purple phosphazene, so that the purple phosphazene is exerted in the field of photocatalysis as a semiconductor with adjustable band gap. In addition, no report on preparation of a purple phosphazene/boron nitride aerogel composite photocatalytic material and application of the purple phosphazene/boron nitride aerogel composite photocatalytic material in photocatalytic pyrolysis of water to produce hydrogen exists at present.
The invention also discloses the high-performance purple phosphane/boron nitride aerogel composite photocatalytic material prepared by the preparation method, which has the characteristics of high efficiency and cleanness, maintains the original boron nitride aerogel structure, can ensure that the purple phosphane is stably distributed on a three-dimensional framework, increases the reaction contact area in the photocatalytic reaction process, improves the photocatalytic hydrogen production efficiency of the purple phosphane, can provide a solution for high-efficiency improvement of the excellent decomposition rate of water molecules and the preparation of clean energy, and can be used as a photocatalyst in the development of the future hydrogen production industry.
The invention also discloses the application of the high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material in photocatalytic hydrogen production, the photocatalyst can keep the increasing trend within 10 hours, and the hydrogen production amount reaches 263.067 mu mol.g -1 ·h -1 。
Drawings
FIG. 1 is an optical microscopic view of the porphyrins produced in example 1 of the present invention, wherein (a) is a distribution diagram of the particle diameters of the porphyrins observed by an optical microscope, and (b) is a statistical result of the frequency of the particle diameters of the sample of the porphyrins under the optical microscope;
FIG. 2 is a Raman diagram of the purple phosphazene prepared in the embodiment 1 of the invention, wherein, (a) is a Raman diagram of small-sized purple phosphazene after grinding, and (b) is a Raman spectrum of purple phosphazene after liquid phase stripping;
FIG. 3 is a graph showing the photocatalytic hydrogen production performance of the ultraviolet phosphazene/boron nitride aerogel composite photocatalytic material prepared in example 1 of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
The invention is described in further detail below with reference to the attached drawing figures:
the invention provides a preparation method of a high-performance purple phosphane/boron nitride aerogel composite photocatalytic material, which comprises the steps of firstly adopting a liquid phase stripping method to strip and crush large-size block purple phosphane to prepare purple phosphane, and secondly compounding the purple phosphane and the boron nitride aerogel by a one-step vacuum impregnation method.
The invention discloses a preparation method of a high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material, which comprises the following steps:
s1, grinding the block purple phosphorus into small-size purple phosphorus in a mortar, dispersing different solvents, and preparing the purple phosphorus alkene by adopting a liquid phase stripping method.
Wherein, the block purple phosphorus is prepared by a chemical gas phase transportation method, and the size is 4-10 mm. And (3) adding a small amount of ethanol into the block purple phosphorus for grinding until the block purple phosphorus is matte, wherein the small-size purple phosphorus after grinding is 20-50 mu m. The different solvents include ethanol, ethylene glycol, or terpineol. The method for preparing the purple phosphazene by the liquid phase stripping method is liquid phase mechanical crushing, and an external mechanical microwave instrument with the power of 10-800W is adopted. The size of the purple phosphazene prepared by the final liquid phase stripping method is 5-15 mu m.
S2, preparing the purple phosphazene and boron nitride aerogel prepared in the step S1 into the purple phosphazene/boron nitride aerogel composite photocatalytic material by adopting a vacuum impregnation method.
Wherein, the content of the required purple phosphorus in the preparation of the purple phosphazene/boron nitride aerogel composite photocatalytic material is 1-10 mg, and the adopted boron nitride aerogel has the size of 25-100 mm 2 (wherein the mass ratio of the purple phosphazene to the boron nitride aerogel is 1:1). Compounding the ultraviolet phosphane and boron nitride aerogel by adopting a vacuum drying box, wherein the vacuum drying condition is set to be 60-120 ℃, the drying time is set to be 6-8 h, the vacuum range is set to be-25-0 Mpa, the prepared ultraviolet phosphane/boron nitride composite photocatalytic material is subjected to photocatalytic performance test by a gas chromatograph and hydrogen production equipment, sampling is carried out once every half hour, the sampling time is set to be 10min, the cooling circulation is controlled to be 5-6 ℃, the hydrogen production test time is set to be 10-12 h, the test light source is provided by a xenon lamp, and the rated voltage is set to be 100W and the wavelength range is 320-2500 nm. The formula of the hydrogen production test liquid used for the test is as follows: the ultraviolet phosphane/boron nitride composite photocatalytic material, 20-50 mL of water, 5-15 mL of methanol as a sacrificial agent and 1-5% of chloroplatinic acid as a cocatalyst, and the same amount of sacrificial agent needs to be repeatedly added during the photocatalytic performance cycle test.
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The invention discloses a preparation method of a high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material, which comprises the following steps:
1) Liquid phase stripping process for preparing purple phosphazene
Grinding the block purple phosphorus in a mortar to obtain small-size 50 mu m purple phosphorus, dispersing the small-size purple phosphorus in an ethanol solvent, and preparing the purple phosphorus alkene by a liquid phase stripping method through a water bath ultrasonic instrument with the power of 800W; the size of the obtained purple phosphazene is 13 mu m;
2) Preparation of purple phosphazene/boron nitride aerogel composite photocatalysis material by vacuum impregnation method
When the purple phosphane/boron nitride aerogel composite photocatalytic material is prepared, the required purple phosphane content is 1mg, and the adopted boron nitride aerogel has the size of 25mm 2 . And compounding the purple phosphazene and boron nitride aerogel by adopting a vacuum drying oven, wherein the vacuum drying condition is set to 120 ℃, the drying time is 8 hours, and the vacuum range is-25 Mpa. Prepared purple phosphazene/boron nitrideThe aerogel composite photocatalytic material is subjected to photocatalytic performance test through a gas chromatograph and hydrogen production equipment, sampling is carried out once every half hour, sampling time is 10min, cooling circulation is controlled at 6 ℃, hydrogen production test time is 10h, a test light source is provided by a xenon lamp, rated voltage is 100W, and wavelength range is 320-2500 nm. The formula of the hydrogen production test liquid used for the test is as follows: the ultraviolet phosphazene/boron nitride aerogel composite photocatalytic material, 20mL of water, 5mL of methanol as a sacrificial agent and 1% chloroplatinic acid as a cocatalyst, and the same amount of sacrificial agent needs to be repeatedly added during the photocatalytic performance cycle test.
Referring to FIG. 1, there is shown an optical microscopic view of the purple phosphazene obtained in the present example 1; wherein, (a) is a distribution diagram of the particle size of the ultraviolet phosphane observed by an optical microscope, the distribution is uniform after the ultraviolet phosphane liquid phase processing is seen from the diagram, and (b) is a statistical result of the particle size distribution frequency of ultraviolet phosphane samples under the optical microscope, and the ultraviolet phosphane size prepared by a liquid phase stripping method can be obtained from the diagram and is 13 mu m.
Referring to FIG. 2, there is shown a Raman diagram of the purple phosphazene prepared in example 1; wherein, (a) is a Raman diagram of small-size purple phosphorus after grinding, and (b) is a Raman diagram of purple phosphorus alkene after liquid phase stripping; from the comparison of the figures, it can be seen that the small-sized violet phosphorus is a small-layer or single-layer structure of the bulk violet phosphorus.
Referring to FIG. 3, a graph of the photocatalytic hydrogen production performance of the purple phosphazene/boron nitride aerogel composite photocatalytic material prepared in the present example 1 is shown; as can be seen from the figure, the photocatalytic hydrogen production results are: 263.067 mu mol g -1 ·h -1 The prepared purple phosphazene/boron nitride composite aerogel has excellent photocatalytic hydrogen production performance.
Example 2
The invention discloses a preparation method of a high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material, which comprises the following steps:
1) Liquid phase stripping process for preparing purple phosphazene
Grinding the block purple phosphorus in a mortar to obtain small-size 20 μm purple phosphorus, dispersing with ethanol solvent, preparing purple phosphorus alkene by liquid phase stripping method, the ultraviolet phosphine prepared by using the external water bath ultrasonic with the power of 800W has the size of 5 mu m, and the small-size ultraviolet phosphine is in a small-layer or single-layer structure of the block ultraviolet phosphine.
2) Preparation of purple phosphazene/boron nitride aerogel composite photocatalysis material by vacuum impregnation method
When the purple phosphane/boron nitride aerogel composite photocatalytic material is prepared, the required purple phosphane content is 10mg, and the adopted boron nitride aerogel has the size of 100mm 2 . And compounding the purple phosphazene and boron nitride aerogel by adopting a vacuum drying oven, wherein the vacuum drying condition is set to 60 ℃, the drying time is 8 hours, and the vacuum range is 0Mpa. The prepared ultraviolet phosphane/boron nitride aerogel composite photocatalytic material is subjected to photocatalytic performance test through a gas chromatograph and hydrogen production equipment, sampling is carried out every half hour for 10min, cooling circulation is controlled at 5 ℃, hydrogen production test time is 12h, a test light source is provided by a xenon lamp, rated voltage is 100W, and wavelength range is 320-2500 nm. The formula of the hydrogen production test liquid used for the test is as follows: the purple phosphazene/boron nitride composite photocatalytic material, 50mL of water, 15mL of methanol as a sacrificial agent and 5% of chloroplatinic acid as a cocatalyst, the same amount of sacrificial agent needs to be repeatedly added during the photocatalytic performance cycle test, so that the photocatalytic hydrogen production performance is high.
Example 3
The invention discloses a preparation method of a high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material, which comprises the following steps:
1) Liquid phase stripping process for preparing purple phosphazene
The block purple phosphorus is put into a mortar for grinding to obtain small-size 50 mu m purple phosphorus, the small-size purple phosphorus is dispersed by an ethanol solvent, then the liquid phase stripping method is adopted to prepare the purple phosphorus alkene, an ultrasonic cell disruption instrument with power of 800W is adopted to prepare the small-size purple phosphorus alkene with the size of 5 mu m, and the small-size purple phosphorus is in a small-layer or single-layer structure of the block purple phosphorus.
2) Preparation of purple phosphazene/boron nitride aerogel composite photocatalysis material by vacuum impregnation method
When the purple phosphane/boron nitride aerogel composite photocatalytic material is prepared, the required purple phosphane content is 1mg, and the adopted boron nitride aerogel has the size of 25mm 2 . And compounding the purple phosphazene and boron nitride aerogel by adopting a vacuum drying oven, wherein the vacuum drying condition is set to 60 ℃, the drying time is 6 hours, and the vacuum range is-20 Mpa. Prepared purpleThe phosphazene/boron nitride aerogel composite photocatalytic material is subjected to photocatalytic performance test through a gas chromatograph and hydrogen production equipment, sampling is carried out once every half hour, sampling time is 10min, cooling circulation is controlled at 6 ℃, hydrogen production test time is 10h, a test light source is provided by a xenon lamp, rated voltage is 100W, and wavelength range is 320-2500 nm. The formula of the hydrogen production test liquid used for the test is as follows: the purple phosphazene/boron nitride composite photocatalytic material, 20mL of water, 5mL of methanol as a sacrificial agent and 1% of chloroplatinic acid as a cocatalyst, the same amount of sacrificial agent needs to be repeatedly added during the photocatalytic performance cycle test, so that the photocatalytic hydrogen production performance is high.
Example 4
The invention discloses a preparation method of a high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material, which comprises the following steps:
1) Liquid phase stripping process for preparing purple phosphazene
The block purple phosphorus is put into a mortar for grinding to obtain small-size 20 mu m purple phosphorus, the small-size purple phosphorus is dispersed by an ethanol solvent, then the liquid phase stripping method is adopted to prepare the purple phosphorus alkene, the prepared purple phosphorus alkene has the size of 10 mu m by adopting water bath ultrasonic with the power of 800W, and the small-size purple phosphorus is in a small-layer or single-layer structure of the block purple phosphorus.
2) Preparation of purple phosphazene/boron nitride aerogel composite photocatalysis material by vacuum impregnation method
When the purple phosphane/boron nitride aerogel composite photocatalytic material is prepared, the required purple phosphane content is 5mg, and the adopted boron nitride aerogel has the size of 50mm 2 . And compounding the purple phosphazene and boron nitride aerogel by adopting a vacuum drying oven, wherein the vacuum drying condition is set to 60 ℃, the drying time is 6 hours, and the vacuum range is-15 Mpa. The prepared ultraviolet phosphane/boron nitride aerogel composite photocatalytic material is subjected to photocatalytic performance test through a gas chromatograph and hydrogen production equipment, sampling is carried out every half hour for 10min, cooling circulation is controlled at 6 ℃, hydrogen production test time is 12h, a test light source is provided by a xenon lamp, rated voltage is 100W, and wavelength range is 320-2500 nm. The formula of the hydrogen production test liquid used for the test is as follows: during the cyclic test of the photocatalytic performance, the ultraviolet phosphazene/boron nitride aerogel composite photocatalytic material, 20mL of water, 5mL of methanol as a sacrificial agent and 1% chloroplatinic acid as a promoterThe sacrificial agent with the same dosage needs to be repeatedly added, and the high photocatalytic hydrogen production performance is achieved.
Example 5
The invention discloses a preparation method of a high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material, which comprises the following steps:
1) Liquid phase stripping process for preparing purple phosphazene
The block purple phosphorus is put into a mortar for grinding to obtain small-size 25 mu m purple phosphorus, the small-size purple phosphorus is dispersed by an ethanol solvent, then the liquid phase stripping method is adopted to prepare the purple phosphorus alkene, the prepared purple phosphorus alkene has the size of 15 mu m by adopting water bath ultrasonic with the power of 10W, and the small-size purple phosphorus is in a small-layer or single-layer structure of the block purple phosphorus.
2) Preparation of purple phosphazene/boron nitride aerogel composite photocatalysis material by vacuum impregnation method
When the purple phosphane/boron nitride aerogel composite photocatalytic material is prepared, the required purple phosphane content is 5mg, and the adopted boron nitride aerogel has the size of 25mm 2 . And compounding the purple phosphazene and boron nitride aerogel by adopting a vacuum drying oven, wherein the vacuum drying condition is set to 80 ℃, the drying time is 6 hours, and the vacuum range is-25 Mpa. The prepared ultraviolet phosphane/boron nitride aerogel composite photocatalytic material is subjected to photocatalytic performance test through a gas chromatograph and hydrogen production equipment, sampling is carried out every half hour for 10min, cooling circulation is controlled at 6 ℃, hydrogen production test time is 11h, a test light source is provided by a xenon lamp, rated voltage is 100W, and wavelength range is 320-2500 nm. The formula of the hydrogen production test liquid used for the test is as follows: the ultraviolet phosphane/boron nitride aerogel composite photocatalytic material, 20mL of water, 5mL of methanol as a sacrificial agent and 3% of chloroplatinic acid as a cocatalyst, and the same amount of sacrificial agent needs to be repeatedly added during the photocatalytic performance cycle test, so that the ultraviolet light-induced hydrogen production performance is high.
Example 6
The invention discloses a preparation method of a high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material, which comprises the following steps:
1) Liquid phase stripping process for preparing purple phosphazene
The block purple phosphorus is put into a mortar for grinding to obtain small-size 25 mu m purple phosphorus, the small-size purple phosphorus is dispersed by an ethanol solvent, then the liquid phase stripping method is adopted to prepare the purple phosphorus alkene, the prepared purple phosphorus alkene has the size of 12 mu m by adopting water bath ultrasonic with the power of 100W, and the small-size purple phosphorus is in a small-layer or single-layer structure of the block purple phosphorus.
2) Preparation of purple phosphazene/boron nitride aerogel composite photocatalysis material by vacuum impregnation method
When the purple phosphane/boron nitride aerogel composite photocatalytic material is prepared, the required purple phosphane content is 1mg, and the adopted boron nitride aerogel has the size of 25mm 2 . And compounding the purple phosphazene and boron nitride aerogel by adopting a vacuum drying oven, wherein the vacuum drying condition is set to 120 ℃, the drying time is 6 hours, and the vacuum range is-20 Mpa. The prepared ultraviolet phosphane/boron nitride aerogel composite photocatalytic material is subjected to photocatalytic performance test through a gas chromatograph and hydrogen production equipment, sampling is carried out every half hour for 10min, cooling circulation is controlled at 6 ℃, hydrogen production test time is 11h, a test light source is provided by a xenon lamp, rated voltage is 100W, and wavelength range is 320-2500 nm. The formula of the hydrogen production test liquid used for the test is as follows: the purple phosphazene/boron nitride composite photocatalytic material, 20mL of water, 5mL of methanol as a sacrificial agent and 3% of chloroplatinic acid as a cocatalyst, the same amount of sacrificial agent needs to be repeatedly added during the photocatalytic performance cycle test, so that the photocatalytic hydrogen production performance is high.
Example 7
The invention discloses a preparation method of a high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material, which comprises the following steps:
1) Liquid phase stripping process for preparing purple phosphazene
Grinding the block purple phosphorus in a mortar to obtain small-size 20 μm purple phosphorus, dispersing with ethanol solvent, preparing purple phosphorus alkene by liquid phase stripping method, the water bath ultrasonic with the power of 500W is selected, the size of the prepared purple phosphazene is 9 mu m, and the small-size purple phosphorus is a small-layer or single-layer structure of the block purple phosphorus.
2) Preparation of purple phosphazene/boron nitride aerogel composite photocatalysis material by vacuum impregnation method
When the purple phosphane/boron nitride aerogel composite photocatalytic material is prepared, the required purple phosphane content is 5mg, and the adopted boron nitride aerogel has the size of 100mm 2 . By vacuum drying ovenCompounding the purple phosphazene and boron nitride aerogel, setting the vacuum drying condition to 60 ℃, and setting the drying time to 6 hours, wherein the vacuum range is-20 Mpa. The prepared ultraviolet phosphane/boron nitride aerogel composite photocatalytic material is subjected to photocatalytic performance test through a gas chromatograph and hydrogen production equipment, sampling is carried out every half hour for 10min, cooling circulation is controlled at 6 ℃, hydrogen production test time is 10h, a test light source is provided by a xenon lamp, rated voltage is 100W, and wavelength range is 320-2500 nm. The formula of the hydrogen production test liquid used for the test is as follows: the ultraviolet phosphane/boron nitride aerogel composite photocatalytic material, 20mL of water, 10mL of methanol as a sacrificial agent and 3% of chloroplatinic acid as a cocatalyst, and the same amount of sacrificial agent needs to be repeatedly added during the photocatalytic performance cycle test, so that the ultraviolet light-induced hydrogen production performance is high.
Example 8
The invention discloses a preparation method of a high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material, which comprises the following steps:
1) Liquid phase stripping process for preparing purple phosphazene
The block purple phosphorus is put into a mortar for grinding to obtain small-size 25 mu m purple phosphorus, the small-size purple phosphorus is dispersed by an ethanol solvent, then the liquid phase stripping method is adopted to prepare the purple phosphorus alkene, the prepared purple phosphorus alkene has the size of 15 mu m by adopting water bath ultrasonic with the power of 100W, and the small-size purple phosphorus is in a small-layer or single-layer structure of the block purple phosphorus.
2) Preparation of purple phosphazene/boron nitride aerogel composite photocatalysis material by vacuum impregnation method
When the purple phosphane/boron nitride aerogel composite photocatalytic material is prepared, the required purple phosphane content is 3mg, and the adopted boron nitride aerogel has the size of 25mm 2 . And compounding the purple phosphazene and boron nitride aerogel by adopting a vacuum drying oven, wherein the vacuum drying condition is set to 80 ℃, the drying time is 7h, and the vacuum range is-20 Mpa. The prepared ultraviolet phosphane/boron nitride aerogel composite photocatalytic material is subjected to photocatalytic performance test through a gas chromatograph and hydrogen production equipment, sampling is carried out every half hour for 10min, cooling circulation is controlled at 6 ℃, hydrogen production test time is 12h, a test light source is provided by a xenon lamp, rated voltage is 100W, and wavelength range is 320-2500 nm. The formula of the hydrogen production test liquid used for the test is as follows: purple (purple)The phosphazene/boron nitride composite material, 40mL of water, 5mL of methanol as a sacrificial agent and 1% of chloroplatinic acid as a cocatalyst, and the same dosage of sacrificial agent is required to be repeatedly added during the photocatalytic performance cycle test, so that the high photocatalytic hydrogen production performance is realized.
Example 9
The invention discloses a preparation method of a high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material, which comprises the following steps:
1) Liquid phase stripping process for preparing purple phosphazene
The block purple phosphorus is put into a mortar for grinding to obtain small-size 50 mu m purple phosphorus, the small-size purple phosphorus is dispersed by an ethanol solvent, then the liquid phase stripping method is adopted to prepare the purple phosphorus alkene, the prepared purple phosphorus alkene has a size of 13 mu m by adopting water bath ultrasonic with power of 500W, and the small-size purple phosphorus is in a small-layer or single-layer structure of the block purple phosphorus.
2) Preparation of purple phosphazene/boron nitride aerogel composite photocatalysis material by vacuum impregnation method
When the purple phosphane/boron nitride aerogel composite photocatalytic material is prepared, the required purple phosphane content is 1mg, and the adopted boron nitride aerogel has the size of 25mm 2 . And compounding the purple phosphazene and boron nitride aerogel by adopting a vacuum drying oven, wherein the vacuum drying condition is set to 60 ℃, the drying time is 6 hours, and the vacuum range is-25 Mpa. The prepared ultraviolet phosphane/boron nitride aerogel composite photocatalytic material is subjected to photocatalytic performance test through a gas chromatograph and hydrogen production equipment, sampling is carried out once every half hour, sampling time is 10min, cooling circulation is controlled at 6 ℃, hydrogen production test time is 10h, a test light source is provided by a xenon lamp, rated voltage is 100W, and wavelength range is 320-2500 nm. The formula of the hydrogen production test liquid used for the test is as follows: the purple phosphazene/boron nitride composite photocatalytic material, 40mL of water, 5mL of methanol as a sacrificial agent and 1% of chloroplatinic acid as a cocatalyst, the same amount of sacrificial agent needs to be repeatedly added during the photocatalytic performance cycle test, so that the photocatalytic hydrogen production performance is high.
Example 10
The invention discloses a preparation method of a high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material, which comprises the following steps:
1) Liquid phase stripping process for preparing purple phosphazene
The block purple phosphorus is put into a mortar for grinding to obtain small-size 50 mu m purple phosphorus, the small-size purple phosphorus is dispersed by an ethanol solvent, then the liquid phase stripping method is adopted to prepare the purple phosphorus alkene, water bath ultrasonic with the power of 400W is adopted to prepare the small-size purple phosphorus alkene with the size of 13 mu m, and the small-size purple phosphorus is in a small-layer or single-layer structure of the block purple phosphorus.
2) Preparation of purple phosphazene/boron nitride aerogel composite photocatalysis material by vacuum impregnation method
When the purple phosphane/boron nitride aerogel composite photocatalytic material is prepared, the required purple phosphane content is 8mg, and the adopted boron nitride aerogel has the size of 75mm 2 . And compounding the purple phosphazene and boron nitride aerogel by adopting a vacuum drying oven, wherein the vacuum drying condition is set to 80 ℃, the drying time is 6 hours, and the vacuum range is-5 Mpa. The prepared ultraviolet phosphane/boron nitride aerogel composite photocatalytic material is subjected to photocatalytic performance test through a gas chromatograph and hydrogen production equipment, sampling is carried out every half hour for 10min, cooling circulation is controlled at 6 ℃, hydrogen production test time is 12h, a test light source is provided by a xenon lamp, rated voltage is 100W, and wavelength range is 320-2500 nm. The formula of the hydrogen production test liquid used for the test is as follows: the purple phosphazene/boron nitride composite photocatalytic material, 20mL of water, 5mL of methanol as a sacrificial agent and 5% of chloroplatinic acid as a cocatalyst, the same amount of sacrificial agent needs to be repeatedly added during the photocatalytic performance cycle test, so that the photocatalytic hydrogen production performance is high.
Example 11
The invention discloses a preparation method of a high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material, which comprises the following steps:
1) Liquid phase stripping process for preparing purple phosphazene
The block purple phosphorus is put into a mortar for grinding to obtain small-size purple phosphorus with the size of 30 mu m, the small-size purple phosphorus is dispersed by an ethanol solvent, then the liquid phase stripping method is adopted to prepare the purple phosphorus alkene, water bath ultrasonic with the power of 800W is adopted to prepare the small-size purple phosphorus alkene with the size of 10 mu m, and the small-size purple phosphorus is in a small-layer or single-layer structure of the block purple phosphorus.
2) Preparation of purple phosphazene/boron nitride aerogel composite photocatalysis material by vacuum impregnation method
Preparation of purple phosphazene/boron nitride aerogel composite photocatalytic materialWhen the content of the required purple phosphazene is 5mg, the size of the adopted boron nitride aerogel is 25mm 2 . And compounding the purple phosphazene and boron nitride aerogel by adopting a vacuum drying oven, wherein the vacuum drying condition is set to 80 ℃, the drying time is 6 hours, and the vacuum range is-15 Mpa. The prepared ultraviolet phosphane/boron nitride aerogel composite photocatalytic material is subjected to photocatalytic performance test through a gas chromatograph and hydrogen production equipment, sampling is carried out every half hour for 10min, cooling circulation is controlled at 6 ℃, hydrogen production test time is 12h, a test light source is provided by a xenon lamp, rated voltage is 100W, and wavelength range is 320-2500 nm. The formula of the hydrogen production test liquid used for the test is as follows: the purple phosphazene/boron nitride composite photocatalytic material, 20mL of water, 5mL of methanol as a sacrificial agent and 1% of chloroplatinic acid as a cocatalyst, the same amount of sacrificial agent needs to be repeatedly added during the photocatalytic performance cycle test, so that the photocatalytic hydrogen production performance is high.
Example 12
The invention discloses a preparation method of a high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material, which comprises the following steps:
1) Liquid phase stripping process for preparing purple phosphazene
The block purple phosphorus is put into a mortar for grinding to obtain small-size 40 mu m purple phosphorus, the small-size purple phosphorus is dispersed by an ethanol solvent, then the liquid phase stripping method is adopted to prepare the purple phosphorus alkene, the prepared purple phosphorus alkene has the size of 15 mu m by adopting water bath ultrasonic with the power of 100W, and the small-size purple phosphorus is in a small-layer or single-layer structure of the block purple phosphorus.
2) Preparation of purple phosphazene/boron nitride aerogel composite photocatalysis material by vacuum impregnation method
When the purple phosphane/boron nitride aerogel composite photocatalytic material is prepared, the required purple phosphane content is 1mg, and the adopted boron nitride aerogel has the size of 25mm 2 . And compounding the purple phosphazene and boron nitride aerogel by adopting a vacuum drying oven, wherein the vacuum drying condition is set to 60 ℃, the drying time is 6 hours, and the vacuum range is-20 Mpa. The prepared ultraviolet phosphane/boron nitride aerogel composite photocatalytic material is subjected to photocatalytic performance test by a gas chromatograph and hydrogen production equipment, is sampled every half hour for 10min, is controlled at 5 ℃ in cooling circulation, and has hydrogen production test time of 12h, and a test light source is a xenon lampThe rated voltage is 100W, and the wavelength range is 320-2500 nm. The formula of the hydrogen production test liquid used for the test is as follows: the ultraviolet phosphane/boron nitride composite material, 20mL of water, 5mL of methanol as a sacrificial agent and 1% of chloroplatinic acid as a cocatalyst, and the same amount of sacrificial agent needs to be repeatedly added during the photocatalytic performance cycle test, so that the ultraviolet light hydrogen production performance is high.
The 12 embodiments adopt different liquid phase stripping powers and particle size diameters of the purple phosphorus raw materials, and different vacuum impregnation method compounding conditions are controlled and changed to prepare the purple phosphorus alkene/boron nitride aerogel photocatalyst composite material with high photocatalytic performance.
In summary, the patent provides a preparation method of a high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material, firstly, a liquid phase stripping method is adopted to strip and crush large-size block purple phosphorus to prepare purple phosphazene, secondly, the purple phosphazene and the boron nitride aerogel are compounded by a one-step vacuum impregnation method, the composite material prepared by the method fully plays the advantages of excellent photoelectric property and high stability of the purple phosphazene, the photocatalytic hydrogen production property is greatly improved, and the preparation method plays an important role in the practical high-efficiency hydrogen production and hydrogen production application process of phosphorus and phosphorus composite materials. The method for preparing the ultraviolet phosphane by stripping the ultraviolet phosphorus from the liquid phase and preparing the ultraviolet phosphane/boron nitride aerogel composite photocatalyst material by vacuum impregnation fully exerts the excellent semiconductor characteristic and stability of the ultraviolet phosphorus, so that the ultraviolet phosphorus is exerted in the photocatalysis field as a semiconductor with an adjustable band gap.
Research shows that the photocatalytic activity of the photocatalyst can be effectively improved through morphology regulation, doping, photosensitization, heterojunction construction and other modes. The invention firstly prepares the purple phosphazene with large specific surface area by utilizing a liquid phase stripping method. Secondly, boron nitride aerogel is selected as a three-dimensional framework, and the ultraviolet phosphane/boron nitride composite aerogel material is prepared through a one-step vacuum impregnation method, so that the ultraviolet phosphane catalytic activity is stabilized, a heterojunction is successfully constructed, the recombination rate of photo-generated charges is reduced, and the overall photolytic water hydrogen production activity of the material is improved. Meanwhile, through research in the literature, no report on the preparation of the purple phosphazene/boron nitride composite aerogel catalyst and the application of the purple phosphazene/boron nitride composite aerogel catalyst in photocatalytic pyrolysis of aquatic hydrogen exists at present. Therefore, the purple phosphorus is used as a catalyst main body for the first time, the boron nitride aerogel framework is used as an auxiliary, and the purple phosphorus alkene/boron nitride composite aerogel photocatalyst is successfully prepared by a one-step vacuum impregnation method, so that the controllable preparation of the catalyst material is realized, and the hydrogen production activity of photocatalytic pyrolysis of phosphorus materials is greatly improved.
The above is only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited by this, and any modification made on the basis of the technical scheme according to the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (10)
1. The preparation method of the high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material is characterized by comprising the following steps of:
s1, grinding block purple phosphorus into small-size purple phosphorus, dispersing the small-size purple phosphorus in a solvent, and preparing purple phosphorus alkene by adopting a liquid phase stripping method;
s2, mixing the purple phosphazene prepared in the step S1 with boron nitride aerogel, and preparing the purple phosphazene/boron nitride aerogel composite photocatalytic material by adopting a vacuum impregnation method.
2. The method for preparing the high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material according to claim 1, wherein in the step S2, the mass ratio of purple phosphazene to boron nitride aerogel is 1:1.
3. the method for preparing a high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material according to claim 1, wherein in step S2, the reaction temperature of the vacuum impregnation method is as follows: the reaction time is 6-8 h at 60-120 ℃ and the vacuum range is-25-0 MPa.
4. The method for preparing high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material according to claim 1, characterized in that in step S2, the size of the boron nitride aerogel is 25-100 mm 2 。
5. The method for preparing a high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material according to claim 1, wherein in the step S1, the particle size of purple phosphazene is 5-15 μm.
6. The method for preparing a high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material according to claim 1, wherein in step S1, the bulk purple phosphorus is prepared by a chemical vapor transport method.
7. The method for preparing a high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material according to claim 1, wherein in step S1, the particle size of the small-sized purple phosphazene is 20-50 μm.
8. The method for preparing a high-performance purple phosphazene/boron nitride aerogel composite photocatalytic material according to claim 1, wherein in the step S1, the solvent is ethanol, ethylene glycol or terpineol.
9. A high performance purple phosphazene/boron nitride aerogel composite photocatalytic material prepared by the preparation method of any one of claims 1 to 8.
10. The use of the high performance purple phosphazene/boron nitride aerogel composite photocatalytic material of claim 9 in the preparation of a photocatalytic hydrogen-generating material.
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